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Detector amplifier
Receiver power
supply temperature
PCB
Convert small
current from ion
chamber to voltage
24 VDC to ± 12
VDC
none
± 12 VDC on
receiver backplane
Monitor
background voltage
and check ± 12
VDC
± 12 VDC output
bad
Loose lead to
detector amp
Offset
(background)
voltage wanders
Thermal drift of
amplifier
Damage to wire
that connect ion
chamber to detector
amplifier
± 12 VDC output
on receiver
backplane
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