Amprobe PM53A Automatic-Pocket-Meter - Manual (Page 10)

8
Troubleshooting
If the instrument fails to operate, check battery, leads, and replace battery as necessary. Double-
check operating procedure as described earlier in this manual.
If the display locks up, press the SELECT button for approximately 6 seconds to reset the
microprocessor.
If the instrument’s voltage-resistance input is subjected to high voltage transient (mostly caused by
lightning or switching surge to your system) by accident or abnormal conditions of operation, the
series fusible resistors will react (become high impedance) like fuses to protect the user and the
instrument. Most measuring functions through this input will then be open circuit. The series fusible
resistors and the spark gaps should then be replaced by qualified technician. Refer to the LIMITED
WARRANTY section for obtaining warranty or repairing service.
Battery Replacement
If the meter starts up with persistent resetting display or with low battery icon N turns on, replace
the battery. The meter uses one 3 V coin battery IEC-CR2032.
To replace the battery
1.
Turn off the meter.
2. Disconnect the test leads from live circuits.
3. Loosen the screwon the case bottom.
4. Lift the end of the case bottom nearest the input test leads until it unsnaps from the case top.
Replace the battery cover and tighten the screw. Recycle the battery using approved methods.
5. Replace the battery. Observe battery polarities with positive (+) faces up (towards the case
bottom). Replace the case bottom, and ensure that the snap on the case top (near the LCD side)
is engaged.
6. Replace and tighten the screw.
XWWARNING
To avoid electrical shock, disconnect test leads from live circuits before opening
the case. Do not operate with open case.