This standard specifies the test method for the reference point of static characteristics of transmitting tubes. This standard is applicable to the test of the reference point of static characteristics of space charge controlled oscillation, modulation, adjustment and power amplifier tubes with anode dissipation power above 25W. GB/T 3789.21-1991 Test method for electrical performance of transmitting tubes Test method for reference point of static characteristics GB/T3789.21-1991 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test methods of the electrical properties of transmitting tubes
Test methods of static characteristic reference point
Measurenaenta of the electrical properties of tranamitting tubesMeasuaring methods of statlc characteristic reference point1 Subject content and scope of application
This standard specifies the test methods of static characteristic reference point of transmitting tubes. GB/T 3789. 21— 91
Replaces GB3789.21—83
This standard is applicable to the test of static characteristic reference point of space charge controlled oscillation, modulation, adjustment and power amplifier tubes with anode dissipation power above 25W.
2 Reference standards
GB/T3789.1 General principles for the test method of the electrical performance of transmitting tubes GB/T3789.14 Test method for the electrical performance of transmitting tubes Test method for static characteristic curve 3 Terminology
Static characteristic reference point static characteristic tefetence point The static characteristic reference point refers to a point on the electron tube anode current-first gate voltage characteristic curve. This point refers to the first grid voltage value when the anode current reaches the specified value under the electrode voltage state specified in the detailed specification. 4 Power supply schematic
Test equipment and test rules
The test equipment and test rules should comply with the provisions of GB/T3789.1. 6 Test method
6.1 Add the filament voltage and each electrode voltage according to the specification, and add enough negative voltage to the first grid to make the tube under test in the cut-off state. Approved by the State Administration of Technical Supervision on 1991-08-15, implemented on April 1, 1992
GB/T3789.21---91
6.2 Adjust the first grid voltage to make the anode current reach the specified value, and read the first grid voltage value. 6.3 If the anode maximum dissipation power is exceeded or the anode dissipation power is greater than 10kW during the test, the pulse method test in GB/T 3789.14 is allowed.
Additional explanation, bzxz.net
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 and Promotion Institute of the Ministry of Machinery and Electronics Industry and Factory 779
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