The input network consists of R1, R2, R3 and experimental circuits. This network provides an input voltage for the base of Q1A, the level of which depends on the resistance of the experimental circuit. The output of the emitter outputter Q1A applied to one side of the differential amplifier is compared with the reference voltage generated by R10 and R11, and is isolated from the differential amplifier transistor Q2B by the emitter follower QtB. The differential amplifier output on the Q2A collector is used to excite the level indicator Qs. This indicator reference level is held constant by Zener diode D1. When the resistance of the experimental circuit is greater than the nominal value, the output on the collector of Q3 is a positive voltage, and when it is less than the nominal value, the output is low.
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