Lamar Technologies CA 1550 - Manual (Page 13)

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VII. VERIFYING METER READING (NOT CALIBRATION)
1. GENERAL: The CA 1550 has been factory calibrated prior to shipment and
the unit can be checked for verification of readings of the voltmeter and
ammeter with a Fluke 77/AN multimeter. The ampere-hour meter and
ammeter must be checked with a load.
2. CHECKING THE VOLTMETER WITHOUT THE BATTERY CONNECTED:
a) On / Off switch OFF (10).
b) Charge / Discharge switch to Charge (11).
c) Charge Current Adjust Max. (5).
d) Insert external DC Voltmeter leads into the panel volts test points (7).
e) On / Off switch to On (10).
f) Verify that the panel meter and test meter such as fluke 77/AN on the DC
Volts scale read within + - 0.3 Volts.
g) Adjust Voltage to confirm that the readings coincide over a voltage range
e.g.:22-30 Volts.
h) Reset Voltage adjust as required when the check is completed e.g.: 28.5
Volts.
3. CHECKING VOLTMETER WITH THE BATTERY CONNECTED:
a) Perform as above, except start with the Charge Current Adjust (5) set to
minimum. Increase current to increase and check the voltage. (Do not exceed
any maximum current requirements).