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Elma BM 251-252-255-257
side 45
Disabling Auto-Power-Off
Press the SELECT button while turning the meter on to temporarily disable the Auto-
Power-Off (APO) feature. Turn the rotary switch OFF and then back on to resume.
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
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or
solvents. If the meter is not to be used for periods of longer than 60 days, remove the
battery and store it separately
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.
Battery and Fuse replacement
Battery use: 1.5V AAA Size battery x 2
Fuses use: Fuse (FS1) for µAmA current input: 0.63A/500Vac, IR 150kA, F fuse;
Fuse (FS2) for A current input: 10A/600Vac, IR 100kA, F fuse
45


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