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TM 55-6695-220-13&P
e.
Coarse And Fine Rheostats: Alternate adjustments of the COARSE AND FINE RHEOSTATS by the operator to
obtain a prescribed deflection of the VOLTMETER pointer standardizes the battery current flow through the tapped
voltage divider to compensate for an aging battery condition.
f.
Resistance And Voltage Function Switch: The operator, by rotating this multi-position RESISTANCE AND
VOLTAGE FUNCTION SWITCH, either activates the tapped voltage network or null-balance bridge by connecting these
circuits to the 1.5 volt battery. In other positions, it supplies 12 or 24 volt excitation to the aircraft resistance thermometer
circuit, by connecting these circuits to the 45 volt battery. Additional positions are available to provide either 2, 8 or 22
ohm precision resistors in series with the tapped voltage output.
1-6
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