This standard specifies the test method for the maximum anode dissipation power and anode overload dissipation power of transmitting tubes. This standard is applicable to the test of the maximum anode dissipation power and anode overload dissipation power of space charge controlled oscillation, modulation, adjustment and power amplifier tubes with anode dissipation power above 25W. GB/T 3789.8-1991 Test method for electrical performance of transmitting tubes Test method for maximum anode dissipation power and anode overload dissipation power GB/T3789.8-1991 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 maximum anode dissipation power and anode overload dissipation power
Measurements of the electrical properties of transmilting tubes Measuring methods of maximum anode dissipation power and anode overload dissipation power Subject content and scope of application
GB/T 3789. 891
Replaces GB 3789. 8-83
This standard specifies the test methods of maximum anode dissipation power and anode overload dissipation power of transmitting tubes. This standard is applicable to the test of maximum anode dissipation power and anode overload dissipation power of space charge controlled oscillation, modulation, adjustment and power amplifier tubes with anode dissipation power of more than 25W. 2 Reference standards
CB/T3789.1 General principles for the test methods of the electrical properties of transmitting tubes GB/T 3789.4 Test methods for the electrical properties of transmitting tubes 3 Terminology
Test methods for the reverse current of the grid
3.1 Maximum anode dissipation powerbZxz.net
maximum anode dissipation power The maximum anode dissipation power refers to the maximum power that the anode is allowed to dissipate in the form of heat under the prescribed working conditions when it is bombarded by electrons. 3.2 Anode overload dissipation power anode overload dissipation power refers to the ability of the anode to withstand overload in a short period of time under the prescribed working conditions. 4 Electrical diagram
Test equipment and test rules
The test equipment and test rules should comply with the provisions of GB/T3789.1. Approved by the State Administration of Technical Supervision on August 15, 1991, and implemented on April 1, 1992
6 Test methods
GB/T3789.8-91
Forced cooling electron tubes should be tested at the lower limit of the cooling conditions specified in the product standard. 6.1 Test method for maximum anode dissipation power Add the filament voltage and other pole voltages according to the specification, adjust the first grid voltage, so that the product of the anode voltage and the anode current is equal to the maximum anode dissipation power, and keep the constant value within the specified time. Then quickly test the first grid reverse current of the tested tube according to GB/T3789.4.
6.2 Test method for anode overload dissipation power 6.2.1 Add the filament voltage and other pole voltages according to the specification, adjust the first reverse pole voltage, increase the anode current to make the anode dissipation power reach 1.2 times the maximum anode dissipation power, and keep it for 1 min. 6.2.2 In a short time (about 2 to 3 seconds), adjust the first grid voltage to increase the anode current to make the anode dissipation power reach 1.5 times the maximum anode dissipation power, maintain for 10 seconds, and then quickly test the first anode reverse current of the tested tube according to GB/T 3789.4. Note: ① The test of the anode over-cutting dissipation power of the tested tube should be carried out before the test of the maximum anode dissipation power. ② If the tested tube needs to test the anode over-cutting dissipation power in addition to the anode over-cutting dissipation power, the test of the first reverse current should be carried out after the test of the maximum anode dissipation power. If the screen reverse current is qualified, the maximum anode dissipation power and the anode over-cutting dissipation power of the tested tube are both qualified.
Additional remarks:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is drafted by the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry and Factory 779.
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