Description

Technical specifications The device measures the following parameters of the radio tubes: For diodes: - emission current or so of the anode; For triodes, double triodes, tetrodes, pentodes and combined lamps: - anode current; - current of the second grid; - reverse current of the first grid; - the steepness of the characteristics of the anode current: - the steepness of the characteristics of the heterodyne part of the frequency converter lamps; - anode current at the beginning of the characteristic or the locking voltage of the grid; In gas-discharge voltage zener diodes: - ignition potential; - stabilization voltage; - change in the stabilization voltage when the current strength changes; Cenotrons have: - rectified current when powered from the mains at a frequency of 50 Hz. And also for all types of lamps: - leakage current between the cathode and the heater at voltages of 100 and 250 V (plus on the cathode, minus on the heater); - leakage current between the electrodes (cathode and grid one, grid one and grid two) at a voltage of 100 and 250 V. The device provides the following voltages to the electrodes of the tested lamps: incandescent - from 1 to 14 V at a current of 1.2 A; on the first grid - 0, from -0.5 to 65 V and a fixed voltage of -100 V; on grid 2 - from 10 to 300 V at a current of up to 15 mA; at the anode - from 5 to 300 V at a current of up to 100 mA; variable voltages for the tested cenotrons are 2x350, 2x400, 2x500 V. The scales of the electrical measuring device have the following nominal values: for measuring the incandescent voltage - 3; 7.5; 15 V, to measure the voltage on the grid 1 - 1,5; 3; 7,5; 15; 30; 75 In; to measure the voltage on the grid 2 - 75; 150; 300 V; to measure the voltage at the anode - 15; 75; 150; 300 V. for measuring anode current and diode emission - 1,5; 3; 7,5; 15; 30; 75; 150 mA; to measure the grid current 2 - 0,75; 1,5; 3; 7,5; 15 mA; to measure the reverse grid current 1 and the anode current at the beginning of the characteristic - 0,75; 3; 15; 30; 150 mcA; for measuring rectified current - 150; 300 mA; to measure the steepness of the characteristic - 0,75; 1,5; 3; 7,5; 15; 30; 75 mA/V. The following cathode resistances are available in the device to supply automatic bias to the tested lamps: 30, 50, 68, 75, 80, 100, 120, 150, 160, 200, 220, 400, 500, 2x600 ohms. The main errors of measuring instruments under normal operating conditions do not exceed the following values: - the main error of voltmeters for measuring the glow voltages, anode, grid 1, grid 2 and milliammeters - the current of the anode, grid 2, as well as the rectified current of the tested cenotrons - ± 1.5% of the upper limit of measurement of each of the scales; - the main error of the tube microammeter for measuring the reverse current of grid 1 and the current at the beginning of the characteristic is ± 2.5% of the upper limit of measurement of each of the scales; - the main error of the lamp voltmeter for measuring the steepness of the characteristic is ± 2.5% of the upper limit of measurement of each of the scales. Normal operating conditions of the device: - ambient temperature +20 ± 5 °C; - relative humidity 65 ± 15 %; - atmospheric pressure 750 ± 30 mm Hg.; - mains supply voltage 50 Hz 220 V ± 2%. Operating conditions of the device: - temperature range from -10° to +40 °C; - relative humidity up to 80% at a temperature of +20 ° C; - frequency 50 Hz ± 1%; voltage 220 V ± 10 %; - frequency 400 Hz +7/-3; voltage 115 V ± 5 %; The meter is designed for continuous 8-hour operation, including self-heating time, when checking various types of lamps with an anode current of up to 100 mA. 2-hour operation of the meter is allowed when continuously checking lamps of the same type with an anode current from 100 to 150 mA. The self-heating time is 30 minutes. The device is powered from an alternating current network with a frequency of 50 Hz ± 1% with nominal voltage values of 127 and 220 V, as well as from an alternating current network with a frequency of 400 Hz with a nominal voltage of 115 V. The device works normally when the supply voltage from 220 V, 127 V, 50 Hz is changed by ± 10% and 115 V 400 Hz by ± 5% when the switch "Network" sets the arrow of the indicator device to the red line of the scale when the "Network" button is pressed. The arrow of the device is set to the red line with an accuracy of ± 1 small division. The maximum power consumed by the meter, at the rated voltage of the supply network, does not exceed 300 Watts when checking all types of lamps, except for the 5C3C lamp, when checking the 5C3C lamp - 450 watts. The average uptime of the meter is at least 1250 hours. Overall dimensions of the device are 515x320x230 mm. The weight of the device does not exceed 22 kg. List of electronic lamps tested on the L3-3 meter 1. In the mode of technical specifications for the lamp 1.1. Diodes: 2D3B, 2X1L, 6X2P, 12X3S. 1.2. Triodes: 2S3A, 2S14B, 3S6B-V, 3S7B-V, 6X1J, 6X1P, 6S2B, 6S2B-V, 6S2P, 6S2S, 6S3P, 6S3P-DR, 6S3P-EV, 6X4P, 6X4P-DR, 6X5D, 6S6B, 6S6B-V, 6S7B, 6S7B-V, 6S8S, 6S9D, 6S15P, 6S15P-E, 6S26B-K, 6S27B-K, 6S31B, 6S34A, 6S34A-V, 6S45P-E, 12S3S. 1.3. Double triodes: 1N3S, 6N1P, 6N1P-VI, 6N1P-EV, 6N2P, 6N2P-EV, 6N2P-ER, 6N3P, 6N3P-DR, 6N3P-E, 6N3P-EV, 6N5P, 6N6P, 6N6P-I, 6N6P-IR, 6N7S, 6N8S, 6N9S, 6N12S, 6N15P, 6N26P, 6N27P. 1.4. Output pentodes and beam tetrodes: 1P2B, 1P4B, 1P22B, 1P22B-V, 1P24B, 1P24B-V, 2P1P, 2P5B, 2P29L, 4P1L, 6P1P, 6P1P-V, 6P1P-EV, 6P3S, 6P3S-E, 6P6S, 6P7S, 6P9, 6P14P, 6P14P-V, 6P14P-EV, 6P14P-ER, 6P15P, 6P15P-V, 6P15P-EV, 6P15P-ER, 6P23P, 6P25B, 6P25B-V, 6P35G-V, 6P2P, 6E5P, 6E5P-I, 6E6P-E, 6E12N-V, 6E13N, 6E14N, 10P12S, 13P1S, 1515. 1.5. Short-characteristic pentodes: 1J17B, 1J18B, 1J24B, 1J37B, 2J27L, 4J1L, 6J1B, 6J1B-V, 6J1J, 6J1P, 6J1P-EV, 6J1P-ER, 6J2B, 6J2B-V, 6J2P, 6J2P-V, 6J2P-EV, 6J3, 6J3P, 6J3P-E, 6J4, 6J4P, 6J5B , 6J5B-V, 6J5P, 6J7, 6J8, 6J9G-V, 6J9P, 6J9P-E, 6J10B, 6J10B-V, 6J10P, 6J11P, 6J11P, 6J11P-E, 6J13L, 6J23P, 6J23P-E, 6J32B, 6J32P, 6J33A, 6J33A-V, 6J35B, 6J35B-V, 6J45B-V, 6J46B-V, 10J1L, 10J3L, 12J1L, 12J3L, 12J8. 1.6. Pentodes with an elongated characteristic: 1K2P, 6K1B, 6K1B-V, 6K1J, 6K1P, 6K3, 6K4, 6K4P, 6K6A, 6K6A-V, 6K7, 6K11B-K, 12K4. 1.7. Generator lamps: G-1625, GU-15, GU-32, GU-50. 1.8. Indicator lights: 6E1P, 6E5C. 1.9. Cenotrons: 1C1S, 1C7S, 1C11P, 1C21P, 3C16S, 3C18P, 6C13P. 1.10. Combined lamps: 1B2P, 6B8 (pentode), 6G1 (triode), 6G2 (triode): 6G7 (triode), 6I1P (triode), 6F1P, 6F3P (triode), 6F4P (triode), 6F5P (triode), 6F6S, 12G1 (triode), 12G2 (triode). 1.11. Zener diodes: SG1P, SG1P-EV, SG2P, SG2S, SG3S, SG4S, SG5B, SG5B-V, SG13P, SG15P-2, SG16P, SG20G, SG201S. 1.12. Frequency converter lamps: 6A2P, 6A7, 6L7. 2. Not in the mode of technical specifications for the lamp 2.1. Not in the technical conditions mode due to the magnitude of the alternating filament voltage controlled by the indirect method - diode 4C14C; triodes: 2X4S, 6X4S; dual triodes: 6H5S, 6H13S; Output pentodes: 6P13C, 6P31C; Generator lamps: GI-30, GU-29; cenotrons: 2C2C, 4C6C. 2.2. Not in the technical conditions mode due to the magnitude of the alternating voltages on the anodes controlled by the indirect method and due to the magnitude of the capacitance shunting the load resistance of the cenotron - Cenotrons: 6C4P, 6C4P-V, 6C5C. 2.3. Not in the mode of technical specifications due to the magnitude of the variable voltages of the filament and anode controlled by the indirect method - Cenotrons: 5C3S, 5C4M, 5C4S. 2.4. Not in the technical conditions mode due to the amount of resistance in the automatic displacement circuit - Dual triodes: 6N3P-I, 6N14P, 6N16B, 6N16B-V, 6N17B, 6N17B-V, 6N18B, 6N18B-V, 6N21B, 6N23P-EV; Triodes: 6S19P, 6S19P-V, 6S19P-VR, 6S29B-V, 6S32B, 6S35A, 6S35A-V, 6S51N-V, 6S52N-V; pentodes: 6J9G, 6J38P, 6P18P, 6F5P (pentode). 2.5. Not in the technical conditions mode due to the magnitude of the voltage on the grid. - frequency converter lamp 6A8. 2.6. Not in the technical conditions mode due to the magnitude of the ballast resistance in the anode circuit - The SG202B zener diode. 2.7. Not in the technical conditions mode due to the magnitude of the voltage on the grid of the first - frequency converter lamps: 1A1P, 1A2P. 2.8. Not in the mode of technical specifications due to the magnitude of the voltage on the grid of the third - heptode 6I1P. 2.9. The procedure for checking the parameters of lamps has been changed due to the absence of their nominal and maximum values in the technical conditions - Diodes: 2D1S, 4D5S, 6D3D, 6D4J, 6D6A, 6D6A-V; for dual diodes: 6X6C, 6X7B; the cenotron has 5C12P; the diode part of the lamps: 6B8, 6G1, 6G2, 6G7, 12G1, 12G2.