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Elma BM 822 Manual

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Elma BM 82Xs &
BM52Xs
Page 49
CAUTION
Discharge capacitors before making any measurement. Large value capacitors should be
discharged through an appropriate resistance load.
Normal forward voltage drop (forward biased) for a good silicon diode is between 0.400V
to 0.900V. A reading higher than that indicates a leaky diode (defective). A zero reading
indicates a shorted diode (defective). An OL indicates an open diode (defective). Reverse
the test leads connections (reverse biased) across the diode. The digital display shows OL
if the diode is good. Any other readings indicate the diode is resistive or shorted
(defective).
A, mA, and A Current functions
Press SELECT button momentarily to select DC, DC
+AC
, DC+AC
+AC
and AC
+Hz
. Last
selection will be saved as power up default for repeat measurement convenience.
*Note: When measuring a 3-phase system, special attention should be taken to the
phase-to-phase voltage which is significantly higher than the phase-to-earth voltage. To
avoid exceeding the voltage rating of the protection fuse(s) accidentally, always consider
the phase-to-phase voltage as the working voltage for the protection fuse(s).
Electric Field EF-Detection (829s, 827s only)
At any function, press the EF button for one second or more to toggle to EF-Detection
feature. The meter displays “E.F.” when it is ready. Signal strength is indicated as a series
of bar-graph segments on the display plus variable beep tones.
●Non-Contact EF-Detection: An antenna is located along the top of the meter, which
detects electric field surrounds current-carrying conductors. It is ideal for tracing live wiring
connections, locating wiring breakage and to distinguish between live or earth
connections.
… 49 …


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