Maintenance - Amprobe AM-140 User Manual

12
Hold
The hold function freezes the display for later view. Press the HOLD button
momentarily to activate or to exit the hold function.
Set Beeper Off
Press the Hz button while turning the meter on to disable the push button operating
beeper feature. However, the continuity and Jack Beep input warning features remain.
Intelligent Auto Power Off (APO)
The Intelligent Auto Power Off (APO) mode turns the meter off automatically to extend
battery life after approximately 17 minutes of no activities. Activities are specified as: 1)
Rotary switch or push button operations, and 2) Significant measuring readings of
above 10% of range or non-OL Ω readings. In other words, the meter will intelligently
avoid entering the APO mode when it is under normal measurements. To wake up the
meter from APO, press the RECORD button momentarily or turn the rotary switch to
the OFF position and then turn back on again. Always turn the rotary switch to the OFF
position when the meter is not in use.
Disabling Auto Power Off
Press the RANGE button while turning the meter on to disable the Auto Power Off
(APO) feature.

5) MAINTENANCE

WARNING
To avoid electrical shock, disconnect the meter from any circuit, remove the test leads
from the input jacks and turn OFF the meter before opening the case. Do not operate
with open case. Install only the same type of fuse or equivalent
Trouble Shooting
If the instrument fails to operate, check battery, fuses, leads, etc., and replace as
necessary. Double check operating procedure as described in this user's manual. If the
instrument voltage-resistance input terminal has subjected to high voltage transient
(caused by lightning or switching surge to the system) by accident or abnormal
conditions of operation, the series fusible resistors will be blown off (become high
impedance) like fuses to protect the user and the instrument. Most measuring functions
through this terminal 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.