Elma Instruments BM22s Bedienungsanleitung Seite 23

multimeters. They are, in fact, more similar to that of most traditional analog multimeters. "LoZ"
will display on the LCD to remind the users in such cases. Although not likely, if such
impedance might damage your circuits, use the common impedance (Hi-Z) voltage mode
(BM22s only) for making voltage measurements on them.
-Continuity, Audible With Symbolic Display (BM25a only)
with "Auto" being displayed, press the SELECT button momentarily 1 time
From AutoCheck TM
to select Continuity function. The meter displays a symbolic open-switch display "
is ready. Continuity is convenient for checking wiring connections and operation of switches. A
continuous beep tone with a symbolic closed-switch display "
In noisy environments, it is helpful to "see" continuity measurements.
Electric Field EF-Detection (BM25a 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
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 (BM25a 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.
4-2) Other functions
-DCV & ACV functions (BM22s only)
Rotate the rotary selector to the V position selects common impedance (Hi-Z) voltage
measurements. DCV is the default function. The DC annunciator "
button momentarily to select ACV. The AC annunciator "
-Resistance, Continuity, Diode & Capacitance functions (BM22s
only)
Rotate the rotary selector to the Ω/
Press SELECT button momentarily selects Continuity function. The Audible annunciator "
turns on. Continuity is convenient for checking wiring connections and operation of switches. A
continuous beep tone indicates a complete circuit.
Press SELECT button momentarily AGAIN selects Diode test function. The annunciator "
turns on. 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). 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).
Press SELECT button momentarily AGAIN selects Capacitance function.
-Frequency function (BM22s only)
Rotate the rotary selector to the Hz position selects Frequency function.
Elma 22s – 25a
TM In Manual Selection (BM25a only)
/ / position. Resistance "Ω"is the default function.
" indicates a complete circuit.
" turns on. Press SELECT
" turns on.
22
" when it
"
"