4.6 Automatic measurement:
Automatic measurement is suitable only for resi-
stance measurements of
< 10
Ω
. They are performed
with a measurement current of
200 mA
(tests
comply with VDE 0413 part 4).
hold button
+/-
pressed until POL +/- LEDs light
up quickly and “AuTo“ appears on the display.
short press button to start automatic
measurement.
measuring takes approx. 3 seconds, with
automatic pole changing.
after measuring press button
+/-
to switch
between the lowest measured resistance
value with + polarity and – polarity.
The device stores both measurement values until
a new measurement. To perform further measure-
ments shortly press button
.
To get back to standard measurement press
button
+/-
until POL +/- LEDs light up quickly
and “AuTo“ disappears from the display.
Error:
If the device does not display any measurement
values evaluation can occur outside of the selected
measurement range, e. g. if the test probe slips or if
strong fluctuating impedances have influence.
You may have to repeat measuring. If repeated
measurements do not provide clear results you need
to perform long standard measurements with both
polarities and you must evaluate the measurement
values on your own.
4.7 External voltage
If the EP 4 is
switched on
and comes into contact
with a voltage (15 to 400 V) you hear an acoustic
warning and the red LED flashes. For informational
purposes the voltage value is displayed on the LCD.
Attention!
Button
may not be pressed
during the con-
nection, otherwise the device can be damaged by
external voltage. Semiconductors protect the device
up to 400 V.
With voltages > 400 V a fuse reacts that may only be
exchanged by the manufacturer. The fuse is checked
automatically during self-tests (see 3.).
Attention!
Make sure a voltage-free state in Ex-areas.
