GOSSEN-METRAWATT
17
5.6
Measuring Contact Current
Contact current measurement can be performed instead of insulation resistance measure-
ment for class II devices, or for class I devices with exposed conductive parts which are not
connected to the protective conductor.
➭
Connect the device under test to the mains outlet.
Attention!
!
The protective conductor test must first be performed and passed.
➭
Connect the cable with the test probe to the “2 mA” jack.
➭
Start up the device under test.
➭
Contact all exposed metal parts at the device under test with the test probe.
➭
Read the residual current value in mA from the display. This value may not exceed
0.5 mA.
Measurements must be performed with the mains plug poled in both directions. The larger of
the two measured values applies.
Note!
+
If no device under test is connected, random characters appear at the digital display
which may not be construed as measured values.
5.7
Measuring Residual Current (METRATESTER
â
5/5-F only)
Residual current (differential current) is measured between phase conductor L and neutral
conductor N at the device under test. This measurement may not be performed until the
protective conductor test has been passed (see chapter 5.3, page 15).
➭
Connect the device under test to the mains outlet.
➭
Set the measuring range selector switch to the I
Diff
position.
➭
Start up the device under test.
➭
Read the residual current value in mA from the display. According to
DIN VDE 0701:2000, the displayed current value may not exceed 3.5 mA, or 1 mA/kW
for devices with heating power equal to or greater than 3.5 kW.
Measurements must be performed with the mains plug poled in both directions. The larger of
the two measured values applies.
Note!
+
If no device under test is connected, random characters appear at the digital display
which may not be construed as measured values.
Note!
+
If the METRATESTER
â
5/5-F is integrated into a 3-phase ammeter, residual current is
measured as the sum of instantaneous current in conductors L1, L2, L3 and N.