This standard specifies the test method for the third grid cut-off voltage of the transmitting tube. This standard is applicable to the test of the third grid cut-off voltage of the space charge controlled oscillation, modulation, adjustment and power amplifier tube with anode dissipation power above 25W. GB/T 3789.11-1991 Test method for electrical performance of transmitting tube Test method for third grid cut-off voltage GB/T3789.11-1991 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 third-pole cut-off voltage
Measurements of the electrlcal properties of transmitting tubesMeasurlng methods of grid N03 cut-off voltaeeSubject content and scope of application
This standard specifies the test methods for the third-pole cut-off voltage of transmitting tubes. GB/T3789.11-91
Replaces GB 3789. 11---83
This standard applies to the test of the third-pole cut-off voltage of space charge controlled oscillation, modulation, adjustment and power amplifier tubes with anode dissipation power of more than 25 W.
2 Reference Standards
GB/T3789.1 General Rules for Testing Electrical Performance of Transmitter Tubes
3 TermsbzxZ.net
Third Grid Cut-off Voltagegrid N8 cut-off yoltageThe third grid cut-off voltage refers to the negative voltage of the third grid when the anode current reaches the cut-off state under the specified working conditions. 4 Electrical Schematic Diagram
In the diagram:
Signal generator, the frequency should be specified in the product standard, and the waveform distortion coefficient is not greater than 1%. The second grid current limiting resistor. The resistance value should be specified in the product standard. Inductor. Its inductance should be specified, and the DC voltage drop on it should be less than 0.5% of the first grid voltage, a capacitor. When the frequency is selected, its capacitive reactance shall meet the following requirements: 1
National Technical Supervision Bureau 1991-08-15 Approved L
50～100
1992-04-01 Implementation
Where: ——selected angular frequency.
5 Test equipment and test rules
GB/T 3789.11-91
The test equipment and test rules shall comply with the provisions of GB/T 3789.1. 6 Test method
6.1 Add the filament voltage and the DC voltage of each pole according to the specification. 6.2 Add the specified signal voltage to the first grid. 6.3 Change the negative voltage of the third grid so that the anode current reaches a certain specified value of zero or close to zero (specified in the detailed specification), and read the voltage value of the third grid.
Additional remarks:
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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