Thermistor bridge '' M4-2 ''.
Instruments for adjusting and controlling the PTA.The "M4-2" thermistor bridge was produced presumably since 1965. It was a part of the "M3-10" power meter, but it was also supplied separately. Serves for measuring low power of continuous and pulse modulated microwave oscillations using thermistor heads. The frequency range in which measurements can be made is determined by the heads. Measurement limits: 150; 500; 1500; 5000; 7500 μW. The principle of operation is based on automatic replacement of the absorbed microwave power with a direct current power equivalent in thermal effect to the measuring working thermistor.
