Some standard content:
Military Standard for Electronic Industry of the People's Republic of China FL5911
SJ20647-97
General Specification for Platinum Thermistors1997-06-17 Issued
1997.10-01 Implementation
Approved by the Ministry of Electronics Industry of the People's Republic of China Military Standard for Electronic Industry of the People's Republic of China General Specification for Platinum Thermistors1 Scope
1.1 Subject Content
This specification specifies the general requirements for platinum thermistors. 1.2 Scope of Application
This specification is applicable to platinum thermistors used for temperature control, temperature compensation and temperature control. 1.3 Classification
The platinum thermistors included in this specification are divided into three categories according to the different structures of the resistors. a. Platinum wire thermistor:
b. Platinum thick film thermistor;
e: Platinum thin film thermistor.
1.4 Definitions
The definitions used in this specification shall be in accordance with the provisions of GB4475-82 (Terms and Terms of Sensitive Components). 1.5 Model Naming
SJ 20647-97
The model naming method of platinum thermistors shall be in accordance with the provisions of SI155-82 "Model Naming Method of Sensitive Components". M BX
-Serial number
-Structural features
Category (positive temperature coefficient)
-Main name (sensitive element)
Note, BX-BS is platinum wire; BH is platinum floating film; BB is platinum film 2 Referenced documents
GB 191--90
Packaging, storage and transportation pictorial signs
The Ministry of Electronics Industry of the People's Republic of China issued on June 17, 1997 and implemented on October 1, 1997
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GB 447582
GJB 179—90
GJB 360.1—87
GJB 360.3—87
GJB360.7-87
GJB360.8—87
GJB 360.13—87
GJB 360.15-87
GJB 360.21--87
SJ20647—97
Terms of sensitive components
Counting sampling inspection procedures and tables
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Steady-state damp heat test
Temperature shock test
High temperature life test
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Low frequency vibration test
Test methods for electronic and electrical componentsHigh frequency vibration testTest methods for electronic and electrical componentsTerminal strength testGJB360.23-87Test methods for electronic and electrical componentsImpact (specified pulse) testGJB 360.28--87
SJ 1155—82
ZB Y 301—85
3 Requirements
3.1 Detailed Specifications
Test Methods for Electronic and Electrical Components Insulation Resistance Test Sensitive Component Model Naming Method
Technical Conditions and Graduation Tables for Industrial Platinum Thermistors The specific requirements of each product shall comply with the requirements of this specification and the corresponding detailed specifications. If the requirements of this specification conflict with the requirements of the detailed specifications, the detailed specifications shall prevail. 3.2 Qualified
Platinum thermistors submitted in accordance with this specification shall be products that have been qualified or approved for finalization. 3.3 Materials
Platinum thermistors shall use materials that enable the product to meet the performance requirements of this specification, and the requirements shall be specified in the detailed specifications. Key materials shall be supplied from designated sources.
3.4 Design and Structure
The design and structure of the product shall be specified by the detailed specifications. The product shall have a moisture-proof protective package. 3.5 Dimensions and Appearance
3.5.1 Dimensions
Shall comply with the requirements of the detailed specifications, and there shall be an appearance drawing. 3.5.2 Weight
Should meet the requirements of the detailed specifications.
3.5.3 Appearance quality
There should be no visible damage, and the lead wire should be free of creases and rust. 3.6 Performance characteristics
3.6.1 Temperature measurement range
In the range of -200 to 850 °C, the specific measurement range shall be specified in the detailed specifications. 3.6.2 Working current
3.6.2.1 Rated working current
Should be specified in the detailed specifications.
3.6.2.2 Allowable overload current
Should be specified in the detailed specifications.
3.6.3 Nominal resistance and its accuracy
SJ 20647—97
At 0°C, the preferred values of the nominal resistance at zero power are: 10.100, 500, 10000. The nominal resistance accuracy is: 0.1%, 0.5%, 1%. The specific nominal resistance and its accuracy are specified in the detailed specifications. 3.6.4 Resistance-Temperature Relationship
The relationship between the resistance and temperature of a platinum thermistor is nonlinear. The resistance-temperature relationship used in this specification is as follows: In the negative temperature zone (within the range of ~200～0℃): Rt= R.[1+ At+ Bt*+ C(t-100C)t21 In the positive temperature zone (within the range of 0～850℃);
R,= R.(1 + At + B12)
Where R is the resistance value of the platinum thermistor at temperature t, R is the torque value of the platinum thermistor at temperature 0, A is the temperature of the medium, and A, B, C are the related graduation constants, whose values are as follows: A =5.00802×10-3℃\1;
B = - 5.80195 ×10-7℃-3; C= - 4.27350 × 10-12 -4,
3.6.4.1 Temperature coefficient of resistance
For platinum thermistors that meet the above relationship and parameters, the temperature coefficient at 0℃ and 100C is: Riu-R.
100℃×R.
Where: R100
The resistance value of the platinum thermistor at a temperature of 100℃, 0. The temperature coefficient of resistance shall comply with the provisions of the detailed specifications. 3.6.4.2 Graduation value
The graduation value of the resistance-temperature relationship is shown in Appendix A (Platinum Thermistor Graduation Table). 3.6.4.3 Tolerance (when applicable)
The tolerance of platinum thermistors is shown in Table 1. The specific tolerance level and test point selection shall be specified in the detailed specifications. Table 1
Tolerances
± (0.15 + 0.002:21)
±(0.80 + 0.0051+1)
±(8.0+0.05/21)
Note: ① For platinum thermistors with R()=100.00n, the Class A tolerance does not apply to the temperature range of 1>650℃. ③ The Class A tolerance does not apply to platinum thermistors using a two-wire system. The resistance tolerance values of electromedical devices at different humidity levels are shown in Table 2. Table 2
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SI20647-97
Continued Table 2
3.6.5 Insulation resistance
Unless otherwise specified (see 3.1), when measured in accordance with 4.6.5, the insulation resistance shall comply with the following provisions: a. It shall not be less than 100Mn under standard atmospheric conditions; 5. It shall not be less than 10M2 under steady-state damp heat conditions; c. It shall not be less than 10Mm under 100-300℃; d. It shall not be less than 2MO under 301-500℃;
e. It shall not be less than 0.5MQ under 501-850℃. 3.6.6 Thermal response time
It shall comply with the requirements of the detailed specifications.
3.6.7 Self-heating effect (when applicable)
At 0℃ and specified conditions, the resistance value measured should not exceed 0.30t after conversion to glue temperature. 3.6.8 Repeatability error (when applicable)
Should meet the requirements of detailed specifications.
3.7 Environmental adaptability
3.7.1 Lead terminal strength
After testing according to 4.7.1, the appearance quality should meet the requirements of 3.5.3, the lead wire should not break, and the solder joint should not fall off. 3.7.2 Temperature shock
After testing according to 4.7.2, the appearance quality should meet the requirements of 3.5.3, and the resistance value change rate should not exceed the requirements of detailed specifications. 3.7.3 Low-frequency vibration
According to 4.7.3 After the test, the appearance quality shall meet the requirements of 3.5.3, and the resistance value change rate shall not be greater than the provisions of the detailed specifications. 3.7.4 High-frequency vibration (when applicable)
SJ 2064797
After the test according to 4.7.4, the appearance quality shall meet the requirements of 3.5.3, and the resistance value change rate shall not be greater than the provisions of the detailed specifications. 3.7.5 Impact (specified pulse)
After the test according to 4.7.5, the appearance quality shall meet the requirements of 3.5.3, and the resistance value change rate shall not be greater than the provisions of the detailed specifications. 3.7.6 Steady-state heat insulation
After the test according to 4.7.6, the appearance quality shall meet the requirements of 3.5.3, the insulation resistance shall meet the requirements of 3.6.5, and the resistance value change rate shall not be greater than the provisions of the detailed specifications.
3.7.7 High temperature life (when applicable)
After the test in accordance with 4.7.7, the appearance quality shall meet the requirements of 3.5.3, and the resistance value change rate shall not be greater than the provisions of the detailed specifications. 4 Quality Assurance Provisions
.4.1 Inspection Responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any inspection item specified in this specification. 4.1.1 Conformity
All products must meet all requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality outline. If the contract includes inspection requirements not specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency sampling does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products. 4.1.2. Inspection instruments and test equipment
The contractor shall establish and maintain inspection instruments and test equipment with sufficient accuracy, quality and quantity to carry out the required inspections. At the same time, a metrological confirmation system that complies with the regulations shall be established and maintained to control the accuracy of the inspection instruments and test equipment.
4.2 Inspection classification
The inspections specified in this specification are divided into:
a. Identification inspection;
b. Quality consistency inspection.
4.3 Inspection conditions
Unless otherwise specified, all tests shall be carried out under the standard atmospheric conditions specified in GJB360.1. 4.3.1 Standard atmospheric conditions for the test
Relative humidity
15-35C:
20% ~80%
Air pressure at the test site.
4.3.2 Standard atmospheric conditions for arbitration test
Relative humidity
4.4 Identification test
25±1℃;
48% ~ 52%;
86-106kPac
4.4.1 Identification test shall be carried out in any of the following cases: a. Finalization of product design or production;
b. Change of main structure or process method of product;5
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c. When the product is resumed after suspension for more than two years: d. Transfer of product production to another factory.
4.4.2 Identification test items
The identification test items and sequence shall be as specified in Table 3. SI 20647—97
Table 3 Identification inspection and quality consistency inspection
Inspection items
Dimensions
Appearance questions
Nominal resistance and its accuracy
Resistance temperature coefficient
Insulation resistance
Thermal response time
Self-heating influence
Resistance error
Terminal strengthWww.bzxZ.net
Temperature shock
Low frequency vibration
High frequency vibration
Shock (specified shock)
Steady-state virtual heat
High overflow life
Requirement clause
Note: ①“\V\” indicates the items to be inspected: Method clause
Identification inspection
Quality consistency inspection||tt| |Low frequency vibration and high vibration tests can be fully assessed or one of them can be selected according to specific needs. 4.4.3 Sampling
Group C and Group D
Fixed sampling inspection is generally adopted. The product samples used for identification inspection should be produced by commonly used equipment. The number of product samples should be no less than 20.
4.4.4 Qualification criteria
When the samples submitted for identification inspection are qualified according to the inspection items specified in Table 3, a conclusion of qualified identification should be made and a certification document should be issued.
4.4.5 Failure criteria
If any of the above-mentioned samples cannot meet the specified requirements, the identification inspection should be judged to be unqualified. 4.5 Quality consistency inspection
Quality consistency inspection is divided into four groups: A, B, C, and D. Among them, Group A and Group B are batch inspections, and Group C and Group D are periodic inspections.
4.5.1 Inspection batch
SJ 20647—97
An inspection batch shall consist of all products of the same model produced under basically the same conditions and submitted for inspection at the same time. 4.5.2 Group A inspection
The inspection items and sequence shall be as specified in Table 3. Group A inspection is a 100% inspection for each batch, and unqualified products shall be excluded. The rejection rate shall not exceed 20%.
4.5.3 Group B inspection
4.5.3.1 Inspection items
The inspection items and sequence of Group B shall be as specified in Table 3. 4.5.3.2 Sampling
Group B inspection shall be conducted by batch counting sampling inspection. The sampling plan shall comply with GJB 179. The acceptance quality level (AQL) shall not exceed 2.5% when a normal inspection sampling plan of general inspection level II is adopted. The samples for group B inspection shall be products that have passed the group A inspection.
4.5.3.3 Qualification judgment
After the inspection, if the number of unqualified products is not greater than the acceptance judgment number specified in the manual sampling inspection plan, the group B inspection of the product batch is judged to be qualified. Otherwise, the batch is judged to be unqualified.
4.5.3.4 Unqualified
The rejection of unqualified batches, the handling of unqualified products, the resubmission of inspection batches and the adjustment of sampling inspection shall be carried out in accordance with the provisions of Chapter 2 and 3.7, 3.8 and 3.9 of GJB179. For the same inspection batch, if two consecutive resubmissions fail to meet the inspection standards, the acceptance of the batch of products shall be stopped. The contractor shall find out the reasons and take corrective measures. Acceptance can be resumed only after the appraisal agency confirms that the corrective measures are effective. 4.5.4 Group C Inspection
4.5.4.1 Inspection Items
The inspection items and sequence of Group C shall be as specified in Table 3. 4.5.4.2 Sampling
Group C inspection adopts periodic fixed sample number sampling inspection. For continuous batch production, Group C inspection shall be carried out every 6 months. The number of product samples shall not be less than , which shall be specified in the detailed specifications. The samples for Group C inspection shall be taken from the batches that have passed the Group A and Group B inspections.
4.5.4.3 Qualification Judgment
If the inspection items of all samples of Group C inspection meet the requirements, the Group C inspection shall be judged to be qualified. Otherwise, it shall be judged to be unqualified. 4.5.4.4 Unqualified
If the product fails the Group C inspection, the acceptance and delivery of the product shall be stopped, and the unqualified situation shall be notified to the appraisal agency and the ordering party. The contractor shall take effective measures and re-conduct the Group C inspection after the existing problems are indeed solved. Whether to re-inspect all the items of Group C or only the inspection items that failed shall be proposed by the contractor and the appraisal agency shall make the final decision.
If the re-inspection still fails, the batch of products shall be rejected and the acceptance of future products shall be stopped. The contractor shall find out the reasons and take effective measures to make the newly submitted inspection batch pass the Group C inspection. 4.5.4.5 Treatment of Group C inspection samples
Samples that have passed the Group C inspection shall not be delivered as formal products. 4.5.5 Group D inspection
4.5.5.1 Inspection items
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The D-level inspection items and sequence shall be as specified in Table 3. 4.5.5.2 Sampling
SJ 20647--97
Group D inspection adopts periodic fixed sample number sampling inspection. For continuous batch production, Group D inspection shall be carried out every two years. The number of product samples shall be no less than 7, which shall be specified in the detailed specifications. Samples for Group D inspection shall be drawn from the batches that have passed Group AB inspection.
4.5.5.3 Qualification judgment
After the inspection, if the inspection items of all samples meet the requirements, the Group D inspection is judged to be qualified. Otherwise, it is judged to be unqualified. 4.5.5.4 Unqualified
If the product fails the Group D inspection, the acceptance and delivery of the product shall be stopped, and the contractor shall notify the appraisal agency and the ordering party of the unqualified situation, find out the reasons, and take corrective measures. After the appraisal agency confirms that the corrective measures are effective, the Group D inspection shall be repeated until it passes the Group D inspection. 4.5.5.5 Handling of Group D Inspection Samples
Samples that have been inspected by Group D shall not be delivered as formal products. 4.6 Inspection Methods
4.6.1 Appearance and Mechanical Inspection
4.6.1.1 Appearance Dimensions
Use a vernier caliper to check the appearance dimensions of the platinum thermistor, which shall meet the requirements of 3.5.1. 4.6.1.2 Weight
Use a balance to weigh the weight of the platinum thermistor, which shall meet the requirements of 3.5.2. 4.6.1.3 Appearance Quality
Use visual inspection to check the appearance of the platinum thermistor, which shall meet the requirements of 3.5.3. 4.6.2 Nominal resistance and its accuracy
Put the sample into the test tube, plug the tube mouth, and then insert it into the ice water tank. The thickness of the ice layer around the test tube should not be less than 30mm, and the insertion depth should not be less than 300mm. Run for 30 minutes, and use the digital multimeter with a resistance range of less than 0.5mA to measure R. , and calculate the resistance value accuracy A according to formula (4):
ReRe×100%
Where: R. is the measured resistance value at 0C, Q;
R. is the nominal resistance value at 0C, n.
The calculated result after the test should meet the requirements of 3.6.3. 4.6.3 Resistance overflow coefficient
Use the method in 4.6.2 to measure the resistance value R at 0C. , insert the test tube with the sample into the oil, stabilize for 30 minutes at 100±0.1℃, measure R100 with the resistance range of less than 0.5mA of the digital multimeter, and calculate the resistance temperature coefficient at
Riro -R according to formula (5).
ar=100×Ro
where: α - resistance temperature coefficient of 0℃, 100℃, ℃-1R. Measured resistance value at 0℃, n;
R100 - measured resistance value at 100℃. The calculated result after the test shall meet the requirements of 3.6.4.1. 8
4.6.4 Tolerance
4.6.4.1 Inspection equipment
SJ 20647—97
a. First-class standard mercury thermometer or second-class standard platinum resistance thermometer; b. Temperature measuring bridge:
c, digital multimeter, 51/2;
d. 0.01-level standard resistor (its resistance is the same as that of the sample); e. Oil-immersed or air-type multi-point conversion switch: f. Ice point tank and value temperature tank.
4.6.4.2 Inspection method
Tolerance inspection is carried out by comparison method. Resistance measurement adopts the bridge method shown in Figure 1. The resistor to be measured and the standard resistor are placed in the constant temperature tank or the ice point uniform temperature zone. The placement depth should be greater than 300mm, and the constant temperature is 30min. During measurement, the self-heating temperature rise caused by the excitation current shall not exceed one-fifth of the allowable difference of the platinum thermistor at the test temperature, and the test current shall be reversed. Set R first, then R, repeat the measurement more than twice, and use the average as the result of a test, which shall meet the requirements of 3.6.4.3.
Rx——Thermistor to be tested
Rn-—Standard variable resistor (resistance box)
1—Conversion switch (double-pole double-position)
HI, P2--Digital multimeter or galvanometer
R3-—Current limiting resistor
4.6.5 Insulation resistance
4.6.5.1 Test equipment
2——Temperature measuring bridge
PI, P2-Standard bridge hip resistor
Insulation resistance tester: The accuracy is not less than 10%, and the minimum test voltage is 100V main 10%DC. 4.6.5.2 Inspection method
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SJ 20647--97
The insulation resistance of the platinum thermistor shall be inspected in accordance with the provisions of GJB360.28. The resistor under test shall be kept at 30in under the specified test conditions. The DC test voltage specified in the detailed specification shall be continuously applied between the lead terminals of the tested torque converter and the surface of the insulation layer for 2min, and the reading shall be taken immediately. When the insulation resistance reading on the tester is consistent with the specified limit value and is stable or continues to increase, the reading can be taken earlier than the specified time. The insulation resistance values in both the positive and negative directions shall be measured. Among the stable data measured, the smallest one shall be taken as the insulation resistance value of the resistor under test. The result shall meet the requirements of 3.6.5. 4.6.6 Thermal response time
The thermal response time of the platinum thermistor shall be inspected in accordance with the provisions of 4.5 in ZBY301. If it meets the requirements of 3.6.6.
4.6.7 Self-heating effect
The self-heating effect of platinum thermistors shall be tested according to the provisions of 4.7 of ZBY301, and the results shall meet the requirements of 3.6.7. 4.6.8 Repeatability error
Use the method of 4.6.2 to measure the resistance value R at 0℃. Then put the sample into a high-temperature furnace at the temperature specified in the detailed specification (generally the upper limit of the use temperature) for 2 hours, take out the sample and place it under the standard atmospheric conditions of the test to recover for 30 minutes, and then measure Ro1 of the sample according to the method of 4.6.2. Repeat this twice to measure Ro2 and Ro3 respectively. Calculate the repeatability error 3f according to Gongwu (6): Rol-R.I+1ReRI+IRosR.l ×100%8,=
The calculated result after the test shall meet the requirements of 3.6.8. 4.7 Environmental adaptability
4.7.1 Strength of lead terminals
Tension test shall be conducted according to test condition A of GJB360.21. The fixing method and the applied force shall be specified by the detailed specification. The result shall meet the requirements of 3.7.1.
4.7.2 Temperature shock
Test according to the test method specified in GJB360.7. The test conditions shall be selected by the detailed specification. The result shall meet the requirements of 3.7.2.
4.7.3 Low-frequency vibration
Test according to the test method specified in GJB360.13. The test conditions shall be selected by the detailed specification. The junction shall meet the requirements of 3.7.3.
4.7.4 High-frequency vibration
Test according to the test method specified in GJB360.15. The test conditions shall be selected by the detailed specification. The result shall meet the requirements of 3.7.4.
4.7.5 Shock (specified pulse)
Test according to the test method specified in GJB360.23, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.5.
4.7.6 Steady-state damp heat
Test according to the test method specified in GJB360.3, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.6.
4.7.7 High temperature life
Test according to the test method specified in GJB360.8, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.7.
5 Delivery preparation
5.1 Marking and packaging
SI 20647—97
Platinum thermistors are small products and generally do not have nameplates. They should have special packaging boxes and shock protection. The box should contain the product manual and certificate. The box should be sealed and marked with: 8. Contractor name and trademark;
b. Product name, model and specification:
c. Manufacturing date and export number:
d. Inspection date and inspector code;
e. Detailed specification number.
5.2 Storage
The storage period of platinum thermistors is specified by the detailed specifications. They should be stored in a ventilated warehouse without corrosive gas at an ambient temperature of -10 to 40°C and a relative humidity of no more than 80%. 5.3 Transportation
Platinum thermistors should be transported in firm packaging boxes. The markings on the outside of the boxes should comply with the provisions of 5.1 and should be marked with "Handle with care" and "Beshy" according to GB191. The packaging boxes containing the products can be transported by any means. During transportation, direct impact and mechanical shock should be avoided. 6 Notes
6.1 Intended use
Platinum thermistors are mainly used for temperature measurement, temperature control and temperature compensation in temperature measurement and control systems. Products that meet this specification: The specific use should be stated in the detailed specifications. 6.2 Contents of order documents
The order or contract should include the following: a. The number and name of the detailed specification adopted; b. Product specifications and quantity;
c. Special packaging and transportation requirements; d. Other requirements.
6.3 Precautions for use
Products that meet this specification should give the precautions for use of the product or provide an instruction manual. 11
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Weigh the weight of the platinum thermistor with a balance, which shall meet the requirements of 3.5.2. 4.6.1.3 Appearance Quality
The appearance of the platinum thermistor shall meet the requirements of 3.5.3 by visual inspection. 4.6.2 Nominal resistance and its accuracy
Put the sample into the test tube, plug the tube mouth, and then insert it into the ice water tank. The thickness of the ice layer around the test tube shall not be less than 30mm, and the insertion depth shall not be less than 300mm. Run for 30 minutes, and use the digital multimeter with a resistance range of less than 0.5mA to measure R. , and calculate the resistance value accuracy A according to formula (4):
ReRe×100%
Where: R. is the measured resistance value at 0, Q;
R. is the nominal resistance value at 0C, n.
The calculated result after the test shall meet the requirements of 3.6.3. 4.6.3 Resistance overflow coefficient
Use the method in 4.6.2 to measure the resistance value R at 0°C. Then, insert the test tube containing the sample into the oil and stabilize it at 100±0.1°C for 30 minutes. Use the digital multimeter with a resistance range of less than 0.5mA to measure R100. Calculate the resistance temperature coefficient at
Riro -R according to formula (5).
ar=100×Ro
Where: α - resistance temperature coefficient of 0°C and 100°C, ℃-1R. Measured resistance value at 0°C, n;
R100 - measured resistance value at 100°C. The calculated result after the test shall meet the requirements of 3.6.4.1. 8
4.6.4 Tolerance
4.6.4.1 Inspection equipment
SJ 20647—97
a. First-class standard mercury thermometer or second-class standard platinum resistance thermometer; b. Temperature measuring bridge:
c, digital multimeter, 51/2;
d. 0.01-level standard resistor (its resistance is the same as that of the sample); e. Oil-immersed or air-type multi-point conversion switch: f. Ice point tank and value temperature tank.
4.6.4.2 Inspection method
Tolerance inspection is carried out by comparison method. Resistance measurement adopts the bridge method shown in Figure 1. The resistor to be measured and the standard resistor are placed in the constant temperature tank or the ice point uniform temperature zone. The placement depth should be greater than 300mm, and the constant temperature is 30min. During measurement, the self-heating temperature rise caused by the excitation current shall not exceed one-fifth of the allowable difference of the platinum thermistor at the test temperature, and the test current shall be reversed. Set R first, then R, repeat the measurement more than twice, and use the average as the result of a test, which shall meet the requirements of 3.6.4.3.
Rx——Thermistor to be tested
Rn-—Standard variable resistor (resistance box)
1—Conversion switch (double-pole double-position)
HI, P2--Digital multimeter or galvanometer
R3-—Current limiting resistor
4.6.5 Insulation resistance
4.6.5.1 Test equipment
2——Temperature measuring bridge
PI, P2-Standard bridge hip resistor
Insulation resistance tester: The accuracy is not less than 10%, and the minimum test voltage is 100V main 10%DC. 4.6.5.2 Inspection method
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SJ 20647--97
The insulation resistance of the platinum thermistor shall be inspected in accordance with the provisions of GJB360.28. The resistor under test shall be kept at 30in under the specified test conditions. The DC test voltage specified in the detailed specification shall be continuously applied between the lead terminals of the tested torque converter and the surface of the insulation layer for 2min, and the reading shall be taken immediately. When the insulation resistance reading on the tester is consistent with the specified limit value and is stable or continues to increase, the reading can be taken earlier than the specified time. The insulation resistance values in both the positive and negative directions shall be measured. Among the stable data measured, the smallest one shall be taken as the insulation resistance value of the resistor under test. The result shall meet the requirements of 3.6.5. 4.6.6 Thermal response time
The thermal response time of the platinum thermistor shall be inspected in accordance with the provisions of 4.5 in ZBY301. If it meets the requirements of 3.6.6.
4.6.7 Self-heating effect
The self-heating effect of platinum thermistors shall be tested according to the provisions of 4.7 of ZBY301, and the results shall meet the requirements of 3.6.7. 4.6.8 Repeatability error
Use the method of 4.6.2 to measure the resistance value R at 0℃. Then put the sample into a high-temperature furnace at the temperature specified in the detailed specification (generally the upper limit of the use temperature) for 2 hours, take out the sample and place it under the standard atmospheric conditions of the test to recover for 30 minutes, and then measure Ro1 of the sample according to the method of 4.6.2. Repeat this twice to measure Ro2 and Ro3 respectively. Calculate the repeatability error 3f according to Gongwu (6): Rol-R.I+1ReRI+IRosR.l ×100%8,=
The calculated result after the test shall meet the requirements of 3.6.8. 4.7 Environmental adaptability
4.7.1 Strength of lead terminals
Tension test shall be conducted according to test condition A of GJB360.21. The fixing method and the applied force shall be specified by the detailed specification. The result shall meet the requirements of 3.7.1.
4.7.2 Temperature shock
Test according to the test method specified in GJB360.7. The test conditions shall be selected by the detailed specification. The result shall meet the requirements of 3.7.2.
4.7.3 Low-frequency vibration
Test according to the test method specified in GJB360.13. The test conditions shall be selected by the detailed specification. The junction shall meet the requirements of 3.7.3.
4.7.4 High-frequency vibration
Test according to the test method specified in GJB360.15. The test conditions shall be selected by the detailed specification. The result shall meet the requirements of 3.7.4.
4.7.5 Shock (specified pulse)
Test according to the test method specified in GJB360.23, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.5.
4.7.6 Steady-state damp heat
Test according to the test method specified in GJB360.3, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.6.
4.7.7 High temperature life
Test according to the test method specified in GJB360.8, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.7.
5 Delivery preparation
5.1 Marking and packaging
SI 20647—97
Platinum thermistors are small products and generally do not have nameplates. They should have special packaging boxes and shock protection. The box should contain the product manual and certificate. The box should be sealed and marked with: 8. Contractor name and trademark;
b. Product name, model and specification:
c. Manufacturing date and export number:
d. Inspection date and inspector code;
e. Detailed specification number.
5.2 Storage
The storage period of platinum thermistors is specified by the detailed specifications. They should be stored in a ventilated warehouse without corrosive gas at an ambient temperature of -10 to 40°C and a relative humidity of no more than 80%. 5.3 Transportation
Platinum thermistors should be transported in firm packaging boxes. The markings on the outside of the boxes should comply with the provisions of 5.1 and should be marked with "Handle with care" and "Beshy" according to GB191. The packaging boxes containing the products can be transported by any means. During transportation, direct impact and mechanical shock should be avoided. 6 Notes
6.1 Intended use
Platinum thermistors are mainly used for temperature measurement, temperature control and temperature compensation in temperature measurement and control systems. Products that meet this specification: The specific use should be stated in the detailed specifications. 6.2 Contents of order documents
The order or contract should include the following: a. The number and name of the detailed specification adopted; b. Product specifications and quantity;
c. Special packaging and transportation requirements; d. Other requirements.
6.3 Precautions for use
Products that meet this specification should give the precautions for use of the product or provide an instruction manual. 11
TTKAONKAa2 Weight
Weigh the weight of the platinum thermistor with a balance, which shall meet the requirements of 3.5.2. 4.6.1.3 Appearance Quality
The appearance of the platinum thermistor shall meet the requirements of 3.5.3 by visual inspection. 4.6.2 Nominal resistance and its accuracy
Put the sample into the test tube, plug the tube mouth, and then insert it into the ice water tank. The thickness of the ice layer around the test tube shall not be less than 30mm, and the insertion depth shall not be less than 300mm. Run for 30 minutes, and use the digital multimeter with a resistance range of less than 0.5mA to measure R. , and calculate the resistance value accuracy A according to formula (4):
ReRe×100%
Where: R. is the measured resistance value at 0, Q;
R. is the nominal resistance value at 0C, n.
The calculated result after the test shall meet the requirements of 3.6.3. 4.6.3 Resistance overflow coefficient
Use the method in 4.6.2 to measure the resistance value R at 0°C. Then, insert the test tube containing the sample into the oil and stabilize it at 100±0.1°C for 30 minutes. Use the digital multimeter with a resistance range of less than 0.5mA to measure R100. Calculate the resistance temperature coefficient at
Riro -R according to formula (5).
ar=100×Ro
Where: α - resistance temperature coefficient of 0°C and 100°C, ℃-1R. Measured resistance value at 0°C, n;
R100 - measured resistance value at 100°C. The calculated result after the test shall meet the requirements of 3.6.4.1. 8
4.6.4 Tolerance
4.6.4.1 Inspection equipment
SJ 20647—97
a. First-class standard mercury thermometer or second-class standard platinum resistance thermometer; b. Temperature measuring bridge:
c, digital multimeter, 51/2;
d. 0.01-level standard resistor (its resistance is the same as that of the sample); e. Oil-immersed or air-type multi-point conversion switch: f. Ice point tank and value temperature tank.
4.6.4.2 Inspection method
Tolerance inspection is carried out by comparison method. Resistance measurement adopts the bridge method shown in Figure 1. The resistor to be measured and the standard resistor are placed in the constant temperature tank or the ice point uniform temperature zone. The placement depth should be greater than 300mm, and the constant temperature is 30min. During measurement, the self-heating temperature rise caused by the excitation current shall not exceed one-fifth of the allowable difference of the platinum thermistor at the test temperature, and the test current shall be reversed. Set R first, then R, repeat the measurement more than twice, and use the average as the result of a test, which shall meet the requirements of 3.6.4.3.
Rx——Thermistor to be tested
Rn-—Standard variable resistor (resistance box)
1—Conversion switch (double-pole double-position)
HI, P2--Digital multimeter or galvanometer
R3-—Current limiting resistor
4.6.5 Insulation resistance
4.6.5.1 Test equipment
2——Temperature measuring bridge
PI, P2-Standard bridge hip resistor
Insulation resistance tester: The accuracy is not less than 10%, and the minimum test voltage is 100V main 10%DC. 4.6.5.2 Inspection method
TTKAONKAa-
SJ 20647--97
The insulation resistance of the platinum thermistor shall be inspected in accordance with the provisions of GJB360.28. The resistor under test shall be kept at 30in under the specified test conditions. The DC test voltage specified in the detailed specification shall be continuously applied between the lead terminals of the tested torque converter and the surface of the insulation layer for 2min, and the reading shall be taken immediately. When the insulation resistance reading on the tester is consistent with the specified limit value and is stable or continues to increase, the reading can be taken earlier than the specified time. The insulation resistance values in both the positive and negative directions shall be measured. Among the stable data measured, the smallest one shall be taken as the insulation resistance value of the resistor under test. The result shall meet the requirements of 3.6.5. 4.6.6 Thermal response time
The thermal response time of the platinum thermistor shall be inspected in accordance with the provisions of 4.5 in ZBY301. If it meets the requirements of 3.6.6.
4.6.7 Self-heating effect
The self-heating effect of platinum thermistors shall be tested according to the provisions of 4.7 of ZBY301, and the results shall meet the requirements of 3.6.7. 4.6.8 Repeatability error
Use the method of 4.6.2 to measure the resistance value R at 0℃. Then put the sample into a high-temperature furnace at the temperature specified in the detailed specification (generally the upper limit of the use temperature) for 2 hours, take out the sample and place it under the standard atmospheric conditions of the test to recover for 30 minutes, and then measure Ro1 of the sample according to the method of 4.6.2. Repeat this twice to measure Ro2 and Ro3 respectively. Calculate the repeatability error 3f according to Gongwu (6): Rol-R.I+1ReRI+IRosR.l ×100%8,=
The calculated result after the test shall meet the requirements of 3.6.8. 4.7 Environmental adaptability
4.7.1 Strength of lead terminals
Tension test shall be conducted according to test condition A of GJB360.21. The fixing method and the applied force shall be specified by the detailed specification. The result shall meet the requirements of 3.7.1.
4.7.2 Temperature shock
Test according to the test method specified in GJB360.7. The test conditions shall be selected by the detailed specification. The result shall meet the requirements of 3.7.2.
4.7.3 Low-frequency vibration
Test according to the test method specified in GJB360.13. The test conditions shall be selected by the detailed specification. The junction shall meet the requirements of 3.7.3.
4.7.4 High-frequency vibration
Test according to the test method specified in GJB360.15. The test conditions shall be selected by the detailed specification. The result shall meet the requirements of 3.7.4.
4.7.5 Shock (specified pulse)
Test according to the test method specified in GJB360.23, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.5.
4.7.6 Steady-state damp heat
Test according to the test method specified in GJB360.3, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.6.
4.7.7 High temperature life
Test according to the test method specified in GJB360.8, and the test conditions shall be selected by the detailed specification. The results shall meet the requirements of 3.7.7.
5 Delivery preparation
5.1 Marking and packaging
SI 20647—97
Platinum thermistors are small products and generally do not have nameplates. They should have special packaging boxes and shock protection. The box should contain the product manual and certificate. The box should be sealed and marked with: 8. Contractor name and trademark;
b. Product name, model and specification:
c. Manufacturing date and export number:
d. Inspection date and inspector code;
e. Detailed specification number.
5.2 Storage
The storage period of platinum thermistors is specified by the detailed specifications. They should be stored in a ventilated warehouse without corrosive gas at an ambient temperature of -10 to 40°C and a relative humidity of no more than 80%. 5.3 Transportation
Platinum thermistors should be transported in firm packaging boxes. The markings on the outside of the boxes should comply with the provisions of 5.1 and should be marked with "Handle with care" and "Beshy" according to GB191. The packaging boxes containing the products can be transported by any means. During transportation, direct impact and mechanical shock should be avoided. 6 Notes
6.1 Intended use
Platinum thermistors are mainly used for temperature measurement, temperature control and temperature compensation in temperature measurement and control systems. Products that meet this specification: The specific use should be stated in the detailed specifications. 6.2 Contents of order documents
The order or contract should include the following: a. The number and name of the detailed specification adopted; b. Product specifications and quantity;
c. Special packaging and transportation requirements; d. Other requirements.
6.3 Precautions for use
Products that meet this specification should give the precautions for use of the product or provide an instruction manual. 11
TTKAONKAaMeasure R at the 5mA resistance range, and calculate the resistance value accuracy A according to formula (4):
ReRe×100%
Where: R is the measured resistance value at 0°C, Q;
R is the nominal resistance value at 0°C, n.
The calculated result after the test should meet the requirements of 3.6.3. 4.6.3 Resistance overflow coefficient
Measure the resistance value R at 0°C using the method in 4.6.2, and insert the test tube containing the sample into the oil, stabilize it at 100±0.1°C for 30 minutes, and measure R100 with the resistance range of the digital multimeter less than 0.5mA, and calculate the resistance temperature coefficient at
Riro -R according to formula (5).
ar=100×Ro
Where: α-0°C, 100°C resistance temperature coefficient, °C-1R. The measured resistance value at 0℃, n;
R100————The measured resistance value at 100℃. The calculated result after the test shall meet the requirements of 3.6.4.1. 8
4.6.4 Tolerance
4.6.4.1 Inspection equipment
SJ 20647—97
a. First-class standard mercury thermometer or second-class standard platinum resistance overflow meter; b. Temperature measuring bridge:
c, digital multimeter, 51/2;
d. 0.01-level standard resistor (its resistance is the same as that of the sample); e. Oil-immersed or air-type multi-point conversion switch: f. Ice point tank and value temperature tank.
4.6.4.2 Inspection method
The tolerance inspection is carried out by comparison method. The resistance measurement adopts the bridge method shown in Figure 1. Place the resistor to be tested and the standard resistor in a constant temperature bath or in the temperature zone of the ice point. The depth of placement should be greater than 300mm. Keep the temperature constant for 30min before measuring. During measurement, the self-heating temperature rise caused by the excitation current shall not exceed one fifth of the allowable value of the platinum thermistor at the test temperature. The test current should be reversed. Place R first, then R, repeat the measurement more than twice, and take the average as the result of one measurement. It should meet the requirements of 3.6.4.3.
Rx——Thermistor to be tested
Rn-—Standard variable resistor (resistance box)
1—Conversion switch (double-pole double-position)
HI, P2--Digital multimeter or galvanometer
R3-—Current limiting resistor
4.6.5 Insulation resistance
4.6.5.1 Test equipment
2——Thermometry bridge
PI, P2-Standard bridge hip resistor
Insulation resistance tester: The accuracy is not less than 10%, and the minimum test voltage is 100V main 10%DC. 4.6.5.2 Test method
TTKAONKAa-
SJ 20647--97
The insulation resistance of platinum thermal resistor shall be tested in accordance with the provisions of GJB360.28. The resistor under test is maintained at 30in under the specified test conditions. The DC test voltage specified in the detailed specification is continuously applied between each lead terminal of the tested torque converter and the surface of the insulation layer for 2min, and the reading is taken immediately. When the insulation resistance reading on the tester is consistent with the specified limit value and is stable or continues to increase, the reading can be taken earlier than the specified time. The insulation resistance values in both the positive and negative directions should be measured. Among the measured stable data, the smallest one is taken as the insulation resistance value of the resistor under test, and the result should meet the requirements of 3.6.5. 4.6.6 Thermal response time
The thermal response time of platinum thermistors shall be inspected in accordance with the provisions of 4.5 in ZBY301, and if it meets the requirements of 3.6.6.
4.6.7 Self-heating effect
The self-heating effect of platinum thermistors shall be inspected in accordance with the provisions of 4.7 in ZBY301, and the results shall meet the requirements of 3.6.7. 4.6.8 Repeatability error
Use the method in 4.6.2 to measure the resistance value R at 0℃. Then put the sample into a high temperature furnace at the temperature specified in the detailed specification (generally the upper limit of use temperature) for 2 hours, take out the sample and place it under the standard test atmosphere to recover for 30 minutes, and then measure Ro1 of the sample according to the method in 4.6.2. Repeat this process twice to measure Ro2 and Ro3 respectively. Calculate the repeatability error 3f according to Gongwu (6): Rol-R.I+1ReRI+IRosR.l ×100%8,=
The calculated result after the test should meet the requirements of 3.6.8. 4.7 Environmental adaptability
4.7.1 Strength of lead terminal
Perform a tensile test according to test condition A of GJB360.21. The fixing method and applied force are specified by the detailed specification. The result should meet the requirements of 3.7.1.
4.7.2 Temperature shock
Test according to the test method specified in GJB360.7, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.2.
4.7.3 Low-frequency vibration
Test according to the test method specified in GJB360.13, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.3.
4.7.4 High-frequency vibration
Test according to the test method specified in GJB360.15, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.4.
4.7.5 Shock (specified pulse)
Test according to the test method specified in GJB360.23, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.5.
4.7.6 Steady-state damp heat
Test according to the test method specified in GJB360.3, and the test conditions shall be selected by the detailed specifications. The results shall meet the requirements of 3.7.6.
4.7.7 High-temperature life
Test according to the test method specified in GJB360.8, and the test conditions shall be selected by the detailed specifications. The results shall meet the requirements of 3.7.7.
5 Delivery preparation
5.1 Marking and packaging
SI 20647—97
Platinum thermistors are small products and generally do not have nameplates. They should have a dedicated packaging box with shock protection. The box should contain the product instruction manual and certificate of conformity. The packaging box should be sealed and marked: 8. b. Name and trademark of the contractor;
c. Date of manufacture and advertisement number:
d. Date of inspection and inspector code;
e. Detailed specification number.
5.2 Storage
The storage period of platinum thermistors is specified in the detailed specifications and should be stored in a ventilated warehouse without the influence of corrosive gases at an ambient temperature of -10 to 40°C and a relative humidity of no more than 80%. 5.3 Transportation
Platinum thermistors should be transported in firm packaging boxes. The markings on the outside of the boxes should comply with the provisions of 5.1 and should be marked with "Handle with care" and "Beshy" according to GB191. The packaging boxes containing the products can be transported by any means. During transportation, direct impact and mechanical shock should be avoided. 6 Notes
6.1 Intended use
Platinum thermistors are mainly used for temperature measurement, temperature control and temperature compensation in temperature measurement and control systems. Products that meet this specification: The specific use should be stated in the detailed specifications. 6.2 Contents of order documents
The order or contract should include the following: a. The number and name of the detailed specification adopted; b. Product specifications and quantity;
c. Special packaging and transportation requirements; d. Other requirements.
6.3 Precautions for use
Products that meet this specification should give the precautions for use of the product or provide an instruction manual. 11
TTKAONKAaMeasure R at the 5mA resistance range, and calculate the resistance value accuracy A according to formula (4):
ReRe×100%
Where: R is the measured resistance value at 0°C, Q;
R is the nominal resistance value at 0°C, n.
The calculated result after the test should meet the requirements of 3.6.3. 4.6.3 Resistance overflow coefficient
Measure the resistance value R at 0°C using the method in 4.6.2, and insert the test tube containing the sample into the oil, stabilize it at 100±0.1°C for 30 minutes, and measure R100 with the resistance range of the digital multimeter less than 0.5mA, and calculate the resistance temperature coefficient at
Riro -R according to formula (5).
ar=100×Ro
Where: α-0°C, 100°C resistance temperature coefficient, °C-1R. The measured resistance value at 0℃, n;
R100————The measured resistance value at 100℃. The calculated result after the test shall meet the requirements of 3.6.4.1. 8
4.6.4 Tolerance
4.6.4.1 Inspection equipment
SJ 20647—97
a. First-class standard mercury thermometer or second-class standard platinum resistance overflow meter; b. Temperature measuring bridge:
c, digital multimeter, 51/2;
d. 0.01-level standard resistor (its resistance is the same as that of the sample); e. Oil-immersed or air-type multi-point conversion switch: f. Ice point tank and value temperature tank.
4.6.4.2 Inspection method
The tolerance inspection is carried out by comparison method. The resistance measurement adopts the bridge method shown in Figure 1. Place the resistor to be tested and the standard resistor in a constant temperature bath or in the temperature zone of the ice point. The depth of placement should be greater than 300mm. Keep the temperature constant for 30min before measuring. During measurement, the self-heating temperature rise caused by the excitation current shall not exceed one fifth of the allowable value of the platinum thermistor at the test temperature. The test current should be reversed. Place R first, then R, repeat the measurement more than twice, and take the average as the result of one measurement. It should meet the requirements of 3.6.4.3.
Rx——Thermistor to be tested
Rn-—Standard variable resistor (resistance box)
1—Conversion switch (double-pole double-position)
HI, P2--Digital multimeter or galvanometer
R3-—Current limiting resistor
4.6.5 Insulation resistance
4.6.5.1 Test equipment
2——Thermometry bridge
PI, P2-Standard bridge hip resistor
Insulation resistance tester: The accuracy is not less than 10%, and the minimum test voltage is 100V main 10%DC. 4.6.5.2 Test method
TTKAONKAa-
SJ 20647--97
The insulation resistance of platinum thermal resistor shall be tested in accordance with the provisions of GJB360.28. The resistor under test is maintained at 30in under the specified test conditions. The DC test voltage specified in the detailed specification is continuously applied between each lead terminal of the tested torque converter and the surface of the insulation layer for 2min, and the reading is taken immediately. When the insulation resistance reading on the tester is consistent with the specified limit value and is stable or continues to increase, the reading can be taken earlier than the specified time. The insulation resistance values in both the positive and negative directions should be measured. Among the measured stable data, the smallest one is taken as the insulation resistance value of the resistor under test, and the result should meet the requirements of 3.6.5. 4.6.6 Thermal response time
The thermal response time of platinum thermistors shall be inspected in accordance with the provisions of 4.5 in ZBY301, and if it meets the requirements of 3.6.6.
4.6.7 Self-heating effect
The self-heating effect of platinum thermistors shall be inspected in accordance with the provisions of 4.7 in ZBY301, and the results shall meet the requirements of 3.6.7. 4.6.8 Repeatability error
Use the method in 4.6.2 to measure the resistance value R at 0℃. Then put the sample into a high temperature furnace at the temperature specified in the detailed specification (generally the upper limit of use temperature) for 2 hours, take out the sample and place it under the standard test atmosphere to recover for 30 minutes, and then measure Ro1 of the sample according to the method in 4.6.2. Repeat this process twice to measure Ro2 and Ro3 respectively. Calculate the repeatability error 3f according to Gongwu (6): Rol-R.I+1ReRI+IRosR.l ×100%8,=
The calculated result after the test should meet the requirements of 3.6.8. 4.7 Environmental adaptability
4.7.1 Strength of lead terminal
Perform a tensile test according to test condition A of GJB360.21. The fixing method and applied force are specified by the detailed specification. The result should meet the requirements of 3.7.1.
4.7.2 Temperature shock
Test according to the test method specified in GJB360.7, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.2.
4.7.3 Low-frequency vibration
Test according to the test method specified in GJB360.13, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.3.
4.7.4 High-frequency vibration
Test according to the test method specified in GJB360.15, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.4.
4.7.5 Shock (specified pulse)
Test according to the test method specified in GJB360.23, and the test conditions are selected by the detailed specifications. The results shall meet the requirements of 3.7.5.
4.7.6 Steady-state damp heat
Test according to the test method specified in GJB360.3, and the test conditions shall be selected by the detailed specifications. The results shall meet the requirements of 3.7.6.
4.7.7 High-temperature life
Test according to the test method specified in GJB360.8, and the test conditions shall be selected by the detailed specifications. The results shall meet the requirements of 3.7.7.
5 Delivery preparation
5.1 Marking and packaging
SI 20647—97
Platinum thermistors are small products and generally do not have nameplates. They should have a dedicated packaging box with shock protection. The box should contain the product instruction manual and certificate of conformity. The packaging box should be sealed and marked: 8. b. Name and trademark of the contractor;
c. Date of manufacture and advertisement number:
d. Date of inspection and inspector code;
e. Detailed specification number.
5.2 Storage
The storage period of platinum thermistors is specified in the detailed specifications and should be stored in a ventilated warehouse without the influence of corrosive gases at an ambient temperature of -10 to 40°C and a relative humidity of no more than 80%. 5.3 Transportation
Platinum thermistors should be transported in firm packaging boxes. The markings on the outside of the boxes should comply with the provisions of 5.1 and should be marked with "Handle with care" and "Beshy" according to GB191. The packaging boxes containing the products can be transported by any means. During transportation, direct impact and mechanical shock should be avoided. 6 Notes
6.1 Intended use
Platinum thermistors are mainly used for temperature measurement, temperature control and temperature compensation in temperature measurement and control systems. Products that meet this specification: The specific use should be stated in the detailed specifications. 6.2 Contents of order documents
The order or contract should include the following: a. The number and name of the detailed specification adopted; b. Product specifications and quantity;
c. Special packaging and transportation requirements; d. Other requirements.
6.3 Precautions for use
Products that meet this specification should give the precautions for use of the product or provide an instruction manual. 11
TTKAONKAa2 Inspection method
Tolerance inspection is carried out by comparison method. Resistance measurement adopts the bridge method shown in Figure 1. Place the measured resistor and the standard resistor in a constant temperature bath or in the uniform temperature zone of the ice point. The insertion depth should be greater than 300mm. Keep the constant temperature for 30min and measure. During measurement, the self-heating temperature rise caused by the excitation current shall not exceed one-fifth of the tolerance value of the platinum thermistor at the test temperature, and the test current should change direction. Set R first, then R, repeat the measurement more than twice, and take the average as the result of one measurement, which should meet the requirements of 3.6.4.3.
Rx——Thermistor to be tested
Rn-—Standard variable resistor (resistance box)
1—Conversion switch (double-pole double-position)
HI, P2--Digital multimeter or galvanometer
R3-—Current limiting resistor
4.6.5 Insulation resistance
4.6.5.1 Test equipment
2——Thermometry bridge
PI, P2-Standard bridge hip resistor
Insulation resistance tester: The accuracy is not less than 10%, and the minimum test voltage is 100V main 10%DC. 4.6.5.2 Test method
TTKAONKAa-
SJ 20647--97
The insulation resistance of platinum thermal resistor shall be tested in accordance with the provisions of GJB360.28. The resistor under test is maintained at 30in under the specified test conditions. The DC test voltage specified in the detailed specification is continuously applied between each lead terminal of the tested torque converter and the surface of the insulation layer for 2min, and the reading is taken immediately. When the insulation resistance reading on the tester is consistent with the specified limit value and is stable or continues to increase, the reading can be taken earlier than the specified time. The insulation resistance values in both the positive and negative directions should be measured. Among the measured stable data, the smallest one is taken as the insulation resistance value of the resistor under test, and the result should meet the requirements of 3.6.5. 4.6.6 Thermal response time
The thermal response time of platinum thermistors shall be inspected in accordance with the provisions of 4.5 in ZBY301, and if it meets the requirements of 3.6.6.
4.6.7 Self-heating effect
The self-heating effect of platinum thermistors shall be inspected in accordance with the provisions of 4.7 in ZBY301, and the results shall meet the requirements of 3.6.7. 4.6.8 Repeatability error
Use the method in 4.6.2 to measure the resistance value R at 0℃. Then put the sample into a high temperature furnace at the temperature specified in the detailed specification (generally the upper limit of use temperatu
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