SJ 20725-1998 Detailed specification for MF18 low temperature temperature compensation thermistor assembly

This specification specifies the technical requirements, quality assurance, inspection methods and delivery preparation of MF 18 type low temperature temperature compensation thermistor components (hereinafter referred to as components). This specification applies to MF 18 type low temperature temperature compensation thermistor components. SJ 20725-1998 MF18 type low temperature temperature compensation thermistor component detailed specification SJ20725-1998 Standard download decompression password: www.bzxz.net

Military standard of the electronics industry of the People's Republic of China FL5911
SJ 20725—1998
Detail specifcation for module at low temperaturefor temperature compensation thermistors for type MF18Published on 1998-03-18
Implemented on 1998-05-01
Ministry of Electronics Industry of the People's Republic of China
Military standard of the electronics industry of the People's Republic of China MF18Detail speciflcation for module at low temperaturefor temprature compensatlon thermistors for type Mr181Scope
1.1Question content
SJ 20725—1998
This specification specifies the technical requirements, quality assurance, inspection methods and delivery preparation of MF18 low-temperature overflow compensation thermistor components (hereinafter referred to as components). 1.2 Scope of application
This specification applies to MF18 low-temperature overflow temperature compensation thermistor components. 2 Reference documents
GB 191-90
Packaging, storage and transportation pictorial marking
GJB360A-96 Test methods for electronic and electrical components 3 Requirements
3.1 Detailed requirements
All requirements of the component shall comply with the provisions of this specification. 3.2 Component structure
The component consists of an enameled manganese copper wire wound fixed resistor Kg and 5 low-temperature thermistors Rt: Re, Re, R, R, and its connection circuit diagram is shown in Figure 1.
The Ministry of Electronics Industry of the People's Republic of China issued KAoNrKAca-1998-03-18
1998 ~ 05 ~ 01 implementation
3.3 Dimensions
SJ 20725 1998
The dimensions of the enameled manganese copper wire wound fixed resistor Rg of the component are shown in Figure 2a, and the dimensions of the low-temperature thermistor parallel component of the component are shown in Figure 2b
ep52-02
@42.2*o.2
55 ± 0.5
25 ± 0.5
SJ 20725 - 1598
20±0.2120±0.2120±0.220±0.213.5±0.5
.1±0.2
3.4 ​​First Article
Products submitted in accordance with this specification shall be products that have passed the first article inspection and approval. 3.5 Performance Characteristics
3.5.1 Operating Temperature Range
25 ± 0.2
55 ± 0.5
The operating temperature range of the component is 20K (235℃) ~ 323K (50℃), and the maximum temperature allowed is 413K (140℃), and the time shall not exceed 2h.
3.5.2 Rated Zero Power Resistance
The rated zero power resistance of the component is 0.5~2.00. The rated zero power resistance of the component shall be measured under the temperature condition of 25±0.1℃.
3.5.3 Zero-power resistance value at liquid nitrogen temperature. The zero-power resistance value of the component in nitrogen is 18.0~20.00.3.5.4 Voltage-current characteristics
The typical voltage-current characteristics of the component in liquid nitrogen are shown in Table 1. Table 1
Voltage V
Current A
3.5.5 Resistance-temperature characteristics
The typical resistance-temperature characteristics of the component are shown in Table 2.27
iKAoNrKAca-
Temperature K
Resistance 0
Electrical value deviation (%)
SJ 20725 -- 1998
Note: In the table, 273K, 90K, 77K, and 20K represent the temperatures of the triple point of water, oxygen, liquid ammonia, and liquid oxygen, respectively. 3.6 Working Environment
The working environment of the module should be below 50℃, and the environment should be air or air with low concentration of hydrogen. The working time in high vacuum should not exceed 60min.
3.7 Steady-state damp heat test
After the test in accordance with 4.6.9, the zero-power resistance value of the module in liquid nitrogen should not change by more than ±0.2%. 3.8 Low pressure
After the test in accordance with 4.6.10 for -30min, the zero-power resistance value of the module in liquid nitrogen should not change by more than ±0.3%. 3.9 Temperature shock
After the test in accordance with 4.6.11, the zero-power resistance value of the module in liquid nitrogen should not change by more than ±0.5%. 3.10 High temperature life
After the test in accordance with 4.6.13, the zero-power resistance value of the module in liquid nitrogen should not change by more than ±0.5%. 3.11 Lead Terminal Strength
After testing in accordance with 4.6.8, the strength of the lead wire solder joint of the low temperature thermistor in the module shall not be less than 45.0N. 3.12 Random Vibration
After testing in accordance with 4.6.14, the module shall have no mechanical damage, and the change of zero power resistance value in liquid nitrogen shall not exceed 0.3%.
3.13 Insulation Resistance
After testing in accordance with 4.6.7, the insulation resistance of the low temperature thermistor in the module shall not be less than 20M2, and the insulation resistance of the manganese wire winding shall not be less than 500MQ. 3.14 Requirements for component selection of components
3.14.1 Rated resistance value of manganese copper wirewound resistor The rated resistance value of enameled manganese copper wirewound resistor is 20.0~21.002. 3.14.2 Low temperature thermistor
3.14.2.1 Rated zero power resistance value
The rated zero power resistance value of each low temperature thermistor is 4.0~10.0013.14.2.2 Zero power resistance limit in liquid nitrogen Low temperature thermistor The zero-power resistance value of each resistor in liquid nitrogen is 2000~50000. 3.14.3 Low-temperature thermistor parallel components
3.14.3.1 Rated zero-power resistance value
The rated zero-power resistance value of low-temperature thermistor parallel components is 1.0~2.002. 3.14.3.2 Zero-power resistance value in liquid nitrogen The zero-power resistance value of low-temperature thermistor parallel components in liquid nitrogen is 500~10000. 3.14.3.3 Voltage-current characteristicswww.bzxz.net
SJ 20725 - 1998
Typical voltage-current characteristics of low-temperature thermistor parallel components in liquid nitrogen are shown in Table 3Table 3
Voltage (V)
Current (mA)
Low-temperature thermistor parallel components that fail the voltage-current test in liquid nitrogen (current increase) are allowed to be repaired once, that is, the unqualified low-temperature thermistor chips are eliminated and replaced with qualified low-temperature thermistor chips, and then the voltage-current test of the parallel components in liquid nitrogen is repeated. If it still fails, it is a defective product. The change in zero-power electric value of the low-temperature thermistor parallel components in liquid nitrogen before and after the voltage-current characteristic test should not exceed 10. 3.15 Marking
Each low-temperature thermistor chip should be clearly marked with the component number, and each low-temperature thermistor parallel component and enameled manganese copper wire-wound resistor component should be marked with the component number. The product number is represented by four digits, the first two digits represent the last two digits of the production year, and the last two digits represent the production calendar week. The packaging bag of the component should be marked with the product name, model, product number, production date and production unit.
3.16 Appearance quality
Components should be processed using methods that can ensure consistent quality. Low-temperature thermistor parallel components should be free of cracks, holes or fragments and other defects that will affect life, usability or appearance: the winding of the enameled manganese copper wire-wound resistor should be uniform and free of other defects that will affect life, usability or appearance. 4 Quality Assurance Provisions
4.1 Inspection Responsibility
Unless otherwise specified, the contractor shall be responsible for completing all inspections specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any inspection items specified in this specification. 4.1.1 Responsibility for Conformity
All products must meet all requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality outline. If the contract includes inspection requirements not specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency inspection does not allow products that are known to be defective to be submitted for acceptance, nor can the ordering party be required to accept defective products. 4.2 Inspection classification
The inspection classification specified in this specification is as follows:
a. Screening (see 4.3);
b. First piece inspection (see 4,4);
. Quality consistency inspection (see 4.5).
4.3 Screening
100% screening of enameled manganese copper wire wound resistors, low temperature thermistor sheets and low temperature thermistor parallel components that constitute the components shall be carried out in accordance with the requirements of 3.3 and 3.14, and unqualified products shall be eliminated. 4.4 First piece inspection
First piece inspection shall be carried out after signing the contract and before the start of production. The number of components inspected for the first piece shall not be less than 3. .
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4.4.1 First piece inspection
SJ 20725 1998
Unless otherwise specified, the first piece inspection sample shall be inspected according to the items and sequence specified in Table 4. No defective products are allowed. If the first article inspection fails, production cannot be organized unless corrective measures are taken and the inspection is repeated after correction. Table 4
Inspection items
Appearance quality
Dimensions
Rated zero-power resistance
Zero-power resistance in liquid ammonia
Voltage-current characteristics in liquid ammonia
Resistance-temperature characteristics
Insulation resistance
Steady-state heat
Low pressure
Temperature shock
Lead flap strength
High temperature life
Random vibration
4.5 Quality-Consistency Inspection
Requirement Clause
Method Clause
The samples submitted for quality consistency inspection, i.e. delivery inspection, must be products produced with exactly the same process specifications as the first article inspection. The quality consistency inspection consists of Group A and Group C. A inspection is a batch inspection, and C inspection is a periodic inspection. 4.5.1 Batch inspection
Batch inspection of components is carried out by A inspection group.
4.5.1.1 Inspection batch
The inspection batch should consist of components produced in the same order cycle. 4.5.1.2 A inspection
A inspection is carried out 100% according to the items and sequence specified in Table 5. Defective products are rejected. Table 5
Inspection items
Appearance quality
Dimensions
Rated zero-power resistance
Zero-power resistance in liquid nitrogen
Voltage-current characteristics in liquid nitrogen
Insulation resistance
4.5.2 Periodic inspection
Requirement clause
Method clause
SI 20725 1998
The periodic inspection consists of Group C inspection. In case of continuous batch production, a periodic inspection shall be carried out every 6 months. 4.5.2.1 Group C inspection
Group C inspection shall be carried out according to the items and sequence specified in Table 6. The number of samples for Group C inspection shall not be less than 3. Table 6
Steady-state damp heat
Low pressure
Temperature shock
Resistance-temperature characteristics
High temperature life
Random vibration
Terminal strength
4.5.2.2 Unqualified
Requirement clause
Method clause
Group C inspection If one sample fails, the periodic inspection will be invalid, and the acceptance and delivery of the product should be stopped at this time. The contractor should analyze the materials or processes, find out the cause of the failure and take corrective measures. After taking corrective measures, the additional samples should be re-inspected.
4.5.2.3 Handling of periodic inspection samples
Samples that have passed the periodic inspection shall not be delivered according to the contract or order. 4.5.3 Packaging inspection
The packaging of the low-temperature temperature compensation thermistor assembly shall comply with the requirements of Article 5.1. 4.6 Inspection method
4.6.1 Standard atmospheric conditions for the test
Temperature:
Relative humidity:
Air pressure;
4.6.2 Appearance quality
15 ~ 35℃
20%~80%
86 - 106kPa
Observe with a magnifying glass or microscope with a magnification of more than 10 times. The appearance quality requirements shall meet the requirements of Article 3.16. 4.6.3 Dimensions
Check the product's dimensions with a vernier caliper with an accuracy of 0.02mm. They shall meet the requirements of Article 3.3. 4.6.4 Rated zero-power resistance value
The rated zero-power resistance value shall be measured in accordance with GJB360A method 303 and the following provisions. 4.6.4.1 Temperature conditions
The test shall be carried out in a controllable uniform medium at 25±0.1℃. 4.6.4.2 Measuring instrument
Resistance measurement shall adopt a Wheatstone bridge with an accuracy of ±0.05% or a 5.5-digit digital multimeter. KAoNrKAca-
4.6.4.3 Measuring current
The measuring current shall not be greater than 1m4.
4.6.4.4 Contact resistance and connection error
SJ 20725 ~ 1998
The contact resistance between the measured sample and the measuring instrument and the error caused by their connecting wires shall not be greater than 0.10.4.6.4.5 Measuring procedure
Put the sample at the temperature specified in 4.6.4.1, use the measuring instrument specified in 4.6.4.2 and pass the measuring current specified in 4.6.4.3 to measure the DC resistance value. The requirements for the contact resistance and connection error resistance value shall meet the requirements of 4.6.4.4. The resistance value of the sample to be tested shall comply with the requirements of 3.5.2, 3.14.1.1, 3.14.2.1 and 3.14.3.1. Resistance value of the component:
Rg+ Rt
Where: R—resistance value of the enameled manganese copper wire winding, Q; Rt—resistance value of the low-temperature thermistor parallel component, e. 4.6.5 Measurement of resistance value in liquid nitrogen
The measurement of resistance value in liquid nitrogen shall be carried out in accordance with GJB360A method 303 and the following provisions. 4.6.5.1 Temperature conditions
... (1)
The sample to be tested is placed directly in liquid nitrogen, and the distance between the upper edge of the sample to be tested and the liquid nitrogen surface should be not less than 200mmla4.6.5.2 Measuring instrument
Resistance measurement shall adopt a Wheatstone bridge with an accuracy of +0.05% or a 5.5-digit digital multimeter. 4.6.5.3 Measuring current
The measuring current shall not be greater than 100rA.
4.6.5.4 Contact resistance and connection error
The contact resistance between the measured element and the measuring instrument and the error caused by their connecting wires shall not be greater than 0.50. 4.6.5.5 Measurement procedure
The measured sample shall be placed in the temperature conditions specified in Article 4.6.5.1 at a slow speed, and the measuring instrument specified in Article 4.6.5.2 shall be used. The test current specified in Article 4.6.5.3 shall be adopted. The error caused by the contact resistance and the connecting wires shall comply with the provisions of Article 4.6.5.4. The DC resistance value of the measured sample shall comply with the requirements of Article 3.5.3. 4.6.6 Voltage-current characteristic test
4.6.6.1 Temperature conditions
The measured sample shall be immersed in liquid nitrogen, and the upper edge of the measured sample shall be kept at least 200mm away from the liquid nitrogen surface. 4.6.6.2 Instruments
DC adjustable voltage regulated power supply provides voltage. Voltage and current can be measured by electrician instruments or digital instruments. The instruments used in the test should be able to ensure that the error of measuring voltage and current is no more than 0.5%. 4.6.6.3 Test system
The voltage and current characteristic test system is shown in Figure 3.
4.6.6.4 Test procedure
4.6.6.4.1 Initial measurement
SJ 20725 1998
Tens of thousands of installations
Self-flowing total voltage power supply
Put the component in liquid nitrogen, turn off the switch St, and measure the resistance value of the sample under test in liquid nitrogen. The test method shall be in accordance with the provisions of Article 4.6.5.
4.6.6.4.2 Test
When testing the VI characteristic, turn on switch S1, turn on the digital multimeter to DC voltage, and apply DC voltage of 24V, 27V, 30V, and 35V to the sample under test in turn. When adding voltage, observe whether the current increases gradually or rapidly. If the current is stable, record the voltage and current values ​​after stabilization for 5s. If the current increases, quickly turn off the voltage and stop the test. 4.6.6.4.3 Final measurement
After the voltage-current characteristic test, the sample under test is restored in liquid nitrogen for no less than 1min, then turn off switch S, and measure the resistance value of the sample under test in liquid nitrogen. The measurement method shall be in accordance with the provisions of Article 4.6.5. 4.6.6.5 Qualification criteria
The VI characteristics of the component in liquid nitrogen shall comply with the requirements of Article 3.5.4. The VI characteristics of the low-temperature thermistor parallel device in liquid nitrogen shall comply with 3.14.3.3 requirements. The resistance change value of the test sample before and after the V1 test in liquid nitrogen is not more than ±10. 4.6.7 Insulation resistance measurement
Insulation resistance measurement is carried out in accordance with GB360A method 302 and the following provisions. 4.6.7.1 Preparation
The surface of the low-temperature thermistor and the manganese copper wire-wound resistor should be kept clean and dry, and can be wiped clean with anhydrous alcohol cotton balls when necessary.
4.6.7.2 Test voltage
DC voltage 500V±10%.
4.6.7.3 Test instrument
The accuracy of the insulation resistance test instrument should ensure that the error of the measured insulation resistance is not more than 10%. 4.6.7.4 Measurement voltage application point
The low-temperature thermistor is buckled on a bright copper plate (or aluminum plate) without a hydrogenated layer, and the measurement voltage is applied between the bare end of the electrode lead wire of the low-temperature thermistor and the plate (or lead plate). Manganese copper wire wound resistance measurement voltage is applied between the bare part of the enameled manganese copper wire lead 9
KAorKAca-
and the skeleton.
4.6.7.5 Test
ST 20725 - 1998
Connect according to the provisions of 4.6.7, apply voltage continuously for 2mi (if the insulation resistance reading is consistent with the provisions of 3.13 and is stable or continues to rise, the test can be terminated in advance) and read immediately. The measured insulation resistance shall meet the requirements of 3.13.
4.6.8 Strength of Lead Terminals
The strength test of the lead terminals shall be carried out in accordance with GIB360A method 211 test condition A and the following provisions. 4.6.8.1 Fixing method
The bare end of the lead wire of the low temperature thermistor chip electrode is welded with a load fixing wire to fix the load device. 4.6.8.2 Applied force
Apply 45.0N force on the electrode lead wire axis. 4.6.8.3 Duration of applied force
Apply force gradually (without any impact) to the lead terminal, and then maintain for 5~10sc4.6.8.4 Failure judgment
Perform the lead terminal strength test in accordance with the provisions of each item of 4.6.8. If the electrode lead wire solder joints welded on the low-temperature thermistor do not fall off, it is judged to be qualified.
4.6.9 Steady-state damp heat
Perform in accordance with the provisions of GJB360A method 103 test condition B, without detection and load during the test. The change in the resistance value of the sample in nitrogen before and after the test should meet the requirements of 3.7. 4.6.10 Low pressure
Perform according to GB360A method 105 test condition E, the test time is 1h, and the change of the resistance value of the sample in liquid nitrogen before and after the test shall meet the requirements of Article 3.8. 4.6.11 Overflow shock
4.6.11,1 Test conditions
Temperature: 25±10℃, 77K (liquid nitrogen overflow). Number of cycles: 5 cycles.
4.6.11.2 Test procedure
First, measure the resistance value of the sample in liquid nitrogen according to the method of 4.6.5. 77K, 298±10K, and 77K constitute a temperature cycle. Place it at each temperature for 15min. After 5 temperature cycles, measure the resistance value of the sample in liquid nitrogen again. 4.6.11.3 Qualification criterion
Before and after 5 Yanjian cycles, the change of the resistance value of the sample in the condensate shall meet the requirements of Article 39. 4.6.12 Resistance temperature characteristics
4.6.12.1 Temperature conditions
Test according to the temperature series in Table 2 of Article 3.5.5. The temperature control accuracy of each temperature point should not be greater than ±0.1K. 4.6.12.2 Measuring current
The measuring current is selected according to the following provisions: 1mA at 298K, 0.Im4 at 77K, 0.01mA at 20K, 4.6.12.3 Measurement procedure
Measure the zero-power resistance value of the enameled manganese copper wire wound resistor R, and the low-temperature thermistor parallel component R, at each temperature point respectively. Then calculate the zero-power resistance value of the low-temperature temperature compensation thermistor component R, according to the following formula, and its value should meet the requirements of Table 2-
of Article 3.5.5.
4.6.13 High temperature life
SJ 20725 ~ 1998
Rb=R+R
According to the provisions of GJB360A Method 108, the test temperature is 150±3℃, the test time adopts test condition A, and the resistance value of the sample in liquid nitrogen before and after the test shall meet the requirements of Article 3.10. 4.6.14 Random vibration
Vibration test conditions are shown in Table 7.
Frequency range (Hz)
20 - 300
300 ~ 1000
Test time: 1=1.0min
Acceleration spectrum density (mn/s)3/Hz
The change of the resistance value of the sample in liquid nitrogen before and after the test shall meet the requirements of Article 3.12. 5 Delivery preparation
5.1 Packaging requirements
Total root mean square acceleration value m/z?
The marking on the module packaging bag shall comply with the requirements of Article 3.15, and the packaging bag shall contain anti-extrusion materials and inspection certificates. The outer packaging box shall be strong enough to ensure that it will not be damaged by possible extrusion during transportation. The packaging box shall have relevant graphic signs such as "Handle with care" and "Avoid moisture" as specified in B19. 5.2 Transportation
The packaging box containing the module can be transported by any means of transportation, but rain, snow, heavy pressure, mechanical impact and other situations that may damage the packaging box should be avoided during transportation. 5.3 Storage
The module should be stored in a dry, ventilated, pollution-free and corrosive gas environment with a temperature of =10℃～+40℃ and a relative humidity of no more than 80%.
5.4 Storage period
The storage period is -- years. Modules that exceed the storage period must be re-inspected. The inspection shall comply with the requirements of 3.3, 3.5.2, 3.5.3, 3.5.4, 3.13, 3.14.1.1, 3.14.3. 6. Notes
6.1 Intended use
The components are used as temperature compensation for the solenoid coil resistance of the solenoid valve under cryogenic conditions. 6.2 Contents of ordering documents
The contract or order shall contain the following:
iKAoNrKAca-1 Test conditions
Temperature: 25±10℃, 77K (liquid nitrogen overflow). Number of cycles: 5 cycles.
4.6.11.2 Test procedure
First, measure the resistance value of the sample in liquid nitrogen according to the method in 4.6.5. 77K, 298±10K, and 77K constitute a temperature cycle. Place it at each temperature for 15mmin. After 5 temperature cycles, measure the resistance value of the sample in liquid nitrogen again. 4.6.11.3 Qualification criteria
Before and after 5 temperature cycles, the change in the resistance value of the sample in the liquid nitrogen meets the requirements of Article 39. 4.6.12 Resistance temperature characteristics
4.6.12.1 Temperature conditions
Test according to the temperature series in Table 2 of Article 3.5.5. The temperature control accuracy of each temperature point should not be greater than ±0.1K. 4.6.12.2 Measuring current
The measuring current is selected as follows: 1mA at 298K, 0.Im4 at 77K, 0.01mA at 20K, 4.6.12.3 Measuring procedure
Measure the zero-power resistance value of the enameled manganese copper wire-wound resistor R, and the low-temperature thermistor parallel component R, at each temperature point. Then calculate the zero-power resistance value of the low-temperature temperature compensation thermistor component R, according to the following formula, and its value should meet the requirements of Table 2-
in Article 3.5.5.
4.6.13 High temperature life
SJ 20725 ~ 1998
Rb=R+R
According to the provisions of GJB360A Method 108, the test temperature is 150±3℃, the test time adopts test condition A, and the resistance value of the sample in liquid nitrogen before and after the test shall meet the requirements of Article 3.10. 4.6.14 Random vibration
Vibration test conditions are shown in Table 7.
Frequency range (Hz)
20 - 300
300 ~ 1000
Test time: 1=1.0min
Acceleration spectrum density (mn/s)3/Hz
The change of the resistance value of the sample in liquid nitrogen before and after the test shall meet the requirements of Article 3.12. 5 Delivery preparation
5.1 Packaging requirements
Total root mean square acceleration value m/z?
The marking on the module packaging bag shall comply with the requirements of Article 3.15, and the packaging bag shall contain anti-extrusion materials and inspection certificates. The outer packaging box shall be strong enough to ensure that it will not be damaged by possible extrusion during transportation. The packaging box shall have relevant graphic signs such as "Handle with care" and "Avoid moisture" as specified in B19. 5.2 Transportation
The packaging box containing the module can be transported by any means of transportation, but rain, snow, heavy pressure, mechanical impact and other situations that may damage the packaging box should be avoided during transportation. 5.3 Storage
The module should be stored in a dry, ventilated, pollution-free and corrosive gas environment with a temperature of =10℃～+40℃ and a relative humidity of no more than 80%.
5.4 Storage period
The storage period is -- years. Modules that exceed the storage period must be re-inspected. The inspection shall comply with the requirements of 3.3, 3.5.2, 3.5.3, 3.5.4, 3.13, 3.14.1.1, 3.14.3. 6. Notes
6.1 Intended use
The components are used as temperature compensation for the solenoid coil resistance of the solenoid valve under cryogenic conditions. 6.2 Contents of ordering documents
The contract or order shall contain the following:
iKAoNrKAca-1 Test conditions
Temperature: 25±10℃, 77K (liquid nitrogen overflow). Number of cycles: 5 cycles.
4.6.11.2 Test procedure
First, measure the resistance value of the sample in liquid nitrogen according to the method in 4.6.5. 77K, 298±10K, and 77K constitute a temperature cycle. Place it at each temperature for 15mmin. After 5 temperature cycles, measure the resistance value of the sample in liquid nitrogen again. 4.6.11.3 Qualification criteria
Before and after 5 temperature cycles, the change in the resistance value of the sample in the liquid nitrogen meets the requirements of Article 39. 4.6.12 Resistance temperature characteristics
4.6.12.1 Temperature conditions
Test according to the temperature series in Table 2 of Article 3.5.5. The temperature control accuracy of each temperature point should not be greater than ±0.1K. 4.6.12.2 Measuring current
The measuring current is selected as follows: 1mA at 298K, 0.Im4 at 77K, 0.01mA at 20K, 4.6.12.3 Measuring procedure
Measure the zero-power resistance value of the enameled manganese copper wire-wound resistor R, and the low-temperature thermistor parallel component R, at each temperature point. Then calculate the zero-power resistance value of the low-temperature temperature compensation thermistor component R, according to the following formula, and its value should meet the requirements of Table 2-
in Article 3.5.5.
4.6.13 High temperature life
SJ 20725 ~ 1998
Rb=R+R
According to the provisions of GJB360A Method 108, the test temperature is 150±3℃, the test time adopts test condition A, and the resistance value of the sample in liquid nitrogen before and after the test shall meet the requirements of Article 3.10. 4.6.14 Random vibration
Vibration test conditions are shown in Table 7.
Frequency range (Hz)
20 - 300
300 ~ 1000
Test time: 1=1.0min
Acceleration spectrum density (mn/s)3/Hz
The change of the resistance value of the sample in liquid nitrogen before and after the test shall meet the requirements of Article 3.12. 5 Delivery preparation
5.1 Packaging requirements
Total root mean square acceleration value m/z?
The marking on the module packaging bag shall comply with the requirements of Article 3.15, and the packaging bag shall contain anti-extrusion materials and inspection certificates. The outer packaging box shall be strong enough to ensure that it will not be damaged by possible extrusion during transportation. The packaging box shall have relevant graphic signs such as "Handle with care" and "Avoid moisture" as specified in B19. 5.2 Transportation
The packaging box containing the module can be transported by any means of transportation, but rain, snow, heavy pressure, mechanical impact and other situations that may damage the packaging box should be avoided during transportation. 5.3 Storage
The module should be stored in a dry, ventilated, pollution-free and corrosive gas environment with a temperature of =10℃～+40℃ and a relative humidity of no more than 80%.
5.4 Storage period
The storage period is -- years. Modules that exceed the storage period must be re-inspected. The inspection shall comply with the requirements of 3.3, 3.5.2, 3.5.3, 3.5.4, 3.13, 3.14.1.1, 3.14.3. 6. Notes
6.1 Intended use
The components are used as temperature compensation for the solenoid coil resistance of the solenoid valve under cryogenic conditions. 6.2 Contents of ordering documents
The contract or order shall contain the following:
iKAoNrKAca-
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