Operating the at30 – Exide Technologies Section 94.40 User Manual

Page 41

OPERATING THE AT30

2.3.7. Adjusting the Voltmeter Accuracy

The AT30 voltmeter is adjusted at the factory to display the actual output
voltage within ±0.25%. If you replace any component that affects meter
accuracy, such as the main control PC board or

R4, you should readjust

the meter. This adjustment procedure is different from all others, because
the meter reading remains constant, while the output voltage of the
charger changes. Do this adjustment with a fully charged battery and with
no load connected.

First, use the

Edit procedure to adjust the float voltage to the desired

value. See Section 2.3.2 for instructions on setting the float voltage.
Second, press and hold the

key, then press the

EQLZ MTHD

key.

The

DC VOLTS

METER MODE

indicator will light, and the meter display

flashes the output voltage reading. Measure the output voltage of the
AT30 using a dc meter accurate to ±0.25% or better.

While watching the meter connected to the AT30 output (not the front
panel meter), press the

DOWN

key until the actual output voltage

matches the float setting on the front panel meter.

Each time you press

DOWN

, you change the AT30 output voltage by

a small amount. Continue to press

DOWN

until the actual output

voltage agrees with the front panel reading within ±1%

NOTE: Allow one or two seconds for the output voltage to stabilize
each time you press the

DOWN

key.

When you are finished adjusting the output voltage, the AT30 waits 5
seconds, then the display returns to normal operation.