Elma Instruments BM22s Bedienungsanleitung Seite 24

Elma 22s – 25a 23
4-3) Other Features
-Power On & Off
For BM25a, press and hold the SELECT button for 1 second and then release to turn the power
ON or OFF. Press and hold the SELECT button for approximately 6 seconds to master reset the
system to the default stage if in case the meter hangs up unexpectedly.
For model BM22s, rotate the rotary selector to turn the power ON or OFF.
-Auto Power Off
Model BM25a turn off intelligently after approximately 3 minutes of idle measurement readings
and no button/switch activities. Model BM22s turns off automatically after approximately 30
minutes of only no button/switch activities.
-HOLD and 30ms MAX features (BM22s 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 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 BM25a battery replacement:
*BM25a 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 and hold