Some standard content:
Military Standard of the Electronic Industry of the People's Republic of China FL5910
SJ20032-92
Air Dielectric Tubular (Piston Type)
Trimmer Variable Capacitors
1992-02-01 Issued
China Electronics Industry Corporation
1992-05-01 Implementation
1 Scope
Military Standard of the Electronic Industry of the People's Republic of China Air Dielectric Tubular (Piston Type) Trimmer Variable Capacitors Specification
Airdielectric tubular (piston type) trimmer variable capacitors
1.1 Subject Content
SJ20032-92
This specification specifies the general requirements, quality assurance provisions and test methods for military air dielectric tubular (piston type) trimmer variable capacitors.
1.2 Scope of Application
This specification applies to air dielectric tubular (piston type) fine-tuning variable capacitors, which are mainly used for high-frequency tuning in military electronic equipment. During the effective life of the equipment, only minimal adjustments are required. 1.3 Classification
1.3.1 Model
The model composition shall be in the following form and marked as specified in the detailed specification. JCWG
Nominal maximum capacitance (1.3.1.4)
Characteristic code (1.3.1.3)
Category code (1.3.1.2)
Main code (1.3.1.1)
1.3.1.1 Main code
Indicated by JCWG, it represents military air dielectric tubular fine-tuning variable capacitors. 1.3.1.2 Category code
Two digits are used to indicate the appearance or different electrical characteristics of the capacitor. 1.3.1.3 Characteristic code
Characteristic code is indicated by one letter according to Table 1. 1.3.1.4 Nominal maximum capacitance
is indicated directly by digits in pF. If there is a decimal point, p is used to indicate the decimal point. For example, if the nominal maximum capacitance is 3.5pF, it is indicated as 3p5.
China Electronics Industry Corporation Issued on February 1, 1992 Implemented on May 1, 1992
2 Referenced Documents
Operating Temperature Range
—55~+125
-55～+125
-55～+125
—65~+125
—55~+125
-55～+125
SJ20032—92
Temperature Coefficient at Ambient Temperature of 25℃
10-8/℃
50±50
Capacitance Source Shift
Nominal Maximum Capacitance 0.5%
±0.2% of nominal maximum capacitance
or 0.04pF (whichever is greater)
±0.15% of nominal maximum capacitancewww.bzxz.net
or 0.02pF (whichever is greater)
±0.1% of nominal maximum capacitance
or 0.01pF (whichever is greater)
±0.1% of nominal maximum capacitance
or 0.01pF (whichever is greater)
±0.18% of nominal maximum capacitance
or 0.03pF (whichever is greater)
The valid versions of the following documents constitute part of this specification within the scope specified in this specification. When there is a conflict between the main text of this specification and the referenced documents, the provisions of this specification shall prevail. GB191 — 85 | | tt | | GB197 — 81 | | tt | |tt||GJB360.7--87
GJB360.15—87
GJB 360.18—87
GJB360.20—87
GJB360.21—87
GJB360.23—87
GJB360.27-—87
GJB360.28-87
GJB360.31-87
GJB360.32——87
3 Requirements
3.1 Detailed specifications
Packaging storage and transportation diagrams
Tolerances and fits for common threads
Procedures and tables for sampling inspection by attributes
Test methods for electronic and electrical components
Test methods for electronic and electrical components Salt spray test Immersion test
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Low pressure test
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Test methods for electronic and electrical components||t t||Test methods for electronic and electrical components
Test methods for electronic and electrical components
Test methods for electronic and electrical components
, Test methods for electronic and electrical components
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Test methods for electronic and electrical components
Moisture resistance test
Temperature shock test
High frequency vibration test||tt| |Weldability test
Welding heat resistance test
Terminal strength test
Impact (specified pulse) test
Dielectric withstand voltage test
Insulation resistance test
Capacitance test
Quality factor (Q) test
Each air dielectric tubular (piston type) fine-tuning variable capacitor (hereinafter referred to as capacitor) shall comply with the provisions of this specification and the corresponding detailed specifications. If there is a conflict between the requirements of this specification and the requirements of the detailed specifications, the detailed specifications shall prevail. 3.2 Qualification appraisal
Capacitors submitted in accordance with this specification shall be products that have been qualified or approved for finalization. 3.3 Materials
Materials shall comply with the provisions of this specification or detailed specifications. When the materials are not clearly specified, materials that meet the requirements of this specification shall be used for the performance of the capacitor. The acceptance or approval of any material cannot replace the acceptance of the product. 3.4 Design and Construction
The design, construction and physical dimensions of capacitors shall comply with the regulations (see 3.1). 3.4.1 Threaded Parts
All threaded parts shall comply with the provisions of GB197. 3.4.2 Locking of Threaded Fittings
All threaded mounting fittings shall be prevented from loosening when subjected to vibration. Where necessary, nuts shall be provided with locking washers of phosphor bronze, beryllium copper alloy or stainless steel.
3.4.3 Terminals
All terminals shall be coated.
3.4.4 Connections
Electrical connections shall be welded.
3.5 Temperature Shock
After testing in accordance with 4.6.1, capacitors shall be free of cracks or loosening of mechanical connections. In addition, corrosion of exposed metal surfaces shall not exceed 10% (discoloration or loss of gloss alone shall not be grounds for rejection). 3.6 Capacitance
When the capacitance is tested in accordance with 4.6.3, the minimum capacitance shall not be greater, and the maximum capacitance shall not be less, than the specified value (see 3.1). The capacitance range may be wider than the specified range while covering the specified range. 3.7 Capacitance change
When the capacitance is tested in accordance with 4.6.4, the rate of change of capacitance as a function of adjustment shall not change sign over the entire adjustment range.
3.8 Insulation resistance
When the capacitor is tested in accordance with 4.6.5, the insulation resistance shall not be less than the specified value (see 3.1). 3.9 Dielectric withstand voltage
When the capacitor is tested in accordance with 4.6.6, there shall be no signs of damage, arcing or breakdown. 3.10 Quality factor (Q)
When the capacitor is tested in accordance with 4.6.7, the Q value shall be greater than the specified value (see 3.1). 3.11 Short force
3.11.1 Rotation torque
Unless otherwise specified, when the capacitor is tested in accordance with Article 4.6.8.1, the torque required for the rotor to start and maintain rotation within the specified temperature range shall be greater than or equal to 7mN·m and less than or equal to 70mN·m. 3.11.2 Sleeve strength torque (only for panel mounted products) When the capacitor is tested in accordance with Article 4.6.8.2, there shall be no signs of damage to the sleeve, thread stripping or other visible mechanical damage.
3.12 Temperature coefficient and capacitance drift
SJ20032--92
Unless otherwise specified, when the capacitor is tested in accordance with Article 4.6.9, its temperature coefficient and capacitance drift shall be within the range specified in Table 1.
3.13 Diffusion (only for sealed products)
When the capacitor is tested in accordance with Article 4.6.10, it shall meet the following requirements: a. The maximum capacitance change shall not exceed 0.5pF or 5% (whichever is greater); b. The insulation resistance at room temperature shall not be less than 105MQ; c. The dielectric withstand voltage shall comply with the provisions of Article 3.9. 3.14 Salt spray (corrosion)
3.14.1 Salt spray (corrosion) (for sealed products only) When the capacitor is tested in accordance with the provisions of Article 4.6.11.1, it shall meet the following requirements: a. The insulation resistance at room temperature shall not be less than 10\MQ; b. The dielectric withstand voltage shall comply with the provisions of Article 3.9; c. The torque at room temperature shall comply with the provisions of Article 3.11.1; d. The corrosion of the exposed metal surface shall not exceed 10% (fading or loss of gloss alone shall not be a reason for rejection). 3.14.2 Salt spray (corrosion) (for non-sealed products only) When the capacitor is tested in accordance with the provisions of Article 4.6.11.2, the corrosion of the exposed metal surface shall not exceed 10% (fading or loss of gloss alone shall not be a reason for rejection). 3.15 Low temperature storage
When the capacitor is tested in accordance with the provisions of Article 4.6.12, there shall be no visible mechanical damage. 3.16 Impact (specified pulse)
When the capacitor is tested in accordance with the provisions of Article 4.6.13, there shall be no intermittent contact or instantaneous arc, open circuit, short circuit or any crack, loose parts or other visible mechanical damage for 0.5ms or longer. 3.17 High-frequency vibration
When the capacitor is tested in accordance with the provisions of Article 4.6.14, there shall be no intermittent contact or instantaneous arc, open circuit, short circuit or any crack, loose parts or other visible mechanical damage for 0.5ms or longer. The change in capacitance shall not exceed 1% or 0.05pF (whichever is greater).
3.18 Low pressure
Unless otherwise specified, when the capacitor is tested in accordance with the provisions of Article 4.6.15, it shall be able to withstand 50% of the DC rated voltage without damage, arcing or breakdown.
3.19 Moisture resistance
When the capacitor is tested in accordance with Article 4.6.16, it shall meet the following requirements: a. The insulation resistance at room temperature shall not be less than 105M2; b. The dielectric withstand voltage shall still meet the requirements of Article 3.9; c. The torque at room temperature shall meet the requirements of Article 3.11.1; d. The corrosion of the exposed metal surface shall not exceed 10% (fading or loss of gloss alone shall not be a reason for rejection). 3.20 Terminal strength
When the capacitor is tested in accordance with Article 4.6.17, the terminal shall not be loose or broken, and the terminal or capacitor body shall not have other damage.
3.21 Resistance to soldering heat (only for printed circuit mounting products) After the capacitor has been subjected to soldering heat in accordance with Article 4.6.18, it shall meet the following requirements: 4
a, there shall be no signs of mechanical damage;
b. The dielectric withstand voltage shall meet the requirements of Article 3.9;c. The capacitance shall meet the requirements of Article 3.6;
SJ20032-92
d. The quality factor shall meet the requirements of Article 3.10. 3.22 Sealed (only for sealed products)
When the capacitor is tested in accordance with Article 4.6.19, there shall be no signs of dye penetration and shall meet the following requirements: a. The change in maximum capacitance shall not exceed 0.5pF or 5% (whichever is greater); b. The insulation resistance at room temperature shall not be less than 10'M2; C. The dielectric withstand voltage shall meet the requirements of Article 3.9. 3.23 Mechanical durability
When the capacitor is tested in accordance with the provisions of Article 4.6.20, it shall meet the following requirements: a. The dielectric withstand voltage shall comply with the provisions of Article 3.9, b. The contact resistance shall not exceed 0.01α;
c. Unless otherwise specified, the deviation of the relationship curve between the change in capacitance and the rotation of the rotor from the straight line shall not exceed 10%, and there shall be no reversal in direction,
d. The torque at room temperature shall comply with the provisions of Article 3.11.1. 3.24 Solderability (all soldered leads) After the capacitor is tested in accordance with the provisions of Article 4.6.21, at least 95% of the impregnated surface of the lead shall be covered by a new smooth solder layer, and the remaining 5% of the lead surface shall only show pinholes or spots, which cannot be concentrated in one place. Exposed base metal and places where solder stains fail to cover the original coating are signs of poor solderability and should be the cause of failure. In case of dispute, the percentage of area points with pinholes or spots shall be determined by comparing the actual measurement of these areas with the total area. 3.25 Marking
Capacitor marking shall include model, date, batch code and manufacturer's code or trademark. The marking shall not be placed on the mounting surface, and there shall be no spacing between the symbols that make up the model; if the area is limited, the model name may be marked on two lines. In this case, the model name shall be separated between the category and characteristic code and marked on two lines. For example: JCWG26
After all tests, the marking shall remain clear. 3.26 Processing quality
Capacitor processing quality shall be consistent. There shall be no corrosion, cracks, rough edges, notches or other defects that affect life, usability and appearance.
3.26.1 Welding
The flux used for welding shall be rosin, rosin and alcohol or rosin and turpentine. Acids or acid salts shall not be used in the preparation for soldering or during soldering; however, acid salts are permitted for pre-tinning electrical connections and for tinning or soldering mechanical connections not intended for electrical wiring. In any case, acid salts shall not be used where they can come into contact with insulating materials unless they are removed during the process. After using acids or acid salts, they shall be completely neutralized and removed immediately. All excess solder shall be removed.
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. When there is no other provision in the contract or order, the contractor may use any other equipment of its own that is suitable for completing the inspections specified in this specification. However, equipment not approved by the relevant competent authorities is excluded. The relevant competent authorities reserve the right to conduct inspections on any inspection items specified in this specification as long as they deem it necessary to ensure that the supply and use meet the specified requirements. 4.1.1 Test equipment and inspection tools
The contractor shall establish and maintain test equipment and inspection tools with sufficient accuracy, quality and quantity to carry out the required inspections. A calibration system that complies with the regulations shall be established and maintained to control the accuracy of the test equipment. 4.2 Inspection categories
The inspection categories specified in this specification are as follows:
a. Identification inspection (see Article 4.4);
b. Quality consistency inspection (see Article 4.5): 4.3 Inspection conditions
Unless otherwise specified, all inspections shall be carried out under the standard atmospheric conditions for the tests specified in GJB360.1 "General Requirements".
4.4 Identification inspection
Identification inspection shall be carried out in a laboratory approved by the relevant competent authorities, and the samples used shall be products produced in production using equipment and processes commonly used.
4.4.1 Number of samples
The number of samples for identification inspection shall be as specified in Table 2. 4.4.2 Test Procedure
The samples shall be subjected to the tests specified in Table 2 in the order in which they are tested. All samples shall be subjected to one group of tests and then the samples shall be divided equally into the remaining groups listed in Table 2 and subjected to the tests of each group. Table 2 Qualification inspection
Inspection and test
Temperature shock (as applicable)
Appearance and mechanical inspection 2>3)
Capacitance"
Capacitance change
Insulation resistance 33
Dielectric withstand voltage
Quality factor (Q) 3)
Torque (-55℃, room temperature
+125℃)
Temperature coefficient and capacitance drift
Temperature shock
No stain"
Salt spray (corrosion)
Required clauses
3.1, 3.3 to 3.4.4
and 3.25 to 3.2.6
Test method clause
Number of samples tested
Number of nonconforming products allowed1
Inspection and test
Bushing strength torque
Low temperature storage
Impact (specified pulse)
High frequency vibration
Low pressure
Terminal strength (as applicable)
Resistance to welding heat (only for printed circuit mounting type products)
Mechanical durability
Solderability"
Requirement clause
SJ20032--92
Continued table 2
Test method clause
Note: 1) A sample with one or more defects is counted as one nonconforming product. Number of samples tested
2) If the result of any test makes the marking blurred, only the marking shall be judged as defective. 3) Non-destructive test.
Permitted number of non-conforming products>
4) In the 49 capacitors, one additional sample is included, or in accordance with Appendix A2.2, in the 50 samples, two characteristics or two products with different nominal capacitances each include an additional sample, so that it is possible to replace the samples allowed to fail in 1 group. 5) For sealed products only.
6) For panel mounted products only.
7) All solderable terminals.
4.4.3 Failure
If the number of non-conforming products exceeds the value allowed in Table 2, it shall be a reason for refusing to grant the appraisal approval. 4.4.4 Maintenance of appraisal qualification|| tt||In order to maintain the qualification of qualification, the contractor shall submit a summary of the test results of Group A and Group B to the quality assessment body every 12 months. The summary shall at least indicate the number of qualified batches and the number of unqualified batches; and submit a summary of the test results of Group C, which shall indicate the number and type of samples that failed. The summary shall include the results of those tests completed within the 12 months. If the summary of the test results indicates non-conformity with the requirements of the specification, measures shall be taken to remove the unqualified products from the list of qualified products. Delay in submitting the summary will result in the loss of product qualification. In addition to the regular submission of inspection data, at any time during the 12-month period, when the inspection data indicates that the qualified products do not meet the requirements of the specification, the contractor shall immediately notify the assessment body. If during the reporting week If the production is stopped during the period, a report should still be submitted to prove that the manufacturer still has the ability to produce the product and the necessary equipment.
4.5 Quality-Consistency Inspection
Quality consistency inspection should include Group A, Group B and Group C inspection. 4.5.1 Batch Inspection
The batch inspection of products should consist of Group A and Group B inspections, and batch inspection is the delivery inspection of products. Except as provided in Article 4.5.2.1.4, the delivery of products that have passed the Group A and Group B inspections shall not be delayed due to the failure of the Group C inspection to obtain results. 7
4.5.1.1 Inspection Batch
SJ20032—92
An inspection batch should consist of all capacitors produced under basically the same conditions, with the same category and characteristics and delivered for inspection at the same time. Capacitors of the same category, produced under basically the same conditions and delivered for inspection at the same time can be composed according to the provisions of Appendix A and are considered as one inspection batch. This provision only applies to Group A and Group B inspections. 4.5.1.1.1 Group A inspection
Group A inspection shall consist of the inspections and tests specified in Table 3 and shall be performed in the order shown. Table 3 Group A inspection
Inspection or test
Temperature shock (as applicable)
Appearance and mechanical inspection
Body dimensions
Design and structure (except body dimensions)
Marking 1
Processing quality
Capacitance
Capacitance change
Insulation resistance (at room temperature)
Dielectric withstand voltage"
Quality factor (Q)
Torque (at room temperature)
Requirement clauses
3.1, 3.4~3.4. 4
3.26,3.26.1
Test Method
4.6.8.1.2.1
Note: 1) Marking defects are determined only based on visual inspection. Defects refer only to unclear, incomplete or incorrect. 2) The dielectric withstand voltage should be carried out during the capacitor rotation process. 4.5.1.1.1.1 Sampling Plan
AQL (Percentage Defective Rate)
100% Inspection
Count sampling and inspection shall be carried out in accordance with the general inspection level of single sampling in GJB179. The acceptable quality level (AQL) shall be as specified in Table 3.
4.5.1.1.1.2 Rejected batches
If an inspection batch is rejected, the contractor may repair the batch to correct its defects or eliminate defective products and resubmit it for re-inspection. The batches resubmitted for re-inspection shall be inspected with stricter inspection. They shall not be submitted for acceptance until the reasons for rejection are found out or corrective measures are taken. The re-inspection batch shall be separated from the new batch and shall be clearly marked as a re-inspection batch. 4.5.1.1.2 Group B inspection
Group B inspection shall consist of the test items specified in Table 4 and shall be carried out in the order shown. Group B inspection shall use a test instrument that has been tested for Group A and is in compliance with The number of samples for Group B inspection shall be determined based on the size of the Group A inspection batch. Table 4 Group B inspection
Seal (only for sealed products)
Sleeve strength torque (only for panel mounted
type products)
Weldability (all solderable terminals)
Requirement clause
Test method clause
AQL (percent defective rate)
4.5.1.1.2.1 Sampling plan
SJ20032—92
According to GJB179 - sampling special inspection level S-4, the acceptable quality level (AQL) is as specified in Table 4.
4.5.1.1.2.2 Rejected Lots
If an inspection lot is rejected, the contractor may repair the lot to correct its defects or remove defective products and resubmit it for re-inspection. The lot resubmitted for re-inspection shall be inspected with stricter inspection and shall not be submitted for acceptance before the reasons for rejection or corrective measures are found. The re-inspection lot shall be separated from the new lot and shall be clearly marked as a re-inspection lot. 4.5.1.1.2.3 Handling of Samples
Samples that have been inspected by Group B shall not be delivered according to the contract or order. 4.5.2 Periodic Inspection
Periodic Inspection consists of Group C Inspection.
4.5.2.1 Group C Inspection
Group C Inspection shall consist of the tests specified in Table 5 and in sequence. Group C inspection shall be carried out on samples taken from the batches that have passed Group A and Group B inspections
Table 5 Group C inspection
Group C1
Insulation resistance (at 125°C)
Temperature coefficient and capacitance drift
Temperature shock
Group C2
Torque (at -55°C, +125°C)
Terminal strength (as applicable)
Resistance to soldering heat
Group C3||tt ||Immersion (for sealed products only)
Salt spray (corrosion)
Group C4
Group C5
Low pressure
Low temperature storage
Shock (specified pulse)
High frequency vibration
Group C6
Mechanical durability
4.5.2.1.1 Sampling plan
Requirement clause
Test method clause
The samples shall be tested in accordance with Table 5. The sampling period and the number of samples to be taken shall be as specified in Table 6. For each group, respective samples shall be taken. The number of samples taken for each type shall be proportional to the total number of all types of products in a certain category produced during the respective sampling period. 9
Test group
Group 1
Group 1
Group 1
Group N
Group V
Group V
Note: 1) Each characteristic.
SJ20032—92
Table 6 Sample extraction and the allowed number of non-conforming products Test cycle
1 month
1 quarter
2) Each installation form for each characteristic group. 4.5.2.1.2 Non-conforming products
Number of test samples
If the number of non-conforming products exceeds the number allowed in Table 6, the sampling shall be judged as non-conforming. 4.5.2.1.3 Sample handling
Samples that have been inspected by Group C shall not be delivered according to the contract or order. 4.5.2.1.4 Non-conformity
Number of non-conformities allowed
If a sampling fails to pass the Group C test, the contractor shall take corrective measures on the materials or processes or both materials and processes according to the reasons for non-conformity, and take corrective measures on all products that are repairable and produced under basically the same conditions, with basically the same materials and processes, and are considered to have the same failure mechanism. Before taking corrective measures approved by the appraisal agency, the acceptance of the product should be suspended. After taking corrective measures, the Group C test should be repeated (all items should be tested or the original non-conforming items should be tested at the discretion of the appraisal agency). The Group A and Group B tests can be resumed, but the final acceptance is not allowed until the Group C re-test shows that the corrective measures are effective. If it is still non-conformity after re-testing, the relevant non-conformity and the information on the corrective measures taken should be provided to the relevant competent authorities and the appraisal agency. 4.6 Inspection and test methods
4.6.1 Temperature shock (see clause 3.5)
The capacitor shall be tested in accordance with the provisions of GJB360.7, with the following details: a. Test conditions - A or B (as specified in the detailed specification); except that in step 3, the capacitor shall be tested at the high test temperature specified in the detailed specification ±5°C. b. Measurements before and after cycling - not applicable;
c. After the test, the capacitor shall be visually inspected for cracks, corrosion and loose mechanical connections. 4.6.2 Visual and mechanical inspection
The capacitor shall be inspected to verify whether the materials, design, construction, physical dimensions, marking and processing quality meet the corresponding requirements (see clauses 3.1, 3.3 to 3.4.4 and 3.25 to 3.26.1). 4.6.3 Capacitance (see clause 3.6)
Capacitors shall be measured in accordance with GJB360.31 using a test fixture with protective measures and the following details:
a. Test frequency The maximum and minimum capacitances shall be measured at a frequency of 1MHz±100kHz. b. The accuracy range shall be within ±1% or 0.05pF (whichever is greater). 4.6.4 Capacitance change (see clause 3.7) When the capacitor is adjusted from the minimum capacitance position to the maximum capacitance position and then back to the minimum capacitance position, monitor the rate of change of capacitance by any appropriate method. The rate of change of capacitance as a function of the adjustment change shall be monitored to see if it changes sign. 10
4.6.5 Insulation resistance (see clause 3.8)
SJ20032-92
Capacitors shall be tested in accordance with the provisions of GJB360.28, with the following details a. Test voltage - as specified in the detailed specification; b. Special conditions - the measurement shall be carried out at room temperature and high test temperature, with relative humidity between 20% and 50%. According to the manufacturer's opinion, the measurement can be carried out when the relative humidity reaches 80%. c. Measuring point - when the capacitor is adjusted to the maximum capacitance, the measurement is made between two points insulated from each other; d. Reading time - the insulation resistance value is read immediately after the test voltage is continuously applied for 1 minute. 4.6.6 Dielectric withstand voltage (see clause 3.9)
Capacitors shall be tested in accordance with the provisions of GJB360.27, with the following details: a. The size and type of test voltage - 200% of the DC rated voltage or as specified in the detailed specification. b. Application point of test voltage - capacitor is placed at the maximum capacitance position, and voltage is applied between the terminals. 4.6.7 Quality factor (Q) (see Article 3.10) Capacitors shall be tested in accordance with the provisions of GJB360.32, with the following details: a. Test frequency Unless otherwise specified, the capacitor shall be placed at the maximum capacitance position described in Article 4.6.3, and the Q value shall be measured at a frequency of 100±10MHz;
b. Condition - when measuring, its mounting device shall be assembled close to the capacitor. c. Measurement - the parasitic capacitance generated by the test fixture or connecting wire shall be as small as possible, d. Measurement accuracy - shall be sufficient to ensure the specified minimum Q value. 4.6.8 Torque
4.6.8.1 Rotational torque (see 3.11.1) The torque required for the start and maintenance of the rotor is measured by a gradually applied force sufficient to rotate the rotor at least 50% of the total number of revolutions (the verification test is measured at room temperature, -55-℃, +125+℃, the A group test is measured at room temperature; the C group test is measured at -55-9℃ and +125+).
4.6.8.2 Bushing strength torque (for panel mounted products only) (see 3.11.2) The capacitor shall be installed in the specified hole on the metal plate with a maximum thickness of 3mm. According to the provisions of Table 8, the appropriate torque shall be applied to the nut. The torque of the specified value shall be applied and maintained in the direction of tightening the nut for at least 3s. The torque shall be repeatedly applied to the nut until 5 twists are completed. After the test, the capacitor shall be visually inspected for damage to the bushing, thread stripping or other visible mechanical damage.
Table 8 Torque
4.6.9 Temperature coefficient and capacitance drift (see 3.12) 4.6.9.1 Temperature coefficient
Torque±0.01(Nm)
The capacitor is placed at a position close to 75% of the maximum capacitance, at the temperature specified in Table 9 and a frequency of 1MHz±100kHz111) Use a gradually applied force sufficient to make the mover rotate at least 50% of the total number of revolutions to measure the torque required for the mover to start and maintain rotation (the verification test is measured at room temperature, -55-℃, +125+℃, the A group test is measured at room temperature; the C group test is measured at -55-9℃ and +125+).
4.6.8.2 Shaft sleeve strength torque (only for panel mounted products) (see 3.11.2) The capacitor shall be installed in the specified hole on the metal plate with a maximum thickness of 3mm. According to the provisions of Table 8, apply the appropriate torque to the nut. The torque of the specified value shall be applied and maintained in the direction of tightening the nut for at least 3s. The torque shall be repeatedly applied to the nut until 5 twists are completed. After the test, the capacitor shall be inspected by visual method for damage to the shaft sleeve, thread stripping or other visible mechanical damage.
Table 8 Torque
4.6.9 Temperature coefficient and capacitance drift (see 3.12) 4.6.9.1 Temperature coefficient
Torque±0.01(Nm)
The capacitor is placed at a position close to 75% of the maximum capacitance, at the temperature specified in Table 9 and a frequency of 1MHz±100kHz111) Use a gradually applied force sufficient to make the mover rotate at least 50% of the total number of revolutions to measure the torque required for the mover to start and maintain rotation (the verification test is measured at room temperature, -55-℃, +125+℃, the A group test is measured at room temperature; the C group test is measured at -55-9℃ and +125+).
4.6.8.2 Shaft sleeve strength torque (only for panel mounted products) (see 3.11.2) The capacitor shall be installed in the specified hole on the metal plate with a maximum thickness of 3mm. According to the provisions of Table 8, apply the appropriate torque to the nut. The torque of the specified value shall be applied and maintained in the direction of tightening the nut for at least 3s. The torque shall be repeatedly applied to the nut until 5 twists are completed. After the test, the capacitor shall be inspected by visual method for damage to the shaft sleeve, thread stripping or other visible mechanical damage.
Table 8 Torque
4.6.9 Temperature coefficient and capacitance drift (see 3.12) 4.6.9.1 Temperature coefficient
Torque±0.01(Nm)
The capacitor is placed at a position close to 75% of the maximum capacitance, at the temperature specified in Table 9 and a frequency of 1MHz±100kHz11
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.