Elma 22 - 25 - 27
side 36
Press
SELECT
button momentarily selects the lowest 600
Ω
range for lower resistance
measurements. It is an extended range to complement the AutoCheck
TM
Resistance (
Ω
) function.
-DC-
μ
A & AC-
μ
A Micro-Amp functions (BM27 only)
Rotate the rotary selector to the
μ
A position. The display-reading unit is in
μ
A although there is no
unit annunciator on the display. DC-
μ
A is the default function. There is no annunciator for DC. Press
SELECT
button momentarily to select AC-
μ
A. The AC annunciator “
” turns on. These ranges,
like other functions, are protected up to the maximum rated voltages of the meter.
-DCV & ACV functions (BM22 only)
Rotate the rotary selector to the V position selects common impedance (Hi-Z) voltage measurements.
DCV is the default function. The DC annunciator “
” turns on. Press
SELECT
button
momentarily to select ACV. The AC annunciator “
” turns on.
-Resistance, Continuity, Diode & Capacitance functions (BM22 only)
Rotate the rotary selector to the
Ω
/
/
/
position. Resistance “
Ω
”is the default function.
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 (BM22 only)
Rotate the rotary selector to the Hz position selects Frequency function.
*
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.
4-3) OTHER FEATURES
-Power On & Off
For models BM27 and BM25, 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 BM22, rotate the rotary selector to turn the power ON or OFF.
-Auto Power Off
Models BM27 and BM25 turn off intelligently after approximately 3 minutes of idle measurement
readings and no button/switch activities. Model BM22 turns off automatically after approximately 30
minutes of only no button/switch activities.
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