Universal tube voltmeter `` VK7-4 ''.
Instruments for adjusting and controlling the PTA.The VK7-4 universal tube voltmeter was presumably produced since 1962. Designed to measure AC and DC voltages and electrical resistance. The device is designed for use in laboratories and repair shops. Limits of measurement of DC voltages on seven scales: 0.5; 1.5; five; fifteen; fifty; 150 and 500 V. The error in DC current measurements at the 0.5 V limit does not exceed ± 4% of the upper measurement limit and ± 2.5% for the remaining limits. The input resistance of the voltmeter when measuring DC voltages is 25 Mohm. Limits of measuring AC voltages on five scales: 1.5; five; fifteen; 50 and 150 V. The frequency range of the device is from 20 Hz to 700 MHz. AC voltage measurement error: ± 4% at frequencies from 55 Hz to 30 MHz; ± 6% at frequencies from 20 to 55 Hz and from 30 to 75 MHz; ± 10% at frequencies from 75 to 400 MHz; ± 20% at frequencies from 400 to 700 MHz. The active input resistance of the voltmeter is 5 MΩ at a frequency of 1 KHz, 0.5 MΩ at a frequency of 10 MHz and 50 kΩ at a frequency of 100 MHz. The input capacitance of the probe is no more than 2 pF k with a screen of no more than 2.5 pF. Limits of measurement of active resistances on seven scales with a reading multiplier: 10; 100 ohm; one; 10; 100 rooms; 1 and 10 Mohm. The error in measuring resistances at the XY ohm limit does not exceed ± 4% of the length of the working part of the scale and ± 2.5% on the remaining limits. Power consumption does not exceed 80 watts. Dimensions: 330x255x230 mm. The weight of the device is no more than 10 kg.
