Voltmeter `` VK7-6 ''.
Instruments for adjusting and controlling the PTA.The VK7-6 voltmeter has been produced since the 1st quarter of 1961 at the Punane-RET plant. The voltmeter is designed to measure the values of the sinusoidal voltage of LF and HF direct and alternating current, the magnitude of the direct current and the magnitude of the resistance to direct current. A more detailed description of the VK7-6 voltmeter is below.