Some standard content:
National Standard of the People's Republic of China
General Specification for Vacuum Capacitors
General Specification for Vacuum Capacitors1 Subject Content and Scope of Application
1.1 Subject Content
GB/T3788-1995
Replaces GB378883
CB 4778--84
This standard specifies the technical requirements and test methods for vacuum capacitors, as well as the requirements for inspection rules, marking, packaging, transportation and storage.
1.2 Scope of Application
This standard applies to the design, production and use of fixed or variable vacuum capacitors with ceramic or glass shells (hereinafter referred to as capacitors).
2 Reference Standards
Packaging, Storage and Transportation Pictorial Marking
GB 191
GB2421 General rules for basic environmental testing procedures for electric and electronic products GB2423.1 Basic environmental testing procedures for electric and electronic products Test A: Low temperature test method GB2423.2 Basic environmental testing procedures for electric and electronic products Test B High temperature test method GB2423.3 Basic environmental testing procedures for electric and electronic products Test Ca Steady state damp heat test method GB2423.6 Basic environmental testing procedures for electric and electronic products Test Eb, impact test method Basic environmental testing procedures for electric and electronic products Test Fc: Vibration (sine wave) test method GB 2423. 10
GB 2423. 21
GB 2423. 22
Basic environmental testing procedures for electric and electronic products Test M: Low pressure test method Basic environmental testing procedures for electric and electronic products Test N: Temperature change test method GB2829 Periodic inspection counting sampling procedures and sampling tables Electrical terminology Basic terminology
GB 2900,1
CB2900.16 Electrical terminology Power capacitors GB/T4857.5 Drop test method for packaging and transport packages GB/T4857.17 General principles for compiling performance test outlines for packaging and transport packages GB/T4857.18 Quantitative data for compiling performance test outlines for packaging and transport packages GB/T4857.19 Information record for circulation test of packaging and transport packages GB 6591 Capacitors and resistors for electronic equipment terminology 3 Terms
3.1 The following terms and definitions are used in this technical condition. Other terms and definitions in this technical condition shall be in accordance with the provisions of GB2900.1, GB2900.16 and GB 6591.
3.2 Peak test voltage peak test voltage Approved by the State Technical Supervision Week on December 8, 1995 and implemented on August 1, 1996
CB/T 3788—1995
The physical basis for measuring the dielectric withstand voltage strength of capacitors under specified conditions. 3.3 Frequency characteristic curve frequencychiaraeteristiccurve The relationship between RF peak operating voltage, RF operating current and frequency under given capacitance. 3.4 Static capacitance characteristic curve staticcapncitance characteristic curve The relationship between the static capacitance of a variable capacitor and its number of rotations or pulling distance under non-operating conditions. 3.5 Electric natural resonant frequency electric natural resonant frequency The critical frequency at which the impedance of a capacitor changes from capacitive to inductive. 3.6 Maximum rotating torque or pulling force maxcimumrotatingtorqueorpuilingforee The maximum value of the rotating torque or pulling force required to adjust the capacitance of a variable capacitor within the range of its capacitance. 4 Classification of capacitors
4.1 Capacitors are divided into four categories:
Fixed glass vacuum capacitors;
Variable glass vacuum capacitors;
Fixed ceramic vacuum capacitors;
Variable ceramic vacuum capacitors.
4.2 Types of vacuum capacitors
The types of vacuum capacitors are named as follows:
Maximum RF current (effective value), A
RF peak working voltage.kV;
-Maximum capacitance, PF;
Capacitor code.
Among them, the capacitor codes include the following; CKB-
Fixed glass vacuum capacitors:
CKHHB-Variable glass vacuum capacitors;
CKT-Fixed ceramic vacuum capacitors;
CKTB-Variable ceramic vacuum capacitors.
Note: For variable capacitors, add \I\ after the code. 4.3 Capacitor marking
Capacitor marking shall comply with the current provisions of product standards. Ambient temperature for use
Under natural cooling conditions, the ambient temperature for container use is: -55~~70℃. 4.5 Design and structure
The rotation number or pulling distance shall comply with the provisions of product standards or drawings. 5 Technical requirements
5.1 Product standards
All requirements for capacitors shall comply with the provisions of this technical condition and the corresponding product standards. If there is a conflict between this technical condition and the requirements of the product standard, the product standard shall prevail.
5.2 Structural requirements
GB/T 3788—1995
5.2.1 The surface of the capacitor shall be clean. The external metal surface shall be smooth and have anti-corrosion properties. There shall be no metal flow marks at the ceramic and metal seals, and there shall be no devitrification, bubbles, scars and evaporation on the glass that affect normal operation. 5.2.2 The sealing parts of the capacitor should be firm, reliable and sealed, and the mechanical structure should be firm without deformation and damage. 5.2.3 The overall dimensions and installation dimensions of the capacitor should comply with the provisions of the product standards. 5.2.4 The quality of the capacitor should comply with the provisions of the product standards. 5.3 Capacitance
5.3.1 Capacitance of fixed capacitors
The nominal value of the capacitance should comply with the provisions of the product standards. When the nominal value of the capacitor is greater than 50pF, the allowable deviation is ±5%; when it is 5~50pF, the allowable deviation is ±10%.
5.3.2 Capacitance of variable capacitors
The nominal value of the maximum capacitance and the minimum capacitance at the specified position should comply with the provisions of the product standards. The maximum capacitance allowable deviation is ±5%, and the minimum capacitance value is less than or equal to the nominal value. 5.4 Power frequency peak test voltage
The power frequency peak test voltage should comply with the provisions of the product standards and shall not be less than 1.4 times the RF peak working voltage. 5.5 DC leakage current
DC leakage current is not greater than 15μA.
5.6 Capacitance temperature coefficient
Capacitance temperature coefficient is less than or equal to 100×10-8/℃. 5.7 Dielectric loss
Dielectric loss is less than or equal to 10×10*.
5.8 Frequency characteristic curve
Frequency characteristic curve shall comply with the provisions of product standards. 5.9 Maximum RF current
The maximum RF current rating (effective value) shall comply with the provisions of product standards. Under natural cooling conditions, when the capacitor is passed with this current, the temperature of the ceramic (or glass) and metal sealing part shall not exceed 150℃. 5.10 Capacitance characteristic curve
The change of the capacitor to the number of rotations or pulling distance shall be within the range of ±10% of the capacity characteristic curve. 5.11 Maximum torque or pulling force
The maximum torque or pulling force shall comply with the provisions of product standards. 5.12 Mechanical life
The mechanical life of the capacitor is 5000-20000 times, and the specific requirements shall comply with the provisions of the product standards. 5.13 Temperature change
After the capacitor is tested according to 6.13, the appearance structure and power frequency peak test voltage shall comply with the requirements of 5.2.2 and 5.4 respectively. 5.14 Vibration
After the capacitor is tested according to 6.14, the structural requirements, capacitance, power frequency peak test voltage, DC leakage current, maximum torque or tension and marking shall comply with the requirements of 5.2~5.5, 5.11 and 8.1 respectively. 5.15 Collision
After the capacitor is tested according to 6.15, the structural requirements, discharge capacity, power frequency peak test voltage, DC leakage current, maximum torque or tension and marking shall comply with the requirements of 5.2~5.5, 5.11 and 8.1 respectively. 5.16 After the low-temperature capacitor is tested according to 6.16, the dimensions, capacitance, peak test voltage, DC leakage current, maximum torque or tension and marking shall meet the requirements of 5.2.3, 5.3~5.5, 5.11 and 8.1 respectively. 5.17 High-temperature capacitor connection CB/T3788-1995 6.17 Test room, external dimensions, power frequency peak test voltage, first leakage current, maximum torque or pull month and mark shall comply with the requirements of 5.2.3, 5.3~5.5, 5.11 and 8.1 respectively. 5.18 Steady heat
After the capacitor is tested in accordance with 6.18, the external dimensions, capacitance, power frequency peak test voltage, DC current, maximum torque or pull month and mark shall comply with the requirements of 5.2.3, 5.3~5.5, 5.11 and 8.1 respectively. 5.19 Low pressure
For capacitors that can work stably in low pressure environment, after the test in accordance with 6 and 19, the upper frequency peak test voltage shall comply with the requirements of 5.1.
5.20 Electrical inherent resonant frequency
The electrical inherent resonant frequency shall comply with the provisions of the product standard. For variable capacitors, the electrical frequency at the maximum capacitance or minimum capacitance shall be measured respectively.
6 Test methods
6.1 General test rules
6.1.1 The various test methods for capacitors shall comply with the provisions of this technical condition and the corresponding product standard. If the test conditions and test methods are not specified in this technical condition, the test conditions and test methods of certain capacitor parameters shall be specified in the product standard when necessary. 6.1.2 The test shall be carried out under normal atmospheric conditions specified in (H2421). 6.1.3 The voltage variation range of the AC power supply shall be within 25%, and the frequency variation range shall be within +2% to ensure that the test equipment can work normally. 6.1.4 The accuracy of the DC meter of the test equipment shall not be lower than Class 1.0, and the accuracy of the AC meter shall not be lower than Class 1.5. In order to improve the measurement accuracy, the selection of the range of the electrical measuring instrument should make the indication of the measured value more than one-third of the full range. 6.1.5 When testing the capacitance parameters, it is allowed to replace the electrical measuring instrument with an indicating instrument or other sensitive elements. The error of these indicating instruments or sensitive elements shall not exceed the error of the electrical measuring instrument. 6.1.6 In order to protect the test equipment or the meter from sudden overload, various protection devices are allowed to be used on the test equipment. However, it shall not affect the test conditions. 6.1.7 During the test, the insulation resistance of the connecting wire from the capacitor lead-out terminal to the test equipment and the surrounding circuit should be no less than ten 500M16.1.8 High-voltage test equipment should meet the following requirements: The external charger should be grounded: The voltage regulating device should ensure that the voltage changes evenly; No electric shock and corona phenomena should be generated within the test voltage; d. There should be radiation protection measures for the human body; If there is an external electromagnetic field or interference with other equipment or instruments, shielding measures should be taken. 6.2 Structural requirements 6.2.1 The structure and appearance of the capacitor should be inspected by the daylight method to meet the requirements of 5.2.1 and 5.2.2. 6.2.2 The external dimensions and installation dimensions should be inspected with tools with an error of no more than 0.02mm, which should meet the requirements of 5.2.3. 6.2.3 Quality The error should not exceed 0, 01 kg floor scale, the inspection mass shall comply with the requirements of 5.2.4. 6.3 Capacitance
6.3.1 The capacitance of the capacitor measured by the electric penetration measuring instrument shall comply with the requirements of 5.3, and the measurement error shall meet the following requirements: The capacitance range of the measured capacitor is: 5~50pF. The measurement error is ±1pF 50~100pF. The measurement error is ±2%: When it is greater than 100pF, the measurement error is ±1%. 6.3.2 For variable capacitors, the moving end of the capacitor is grounded. 6.3.3 The test frequency is 1kHz.
6.4 Upper frequency peak test voltage
GB/T 3788—1995
6.4.1 The power frequency peak test voltage shall be measured with an instrument that conforms to the circuit diagram shown in Figure 1 and shall comply with the requirements of Article 5.4. R.
50Hz, 230
Figure 1 Power frequency peak test voltage test circuit diagram, s.
Fuse:
PAC ammeter;
Protective resistor:
AC voltmeter:
Autotransformer
T frequency high-voltage test transformer;
Tested capacitor:
Joint sample resistor:
Tested capacitor short-circuit indicator
High-voltage voltmeter.
R, select according to formula (1):
RI + Ra ko ..
Where: k=1k8/kV;
R,—T2 DC resistance of secondary coil, kn;
1 Frequency peak test voltage (read from meter), kV. 6.4.2 Connect the capacitor to be tested to the test instrument in a dark room. 6.4.3 Raise the voltage from zero to the rated value of the test voltage evenly within 1 minute. If sparking occurs during the voltage increase process, the specified sparking voltage should not be lower than ? 0% of the test voltage. After reaching the rated value, start timing and stabilize for 5tmin. If sparking occurs within 1min, the specified time is allowed to be extended to 6min, but no sparking, glowing, etc. are allowed within the last 5min. Note: Glow refers to the fixed or moving red light that appears near the electrode in the electroporator. The purplish or light blue fluorescence that appears in the capacitor (especially at the seal) cannot be considered as glow.
GB/T3788-1995
6.4.4 Reduce the voltage to the minimum, cut off the power supply, and discharge the capacitor. 6.5 DC leakage current
6.5.1 The DC leakage current measured by an instrument that conforms to the circuit diagram shown in Figure 2 shall comply with the requirements of Article 5.5. C
Figure 2 Leakage current test circuit
Capacitor under test,
Current limiting resistor, resistance value is selected according to 300kn/kV: Effective current limiting resistor:
"Electrostatic high voltage meter,www.bzxz.net
Current source,
Filter capacitor:
Electrostatic switch:
True current ammeter:
Push button switch.
6.5.2 Before the test, measure the power frequency peak value according to 6.4.1. The test voltage should meet the requirements of 5.4. 6.5.3 The above Connect the qualified capacitor to the test instrument. 6.5.4 Increase the voltage gradually so that the voltage across the capacitor is a DC voltage corresponding to the rated RF peak working voltage. At this time, read the DC leakage current value.
6.5.5 Reduce the voltage to zero. Cut off the power supply and discharge the capacitor. 6.5.6 Change the direction of the container electrodes and repeat steps 6.5.3 to 6.5.5. Note: (ii) Before the test, it is allowed to clean the outer surface of the capacitor; pay attention to the safety issues of capacitor breakdown during the test. 6 Capacitance temperature coefficient
6.6.1 Measure the capacitance at the initial overflow temperature t: 6.6.2 Place the capacitor in a constant temperature box and raise the temperature to t. Maintain this temperature. When the capacitance of the capacitor remains unchanged, measure the capacitance coefficient at this temperature C
6.6.3 Calculate the capacitance temperature coefficient of the capacitor using formula (2). These should comply with the requirements of Article 5.6. a
GB/T 3788—1995
Note, (t-tg) is not less than 20℃, t is generally not less than 100r:. 6.7 Dielectric loss
6.7.1 The dielectric loss measured by a dielectric loss meter or corresponding instrument should comply with the requirements of Article 5.7. 6.7.2 For variable core capacitors, the moving electrode is grounded during the test, the capacitance is adjusted to the minimum value position, and when the minimum capacitance is less than 10pF, the test is conducted at 10pF.
6. 7. 3 The test frequency is 1 MIHIz. 6.8 Frequency characteristic curve
6.8.1 Determine the frequency corresponding to the maximum peak working voltage H and the maximum RF current under a given capacitance band (the variable capacitor takes the maximum, middle and minimum capacitance), that is, the maximum reactive power frequency, as shown in formula (3). fumar
Where: famx\maximum reactive power frequency, MHz; F
-maximum RF current (effective value), A; C mk-m maximum peak voltage, kV; the capacitance of the capacitor under test is recorded as +PF.
2251mx
6.8.2 Connect the capacitor with given capacitance to the instrument in accordance with the circuit diagram shown in Figure 3. Figure 3 Color characteristic curve test circuit diagram
In the figure: G
Test bench commercial frequency exciter;
Test bench final stage power amplifier tube,
High frequency choke;
Tanker tuning capacitor:
Road closure resonator:
Tested capacitor:
Pole DC limit:
High frequency bypass capacitor;
High peak voltage meter.
6.8.3 In the frequency range of fk, apply the maximum RF peak working voltage to both ends of the capacitor, and after 30 minutes of emergency, disconnect the power supply: immediately measure the temperature of the capacitor sealing part, which should meet the requirements of Article 5.9, and directly read the maximum RF peak value from the table P.Change the test frequency, and convert the RF working current I by formula (4), so as to obtain the relationship between 1 and frequency I
Where: 1—RF working current (effective value), A: f
Test frequency, MHz:
C—Capacitance of the capacitor under test·pF.
(4)
6.8.4 In the frequency range of f≥fq, make the current flowing through the two ends of the capacitor the maximum RF current Imx. After stabilization for 30 minutes, cut off the power supply and immediately measure the temperature of the sealing part of the capacitor. It should meet the requirements of Article 5.9. From Table P, read the corresponding RF working voltage, change the test frequency, and repeatedly read the RF working voltage value to obtain the relationship between mountain and frequency, or convert the value by formula (5), so as to obtain the relationship between heart and frequency:
Where: ---RF peak working voltage, kVC--capacitance of the capacitor under test, pF, f--test frequency, MHz.
6.8.5 Based on the above data, draw the frequency characteristic curve on the double logarithmic coordinate paper. -(6)
6.8.5.1 In the frequency range of f3fa:lux, the maximum radiated peak operating voltage is independent of f and is a straight line parallel to the horizontal axis. The relationship between the RF operating current I and is a rising straight line, which is expressed by formula (6): CUm +lgf
Igl = lg
6.8.5.2 In the frequency range of f3fa:lux, the maximum radiated current I is independent of f and is a straight line parallel to the horizontal axis. The relationship between the RF operating voltage and is a falling straight line, which is expressed by formula (7): (el) g 223/mm
6.9 Maximum RF current
6.9.1 Given capacitance (the capacitance of the variable capacitor is the maximum, middle and minimum capacitance respectively). (7
6.9.2 Test according to t, 8.4. Within the frequency range of fgmm, make the current flowing through the two ends of the capacitor the maximum radio frequency current I. After stabilization for 30 minutes, cut off the power supply and immediately measure the capacitance of the ceramic (or glass) and metal joints. It should meet the requirements of 5.9. 6.10 Capacitance characteristic curve
6.10.1 For each capacitor of the same specification and model in a group (the number is more than 5.1), measure the static capacitance value corresponding to each point of the rotation number or pulling distance within its capacitance variation range. 6.10.2 Calculate the arithmetic mean of the static capacitance corresponding to each point of the rotation number or pulling distance of the group of capacitors. 6.10.3 Based on the above data, draw the capacitance characteristic curve on the coordinate paper. 6.10.4 Check that the change of the capacitance of a single capacitor with respect to the rotation number or pulling distance should meet the requirements of 5.10. 6.11 Maximum rotation force or pulling force
GB/T 3788
6.11.1 Fix the measured capacitor vertically or horizontally on a test stand with a torque or tension measuring device. 6.11.2 Adjust the capacitance from large to small. The maximum torque or tension measured shall meet the requirements of 5.11. 6.12 Mechanical survival
6.12.1 Fix the measured capacitor vertically on a test stand with a rotation or tension measuring device. 6.12.2 Adjust the rotation speed so that the frequency of the whole range of capacitance change is 2~4 times/minl. 6.12.3 Start the rotating mechanism and adjust the capacitor from 0.075 times of the number of rotations or the pulling distance to 0.925 times of the number of rotations: and then vice versa, complete the whole change.
6.12.4 Record the number of times the electric penetration changes in the whole process, which should meet the requirements of Article 5.12. 6.12.5 After the test, the overall dimensions, electric penetration, power frequency peak test voltage, DC leakage current and maximum rotation force or pulling force shall meet the requirements of Article 5.2.3, Article 5.3~5.5 and Article 5.11 respectively. 6.13 Temperature change
6.13.1 Carry out the test according to Test Na in GB2423.22, and stipulate: T: -55C1
7+125℃ (glass capacitor)
155℃ (ceramic capacitor),
Number of cycles: 3 times
Exposure duration t: 30min;
Transfer time 12+3min.
6.13.2 After the appliance returns to room temperature, it shall comply with the requirements of 5.13. 6.14 Vibration
6.14.1 The variable capacitor is placed at the maximum nominal capacitance. 6.14.2 According to the relevant provisions of (GL32423.10), the test is carried out in the axial and radial directions of the container, and the following provisions are made: Vibration direction: in accordance with the product standard;
Frequency range: 5~~55Hz:
Amplitude: 20m/s or in accordance with the product standard; Duration: in accordance with the product standard.
6.14.3 After the test, it shall comply with the requirements of 5.14. 6.15 Collision
6.15.1 The variable capacitor is placed at the maximum nominal capacitance value position. 6.15.2 Carry out the test in the axial and radial directions of the capacitor according to the relevant provisions of (;R2423.6, and stipulate: peak speed: 100 n/s;
pulse duration: 16 ms;
collision avoidance number: 1600 times.
6.15.3 Avoid the requirements of 5.15 after the test. 6. 16 Low salt
6.16.1 Carry out the test according to the provisions of test Ab in (GH2423.), and stipulate: temperature: -55℃ +
duration: 2h or as specified in the product standard. 6.16.2 After the capacitor returns to room temperature, it shall meet the requirements of 5.16. 6.17 High temperature
6.17.1 Carry out the test according to GL2423.2T test Bb, and stipulate: temperature: 70;
duration: 2h or as specified in the product standard. GB/T 3788—1995
6.17.2 After the capacitor returns to room temperature, it shall comply with the requirements of 5.17. 6.18 Steady sensible heat
6.18.1 Test according to GB 2423.3, and specify the severity level as 48 h. 6.18.2 After the capacitor returns to room temperature, it shall comply with the requirements of 5.18. 6.19 Low pressure
6.19.1 Test according to GB2423.21, and specify the severity level as specified in the product standard. 6.19.2 After the test, it shall comply with the requirements of 5,19 6.20. Electrical inherent resonance frequency
6.20.1 The electrical inherent resonance frequency measured by the instrument in accordance with the circuit diagram shown in Figure 4 shall comply with the requirements of Article 5.20. G.
Figure 4 Electrical inherent resonance frequency test circuit diagram In the figure: G,——sweep frequency meter:
U, pick-up detector,
R,——resistor,
Cx——capacitor to be measured.
6.20. 2 Calibrate the instrument
6. 20. 3 Set the frequency marker switch to 10 MHz and the frequency marker gain to the appropriate position. The height of the frequency characteristic curve on the sweep frequency meter screen should be greater than two-thirds of the screen height, and the frequency marker should be superimposed on the curve. 6.20.4 Insert the probe of the detector detector into the Y-axis input terminal of the sweep frequency meter and connect it to the matching cable connected to the sweep voltage output jack, connect the ground wire, and set the coarse attenuation and fine attenuation to 0. dB, the Y-axis gain is moderate. 6.20.5 Connect the capacitor to be tested to the circuit, 6.20.6 Select the frequency band according to the capacitance value (the variable capacitor takes the maximum, the minimum capacitance takes the minimum), adjust the center frequency knob, and the frequency characteristic curve will show a dip. The frequency corresponding to the deepest dip is the inherent resonant frequency of the capacitor to be tested. 6.20.7 Read roughly at the 10 MHz frequency mark, and then read carefully at 1 MHz. The read electrical inherent resonant frequency value should meet the requirements of Article 5.20. 7 Inspection rules
7.1 Inspection classification
Capacitors are divided into acceptance inspection and routine inspection. 7.2 Acceptance inspection
7.2.1 Acceptance inspection is generally carried out jointly by the manufacturer and the user, or the manufacturer submits the product, and the user inspects the acceptance inspection items and obtains confirmation from both parties. If the unqualified product is the responsibility of the manufacturer, the manufacturer shall be responsible for return and replacement. 7.2.2 Products to be inspected must be stored for no less than 7 days after the production test. Full inspection shall be carried out according to the inspection items and inspection methods specified in Table 1. If any item fails, the unqualified products shall be removed. The batch unqualified rate shall not exceed 7%. If it exceeds 7%, it shall be returned for screening and allowed to be submitted again. If it still exceeds 7%, the batch of products shall be stopped from acceptance. Sequence
7.3 Routine inspection
Appearance size (structural requirements)
GB/T 3788--1995
Inspection items
Appearance quality and structure (structural requirements)
Capacitance
Peak test voltage
True current
Maximum torque or tension
7.3.1 Routine inspection is carried out in the following cases: a. Trial production and finalization of new products. When the structure, material and process changes of capacitors will affect the product performance; b. During normal production, the inspection department of the manufacturer shall inspect each group of items according to the test period in Table 2. Inspection method 6.2.2 6.2.1 7.3.2 The samples for routine inspection are randomly selected from the products that have passed the delivery inspection, and the qualified judgment is made according to the secondary sampling plan of the discrimination level 1 in GB 2829. The inspection items, methods, number of samples and qualified judgment array are shown in Table 2. Table 2
Temperature change
Standard temperature
Test items
Low pressure (if applicable)
Equipment life
Packaging quality
Electrical wear coefficient
Dielectric loss
Frequency characteristic curve
Maximum current
Capacitance sustainability curve
Electrical inherent vibration frequency
Test method
6. 2.3
8. 2. 2 items
Test period
(month)
Number of samples
Determination group
7.3.3 After the inspection, the batch of products judged as unqualified by routine inspection shall not be delivered for use. The manufacturer shall analyze and study the reasons for the unqualified and take measures such as sorting or repairing for all products in this batch. For the products that have been shipped, the manufacturer shall take the initiative to negotiate with the user. GB/T 3788—1995
7.3.4 Products that have been inspected by the first group shall not be delivered for use as qualified products. 8 Marking, packaging, transportation, storage
8.1 Marking
The following markings shall be clearly and firmly affixed to the capacitor: a. Manufacturer's trademark;
b. Capacitor model;
c. Year, month and serial number of manufacture.
8.2 Packaging
8.2.1 The packaging of capacitors should be firm to ensure that they are not damaged during normal transportation and storage. 8.2.2 Inspection method for packaging quality
, the packaged capacitors should be fixed on the car as required, and driven on a third-class highway at a speed of 30-40km/h for 300km, or tested on an equivalent bump test bench. b. The packaged capacitors should be subjected to drop tests according to GB/T4857.5, GB/T4857.17, GB/T4857.18, and GB/T4857.19. The specific requirements shall be in accordance with the product standards. After the test, all items of the inspection and acceptance inspection shall meet the requirements. If the test fails, the reasons shall be analyzed and the packaging quality shall be improved to meet the requirements.
8.2.3 The packaging box shall be accompanied by a certificate of conformity and instructions, and the model and number of the capacitor shall be indicated on the certificate of conformity. 8.2.4 The packaging box should have relevant signs such as "Handle with Care", "Incubate", "Avoid Condensation" in GB 191, and should have a visa indicating the model, number, quantity and date of issue.
8.3 Transportation and Storage
8.3.1 Capacitors must not be randomly collided during transportation and loading and unloading, and should not be placed together with dangerous goods and corrosive items. 8.3.2 The storage temperature of capacitors is -40~~50℃, the relative fade is not more than 80%, and the surrounding air is acid-free and alkaline-free. 8.3.3 If the capacitor has quality problems during storage within five years from the date of delivery, and it is indeed due to manufacturing reasons, the manufacturer shall return and replace it free of charge. Additional Notes:
This standard was proposed by the Ministry of Electronics Industry of the People's Republic of China, and this standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by the State-owned No. 897. The main drafters of this standard are Ai Meiyun, Wu Deren, Liu Jianpai, Lu Mingyan, and Yang Zhenqiu.
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