2
INTERNATIONAL ELECTRICAL SYMBOLS
!
Caution ! Refer to the explanation in this Manual
Caution ! Risk of electric shock
Earth (Ground)
Double Insulation or Reinforced insulation
Fuse
AC--Alternating Current
DC--Direct Current
3) CENELEC DIRECTIVES
The instruments conform to CENELEC Low-voltage directive 2006/95/EC and Electromagnetic compatibility
directive 2004/108/EC
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
Warning: Before and after hazardous voltage measurements, test the voltage function on a known source such as
line voltage to determine proper meter functioning.
4-
1) FUNCTIONS IN “Auto V.
” POSITION (
Models 27s, 25s
& 25a
only)
-Quick Start (
Models 27s
,
25s
& 25a
only)
AutoCheck
TM
mode is the default function in
“
Auto V.
” position.
Press the SELECT button momentarily to select
and step through the functions:
AutoCheck
TM
→Continuity→EF→ACV→DCV→
→Hz→Cx→AutoCheck
TM
-AutoCheck
TM
mode (
Model 27s, 25s
& 25a
only)
This innovative AutoCheck
TM
feature automatically selects measurement function of DCV, ACV or Resistance (
)
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
is present, the meter displays the resistance value. When
below 25
is present, the meter (
Model 27s
only) 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
Model 25s
& 25a
) 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
Model 25s
& 25a
) is present, the meter displays
“OL” with a warning beep tone. Disconnect the test leads from the signal immediately to avoid h
azards.
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 (
Models 27s & 22s
only) for making voltage measurements on them.
-Continuity, Audible With Symbolic Display (
Models 27s, 25s
& 25a
only)
From AutoCheck
TM
with “Auto” being displayed, p
ress 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.
