Measuring methods of the heater or filament current and voltage for electronic tubes

SJ/T 11082-1996 Test method for current and voltage of hot wire or filament of electron tube SJ/T11082-1996 Standard download decompression password: www.bzxz.net

621.385.032.3.021/.027：621.317.3GB
National Standard of the People's Republic of China
GB11486--89
Reduced to SJ/T11082-96
Measuring methods of the
heater or filament current and
voltage for electronic tubes1989-03-31Promulgated
State Administration of Technical SupervisionPromulgated
TTKNKAa
Implemented on 1990-03-01
National Standard of the People's Republic of China
Measuring methods of the
heater or filament current and Voltage for electronic tubes tubesGB11486-89
This standard applies to the test of hot wire or filament current and voltage of electron tubes (such as space charge control electron tubes, electron beam tubes, microwave electron tubes, ion tubes and high voltage rectifier tubes, etc.).
The test equipment and test rules shall comply with the conditions specified in the test method standards for such electron tubes. 1 Definition
1.1 Hot wire or filament current refers to the current passing through the hot wire or filament under specified conditions. 1.2 Hot wire or filament voltage refers to the voltage across the hot wire or filament terminals. 2 Electrical schematic diagram (taking space charge control electron tube as an example) Figure 1
3 Test conditions
3.1 The electrical schematic diagram for testing hot wire or filament current and voltage shall comply with Figure 1 or Figure 2. Figure 2
3.2 The test of the hot wire or filament current should be carried out when the hot wire or filament voltage is the rated value (specified in the product standard) and no voltage is applied to other electrodes, and the hot wire or filament reaches thermal equilibrium. 3.3 For electron tubes with a hot wire or filament with a central lead wire, the test of the hot wire or filament current should be carried out when the two halves of the hot wire or filament are connected in parallel or in series.
3.4 ​​The test of the hot wire or filament voltage should be carried out when the hot wire or filament current is the rated value (specified in the product standard) and no voltage is applied to other electrodes.
Note: For low-power electron tubes with indirectly heated cathodes, it is allowed to test under the condition that the cathode current is the rated value. 4 Precautions
Approved by the Ministry of Machinery and Electronics of the People's Republic of China on March 21, 1989 YYKAONYKCa
Implemented on March 1, 1990
GB11486-89
4.1 The voltage used to test the hot wire or filament current can be DC or AC. It is better to test under DC conditions. Under AC conditions, the frequency should be selected so that the influence of the reactance of the hot wire or filament on the test results can be ignored. If the nonlinear distortion coefficient of its power supply affects the test accuracy, it should be corrected. 4.2 When testing the hot wire or filament current and voltage, the voltage division effect of the ammeter and the shunt effect of the voltmeter should be taken into account. When measuring current, the shunt current of the voltmeter used to check the hot wire or filament voltage should be taken into account, and when measuring voltage, the voltage drop on the ammeter should be considered. wwW.bzxz.Net
4.3 When testing the hot wire or filament current, if the preheating time is specified, the current should be stabilized within this time. 4.4 For electron tubes with filament current greater than 20A, the filament voltage should be gradually increased, and the filament current should not exceed 1.5 times the rated value during the voltage increase process.
Additional Notes:
This standard was drafted by the Standardization Institute of the Ministry of Electronics Industry. 2
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