Lamar Technologies BETA D-50 - Manual (Page 25)

5. CALIBRATION AND MAINTENANCE
D.
PLUG IN MILLIVOLTMETER
Plug in the external voltmeter into the ammeter calibration ports. Set it to a
millivolts setting (most voltmeters have a 300 mV setting).
E.
SWITCH ON MAINS POWER
Turn on the AC on-off/reset power switch. An audible alarm sounds, and
the Accept lamp illuminates. Meters read all 6's or 8's.
F.
SET TIMER
Set the timer by pushing buttons up or down to a time that will allow
calibration to be completed before the time runs out (for example 60
minutes).
G.
VIEW AND SET CUTOFF VOLTAGE
a. Press and hold the View Voltage Cutoff button. The set cutoff voltage
is shown on the voltmeter display.
b. Use a 1/16 inch (2 mm) slot blade precision type screw driver to adjust
the cutoff voltage. Set it to a value that will allow calibration to be
completed before the cutoff voltage is reached. For example 18 volts for a
24 volt battery or 9 volts for a 12 volt battery.
H.
PUSH START BUTTON
The audible alarm stops. The voltmeter displays the battery voltage, the
ammeter reads 0 and the timer starts. “OP” on the timer illuminates and
the red LED flashes.
I.
SET DISCHARGE CURRENT
Turn the Ampere Adjust knob clockwise to the rated ampere-hours, i.e. 40
amperes for 40 ampere-hour battery. The ammeter displays the current as
it is being adjusted.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 23