TM 10-6665-297-13&P1-3.3.2 Controls (continued)4.ChannelSelectorSwitch(CD802/832modules): Turned to AUTO mode: switches meter circuitryto respond to channel with strongest signal. Turned to channel 1 or channel 2 position: switchesmeter circuitry to respond to signal from selected channel. Alarm and warning circuits remainactive on both channels despite setting of channel selector switch.1-3.3.3 Adjusters(Figures1-19,1-22):1.VOLTAdjuster: Potentiometer with adjustment screw; labeled VOLT on printed circuit board;turned to adjust operating voltage applied to detector(s) from the voltage regulating circuitry of thecircuit board.2.ZEROAdjuster: Potentiometer with adjustment screw; labeled ZERO on printed circuit board;turned to adjust signal voltage for zero meter reading with fresh air (containing no combustiblegases or vapors) at the detector(s). The CD800/830 circuit board has one ZERO adjuster (Figure 1-19); the CD802/832 circuit board has two (one for each of the two independent signal channels,Figure 1-22).3.GAINAdjuster: Potentiometer with adjustment screw; labeled GAIN on printed circuit board;turned to adjust signal amplification for accurate percent L. E. L. meter readings of concentrationsof specific gas or vapor to be monitored. Also turned to compensate for gradual depletion ofcatalyst in the expendable detector sensor and the consequent slowly diminishing response. TheCD800/830 circuit board has one GAIN adjuster (Figure 1-19); the CD802. 832 circuit board hastwo (one for each of two independent signal channels, Figure 1-22).4.TESTSignalRangeAdjuster: Potentiometer with adjustment screw; labeled RANGE on theCD800/830 printed circuit board (Figure 1-19), and TEST on the CD802/832 circuit board (Figure 1-22). This adjuster is turned to obtain full-scale meter pointer deflection when the TEST pushbuttonis pressed.5.WARNSignalTriggerPointAdjuster :Potentiometer with adjustment screw; labeled WARN onprinted circuit board (all models, Figure 1-19, 1-22). This adjuster is turned to set a referencevoltage in a circuit that triggers the warning signal output circuitry when the gas signal rises to thewarning reference voltage level.23-96177/1/761-33
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