Elma 22 - 25 - 27
side 34
3) CENELEC DIRECTIVES
The instrument conforms to CENELEC Low-voltage directive 73/23/EEC and Electromagnetic
compatibility directive 89/336/EEC
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
→
Continuity
→
EF
→
ACV
→
DCV
→
Ω
→
Hz
→
Cx
→
AutoCheck
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 6M
Ω
is present, the meter displays the resistance
value. When below 25
Ω
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.
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