This standard specifies the test method for the static characteristic curve of the common cathode circuit of the transmitting tube. This standard is applicable to the test of the static characteristic curve of the common cathode circuit of the space charge controlled oscillation, modulation, adjustment and power amplifier tube with anode dissipation power above 25W. GB/T 3789.14-1991 Test method for the electrical performance of transmitting tubes Test method for the static characteristic curve of the common cathode circuit GB/T3789.14-1991 Standard download decompression password: www.bzxz.net

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Test method for electrical properties of transmitting tubes
Test method for static characteristic curve of common cathode circuitMeasurements of the electrlcal properties of transmitting tubesMeasuring rethads or static characteristic curve far common cathode circuit1Subject content and scope of application
This standard specifies the test method for static characteristic curve of common cathode circuit of transmitting tubes. GB/T 3789. 14—91
Replaces GB3789.14—83
This standard is applicable to the test of static characteristic curve of common cathode circuit 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 methods of the electrical properties of transmitting tubes GB/T3789.3 Test methods for the electrical properties of transmitting tubes Test methods for cathode emission current 3 Terms
Static characteristic curve staticcharacteristic curve The static characteristic curve refers to a characteristic curve (the relationship between two parameters) in which the relevant parameters only have DC values ​​under the specified working conditions.
3.1 Anode characteristic curve
When the voltages of the other electrodes are kept constant and the first grid voltage takes a certain value, the relationship curve between the anode current and the anode voltage (the relationship curves between the anode current and the anode voltage when the grid voltage takes different values ​​constitute the characteristic curve family). 3.2 Anode-first grid characteristic curve
When the voltages of the other electrodes are kept constant and the anode voltage takes a certain value, the relationship curve between the anode current and the first grid voltage (the relationship curves between the anode current and the first grid voltage when the anode voltage takes different values ​​constitute the characteristic curve family). 3.3 The first: gate characteristic curve
When the voltages of the other electrodes remain constant and the anode voltage takes a certain value, the relationship curve between the first gate current and the first gate voltage (the relationship curve between the first gate current and the first gate voltage when the anode voltage takes different values ​​constitutes a family of characteristic curves). 3.4 The first gate-anode characteristic curve
When the voltages of the other electrodes remain constant and the first gate voltage takes a certain value, the relationship curve between the first gate current and the anode voltage (the relationship curve between the first gate current and the anode voltage when the first gate voltage takes different values ​​constitutes a family of characteristic curves). 3.5 The second gate-anode characteristic curve
When the voltages of the other electrodes remain constant and the second gate voltage takes a certain value, the relationship curve between the second gate current and the anode voltage (the relationship curve between the second gate current and the anode voltage when the second gate voltage takes different values ​​constitutes a family of characteristic curves). 3.6 Anode-third grid characteristic curve
The relationship curve between the anode current and the third grid voltage when the voltage of the other electrodes is kept constant and the anode voltage takes a certain value (the relationship curve between the anode current and the third grid voltage when the anode voltage takes different values ​​forms a family of characteristic curves). 3.7 Second grid-first grid characteristic curve The relationship curve between the second grid current and the first grid voltage when the voltage of the other electrodes is kept constant and the second grid voltage takes a certain value (the relationship curve between the second grid current and the first grid voltage when the second grid voltage takes different values ​​forms a family of characteristic curves). 3.8 Anode constant current characteristic curve
When the voltages of the other electrodes are kept constant and the anode current takes a certain value, the relationship curve between the first gate voltage and the anode voltage (the relationship curve between the first gate voltage and the anode voltage when the anode current takes different values ​​constitutes a family of characteristic curves) 3.9 Second gate constant current characteristic curve
When the voltages of the other electrodes are kept constant and the second gate current takes a certain value, the relationship curve between the first gate voltage and the anode voltage (the relationship curve between the first gate voltage and the anode voltage when the second gate current takes different values ​​constitutes a family of characteristic curves). 3.10 First gate constant current characteristic curve
When the voltages of the other electrodes are kept constant and the first gate current takes a certain value, the relationship curve between the first gate voltage and the anode voltage (the relationship curve between the first gate voltage and the anode voltage when the first gate current takes different values ​​constitutes a family of characteristic curves). 3. 11 Emission characteristic curve
When the voltages of the other electrodes are kept constant, the relationship curve between the cathode emission current and the filament voltage (or filament current). 3.12 Cut-off characteristic curve
The other electrode voltages are kept constant, and the first gate voltage and the anode voltage are taken at a certain value under the specified anode cut-off current. The characteristic curve family is composed of the relationship curve between the first gate voltage and the anode voltage. 4 Electrical schematic diagram
Figure 1 DC test electrical schematic diagram
Figure 2 Pulse method test electrical schematic diagram
In Figure 2:
Pulse signal generator:
-switch!
GB/T 3789. 14-91
, R2, R-non-inductive resistor. Its error is not greater than, 1%, and the resistance value should meet; R, 0.03RinlnRa0.03Ramn!
The voltage drop on Rs should be less than 5% of the gate pulse voltage value. When measuring the first gate pulse current, R3 is connected, and the other states should be short-circuited by switch S.
In the formula: Rmn-
-the minimum internal resistance of the electron tube when it is turned on; Reknin
-the equivalent minimum resistance between the second grid and the cathode of the electron tube when it is turned on. When R, R, and resistance values ​​are small, the influence of the wire and contact resistance should be considered. Due to the influence of heat dissipation, the change in resistance should not exceed ±0.5% of the normal value. C.O-capacitor. The capacity should meet: c.*
Ra, R2 resistor. The resistance should meet:
In the formula: P-
pulse drop coefficient;
-pulse width;
T-pulse period;
Z-resistor (R,) or inductor (Ln). The DC voltage drop on it should not exceed 0.5% of the DC voltage of the first grid, Ca
capacitor. The selection conditions: When the gate pulse current flows, the voltage drop on the capacitor should not exceed 1% of the pulse amplitude 1 Pulse voltmeter or oscilloscope.
5 Test equipment and test rules
Test equipment and test rules should comply with the provisions of GB/T 3789. 1. 6 Test method
6. 1 Test method of Figure 1
6.1.1 Add the filament voltage according to the specification.
6.1.2 Add the voltages of other poles according to the definition and measure the corresponding values, and give the corresponding characteristic curve. 6.2 Test method of Figure 2
6-2.1 Connect the filament voltage and the negative first gate voltage on the specification to make the tube under test in the cut-off state. 6.2.2 Superimpose a positive pulse voltage on the negative voltage of the first gate, measure the corresponding values ​​according to the definition, and draw the corresponding characteristic curve. 6. 2. 3 In all tests, the pulse current waveform should be monitored frequently to make it comply with the provisions of GB/T 3789. 1. 6.3 The test of emission characteristic curve shall be carried out in accordance with GB/T 3789.3. Note: When plotting the characteristic curve of tetrode and pentode, both cases should be plotted when the second grid voltage is equal to the specified value and 50% to 0% of the specified value. Additional remarks:
GB/T 3789. 14—91
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China, and was drafted by the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry and Factory 779.
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