Manual

Gossen Metrawatt GmbH 75
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 UL/RL 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 approximately 1 mA
at a voltage of 1000 V. The resultant perceptible shock may lead
to injury (e.g. resulting from a startled 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’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.
Attention!
!
Do not disconnect the DUT until less than 10 V is displayed for
U!
Evaluating 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 100. These values take maximum device error into
consideration (under nominal conditions of use). Intermediate val-
ues can be interpolated.
16.2 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
Connection and Test Setup
➭ Rub the floor cover-
ing 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).
R
ISO
Limit Value:
RE(INS) > Limit Value
U
L
 R
L
R
EINS
Voltage type: constant
Test voltage: 50, 100, 250, 325, 500, 1000 V*
Voltage type: rising/ramp
Earth leakage
* Freely adjustable voltage (see section 10.8)
resistance: