Set timer, 5 cutoff voltage – Lamar Technologies BETA D-50 User Manual

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4. DETAILED OPERATING INSTRUCTIONS

4.4.2 DISCHARGE TIME SETTING
The discharge time is usually set to 60 minutes, after which a pass/fail signal is given
based on whether the battery reached the cutoff voltage or not.

To determine the full capacity of the battery a longer time can be set (several hours). The
Beta D-50 will then continue the discharge test only until the cutoff voltage has been
reached. The timer, cutoff voltage and discharge current displays will freeze at this point.
The capacity can be calculated as the product of the discharge current and the time
passed until the voltage cutoff was reached.

C.

SET TIMER

Set the timer by pushing buttons up or down to the
required discharge time (usually 60 minutes)


CAUTION. For lead-acid batteries the time and voltage cutoff
should be set with caution. If discharge continues too far
beyond the point of exhaustion it may be harmful to the
battery, unless the battery is soon to be recharged.

4.5 CUTOFF VOLTAGE

The Beta D-50 will automatically stop the discharge test when the cutoff voltage has
been reached. The cutoff voltage is set so that if the battery voltage is higher than the
cutoff voltage when the discharge time has expired, the battery has passed the capacity
test.

4.5.1 LEAD-ACID BATTERIES
Always refer to your battery manufacturer's maintenance manual for the most accurate
information. For a 24 volt sealed lead-acid battery the cutoff voltage is usually set at 18
or 20 volts when discharged one hour at a current equal to the 80% of the battery’s C

1

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rate. See table 4-2 for examples of discharge test settings for sealed lead-acid
batteries.

BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

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