Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
QJ 20422-2016 consists of the following parts under the general title Environment test methods for spacecraft unit:
——Part 1: Surface charging and discharging test;
——Part 2: Atomic oxygen test;
——Part 3: Solar ultraviolet irradiation test;
——Part 4: Magnetic test;
——Part 5: Vacuum cold welding test;
——Part 6: Acceleration test;
——Part 7: Vibration test;
——Part 8: Acoustic test;
——Part 9: Shock test.
This is Part 4 of QJ 20422-2016.
This part replaces QJ 2630.4-1996 Space environment test methods for satellite components - Magnetic test.
The following main changes have been made with respect to QJ 2630.4-1996:
a) the "satellite" in the standard name and text is modified to "spacecraft";
b) the magnetic compensation test method is added;
c) several terms are modified, added and quoted;
d) the clause "Test items and purposes" is added;
e) the clause "Environmental magnetic field conditions" is modified;
f) the requirements for data acquisition system are added;
g) the clause "Test documents" is modified;
h) the arrangement of magnetometer probes in the magnetic moment measurement method is changed;
i) the precision requirements of measuring instruments are modified;
j) the requirements for parameters such as magnetic induction intensity and time of magnetizing and demagnetizing are modified.
Annex A of this part is normative.
This part was proposed by China Aerospace Science and Technology Corporation.
This part is under the jurisdiction of China Astronautics Standards Institute.
This part was issued in March 1996 for the first time.
Environment test methods for spacecraft unit - Part 4: Magnetic test
1 Scope
This part specifies the test items and purposes, laboratory environment, test requirements, test procedures, test interruption and handling, test documents, etc. of the magnetic test of spacecraft unit-level products.
This part is applicable to the magnetic test of spacecraft unit-level products in zero magnetic field environment. It may be referred to by the magnetic test of spacecraft parts and components.
2 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
2.1
zero magnetic field
magnetic field with the magnetic induction intensity less than 5nT in the center of the homogeneous space of the main coil
2.2
stray magnetic field
magnetic field existing when the test piece is working in the zero magnetic field
2.3
remanent magnetic field
magnetic field existing when the test piece is not working in the zero magnetic field
2.4
stray magnetic moment
magnetic moment existing when the test piece is working in the zero magnetic field
2.5
remanent magnetic moment
magnetic moment existing when the test piece is not working in the zero magnetic field
2.6
magnetic field inhomogeneity
absolute value of the difference between the maximum value and the minimum value of the magnetic induction intensity at the same time in a specified space
2.7
homogeneous space of magnetic field
space where the magnetic field inhomogeneity is less than the required value
2.8
magnetic field instability
change value of the magnetic field in the homogeneous space within the specified time
2.9
main coil
device that can offset the geomagnetic field in the center of the coil by adjusting the current in the coil to present a zero magnetic field environment or a stationary magnetic field environment
2.10
magnetizing field
DC magnetic field used to magnetize the test piece
2.11
demagnetizing field
alternating magnetic field used to make the amplitude of demagnetization of the test piece continuously attenuate to zero
2.12
magnetizing and demagnetizing coils
device that can generate the required magnetizing or demagnetizing environment in the center of the coil by adjusting the current in the coil
2.13
magnetic compensation
changing the magnetic moment or magnetic field of the test piece by attaching a compensating magnet (permanent magnet) to it
3 Test items and purposes
3.1 Test items
The magnetic test items generally include:
a) magnetic moment measurement, including remanent magnetic moment measurement and stray magnetic moment measurement;
b) magnetic field measurement, including remanent magnetic field measurement and stray magnetic field measurement;
c) magnetizing test;
d) demagnetizing test;
e) magnetic compensation test.
3.2 Test purposes
The purpose of each magnetic test item is as follows:
a) magnetic moment measurement: to measure the remanent magnetic moment and stray magnetic moment of the test piece and evaluate whether they meet the design requirements;
b) magnetic field measurement: to measure the magnetic field distribution around the test piece or the remanent magnetic field and stray magnetic field at a certain point, and evaluate whether they meet the design requirements;
c) magnetizing test: to evaluate the change of remanent magnetic moment or remanent magnetic field after the test piece is magnetized by external magnetic field;
d) demagnetizing test: to eliminate the magnetic moment or magnetic field increased when the test piece is magnetized by the external magnetic field;
e) magnetic compensation test: to reduce the remanent magnetic moment and remanent magnetic field of the test piece by attaching a compensating magnet to it.
4 Laboratory environment
The laboratory environment is generally as follows:
a) temperature: 15℃~35℃;
b) relative humidity: 20%~80%;
c) atmospheric pressure: 78kPa~103kPa;
d) cleanliness: Class 100,000.
Foreword I
1 Scope
2 Terms and definitions
3 Test items and purposes
4 Laboratory environment
5 Test requirements
6 Test procedures
7 Test interruption and handling
8 Test documents
Annex A (Normative) Data processing method for magnetic moment measurement
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
QJ 20422-2016 consists of the following parts under the general title Environment test methods for spacecraft unit:
——Part 1: Surface charging and discharging test;
——Part 2: Atomic oxygen test;
——Part 3: Solar ultraviolet irradiation test;
——Part 4: Magnetic test;
——Part 5: Vacuum cold welding test;
——Part 6: Acceleration test;
——Part 7: Vibration test;
——Part 8: Acoustic test;
——Part 9: Shock test.
This is Part 4 of QJ 20422-2016.
This part replaces QJ 2630.4-1996 Space environment test methods for satellite components - Magnetic test.
The following main changes have been made with respect to QJ 2630.4-1996:
a) the "satellite" in the standard name and text is modified to "spacecraft";
b) the magnetic compensation test method is added;
c) several terms are modified, added and quoted;
d) the clause "Test items and purposes" is added;
e) the clause "Environmental magnetic field conditions" is modified;
f) the requirements for data acquisition system are added;
g) the clause "Test documents" is modified;
h) the arrangement of magnetometer probes in the magnetic moment measurement method is changed;
i) the precision requirements of measuring instruments are modified;
j) the requirements for parameters such as magnetic induction intensity and time of magnetizing and demagnetizing are modified.
Annex A of this part is normative.
This part was proposed by China Aerospace Science and Technology Corporation.
This part is under the jurisdiction of China Astronautics Standards Institute.
This part was issued in March 1996 for the first time.
Environment test methods for spacecraft unit - Part 4: Magnetic test
1 Scope
This part specifies the test items and purposes, laboratory environment, test requirements, test procedures, test interruption and handling, test documents, etc. of the magnetic test of spacecraft unit-level products.
This part is applicable to the magnetic test of spacecraft unit-level products in zero magnetic field environment. It may be referred to by the magnetic test of spacecraft parts and components.
2 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
2.1
zero magnetic field
magnetic field with the magnetic induction intensity less than 5nT in the center of the homogeneous space of the main coil
2.2
stray magnetic field
magnetic field existing when the test piece is working in the zero magnetic field
2.3
remanent magnetic field
magnetic field existing when the test piece is not working in the zero magnetic field
2.4
stray magnetic moment
magnetic moment existing when the test piece is working in the zero magnetic field
2.5
remanent magnetic moment
magnetic moment existing when the test piece is not working in the zero magnetic field
2.6
magnetic field inhomogeneity
absolute value of the difference between the maximum value and the minimum value of the magnetic induction intensity at the same time in a specified space
2.7
homogeneous space of magnetic field
space where the magnetic field inhomogeneity is less than the required value
2.8
magnetic field instability
change value of the magnetic field in the homogeneous space within the specified time
2.9
main coil
device that can offset the geomagnetic field in the center of the coil by adjusting the current in the coil to present a zero magnetic field environment or a stationary magnetic field environment
2.10
magnetizing field
DC magnetic field used to magnetize the test piece
2.11
demagnetizing field
alternating magnetic field used to make the amplitude of demagnetization of the test piece continuously attenuate to zero
2.12
magnetizing and demagnetizing coils
device that can generate the required magnetizing or demagnetizing environment in the center of the coil by adjusting the current in the coil
2.13
magnetic compensation
changing the magnetic moment or magnetic field of the test piece by attaching a compensating magnet (permanent magnet) to it
3 Test items and purposes
3.1 Test items
The magnetic test items generally include:
a) magnetic moment measurement, including remanent magnetic moment measurement and stray magnetic moment measurement;
b) magnetic field measurement, including remanent magnetic field measurement and stray magnetic field measurement;
c) magnetizing test;
d) demagnetizing test;
e) magnetic compensation test.
3.2 Test purposes
The purpose of each magnetic test item is as follows:
a) magnetic moment measurement: to measure the remanent magnetic moment and stray magnetic moment of the test piece and evaluate whether they meet the design requirements;
b) magnetic field measurement: to measure the magnetic field distribution around the test piece or the remanent magnetic field and stray magnetic field at a certain point, and evaluate whether they meet the design requirements;
c) magnetizing test: to evaluate the change of remanent magnetic moment or remanent magnetic field after the test piece is magnetized by external magnetic field;
d) demagnetizing test: to eliminate the magnetic moment or magnetic field increased when the test piece is magnetized by the external magnetic field;
e) magnetic compensation test: to reduce the remanent magnetic moment and remanent magnetic field of the test piece by attaching a compensating magnet to it.
4 Laboratory environment
The laboratory environment is generally as follows:
a) temperature: 15℃~35℃;
b) relative humidity: 20%~80%;
c) atmospheric pressure: 78kPa~103kPa;
d) cleanliness: Class 100,000.
Contents of QJ 20422.4-2016
Foreword I
1 Scope
2 Terms and definitions
3 Test items and purposes
4 Laboratory environment
5 Test requirements
6 Test procedures
7 Test interruption and handling
8 Test documents
Annex A (Normative) Data processing method for magnetic moment measurement
