GB/T 3789.20-1991 Test method for electrical performance of transmitting tubes Test method for first grid current cut-off voltage

This standard specifies the test method for the cut-off voltage of the first grid current of the transmitting tube. This standard is applicable to the test of the cut-off voltage of the first grid current of the space charge controlled oscillation modulation adjustment and power amplifier tube with anode dissipation power above 25W. GB/T 3789.20-1991 Test method for electrical performance of transmitting tube Test method for cut-off voltage of the first grid current GB/T3789.20-1991 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test methods of electrical properties of transmitting tubes
Test methods of grid N1 current cut-off voltage Subject content and scope of application
This standard specifies the test methods of grid N1 current cut-off voltage of transmitting tubes. GB/T 3789. 20—91
Replaces GB 3789. 20—83
This standard is applicable to the test of grid N1 current cut-off voltage of space charge controlled oscillator, modulator, regulator and power amplifier tubes with anode dissipation power of more than 25W. bzxz.net
2 Reference Standards
GB/T 3789.1 General Rules for Testing Methods of Electrical Performance of Transmitter Tubes 3 Terms
1st Grid Current Cut-off Voltage grid ND1current cut-off voltage The 1st-pole current cut-off voltage refers to the 1st grid negative voltage when the 1st-pole forward current reaches the cut-off state under the specified working conditions.
Power Schematic
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 Add the filament voltage and the voltage of each pole according to the specifications to make the 1st grid have enough negative voltage. 6.2 Adjust the 1st grid voltage so that the 1st grid current reaches a certain specified value of zero or close to zero (specified in the detailed specifications), and read the 1st grid voltage value Approved by the State Administration of Technical Supervision on August 15, 1991 and implemented on April 1, 1992.
Additional Notes:
GB/T 3789.20
This standard was 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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