User Manual

16 GMC-I Messtechnik GmbH
6 Connecting the Device Under Test
➭ Connect the DUT in accordance with the schematic diagrams
included in the online help function.
Connection of the DUT to the test instrument depends upon:
• The type of DUT:
For direct connection to the test socket (PD)
Devices with single-phase connection,
as well as extension cords via the EL1 adapter
(in which case the EL1 is connected to probe sockets P1)
For permanent connection (to the mains)
by contacting the housing with the probe
(for measurement of protective conductor resistance or with
the direct measuring method for the touch current measure-
ment)
For connection via adapter
– With single-phase extension cords via the EL1 adapter
(in which case the EL1 is connected to probe sockets P1)
– With single and 3-phase extension cords
via the VL2E adapter to
the test socket
– Devices with 5-pole, 16 A CEE plug
via the AT16-DI differential current adapter to the test socket
– Devices with 5-pole, 32 A CEE plug
via the AT32-DI differential current adapter to the test socket
• DUT protection class (PC I, PC II or PC III) or any combinations
of protection classes
Note
The DUT must be switched on for all tests. Switches,
relays, temperature regulators etc. must all be taken into
consideration.
The test instrument automatically recognizes whether or not the
DUT is connected to the test socket. As a default setting, the pro-
gram sequence assumes that the plug from the DUT has been
connected to the test socket.
6.1 Residual Current Monitoring
For your safety, the test instrument is equipped with continuous
residual current monitoring. If residual current exceeds a specified
limit value, all measuring processes are stopped, and if line volt-
age is fed through the test socket it’s disconnected. This limit
value can be set to one of two levels in the SETUP switch position:
Setup 1/3 > All Measurements > Residual Current > 10 mA /30 mA
6.2 Specifying a Reference Line Voltage
The reference line voltage is the voltage to which the measured
values for leakage current have been standardized.
The reference line voltage required for certain measurements can
also be adjusted:
Setup 1/3 > All Measurements > Ref. Voltage L-PE
6.3 Manually Specifying the Connection Type for Single Mea-
surements
If the test instrument is unable to detect the respective connection
type (e.g. test socket), the suggested connection type must be
examined and the connection type must be specified manually if
necessary.
➭ Select parameter settings.
➭ After selecting the measurement type, a list of possible connec-
tion types is displayed.
➭ Select a connection type.
Once a connection type has been selected, it remains active for all
following tests until it’s changed once again.
6.4 Manually Selecting a Connection Type / Protection Class
for Automatic Test Sequences
If the test instrument is unable to detect the respective connection
type or protection class, the suggested connection type must be
examined and the connection type or protection class must be
specified manually if necessary.
➭ Press the Sel key shown to the right in order to display
the classification parameters.
➭ After selecting the protection class or connection type pa-
rameter, a list of possible settings is displayed.
➭ Select the respective parameter.
➭ Acknowledge the Class. Param. (classification parameters)
once again.
The connection type appears at the middle of the header.
The symbol for the respective protection class appears to the
right of the connection type.
Once a connection type or a protection class has been selected, it
remains active for all following tests until it’s changed once again.
6.5 Special Conditions
Note
Protection Class II Devices with Protection Class I Mains Plugs
If the device under test is equipped with a protection
class I plug although it complies with protection class II,
protection class I is recognized by the test instrument. If
this is the case, switch the protection class parameter
from I to II.
Testing Several Protective Conductor Connections with the Func-
tion for “Automatic Detection of Measuring Point Changes”
During protective conductor measurement, the test instrument
recognizes whether or not test probe P1 is in contact with the
protective conductor, which is indicated by means of two different
acoustic signals.
This function can be adjusted in the SETUP switch position in the
“Auto Measurements” submenu via the “Auto Measuring Point”
parameter.
Protective Conductor and Insulation Resistance Measurements for
Permanently Installed Devices Under Test
Attention!
!
Deactivate the electrical system which supplies power to
the device under test before connecting the test instru-
ment!
➭ Remove the mains fuses from the device under test and dis-
connect neutral conductor N inside the device under test.
Touch Current Measurement (absence of voltage)
Make sure that the contacted parts are not grounded.