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Elma 22 - 25 - 27 Page 46
-
Electric Field EF-Detection (BM27 & BM25 only)
From AutoCheck
TM
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
TM
In Manual Selection (BM27 & BM25
only)
From AutoCheck
TM
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
TM
. Such selected function remains auto-ranging.
-Frequency And Capacitance (BM27 & BM25 only)
From AutoCheck
TM
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 AutoCheck
TM
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 & 600
Ω
functions (BM27 only)
Rotate the rotary selector to the /600Ω position.
47


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