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Elma BM878
side 51
Disabling Auto-Power-off
Press the SELECT button while turning the meter on to temporarily disable the Auto-
Power-Off 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
Calibration
Accuracy is specified for a period of one year after calibration. Periodic calibration at
intervals of one year is recommended to maintain meter accuracy.
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 input protection resistors may 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 input protection resistors and the
spark-gaps (or varistors) 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: Four 1.5V AA battery (IEC LR6)
Fuses use:
Fuse (F2) for /mA input:
0.4A/1000Vac & Vdc, IR 30kA or better, FF fuse;
Dimension: 6 x 32 mm
Fuse (F3) for Earth Continuity Test input:
0.25A/1000Vac & Vdc, IR 30kA or better, FF fuse;
Dimension: 6 x 32 mm
Battery and Fuse replacement:
Loosen the screws from the access cover of the case bottom. Lift the access cover.
Replace the batteries or fuse. Re-fasten the screws.
51


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