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Gossen Metrawatt PROFITEST MXTRA Manual

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46 GMC-I Messtechnik GmbH
Special Condition for Insulation Resistance Measurement
Attention!
!
Insulation resistance can only be measured at voltage-
free objects.
If measured insulation resistance is less than the selected limit
value, the U
L
/R
L
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!
Attention!
!
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 approx. 1 mA at a
voltage of 1000 V.
The noticeable shock may lead to injury (e.g. resulting from a star-
tled reaction etc.).
Discharging the Device Under Test
Attention!
!
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 is automatically discharged by the instru-
ment after measurement has been completed. Contact to 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 88. 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 (R
EISO
)
This measurement is performed in order to determine electro-
static discharge capacity for floor coverings in accordance with
EN 1081.
Select Measuring Function
Set Parameters
* Freely adjustable voltage (see section 5.7)
Connection and Test Set-
Up
➭ 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: re-
liable ground connection).
Start Measurement
The limit value for earth leakage resistance from the relevant regu-
lations applies.
R
ISO
Limit value:
RE(ISO) > limit value
U
L
R
L
R
EISO
Voltage type: constant
Test voltage : 50 V / 100 V / 250 V / 325 V / 500 V / 1000 V*
Voltage type: rising/ramp
Earth leakage
resistance:
… 46 …


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