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TM 55-6695-220-13&P
c.
Lead Resistance Switch: Setting of the LEAD RESISTANCE SWITCH by the operator inserts a precision
resistor of either 2, 8 or 22 ohms into one leg of a null-galvanometer bridge circuit. The resistance and thereby condition
of the aircraft's thermocouple lead circuit may be determined by comparing it to this preselected resistance.
d.
Lead Resistance Error Adjust: The operator varies the LEAD RESISTANCE ERROR ADJUST while observing
the VOLTMETER pointer for a null condition. The error in resistance indicated on the dial either high or low represents
the difference in resistance between the preselected precision bridge resistor and that of the aircraft's thermocouple lead
circuit.
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