General Radio Admittance meter model 1602
The Type 1602-B U·H-F Admittance Meter is a simple, flexible instrument for the measurement of admittance and impedance over a wide frequency range. As a null instrument the U·H·F Admittance Meter can be used to measure the conductance and susceptance of an unknown circuit directly. It can also be used as a comparator to indicate equality of one~ admittance to another, or degree of departure of one from the other. As a direct indicating device, in addition, it can be used to determine the magnitude of the reflection coefficient on a 50-ohm coaxial line or the magnitude of an unknown impedance from ratios of output voltages read on a meter.