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Elma 22 - 25 - 27 Page 45
4) operation
Note: All function operations described hereafter are via the Red test lead for positive (+)
polarity and Black test lead for Ground reference (-), or otherwise specified
4-1) Functions in “Auto V.
Ω
” Position (BM27 & BM25 only)
-Quick Start (BM27 & BM25 only)
AutoCheck
TM
mode is the default function in
Auto V.Ω” position. Press the SELECT
button momentarily to select and step through the functions:
AutoCheck
TM
ContinuityEFACVDCV
Ω
HzCxAutoCheck
TM
-AutoCheck
TM
mode (BM27 & BM25 only)
This innovative AutoCheck
TM
feature automatically selects measurement function of DCV,
ACV or Resistance (Ω) based on the input via the test leads.
With no input, the meter displays “Auto” when it is ready.
With no voltage signal but a resistance below 6MΩ is present, the meter displays the
resistance value. When below 25Ω is present, the meter (BM27only) further gives a
continuity beep tone.
When a signal above the threshold of DC 1.2V or AC 1.5V up to the rated 600V (450V for
BM25) is present, the meter displays the appropriate voltage value in DC or AC, whichever
larger in peak magnitude.
Overload-Alert Feature:
When above rated 600V (450V for BM25) is present, the meter
displays “OL” with a warning beep tone. Disconnect the test leads from the signal
immediately to avoid hazards.
Note:
*Range-Lock Feature: When a measurement reading is being displayed in AutoCheck
TM
mode, press the SELECT button momentarily 1 time can lock the function-range it was in.
The LCD annunciator turns off. Range-lock can speed up repetitive
measurements. Press the SELECT button momentarily again to return to AutoCheck
TM
mode.
*Hazardous-Alert: When making resistance measurements in AutoCheck
TM
mode, an
unexpected display of voltage readings alerts you that the part under test is still energized.
*AutoCheck
TM
nominal input impedances are slightly lower than that of common digital
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
(BM27 and BM22 only) for making voltage measurements on them.
-Continuity, Audible With Symbolic Display (BM27 & BM25
only)
From AutoCheck
TM
with “Auto” being displayed, press the
SELECT
button momentarily
1
time
to select Continuity function. The meter displays a symbolic open-switch display
” when it is ready. Continuity is convenient for checking wiring connections and
operation of switches. A continuous beep tone with a symbolic closed-switch display
” indicates a complete circuit. In noisy environments, it is helpful to “see” continuity
measurements.
46


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