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Elma BM 829 Manual

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Elma BM 82X & BM52X Page 77
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: Single 9V battery; NEDA1604G, JIS006P IEC6F22, NEDA1604A, JIS6AM6 or
IEC6LF22
Fuses use:
BM820 models:
Fuse (FS1) for μAmA current input: 1A/600Vac, IR 100kA, F fuse;
Fuse (FS2) for A current input: 10A/600Vac, IR 100kA, F fuse
BM520 models:
Fuse (FS1) for μAmA current input: 0.44A/1000Vac & Vdc, IR 10kA, F fuse;
Fuse (FS2) for A current input: 11A/1000Vac & Vdc, IR 20kA, F fuse
Battery replacement:
Loosen the 2 screws from the battery access door of the
case bottom. Lift the battery access door and thus the
battery compartment up. Replace the battery. Re-fasten
the screws.
Fuse replacement:
Loosen the 4 screws from the case bottom. Lift the end of
the case bottom nearest the input jacks until it unsnaps
from the case top. Replace the blown fuse(s). Replace
the case bottom, and ensure that all the gaskets are
properly seated and the two snaps on the case top (near
the LCD side) are engaged. Re-fasten the screws.
… 77 …


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