Product Manual
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Turn‐On,SensitivityandVolumeSettings
Turn on the GA‐72Cd by rotating the On/Off‐Sensitivity control knob clockwise to position 1.
This sets the sensitivity to what is referred to as the Normal Range (the L meter indication).
Sensitivity can be increased by rotating the Sensitivity control clockwise to select
M, H, or XH
settings(asindicatedon the meter’s GAINdisplay).Adjustthe Volume controlforthe desired
audiooutputlevel.
ON/OFF HeadsetJack
Sensitivity (alsooutputfor
Levels DataLogger)
VolumeControl
MagneticField SignalStrength
Polarity (indifferentialmilligauss)
Selected
Sensitivity BatteryCharge
Level Indicator
Indicator
NegativePolarity PositivePolarity
ExpandingBarGraph ExpandingBarGraph
Figure2:ControlandMeterIndications
BatteryLevelIndication
The meter’s BATT indicationdisplays the batteries’voltagelevel.When all four segments are
black,thevoltagelevelisbetween100%and25%(upto40hoursofoperationwithintermittent
usage).Asthevoltagedecreases,thenumberofblacksegments
decreases.Batterylifevaries
with usage and the ambient temperature.Cold temperatures reduce battery life.Low
temperatures may result in only two or three segments being black; this could be temporary
andallsegmentswillchangebacktoblackasthetemperatureincreases.
100 to 25% 25 to 20% 20 to 10% 10 to 1%
Figure3:BatteryVoltageStatusIndications