This specification specifies the general requirements, quality assurance regulations and test methods for military air dielectric chip type fine-tuning variable capacitors. This specification applies to air dielectric chip type fine-tuning variable capacitors. This type of capacitor is mainly used for high-frequency fine-tuning in electronic equipment. Its operating temperature range is -55~85℃ SJ 20031-1992 General Specification for Air Dielectric Chip Type Fine-tuning Variable Capacitors SJ20031-1992 Standard download decompression password: www.bzxz.net
This specification specifies the general requirements, quality assurance regulations and test methods for military air dielectric chip type fine-tuning variable capacitors. This specification applies to air dielectric chip type fine-tuning variable capacitors. This type of capacitor is mainly used for high-frequency fine-tuning in electronic equipment. Its operating temperature range is -55~+85℃

Military Standard of the Electronic Industry of the People's Republic of China FL5910
SJ20031—92
General specification
for air dielectric vane trimmer variable capacitors
Published on February 1, 1992
China Electronics Industry Corporation
Implementation on May 1, 1992
1 Scope
Military Standard of the Electronic Industry of the People's Republic of China Air dielectric vane trimmer variable capacitors
General specification
for air dielectric vane trimmer variable capacitors
1.1 Subject content
SJ20031—92
This specification specifies the general requirements, quality assurance provisions and test methods for military air dielectric vane trimmer variable capacitors. 1.2 Scope of Application
This specification applies to air dielectric chip type fine-tuning variable capacitors, which are mainly used for high-frequency fine-tuning in electronic equipment. Its operating temperature range is: -55～+85℃. 1.3 Classification
1.3.1 Model
The model composition should be in the following form and marked according to the detailed specifications. JCWWww.bzxZ.net
-Nominal maximum capacity (1.3.1.4)
DC rated voltage code (1.3.1.3)
Category code (1.3.1.2)
Main code (1.3.1.1)
1.3.1.1 Main code
JCW is used to represent military air dielectric chip type fine-tuning variable capacitors. 1.3.1.2 Category code
It is represented by letters and numbers. Generally, the structural type is indicated by only 1 to 2 digits. The letter "D\" is added before the digit for butterfly capacitors, the letter "C" is added before the digit for differential capacitors, and the letter "S" is added after the digit for capacitors with locking devices. 1.3.1.3 DC rated voltage code
Use one letter to indicate it according to Table 1.
Table 1 DC rated voltage
Voltage (V)
China Electronics Industry Corporation Issued on February 1, 1992D
Implemented on May 1, 1992
1.3.1.4 Nominal maximum capacity
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Directly indicated by digits , the unit is pF. If there is a decimal point, use p to represent the decimal point. If the nominal maximum capacitance is 12.9pF, it is expressed as 12p9.
2 Referenced documents
The valid versions of the following documents constitute a 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
GB197-81
GJB179—86
GJB360.1—87
GJB360.2--87
GJB360.587
GJB 360.6-87
GJB 360.7-87
GJB 360.15-87
GJB360.20—87
GJB360.23—87
GJB360.27—87
GJB 360.28-87
GJB360.3187
GJB360.32-87
GJB360.33-87
3 Requirements
3.1 Detailed specifications
Packaging, storage and transportation, pictorial markings
General thread tolerances and fits
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
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
Test methods for electronic and electrical components
Test methods for electronic and electrical components|| |tt||Test methods for electronic and electrical components
Salt spray test
Low pressure test
Moisture resistance test
Temperature shock test
High frequency vibration test
Welding heat resistance test
Impact (specified pulse) test
Dielectric withstand voltage test
Test methods for electronic and electrical componentsInsulation resistance testTest methods for electronic and electrical components
Capacitance test
Test methods for electronic and electrical components
Quality factor (Q) test
Contact resistance test
Test methods for electronic and electrical components
The requirements for each air dielectric chip 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 provided in accordance with this specification shall be products that have been qualified or approved by finalization. 3.3 Materials
The materials shall comply with the provisions of this specification or detailed specifications. When the materials are not clearly specified, the materials that enable the performance of the capacitor to meet the requirements of this specification shall be used. The acceptance and approval of any material cannot replace the acceptance of the product. 3.3.1 Electroplating
When silver plating is used, a corrosion-resistant film shall be provided. 3.4 Design and Structure
The design, structure and physical dimensions of the capacitor shall comply with the provisions (see 3.1). 3.4.1 Threaded Parts
All threaded parts shall comply with the provisions of GB197 after electroplating. 3.4.2 Lead-out Terminals
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The lead-out terminals shall be firmly fixed, and all external terminals shall be soldered or welded. All lead-out terminals used for soldering shall be heat-tinned or tin-coated according to the requirements of relevant standards for welding. 3.4.3 Shafts
The shafts shall be made of metal. The rotor shall be able to rotate freely 360°. 3.4.4 Sleeve of locking capacitor
To prevent the sleeve from rotating in the ceramic base, the sleeve should be fixed by appropriate means. 3.5 Dielectric withstand voltage
When the capacitor is tested in accordance with Article 4.6.2, there should be no signs of damage, arcing or breakdown. 3.6 Low pressure
When the capacitor is tested in accordance with Article 4.6.3, there should be no signs of damage, arcing or breakdown. 3.7 Insulation resistance
When the capacitor is tested in accordance with Article 4.6.4, the insulation resistance should not be less than 100000M. 3.8 Capacitance
When the capacitor is tested in accordance with Article 4.6.5, its minimum capacitance should not be greater than, and its maximum capacitance should not be less than, the specified value (see 3.1). The capacitance range can be wider than the specified range when covering the specified range. 3.9 Quality Factor (Q)
When the capacitor is tested in accordance with 4.6.6, the Q value shall be greater than the specified value (see 3.1). 3.10 Relationship between Capacitance and Angle of Rotation
When the capacitor is tested in accordance with 4.6.7, the change in capacitance as a function of the rotor angle of rotation shall not deviate from the straight line by more than 10% and shall not change sign over the entire adjustment range. 3.11 Contact Resistance
When the capacitor is tested in accordance with 4.6.8, the contact resistance shall not exceed 0.010. 3.12 Torque
When the capacitor is tested in accordance with 4.6.9, its starting and turning torque, locking torque and braking torque shall be within the limits specified in the detailed specification. After the test specified in 4.6.9, there shall be no visible mechanical damage. 3.13 Capacitance Change (at high and low temperatures) When the capacitor is tested as specified in 4.6.10, the capacitance change shall not exceed 0.5% of the initial value or 0.4 pF (whichever is greater).
3.14 Low Temperature Storage
When the capacitor is tested as specified in 4.6.11, there shall be no cracks, loose parts or other visible mechanical damage. 3.15 Temperature Shock
When the capacitor is tested as specified in 4.6.12, there shall be no cracks, loose parts or other visible mechanical damage. 3.16 Salt spray (corrosion)
When the capacitor is tested in accordance with Article 4.6.13, the capacitor shall meet the following requirements: the dielectric withstand voltage shall comply with Article 3.5;
insulation resistance shall not be less than 3000MQ;
capacitance shall comply with Article 3.8;
Q value shall comply with Article 3.9;
contact resistance shall not exceed 0.012;
torque (at 25±5℃) shall comply with the provisions of Article 3.12; 3
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g. The corrosion of the exposed metal surface shall not exceed 10% (fading and loss of gloss alone shall not be a reason for rejection). 3.17 When moisture-resistant
capacitors are tested in accordance with Article 4.6.14, they shall meet the following requirements: dielectric withstand voltage shall comply with Article 3.5;
insulation resistance shall not be less than 50000MQ;
capacitance shall comply with Article 3.8;
contact resistance shall comply with Article 3.11; d.
torque (at 25±5℃) shall comply with Article 3.12: the corrosion of the exposed metal surface shall not exceed 10% (fading or loss of gloss alone shall not be a reason for rejection). f.
3.18 Impact (specified pulse)
When the capacitor is tested according to Article 4.6.15, there should be no intermittent contact or instantaneous arc, open circuit, short circuit or crack, loose parts or other visible mechanical damage for 0.5ms or longer. The change in capacitance should not be greater than 0.2% of the initial value or 0.2pF (whichever is greater).
3.19 High-frequency vibration
When the capacitor is tested according to Article 4.6.16, there should be no intermittent contact or instantaneous arc, open circuit, short circuit or crack, loose parts or other visible mechanical damage for 0.5ms or longer. The change in capacitance should not be greater than 0.2% of the initial value or 0.2pF (whichever is greater).
3.20 Mechanical durability
The number of rotations of the capacitor is 500; 1000; 2500 times. When the capacitor is tested in accordance with Article 4.6.17, the capacitor shall meet the following requirements: a: The dielectric withstand voltage shall meet the requirements of Article 3.5; b. The contact resistance shall meet the requirements of Article 3.11; c. The torque (at 25±5℃) shall meet the requirements of Article 3.12. 3.21 Resistance to welding heat (only for welding leads) When the capacitor is tested in accordance with Article 4.6.18, there shall be no electrical or mechanical damage, the capacitance change shall not exceed 0.2% of the initial value or 0.2pF (the larger value), and the Q value shall meet the requirements of Article 3.9. 3.22 Marking
The capacitor shall be permanently and clearly marked with the model, manufacturer's code or trademark. The marking shall not be placed on the mounting surface, paper labels shall not be used, and other markings that confuse the markings specified in this specification shall be prohibited. After all tests, the markings shall remain clear. There shall be no spacing between the symbols that make up the model. If the area is limited, the model can be marked in two lines. For example: JCW42
3.23 Processing quality
The processing quality of capacitors shall be consistent and shall comply with the requirements of Articles 3.3 to 3.4.4. The edges on metal parts shall be smooth and shall not have defects that affect life, use and appearance. 3.23.1 Welding
Rosin or rosin and alcohol shall be used for welding joints. Corrosive flux may only be used when welding the pole piece to the moving piece or stator support. After welding, the corrosive flux shall be completely neutralized. 3.23.2 Lubrication
The grease shall comply with the provisions of the relevant standards. 4
4 Quality assurance provisions
4.1 Inspection responsibility
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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 stipulation in the contract or order, the contractor may use its own or any other equipment suitable for completing the inspections specified in this specification. However, the 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 classification
The inspection classification specified in this specification is 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".
4.3.1 Adjustment position of capacitors
Unless otherwise specified, the moving plate of the capacitor shall be adjusted to the maximum capacitance position and remain unchanged during the entire test period. 4.4 Identification test
Identification test shall be carried out in a laboratory approved by the relevant competent authorities, and the samples used shall be products produced by the equipment and processes normally used in production.
4.4.1 Number of samples
The number of samples for identification test shall be as specified in Table 2. 4.4.2 Test procedure
The samples shall be subjected to the tests specified in Table 2 and in the order thereof. All samples shall be subjected to Group I test, 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 Identification inspection
Inspection or test
Appearance and mechanical inspection
Dielectric withstand voltage
Low air pressure
Insulation resistance
Capacitance
Quality factor (Q)
Relationship between capacitance and angle
Contact resistance
Requirement clauses
3.1.3. 3~3. 4. 4
3.22~3.23
Test method clauses
Number of samples tested
Allowed number of defective products!
Inspection or test
Capacitance change
(Under high and low temperature conditions)
Low temperature storage
Temperature shock
Salt spray (corrosion)
Resistance to welding heat
(Only for welding leads)
Shock (specified pulse)
High frequency vibration
Mechanical durability
Requirement clauses
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Continued Table 2
Test method clauses
Note: 1) A sample with one or more defects is counted as one defective product only. Number of samples tested
2) If the result of any test makes the mark unclear, only the mark is judged to be defective. The number of unqualified products allowed is 1
3) Among the 37 samples, one backup sample is included to make it possible to replace the samples allowed to fail in the group. 4.4.3 Failure
If the number of unqualified 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
In order to maintain the appraisal qualification, the contractor shall submit a report to the quality appraisal department every 6 months. The agency shall submit a summary of the test results of Group A and Group B, indicating at least the number of qualified batches and the number of unqualified batches; and submit a summary of the test results of Group C, indicating the number and type of unqualified products. The summary shall include the results of those tests completed during this 6-month period. If the summary of the test results indicates that the requirements of the specification are not met, measures should 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 6-month period, when When the inspection data show that the qualified products do not meet the requirements of this specification, the contractor shall immediately notify the inspection agency. If production is stopped during the reporting period, a report shall 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 shall include Group A, Group B and Group C inspections. 4.5.1 Batch inspection
Batch inspection of products shall consist of Group A and Group B inspections. Batch inspection is the delivery inspection of products. Except as specified in 4.5.2.1. Except as provided in Article 4, the delivery of products that have passed the Group A and Group B inspections shall not be delayed due to the lack of results of the Group C inspection.
4.5.1.1 Inspection batch
An inspection batch shall consist of all capacitors produced under substantially the same conditions, of the same category and voltage and delivered for inspection at the same time.
4.5.1.2 Group A inspection
SJ20031—92
Group A inspection shall consist of the inspection and test items specified in Table 3 and shall be carried out in the order shown. 4.5.1.2.1 Sampling plan
Sampling and inspection by attributes shall be carried out in accordance with GJB179 single sampling plan general inspection level I. The acceptable quality level (AQL) shall be as specified in Table 3.
Table 3 Group A Inspection
Inspection or Test
Appearance or Mechanical Inspection
Body Dimensions
Design and Structure (Except Body Dimensions)
Marking"
Processing Quality
Dielectric Withstand Voltage"
Low Pressure
Insulation Resistance
Capacitance
Quality Factor (Q)
Relationship between Capacitance and Rotation Angle
Contact Resistance
Torque (Only at 25±5℃)
Requirement Clauses
3.4~3.4.4
3.22~3.22.2
Note: 1) The defects of the mark are determined only by appearance inspection. 2) The dielectric withstand voltage should be carried out during the rotation of the capacitor. 4.5.1.2.2 Rejected Lots
Test Method Clauses
AQ1. (Percentage of Defective Products)
If an inspection lot is rejected, the contractor may repair the lot to correct its defects or eliminate defective products and resubmit it for re-inspection. The lot resubmitted for re-inspection shall be inspected with stricter inspection. It shall not be submitted for acceptance until the reason for rejection is found out or corrective measures are taken. The re-inspection lot shall be separated from the new lot and shall be clearly marked as a re-inspection lot. 4.5.1.3 Group B Inspection
Group B inspection consists of the test items specified in Table 4 and shall be carried out in the order shown. Group B inspection shall be carried out on samples that have undergone and passed Group A inspection. The number of samples for Group B inspection shall be determined according to the size of the lot for Group A inspection. 4.5.1.3.1 Sampling plan
Unless otherwise specified, the sampling plan shall be in accordance with the provisions of the special inspection level S--4 of the single sampling plan of GJB179, and the acceptable quality level (AQL) value shall be 4.0.
Table 4 Group B inspection
Test items
Resistance to welding heat (only for welding leads)
Moment (-55-℃+85+)
4.5.1.3.2 Rejected batch
Requirement clause
Test method clause
If an inspection batch is rejected, the contractor may repair the batch of products to correct its defects or eliminate defective products and resubmit it for re-inspection. The batch resubmitted for re-inspection shall be inspected with stricter inspection. It shall not be submitted for acceptance before 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. 4.5.1.3.3 Sample Handling
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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
The test items, groups and test periods of Group C Inspection are specified in Table 5 and Table 6. Samples for Group C Inspection shall be taken from the batches that have passed the Group A and Group B inspections.
4.5.2.1.1 Sampling Plan
Samples shall be tested in accordance with Table 5. The sampling period and the number of samples to be taken from each group shall comply with the provisions of Table 6. For each group, its own sample shall be taken. Samples shall be randomly selected from representative products produced during a certain sampling period. If the products produced during the period consist of different types of products, a proportional number of samples shall be taken from each type.
Table 5 Inspection of Group C
Test items
Group C1
Capacitance change (high or low temperature conditions) Low temperature storage
Salt spray (corrosion)
Group C2
Shock (specified pulse)
High frequency vibration
Group C3
Mechanical durability
Requirement clauses
Table 6 Number of sampling and allowable number of unqualified products Test group
Group C1
Group C2
Group C3
Group C4
Number of products
3 months
6 months
6 months
6 months
Number of samples taken
Note: 1) A sample with one or several defects should be counted as an unqualified product. 4.5.2.1.2 Failure
If the number of unqualified products exceeds the requirements of Table 6, the sampling shall be judged as unqualified. 4.5.2.1.3 Sample handling
Samples that have passed the Group C test shall not be delivered according to the contract or order. 4.5.2.1.4 Unqualified
Test method clause
Number of unqualified products allowed1)
If a sampling fails to pass the Group C test, the contractor shall take corrective measures on the material or process or both according to the cause of the unqualified8
SJ20031-92
and take corrective measures for 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 body, the acceptance of the product shall be suspended. After taking corrective measures, the additional samples shall be re-tested for Group C (all items shall be inspected, or the original unqualified items shall be inspected, as determined by the appraisal body). Group A and Group B inspections may be resumed, however, final acceptance is not permitted until Group C re-inspection shows that the corrective actions are effective. If the re-inspection still fails, the relevant information on the failure and the corrective actions taken shall be provided to the relevant competent authorities and appraisal agencies. 4.6 Inspection and test methods
4.6.1 Visual and mechanical inspection
Capacitors shall be inspected to verify whether the materials, design, structure, physical dimensions, marking and processing quality meet the corresponding requirements (see Sections 3.1, 3.3 to 3.4.4 and 3.22 to 3.23.2). 4.6.2 Dielectric withstand voltage (see 3.5)
Capacitors shall be tested in accordance with the provisions of GJB360.27, with the following details: a. The size and type of test voltage - a DC voltage twice the specified DC rated voltage or an AC voltage 1.4 times the specified DC rated voltage (effective value); b. The location of the test voltage application - the test voltage shall be applied between the lead-out terminals of the moving piece and the stator and between the lead-out terminals of the moving and stator pieces that are electrically connected together and the mounting frame; c. The limit value of the surge current - the surge current shall not exceed 50mA; d. Measurement after the dielectric withstand voltage test - after the test, the capacitor shall be inspected by the appearance method to see if there are any signs of damage, arc or breakdown.
4.6.3 Low pressure (see 3.6)
Capacitors shall be tested in accordance with the provisions of GJB360.5, with the following details: Installation method - any. During the test, there should be no external stress that causes the shaft to move; a.
b. Test conditions are as specified (see 3.1); c. Test at low pressure - apply the specified voltage (see Table 1 and the provisions of the detailed specifications) between the moving and stator lead-out terminals of the capacitor and between the moving and stator lead-out terminals electrically connected together and the mounting frame. Time 1min; d. Measurement - after the test, use the visual method to check whether the capacitor has damage, arc or breakdown. 4.6.4 Insulation resistance (see 3.7)
Capacitors should be tested in accordance with the provisions of GJB360.28, and the following details: a. The test voltage is equal to the DC rated voltage or 500V DC voltage (whichever is smaller); b. Measurement point - measurement should be made between the moving and stator lead-out terminals and between the moving and stator lead-out terminals electrically connected together and the mounting frame.
4.6.5 Capacitance (see 3.8)
The minimum and maximum capacitance of the capacitor shall be measured in accordance with the provisions of GJB360.31, with the following details: Test frequency - 1MHz ± 100kHz.
4.6.6 Quality factor (Q) (see 3.9) The capacitor shall be measured in accordance with the provisions of GJB360.32, with the following details: The capacitor shall be placed in the maximum capacitance position, and the Q value shall be measured at a frequency of 1MHz ± 100kHz. 4.6.7 Relationship between capacitance and rotation angle (see 3.10) The capacitor rotor is adjusted to the capacitance position of the minimum capacitance plus about 10% of the maximum capacitance value. Then, the rotor is rotated at 30° per step until it is rotated to a position of about 90% of the maximum capacitance value. Each step shall be measured at a frequency of 1MHz ± 100kHz 9
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. The accuracy of the test equipment should be within ±1%. 4.6.8 Contact resistance (see 3.11)
The capacitor should be tested in accordance with the provisions of GJB360.33. And the following rules: a.
Wiring method - the contact resistance should be measured between the lead-out terminal of the moving piece and the moving shaft; the test current is 0.5A (D.C);
Number of actions before test—none;
Number of test actions———1 time;
Measured on the top.
Number of measurements for each action—3 times. It should be measured near the minimum capacitance, intermediate capacitance and maximum capacitance positions 4.6.9 Torque (see 3.12)
Unless otherwise specified, the torque measurement should be carried out at a temperature of 85+℃25±5℃ and -55-9℃. After the test, the capacitor should be inspected for mechanical damage by visual method. 4.6.9.1 Capacitors without locking devices
Apply a gradually increasing torque to the moving piece, and measure the torque required for starting and maintaining rotation. 4.6.9.2 Locking capacitors
Locked capacitors should be measured in accordance with the provisions of Article 4.6.9.1 when the locking nut is loosened. Then, tighten the locking nut with the torque specified in the detailed specification. The locking nut shall be loosened and tightened 6 times. When tightened, measure the torque required to turn the rotor. 4.6.10 Capacitance change (at high and low temperatures) (see 3.13) The capacitance shall be measured in accordance with 4.6.5, except that the measurement shall be made at a temperature of -55 ± 3 °C and a temperature of 85 ± 3 °C. At each temperature, two consecutive readings taken at intervals of 5 minutes indicate no change in capacitance, and the measured value shall be recorded.
4.6.11 Low temperature storage (see 3.14)
The capacitor shall be exposed to a temperature of 60 ± 5 °C for 24 h. After exposure, inspect the capacitor by visual inspection for cracks, loose parts or other visible mechanical damage.
4.6.12 Temperature shock (see 3.15)
The capacitor shall be tested in accordance with the provisions of GJB360.7, with the following details: a. Test conditions A;
b Measurement after cycle - Check the capacitor for cracks, loose parts or other mechanical damage by appearance method. 4.6.13 Salt spray (corrosion) (see 3.16) The capacitor shall be tested in accordance with the provisions of GJB360.2, with the following details: Test conditions - B;
b. Measurement after exposure - Measure the dielectric withstand voltage, insulation resistance, capacitance, Q value, contact resistance and torque (only under the condition of 25±5℃) according to the provisions of 4.6.2, 4.6.4, 4.6.5, 4.6.6, 4.6.8 and 4.6.9 respectively, and check the capacitor for signs of corrosion by appearance method.
4.6.14 Moisture resistance (see 3.17)
The capacitor shall be tested in accordance with the provisions of GJB360.6, with the following details: Initial measurement - not applicable;
b. Installation - The capacitor shall be fixed on the metal panel according to the normal installation method; Load voltage - not applicable;
Final measurement - Under ambient conditions, after drying for 24 hours, measure the dielectric withstand voltage, insulation resistance, capacitance, contact resistance and torque (only at 25±5℃) in accordance with the provisions of 4.6.2, 4.6.4, 4.6.5, 4.6.8 and 4.6.910
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respectively, and use the appearance method to check whether the capacitor has any signs of corrosion. (In order to provide the user with test data under humid conditions, it can be measured within two hours after leaving the box, but it is not used as the basis for assessment). 4.6.15 Impact (specified pulse) (see 3.18) The capacitor shall be tested in accordance with the provisions of GJB360.23, with the following details: a. Installation - The capacitor shall be fixed in the normal installation method; b. Test conditions - 1;
c. During the electrical load state test, 125% of the specified DC rated voltage (see Table 1 and the provisions of the detailed specification) shall be applied between the moving and fixed lead terminals on half of the samples and between the connected moving and fixed lead terminals and the mounting frame on the other half of the samples;
d. Measurement during and after impact - During the test, instantaneous or intermittent arcs shall be observed. After the test or before removing the capacitor, the capacitance shall be measured again in accordance with the provisions of Article 4.6.5. The capacitor shall be inspected for breakdown, traces of arc, cracks, loose parts and other visible mechanical damage by visual method. A cathode ray oscilloscope or other similar method shall be used as an indicator device to determine electrical damage. 4.6.16 High frequency vibration (see 3.19)
Capacitors shall be tested in accordance with the provisions of GJB360.15, with the following details: a. Sample installation and preparation - The capacitor shall be rigidly mounted on a vibration fixture that shall not have any resonance within its test range. The fixture shall be checked on a vibrator. If any resonant frequency is observed, appropriate steps must be taken to suppress the resonance of the (fixture) structure. During the test, the locking capacitor shall be locked; b. Measurement before vibration - The capacitor shall be placed at a position of approximately 90% of the nominal maximum capacitance and the capacitance shall be measured in accordance with the provisions of Article 4.6.5;
c. Electrical load state - During the test, the capacitor is placed in the position specified in item (b) above, and 125% of the specified DC rated voltage (see Table 1 and the provisions of the detailed specification) is applied between the moving and stator lead-out terminals on half of the samples and between the connected moving and stator lead-out terminals and the mounting frame on the other half of the samples; Test conditions B
Vibration time - 12h;
Vibration direction - The capacitor shall be vibrated for 4h in each of the three mutually perpendicular directions. e. Measurement during and after vibration - During the test, instantaneous or intermittent arcs shall be observed. After the test or before removing the capacitor, the capacitance shall be measured again in accordance with the provisions of Article 4.6.5. The capacitor shall be inspected by visual method for breakdown, traces of arcing, cracks, loose parts or other visible mechanical damage. A cathode ray oscilloscope or other similar method shall also be used as an indicating device for determining electrical damage. 4.6.17 Mechanical durability
The capacitor shall be rotated at a rate of 25 ± 5 times per minute for the number of times specified in the detailed specification (see 3.20 and the provisions of the detailed specification), and shall be rotated back and forth continuously through at least 95% of the capacitance range. After the rotation, the dielectric withstand voltage, contact resistance and torque (only at 25 ± 5°C) shall be measured in accordance with 4.6.2, 4.6.8 and 4.6.9 respectively (see 3.20). 4.6.18 Resistance to welding heat (only for welding leads) (see 3.23) The capacitor shall be tested in accordance with the provisions of GJB360.20 standard, with the following details: Test level B,
Depth of immersion in molten solder -3mm; Cooling time for the final inspection measurement -10min; c.6, and the following rules: initial measurement - not applicable;
b. Installation - the capacitor should be fixed on the metal panel according to the normal installation method; load voltage - not applicable;
Final measurement - under ambient conditions, after drying for 24 hours, measure the dielectric withstand voltage, insulation resistance, capacitance, contact resistance and torque (only at 25 ± 5 ℃) according to the provisions of 4.6.2, 4.6.4, 4.6.5, 4.6.8 and 4.6.910
SJ20031--92
respectively, and use the appearance method to check whether the capacitor has any signs of corrosion. (In order to provide the user with test data under humid conditions, it can be measured within two hours after leaving the box, but it is not used as the basis for assessment). 4.6.15 Impact (specified pulse) (see 3.18) Capacitors shall be tested in accordance with the provisions of GJB360.23, with the following details: a. Installation - The capacitor shall be fixed in the normal installation method; b. Test conditions - 1;
c. During the electrical load state test, 125% of the specified DC rated voltage (see Table 1 and the provisions of the detailed specification) shall be applied between the moving and fixed lead terminals on half of the samples and between the connected moving and fixed lead terminals and the mounting frame on the other half of the samples;
d. Measurement during and after impact - During the test, instantaneous or intermittent arcs shall be observed. After the test or before removing the capacitor, the capacitance shall be measured again in accordance with the provisions of Article 4.6.5. The capacitor shall be inspected for breakdown, arc traces, cracks, loose parts and other visible mechanical damage by visual method. A cathode ray oscilloscope or other similar methods shall be used as an indicator device to determine electrical damage. 4.6.16 High frequency vibration (see 3.19)
Capacitors shall be tested in accordance with the provisions of GJB360.15, with the following details: a. Sample installation and preparation - The capacitor shall be rigidly mounted on a vibration fixture that shall not have any resonance within its test range. The fixture shall be checked on a vibrator. If any resonant frequency is observed, appropriate steps must be taken to suppress the resonance of the (fixture) structure. During the test, the locking capacitor shall be locked; b. Measurement before vibration - The capacitor shall be placed at a position of approximately 90% of the nominal maximum capacitance and the capacitance shall be measured in accordance with the provisions of Article 4.6.5;
c. Electrical load state - During the test, the capacitor is placed in the position specified in item (b) above, and 125% of the specified DC rated voltage (see Table 1 and the provisions of the detailed specification) is applied between the moving and stator lead-out terminals on half of the samples and between the connected moving and stator lead-out terminals and the mounting frame on the other half of the samples; Test conditions B
Vibration time - 12h;
Vibration direction - The capacitor shall be vibrated for 4h in each of the three mutually perpendicular directions. e. Measurement during and after vibration - During the test, instantaneous or intermittent arcs shall be observed. After the test or before removing the capacitor, the capacitance shall be measured again in accordance with the provisions of Article 4.6.5. The capacitor shall be inspected by visual method for breakdown, traces of arcing, cracks, loose parts or other visible mechanical damage. A cathode ray oscilloscope or other similar method shall also be used as an indicating device for determining electrical damage. 4.6.17 Mechanical durability
The capacitor shall be rotated at a rate of 25 ± 5 times per minute for the number of times specified in the detailed specification (see 3.20 and the provisions of the detailed specification), and shall be rotated back and forth continuously through at least 95% of the capacitance range. After the rotation, the dielectric withstand voltage, contact resistance and torque (only at 25 ± 5°C) shall be measured in accordance with 4.6.2, 4.6.8 and 4.6.9 respectively (see 3.20). 4.6.18 Resistance to welding heat (only for welding leads) (see 3.23) The capacitor shall be tested in accordance with the provisions of GJB360.20 standard, with the following details: Test level B,
Depth of immersion in molten solder -3mm; Cooling time for the final inspection measurement -10min; c.6, and the following rules: initial measurement - not applicable;
b. Installation - the capacitor should be fixed on the metal panel according to the normal installation method; load voltage - not applicable;
Final measurement - under ambient conditions, after drying for 24 hours, measure the dielectric withstand voltage, insulation resistance, capacitance, contact resistance and torque (only at 25 ± 5 ℃) according to the provisions of 4.6.2, 4.6.4, 4.6.5, 4.6.8 and 4.6.910
SJ20031--92
respectively, and use the appearance method to check whether the capacitor has any signs of corrosion. (In order to provide the user with test data under humid conditions, it can be measured within two hours after leaving the box, but it is not used as the basis for assessment). 4.6.15 Impact (specified pulse) (see 3.18) Capacitors shall be tested in accordance with the provisions of GJB360.23, with the following details: a. Installation - The capacitor shall be fixed in the normal installation method; b. Test conditions - 1;
c. During the electrical load state test, 125% of the specified DC rated voltage (see Table 1 and the provisions of the detailed specification) shall be applied between the moving and fixed lead terminals on half of the samples and between the connected moving and fixed lead terminals and the mounting frame on the other half of the samples;
d. Measurement during and after impact - During the test, instantaneous or intermittent arcs shall be observed. After the test or before removing the capacitor, the capacitance shall be measured again in accordance with the provisions of Article 4.6.5. The capacitor shall be inspected for breakdown, arc traces, cracks, loose parts and other visible mechanical damage by visual method. A cathode ray oscilloscope or other similar methods shall be used as an indicator device to determine electrical damage. 4.6.16 High frequency vibration (see 3.19)
Capacitors shall be tested in accordance with the provisions of GJB360.15, with the following details: a. Sample installation and preparation - The capacitor shall be rigidly mounted on a vibration fixture that shall not have any resonance within its test range. The fixture shall be checked on a vibrator. If any resonant frequency is observed, appropriate steps must be taken to suppress the resonance of the (fixture) structure. During the test, the locking capacitor shall be locked; b. Measurement before vibration - The capacitor shall be placed at a position of approximately 90% of the nominal maximum capacitance and the capacitance shall be measured in accordance with the provisions of Article 4.6.5;
c. Electrical load state - During the test, the capacitor is placed in the position specified in item (b) above, and 125% of the specified DC rated voltage (see Table 1 and the provisions of the detailed specification) is applied between the moving and stator lead-out terminals on half of the samples and between the connected moving and stator lead-out terminals and the mounting frame on the other half of the samples; Test conditions B
Vibration time - 12h;
Vibration direction - The capacitor shall be vibrated for 4h in each of the three mutually perpendicular directions. e. Measurement during and after vibration - During the test, instantaneous or intermittent arcs shall be observed. After the test or before removing the capacitor, the capacitance shall be measured again in accordance with the provisions of Article 4.6.5. The capacitor shall be inspected by visual method for breakdown, traces of arcing, cracks, loose parts or other visible mechanical damage. A cathode ray oscilloscope or other similar method shall also be used as an indicating device for determining electrical damage. 4.6.17 Mechanical durability
The capacitor shall be rotated at a rate of 25 ± 5 times per minute for the number of times specified in the detailed specification (see 3.20 and the provisions of the detailed specification), and shall be rotated back and forth continuously through at least 95% of the capacitance range. After the rotation, the dielectric withstand voltage, contact resistance and torque (only at 25 ± 5°C) shall be measured in accordance with 4.6.2, 4.6.8 and 4.6.9 respectively (see 3.20). 4.6.18 Resistance to welding heat (only for welding leads) (see 3.23) The capacitor shall be tested in accordance with the provisions of GJB360.20 standard, with the following details: Test level B,
Depth of immersion in molten solder -3mm; Cooling time for the final inspection measurement -10min; c.
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