Lamar Technologies CA 1550 - Manual (Page 32)

5. CALIBRATION AND MAINTENANCE
F. SWITCH ON MAINS POWER
Turn on the AC on-off/reset power switch.
The voltmeter reads battery terminal voltage,
the ammeter reads zero. The timer reads 0’s
and its red LED is off. The Charge Mode Lamp
indicator is illuminated.
G. SET CHARGE CURRENT
Turn the Ampere Adjust knob until
approximately 15 amperes has been reached.
The charge current is displayed on the
ammeter as the current is being adjusted.
NOTE: If the battery is already significantly
charged it may be hard to reach a 15 ampere
current.
H. CONNECT EXTERNAL
VOLTMETER
Set the voltmeter to a DC millivolt range.
Connect the external digital voltmeter into the
ammeter calibration points.
I. COMPARE AMPERE READINGS
Compare the CA-1550 digital ammeter
reading with the external calibrated
millivoltmeter. The external meter reads the
millivolt drop across a 50 ampere/50 millivolt
shunt. Every millivolt read on the external
millivoltmeter represents 1 ampere. The
readings should be within ± 0.2 millivolts
(amperes).
a. If readings differ less than ± 0.2 millivolts
(amperes), the ammeter is accurately
calibrated. Turn AC power off and disconnect battery.
CA-1550 CHARGER / ANALYZER - OPERATING MANUAL V1.2 Page 30