126 U1253B User’s and Service Guide
5Maintenance
4 Insert the red (+) and black (–) banana plugs (4 mm
plugs) of the DC adapter to the and COM
terminals respectively. Ensure that the polarity of the
connection is correct.
5 The display will show a countdown timer of 10 seconds
for the self- test to start. The multimeter will output short
single- tone sounds to remind you to charge the battery.
Press to start charging the battery, or the
multimeter will automatically start charging after
10 seconds. It is recommended not to charge the battery
if the battery capacity is over 90%.
Figure 5-2 Self-testing time display
The DC adapter can be replaced with a DC power supply set at DC 24 V
with an overcurrent limit of 0.5 A.
Table 5- 1 Battery voltage and corresponding percentage of charges in standby and charging modes
Condition Battery voltage Proportional percentage
Trickle 6.0 V to 8.2 V 0% to 100%
Being charged up 7.2 V to 10.0 V 0% to 100%
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