Lamar Technologies CA 1550 - Manual (Page 26)

5. CALIBRATION AND MAINTENANCE
5 CALIBRATION AND MAINTENANCE
5.1 OVERVIEW OF CALIBRATION
The CA-1550 has been calibrated before shipment from the manufacturer. A
certificate of calibration with test instruments traceable to the National Institute of
Standards and Testing in accordance with MIL-I-45208A has been issued and is
enclosed in the back of this manual. Re-calibration is required 12 months after date
of first use. To ensure error-free operation over time the unit should be re-
calibrated every 12 months depending on usage and changes in surrounding
environment.
5.1.1 DIGITAL PANEL METERS
There are two main indicators that need be periodically calibrated: 1) the voltmeter;
and 2) the ammeter (see Figure 1-1 in Section 1). The CA 1550 is equipped with
two sets of test jacks for easy calibration of these digital display meters. In addition the
internal shunt, even though calibrated and certified by the shunt manufacturer,
could be verified.
5.1.2 TIMER
The timer is a very accurate crystal-controlled device (accurate to 1.0%), not prone
to error. It cannot be re-calibrated, but unless an extremely accurate time reading is
required, an accurate analog or digital stop watch is adequate to validate its
accuracy.
5.1.3 DISCHARGE CURRENT OPERATING RANGE
The CA-1550 discharge current operating range can be modified different than
factory-preset 50 amperes discharge current if necessary.
WARNING: Calibration should only be performed by trained personnel. If
performed incorrectly it could result in electrical shock leading to
injury or death.
5.2 VOLTMETER CALIBRATION
To calibrate the CA-1550 voltmeter, an external calibrated digital voltmeter is
required. The unit does not require a battery for this calibration. The circuit diagram
CA-1550 CHARGER / ANALYZER - OPERATING MANUAL V1.2 Page 24