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4.4.2 Automatic measurement 0 - 10 Ω
Tests with automatic mode comply with
EN/IEC 61557-4 .
Automatic measurement is suitable only for resi-
stance measurements till 10 Ω. They are performed
with a measurement current of 200 mA
Hold button
pressed until POL +/- LEDs light
+/-
up quickly and "AuTo" appears on the display.
Automatic mode is now ready.
Shortly press button
measurement.
The pole changing is carried out automatically.
After measuring press button
between the measured resistance
value with + polarity and – polarity.
The device stores both measurement values until a
new measurement is performed. To perform further
measurements 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 an evaluation could be caused by following
error:
The test probe slips
Heavily fluctuating impedances
Values outside of the selected measurement
range
You have to repeat measuring. If repeated measure-
ments do not provide clear results you need
to perform a number of standard measurements
with both polarities (see 4.4.1) and evaluate the
measurement values on your own.
4.5 External voltage
Attention!
Make sure a voltage-free state in Ex-areas.
This test must be carried out with an Ex-proofed
voltage tester not with the EP 4Ex!
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.
In this case, measurements must not be performed.
Attention!
Button
may only be pressed after establishing
contact to the measuring point if there is an
absence of voltage. Otherwise the device may be
damaged.
Semiconductors protect the METRALINE 413 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 3.2).
24
to start automatic
to switch
+/-
.
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