GB/T 3789.12-1991 Test methods for electrical properties of transmitting tubes Test methods for inter-electrode insulation

This standard specifies the test method for the inter-electrode insulation of transmitting tubes - inter-electrode leakage current or inter-electrode insulation resistance. This standard is applicable to the test of inter-electrode insulation of space charge controlled oscillation, modulation, adjustment and power amplifier tubes with anode dissipation power above 25W. GB/T 3789.12-1991 Test method for electrical properties of transmitting tubes Test method for inter-electrode insulation GB/T3789.12-1991 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test methods for electrical properties of transmitting tubes
Test methods for interelectrode insulation
Measurements of the electrical properties of trarismitting hubesMeasuring methods of interelectrode insulationSubject content and scope of application
This standard specifies the test methods for interelectrode insulation of transmitting tubes -
interelectrode leakage current or interelectrode insulation resistancewww.bzxz.net
GB/T 3789. 1291
Replaces GB3789.12-83
This standard is applicable to the test of interelectrode insulation of space charge controlled oscillation, modulation, regulation and power amplifier tubes with anode dissipation power of more than 25W.
2 Reference standards
General principles for testing the electrical properties of transmitting tubes
GB/T 3789. 1
3 Terms
3.1 Interelectrode leakage current (insulation current) Interelectrode leakage current refers to the conduction current that flows between two or more electrodes in any way (except the current flowing through the vacuum gap between electrodes) under the specified working conditions. 3.2 Interelectrode insulation resistance The ohm value that indicates the degree of insulation between electrodes. 4 Electrical schematics
5 Test equipment and test rules
The test equipment and test rules shall comply with the provisions of GB/T3789.1. 6 Test methods
6.1 Connect the electrodes to be tested to the A and B terminals, and the other electrodes are disconnected. Add voltage (the voltage value is specified in the product standard. If there is no specification, it should be 500V). At this time, the indication value of the Huian meter is the leakage current (or the scale is the insulation resistance value). If the polarity of the applied voltage is not specified, the test should be carried out under two polarities (that is, under the two positions of the conversion switch). And read the smaller resistance value (or the larger current value) as the test result.
6.2 When testing the insulation resistance between the cathode and the filament, it must be carried out when the cathode is heated and the other electrodes are disconnected. If the preheating time is not specified in the product standard, it should be 3min. When testing the insulation resistance between the cathode and other electrodes, if the filament is in the heated state, only the cathode is allowed to be at a positive potential.
Additional Notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard was drafted by the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry and Factory 779.
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