4.2 Testing voltage and polarity
Attention!
Connect the voltage measurement tips to the
7-pin universal connector only when the device is
switched-off. Switch-on the device not until they are
locked and select rang if necessary.
Put both test prods with safe contact onto the
metering point and the voltage value is indicated
in the lower display line.
At a voltage of 12 V flashes the red LED and button
functions are locked.
Notes:
- If Hold appears permanently, probably the tip
has been attached when the device was switched-
on. Switch EXM off and on.
- Because of integrated multipliers the device indi-
cates few mV while in open-circuit operation, this
has no influence on the result of measurement.
- The EXM casing is made of conductive material.
We recommend unearthed operation for precise
voltage measurments >100 Hz.
Avoid contact with grounded parts, e.g. control
cabinet. For this purpose, the use of a leather bag
should be preferred.
1000 / 2000 V voltage range (1000 V) / (2000 V)
The voltage range adjusts automatically to the
used DATA-HOLD measurement tip EXM 72010 or
EXM 72011.
The measurement range serves for a fast detection
of measurement values between 0 – 1000 / 2000 V
without decimal places.
The display range of the VarioSafe EXM 25 extends
to 1160 V AC / 1610 V DC with EXM 72010 and 2 kV
with EXM 72011. Observe the safety precautions
(see section 2) for Ex-areas.
Automatic voltage range (AuTo)
The voltage range adjusts automatically to the used
voltage measurement tip EXM 72010 or EXM 72011.
The measurement range serves for a fast detection
of measurement values between 1 mV – 1000 /
2000 V, the optimal measurement range is selected
automatically.
Indication of polarity
Type of voltage is indicated by the symbols
~ and – . Direct voltage: is minus applied to the test
prod with Hold button, the leading sign „-“ appears,
is plus applied, no leading sign appears in front of
the indicated value.
23
