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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
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
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 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 you must
evaluate the measurement values on your own.
4.5 External voltage
If the METRAOHM 413 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 in-
formational purposes the voltage value is displayed
on the LCD.
In this case, measurement must not be performed.
Attention!
Button
contact to the measuring point if there is an
absence of voltage. Otherwise the device may be
damaged.
Semiconductors protect the METRAOHM 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
pressed until POL +/- LEDs light
+/-
until POL +/- LEDs light up quickly
+/-
may only be pressed after establishing
to start automatic
to switch
+/-
.
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