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Elma 22 - 25 - 27 Page 47
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).
Press
SELECT
button momentarily selects the lowest 600Ω 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 μA position. The display-reading unit is in μA although
there is no unit annunciator on the display. DC-μA is the default function. There is no
annunciator for DC. Press
SELECT
button momentarily to select AC-μA. 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.
48


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