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The cathode (lamp) voltmeter "VKS-7b" has been manufactured since 1948 by the Gorky Plant named after Frunze and the Minsk Radio Plant. By design, devices from different factories are somewhat different. The voltmeter is designed to measure AC voltage with a frequency of 20 Hz to 100 MHz. Measurement limits from 0.1 to 150 V on five scales: 0-1.5; 0-5; 0-15; 0-50 and 0-150 V. Instrument accuracy 3% of full scale value on 5 scales with sinusoidal voltage. Measurement accuracy with DNE-2 divider no more than / -5%. The frequency error in the frequency range from 30 Hz to 50 MHz is no more / -1%, at a frequency of 100 MHz no more than / -3%. Input resistance: at low frequencies 4 mΩ; at a frequency of 10 MHz 450 kΩ; at a frequency of 50 MHz 300 kΩ. The dimensions of the device are 200x285x340 mm. Weight 11 kg.