Lamar Technologies D-1560 - Manual (Page 9)

IV. CALIBRATION
Preface
A. The 5160 unit is microprocessor controlled with programmed functions
of operation and displays. There are no user calibrations procedures, only
verification of time, voltage, and current readings. Factory calibration requires
battery banks, variable power supplies, oscilloscope and calibrated test
instruments. Therefore, units which may be out of calibration or malfunction
should be returned to the factory. East coast and west coast tech reps are
available. See Tech Support on Section. VI
B. In order to verify operating accuracy, there are test points for the ammeter
and voltmeter, to connect to the user’s multi-meter. The ammeter test points,
connects to an internal shunt rated 100 amperes at 100 milli-volts. The volt
meter connects to the battery by sensing leads at the snap-in connector at the
end of the DC cable.
For amperes, a test multi-meter such as Fluke, must be set to the DC
milli-volt scale. Amperes are read as milli-volts directly. Multi-meter leads are
plugged into the amperes/MV test points (Fig 1, #10)
For volts, the multi-meter is set to DC volts. Leads are plugged into the
volts test points or additional verification can be taken directly at the battery
under test. For time readings, any quality digital timer may be used for
verification.
C. To verify the accuracy of the internal shunt and ammeter, a shunt rated
100 amps/ 100 milli-volts is connected in series with the DC cable and battery.
The shunt may be connected in either the positive or negative leg. The
milli-volt meter reads the shunt voltage which is equal to the DC amperes. This
shunt connector assembly can be obtained from Power Products. See Tech
Support Section.