Elma 22 - 25 - 27
side 37
-HOLD and
30ms MAX
features (BM22 only)
The Hold feature freezes the display for later viewing. Press the
HOLD (
MAX
)
button
momentarily to activate or to exit the Hold feature.
The Max feature captures voltage signals that have durations as short as 30ms (milliseconds) within
a single range, and has automatic up range capability. This mode is available in DCV & ACV
functions. Press the
HOLD (
MAX
)
button for 1 second or more to activate or to exit the Max
feature.
-Auto-ranging
If the function selected has more than one range, the meter will auto-range to the best range and
resolution. No manual ranging is required.
5) MAINTENANCE
WARNING
To avoid electrical shock, disconnect test leads from live circuits before opening the case. Do not
operate with open case.
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, leads, etc., and replace as necessary. Double check
operating procedure as described in this user’s manual
If the instrument voltage-resistance input has 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 be blown off (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 turns on, replace
the battery ASAP. The meter uses one 3V coin battery IEC-CR2032.
Before opening the case bottom, make sure the meter is switched off to avoid abrupt power reset to a
running meter system. Disconnect test leads from live circuits. Loosen the screw from the case
bottom. Lift the end of the case bottom nearest the input test leads until it unsnaps from the case top.
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.
Re-fasten the screw.
Note for BM27 and BM25 battery replacement:
*BM27 and BM25 use micro-controller (like a computer) to run the meter system. WHEN THE
METER IS POWER-ON, intermittence battery power failure (fast intermittence battery contact
interval in the order of millisecond) may cause the meter reset/re-startup abnormally. Simply press
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