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Millivoltmeter "B3-38" since 1979 produced the Tallinn plant "Punane-RET". Millivoltmeter "VZ-38" is designed to measure AC voltage from 0.1 mV to 300 V in the frequency range from 20 Hz to 5 MHz. The range of measured voltages from 100 µV to 300 V overlaps the sub-bands of 1, 3, 10, 30, 100, 300 mV, 1, 3, 10, 30, 100, 300 V. AC power supply with voltage of 220 V. Power consumption 10 V "¢ BUT. Weight 3 kg. Since 1986, the plant produced millivoltmeters "B3-38A", "B3-38B" and "B3-38V". The millivoltmeter "B3-38A" is designed to measure the root-mean-square value of the AC voltage of sinusoidal form from 0.1 mV to 300 V in the frequency range from 20 Hz to 5 MHz. The range of measured voltages: 100 µV - 300 V, overlapped by subranges with upper limits 1; 3; ten; thirty; 100; 300 mV; one; 3; ten; thirty; 100; 300 V. Frequency Working Area: 45 Hz-1 MHz; 20-45 Hz; 1-3 MHz; 3-5 MHz, graduation frequency: 1 kHz. The basic error of the device, expressed as a percentage of the external limit of the set measurement range, is no more than ± 2.5%. Power consumption: 6 V * A. Power supply: 220 V. Continuous operation of the device: 8 h. Mass: 3.2 kg. Dimensions: 152x206x275 mm. The millivoltmeter "B3-38B" is designed to measure the root-mean-square value of the AC voltage of a sinusoidal form and linearly convert it into a DC voltage. The scales of the device V3-38B are calibrated in rms values "‹"‹of sinusoidal voltage and in decibels. Frequency range: 20 Hz-5 MHz. The range of measured voltages: 0.1 mV-300 V. The limits of the basic error of voltage measurement (in% of the final subrange value): ± 2.5. Input impedance / capacitance: 4 MΩ / 25 pF (1-300 mV); 5 MOhm / 15 pF (1-300 V). Power supply: 220 V. Power consumption: 5.5 V * A. Dimensions: 152x206x275 mm. Weight: 3 kg.