Elma BM22 Bedienungsanleitung Seite 36

Electric Field EF-Detection (BM27 & BM25 only)
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From AutoCheck with "Auto" being displayed, press the SELECT button momentarily 2 times to
select EF-Detection feature. The meter displays "EF" when it is ready. Signal strength is indicated as
a series of bar-graph segments on the display and variable beep tones.
●Non-Contact EF-Detection: An antenna is located at the top left corner 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.
●Probe-Contact EF-Detection: For more precise indication of live wires, such as distinguishing
between live and ground sockets, use the Red (+) test probe for direct contact measurements.
-V and Ω of AutoCheck
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From AutoCheck with "Auto" being displayed, press the SELECT button momentarily 3 times to
select ACV, 4 times to select DCV and 5 times to select Resistance (Ω) functions of AutoCheck
Such selected function remains auto-ranging.
-Frequency And Capacitance (BM27 & BM25 only)
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From AutoCheck with "Auto" being displayed, press the SELECT button momentarily 6 times to
select Frequency (Hz), 7 times to select Capacitance (F) functions and 8 times to return to
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AutoCheck mode.
Note:
*Unlike the Line Level Hz Frequency function (for BM27 only) as stated, this (Common) Hz
Frequency function is set only at the highest input sensitivity mainly for measuring small electronic
signals of below 20VAC rms.
4-2) OTHER FUNCTIONS
-DCV, ACV & Line-Level Hz functions (BM27 only)
Rotate the rotary selector to the V position selects common impedance (Hi-Z) voltage measurements.
DCV is the default function. Press SELECT button momentarily to select ACV. The AC
annunciator " " turns on. Press momentarily again to activate the Line-Level Hz function.
Note:
*Line-Level Hz input sensitivity varies automatically with ACV range selected when Line-Level Hz is
selected. AC 6V range has the highest and AC 600V range has the lowest sensitivity. Measuring the
signal in ACV function WHILE selecting Line-Level Hz function in that ACV range automatically
sets the most appropriate sensitivity for higher voltage applications. This can avoid electrical noises
as in 110/220V line voltage applications for example. If the reading shows zero due to insufficient
signal levels, select Line-Level Hz function BEFORE making measurements (at AC 6V range) will
set the highest sensitivity.
-Diode & 600Ω functions (BM27 only)
Rotate the rotary selector to the
Diode test is the default function. The reading shows the approximate voltage drop across the test
leads. 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), and the meter will give a long beep as continuity warning. 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).
Elma 22 - 25 - 27
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In Manual Selection (BM27 & BM25 only)
/600Ω position.
side 35
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