F-4.
Battery Monitoring Circuitry
The following does not apply to AMPTEC
620VN
.
The 620VN Igniter Tester display has a LOW
BATTERY LED indicator (dot) just to the left of the
meter's main 4 ½ digit numeric display. The LED dot
when lit is used as a Low Battery indicator. This
status is also available over the meter's optically
isolated RS232C serial interface. If the low battery
LED is illuminated, 620VN Series Igniter Tester
readings should not be trusted.
The AMPTEC 620VN is powered by an external
battery, if the meter indicates "LOW BATTERY" then
a freshly charged external battery should be supplied
or exchanged for the LOW or nearly drained battery.
Notice for Cal Lab:
The variable trimpot RV3 is
factory adjusted to have the
low battery indicator
come on at approximately 4.00 VDC.
Meters fitted with "OPT 247" Optically
Isolated Continuous operating power
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