Lamar Technologies CA 1550 - Manual (Page 30)

5. CALIBRATION AND MAINTENANCE
5.3 AMMETER CALIBRATION
To calibrate the CA-1550 ammeter, an external calibrated digital voltmeter, set to
the millivolt range, is required as well as a discharged charged battery. The
millivoltmeter will read the millivolts dropped across the CA-1550 internal shunt
when a charge current is applied. The circuit diagram for the calibration can be seen
in Figure 5-2. The calibration steps are outlined below.
EXTERNAL CALIBRATED MILLIVOLTMETER
Figure 5-2. Circuit diagram for ammeter calibration
A. SWITCH OFF MAINS POWER
Turn off the AC on-off/reset power switch.
CA-1550 CHARGER / ANALYZER - OPERATING MANUAL V1.2 Page 28