A corresponding change in A2Q8 collector current occurs and the
RECORDER/LEVELER voltage across A2R41 automatically adjusts to maintain the
(2) Squaring Circuit.
circuit is shown in Figure 14. The squaring circuit includes diodes A1CR9-14
and resistors A1R42-54. Temperature compensation for the squaring circuit is
provided by A1CR15.
(3) The design of the squaring circuit is such that individual diodes
are normally reverse-biased.
The diodes are biased so that they conduct one
after another at discrete values of emitter voltage. This causes the emitter
collector current of A1Q11 is made to approximate a square law function, and
the meter indicates power on a linear scale.
(4) Zeroing. The resistance of the Metering Bridge is never balanced.
A small amount of unbalance must exist to provide error signal for the
operation of the feedback loop. The Metering Bridge