This specification specifies the detailed requirements for FM24 type coil-sealed tubes. This specification applies to FM24 type coil-sealed tubes. FM24 type coil-sealed tubes are mainly used for L-band broadband pulse power amplifiers of digital transmission and navigation equipment. SJ 20018-1992 Detailed Specifications for FM24 Type Coil-Sealed Tubes SJ20018-1992 Standard Download Decompression Password: www.bzxz.net
This specification specifies the detailed requirements for FM24 type coil-sealed tubes. This specification applies to FM24 type coil-sealed tubes. FM24 type coil-sealed tubes are mainly used for L-band broadband pulse power amplifiers of digital transmission and navigation equipment.

GB/T 3789-1991 Test method for electrical properties of transmitting tubes
GB 7273-1987 Test method for electrical properties of coiled sealed tubes
GB 7274-1987 Test method for inter-electrode capacitance of electron tubes
GB 11486-1989 Test method for current and voltage of hot wire or filament of electron tubes
GJB 616-1988 Test method for electron tubes
GJB 922-1990 General specification for electron tubes
GJB 921-1990 General specification for electron tube packaging

1 Scope
Military standard electronic tubes for the electronics industry of the People's Republic of China
Detail specification for disk-seal tube of type FM241.1 Subject content
This specification specifies the detailed requirements for disk-seal tube of type FM24. 1.2 Scope of application
This specification applies to disk-seal tube of type FM24
SJ20018-92
FM24 disk-seal tube is mainly used for L-band broadband pulse power amplifier of data transmission and navigation equipment. 1.3 Structural characteristics
Structure: metal ceramic triode.
Installation position: vertically upward or downward.
Cooling method: conduction forced air cooling.
Mass: maximum 7g.
1.4 Dimensions
For dimensions, see Figure A1 in Appendix A (Supplement). 1.5 Absolute Ratings
Hot Wire Voltage
Voltage between Hot Wire and Cathode
Anode Pulse Voltage
Grid Voltage
Anode Pulse Current
Grid Pulse Current
Anode Dissipated Power
Published by China Electronics Industry Corporation on February 1, 1992 Minimum Value
Maximum Value
Implemented on May 1, 1992
Pulse Width
Duty Ratio| |tt||Shell temperature
1.6 Test conditions (TC)
Hot wire voltage
Cathode preheating time
Anode voltage
Anode current
Grid voltage
Typical characteristics
Hot wire current
Amplification factorwww.bzxz.net
Transconductance (la=21mA)
Inter-electrode capacitance:
Anode and grid
Anode and cathode
Cathode and grid
Reference documents
GB/T3789-91
GB 7273—87
GB7274—87
GB11486-89
GJB616—88
GJB922—90
GJB92190
SJ20018--92
Continued Table 1
Minimum value
Minimum value
Maximum value
Nominal value
Maximum value
Anode with radiator and air cooling, radiator root temperature below 60C (radiator see Appendix D) Table 3
Minimum value||t t||Test method for electrical performance of transmitting tube
Test method for electrical performance of coil-sealed tube
Test method for inter-electrode capacitance of electron tube
Nominal value
Test method for current and voltage of hot wire or filament of electron tubeTest method for electron tube
General specification for electron tube
General specification for packaging of electron tube
Maximum value
3 Requirements
3.1 Detailed requirements
SJ20018--92
All requirements for FM24 coil-sealed tube shall comply with the provisions of this specification and GJB922 "General Specification for Electron Tubes". 3.2 Marking
Model: FM24;
Military mark: J;
Manufacture date and serial number;
Manufacturer's trademark.
4 Quality Assurance Provisions
Identification Inspection
Inspection or Test
Constant Damp Heat
Low-Temperature Pulse Emission
4.2 Quality Conformity Inspection
Test Ca
GJB616.1013
GJB616.1018
GB/T3789.3
4.2.1 Quality Conformity Inspection Part 1
Test Conditions
Non-Working State
t=40±2℃
Relative Humidity 90%~95%
Test After the test, let it stand at room temperature
Non-working state
a=100m/s2
Factory-50~80 times/min
Radial and axial directions
Upward 5000 times each
tkyr=5min
Up=Up=75V
r=lμs
fep=50Hz
t=-55℃
t=30min
Test requirements
Minimum value
Maximum value
See C1 and C2 in Appendix C
See Appendix C C1, C2
See C1 in Appendix C
Inspection or test
Visual inspection
Dimensional inspection
Hot wire current
Grid voltage
Grid reverse current
Insulation resistance between anode and cathode
Pulse radiation
Leakage between hot wire and cathode
GB11486
GB/T3789.21
GB/T3789.6
GB/T3789.2
SJ20018-92
Test Test conditions
Non-working state
Non-working state
Inspect with gauge, see Figure A2
GB/T3789.12
Non-working state
Measure with 500V megohmmeter
GB/T3789.3
GB/T3789.12
Quality consistency inspection
Inspection or test
Interchangeable size
Magnification factor
Inter-electrode capacitance:
Anode and grid
Anode and cathode
Cathode and grid
Part 2
Uap-Ugp=75V
r=lμs
fep-50Hz
Test conditions
Inspection requirements
Minimum value maximum value unit
See Appendix B
The measured pipe can rotate freely in the gauge
Inspection requirements
Minimum value maximum value unit
Non-working state
GB/T3789.6
GB7274
Non-working state
See Figure A1
4.2.3 Quality I Conformity inspection
Part 3
Inspection or test
Dimensions to be controlled
Vibration stability
Noise voltage
Hot wire cycle life test
Life test
Test after life test:
Pulse output power
Note: AQL
Qualified quality level
IL——Inspection level
D Destructive items
5 Delivery preparation
5.1 Packaging
SJ20018—92
Test conditions
Non-industrial Working state
GJB616.1008
Anode loop resistance
Ra=1kn
a=60m/s2
F=50 times/min
t=3min
When the voltage is connected and disconnected
t=1~2.5min
Cycle 1000 times
Pulse oscillation state
Inspection requirements
Minimum value Maximum value Unit
See Figure A1, C1 in Appendix C
See C1 in Appendix C
No short circuit in hot wire cathode
Hot No broken wire
See C1 and C3 in Appendix C
See C1 in Appendix C
f=1100~1300MHz
Uap=1000V
R, adjust
Ip≤2A
r=4μs
fcp-250Hz
5.1.1 Packaging requirements
SJ20018—92
a. Packaging should comply with the provisions of GJB921 "General Specification for Electronic Tube Packaging"; b. Packaging drawing number ××××××;
c Product certificate, factory inspection form.
5.1.2 Packaging mark
The packaging box mark should comply with GB191 "Packaging Storage and Transportation Pictorial Marking". 5.1.3 Packaging test
The packaging quality is assessed by drop test.
Drop test: The packaged coil-sealed tube is dropped freely from a height of 90cm on the cement floor for 4 times (once on the bottom, cover, and adjacent sides).
The coil-sealed tube after the test should not have mechanical damage, and the electrical parameters of the first part of the quality consistency test should comply with the provisions of the detailed specifications.
The packaging test of the coil-sealed tube is carried out during product identification or structural changes, as well as changes in packaging structure and materials. The sampling plan is n=4, c=1.
5.2 Storage
Electronic tubes should be stored in a dry, ventilated warehouse without the influence of corrosive gases at an ambient temperature of -5℃ to +40℃ and a relative humidity of no more than 80%.
5.3 Transportation
The packaged coil-sealed tube is allowed to be transported by any tool. During transportation, it should be avoided from intense vibration, impact, mechanical impact, direct rain and corrosion.
6 Notes
6.1 Contents of ordering documents
FM24 coil-sealed pipe;
Detailed specification number;
Manufacturer code or name;
d. Quantity.
6.2 Precautions for use
When the coil-sealed pipe is stored for a long time or the storage warehouse is relatively humid, the preheating time should be appropriately extended when using it. The preheating time should be a.
not less than 30 minutes.
b. It must be equipped with a good heat dissipation or blowing device when using it. The temperature gradient between ceramic insulators is limited to below 100℃. c
View in direction A
SJ20018-92
Appendix A
Appearance drawings of FM24 type coil seal tube
(Supplement)
Appearance drawings of FM24 type coil seal tube
Quality consistency inspection Part 1,
Use the gauge in Figure A2 to check the coaxiality.
Quality consistency inspection Part 2
Consistency inspection Part 3
Reference size
SJ20018—92
1.54±0.02
3.5±0.02
1.8±0.02
3.24+0.04
14.34+0.04
19.64+0.04
8.96+0.04
15.84+0.04
Unit: mm
Figure A2FM24 Coil Sealed Tube Appearance Gauge
Appendix B
Visual inspection
(Supplement)
The coil sealed tube label should comply with the regulations and be clear and firm. The weld of the coiled tube should be smooth and flat.
The surface of the coiled tube should be clean.
The pins of the coiled tube should be straight
Appendix C
Supplement to the sampling plan and inspection requirements
(Supplement)
C1 Sampling plan for environmental test and life test Batch
26-100
Number of sampling
(times)
Sample size
Number of qualified judgments
C2 Inspection after environmental test: Hot wire current, transconductance, leakage current between hot wire and cathode parameters shall meet the requirements of part 1 of quality consistency inspection.
C3 Except for non-working and defective hot wire and cathode defective products, other unqualified electrical performance tubes can be used for this test. 8
SJ20018-92
Appendix D
Anode radiator
(Supplement)
This appendix specifies the shape and size of the anode radiator for the FM24 type coil sealed tube test. 98
Figure D1FM24 coil sealed tube anode radiator
Additional notes:
This standard is proposed by the Science and Technology Quality Bureau of China Electronics Industry Corporation. This standard is under the jurisdiction of China Electronics Technology Standardization Institute. This standard was drafted by China Electronics Standardization Institute and the State-owned 774 Factory. The main drafters of this standard are: Hong Zheng, Duan Ruiyan, Zhang Quanshun, Liang Qin, Lai Wanqiong. Project code: B91038.
Material: Brass
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