18
Wolfgang Warmbier GmbH & Co. KG
6.5
Measurement of Volume Resistance R
V
according to
IEC 61340-2-3
(e.g. for determining the volume resistance of a material)
➭
Connect the red measurement cable from the “+ Pole” to the
measuring electrode and the black, shielded measurement
cable with the double “COM / SHIELD” connectors to the
counter-electrode.
➭
Select a measuring voltage of U
M
= 10 V in the Resd switch
position. If a value of less than 1 M
is displayed, this value is
the result.
➭
If volume resistance Resd
1 M
is displayed with the 10 V
measuring voltage, the 100 V measuring voltage must be se-
lected. The value which is then displayed is the result
Measurement according to IEC 61340-2-3
6.6
Measurement with the GUARD Terminal
The measurement of very high resistances leads to extremely low
measuring current and may be rendered problematic as a result
of influences such as electromagnetic fields, humidity or surface
current. An accurate test set-up is thus absolutely essential.
A guard cable must be used for measurements within a range of
10 G
to 1 T
, in order to prevent surface current from distorting
measurement results. The GUARD terminal at the measuring
electrode prevents current on the surface of the high-impedance
material to be measured from flowing from the + measurement
cable to the – measurement cable instead of through the high-
impedance material itself.
Ring Electrode according to IEC 61340-2-3
➭
Connect the GUARD terminal at the measuring electrode to
the GUARD socket at the
METRISO 3000
when measuring very
high-ohmic materials
The measuring sequence is the same as described in the previ-
ous sections.
7
Test Resistor for Resistance Measurement for
Checking the High Resistance Tester
It’s advisable to check the measuring instrument before, and if
necessary after use.
The two outermost jacks on the connection panel must be con-
nected to each other internally via a 10 M
test resistor to this
end.
The sum of test resistor and cable resistance (for both cables),
including test probes, amounts to 10 M
±5%. This value allows
for quick self-testing.
➭
Connect the measurement cables to the
+
and
COM
jacks.
➭
Insert the test probes into the above depicted jacks.
➭
Within the R
ESD
measuring function, use the rotary switch to
select desired measuring voltage U
M
: 10 V, 100 V or 500 V.
➭
Press the start key and view the measurement results.
Resd in
Measuring Voltage
(open-circuit voltage)
Resd
1 x 10
6
10 V ± 0.5 V
Resd
1 x 10
6
100 V ± 5 V
+Pole
COM/SHIELD
DUT
+Pole
COM/SHIELD
Counter-Electrode
+Pole
GUARD
COM/SHIELD
+
COM
10M
+
COM SHIELD
R
ESD
10 M
