34 GMC-I Messtechnik GmbH
Special Condition for Insulation Resistance Measurement
Insulation resistance can only be measured at voltage-
free objects.
If measured insulation resistance is less than the selected limit
value, the LIMIT LED lights up.
If an interference voltage of
25 V is present within the system,
insulation resistance is not measured. The MAINS/NETZ LED lights
up and the “interference voltage” pop-up message appears.
All conductors (L1, L2, L3 and N) must be tested against PE!
Do not touch the instrument’s terminal contacts during
insulation resistance measurements!
If nothing has been connected to the terminal contacts, or if a
resistive load component has been connected for measurement,
your body would be exposed to a current of approximately 1 mA
at a voltage of 1000 V. However, the resultant perceptible shock
may lead to injury (e.g. resulting from a startled reaction etc.).
Discharging the Device Under Test
If measurement is performed at a capacitive object such
as a long cable, it becomes charged with up to approx.
1000 V! Touching such objects is life endangering!
When an insulation resistance measurement has been performed
on a capacitive object it’s automatically discharged by the instru-
ment after measurement has been completed. Contact with the
device under test must be maintained to this end. The falling volt-
age value can be observed at the U display.
Do not disconnect the DUT until less than 10 V is displayed for U!
Evaluation of Measured Values
Instrument measuring error must be taken into consideration in
order to assure that the limit values set forth in DIN VDE regula-
tions are not fallen short of. The required minimum display values
for insulation resistance can be determined with the help of Table
3 on page 54. These values take maximum device error into con-
sideration (under nominal conditions of use). Intermediate values
can be interpolated.
11.2 Special Case: Earth Leakage Resistance (REINS)
This measurement is performed in order to determine electro-
static discharge capacity for floor coverings in accordance with
EN 1081.
Select the Measuring Function
Set Parameters
* Freely adjustable voltage (see section 5.7)
Connection and Test
Setup
➭ Rub the floor covering at the point at which measurement is to
be performed with a dry cloth.
➭ Place the 1081 floor probe onto the point of measurement and
load it with a weight of at least 300 N (30 kg).
➭ Establish a conductive connection between the measuring
electrode and the test probe and connect the measuring
adapter (2-pole) to an earth contact, e.g. the earthing contact
at a mains outlet or a central heating radiator (prerequisite:
reliable ground connection).
Start Measurement
The limit value for earth leakage resistance from the relevant reg-
ulations applies.
Limit Value:
RE(INS) > limit value
LIMIT
R
EINS
Voltage type: constant
Test voltage
:
50 V / 100 V / 250 V / 325 V / 500 V / 1000 V*
Voltage type: rising/ramp
Earth leakage
resistance:
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