Gossen MetraWatt 702 - Manual (Page 14)

14 GOSSEN METRAWATT GMBH
7 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:
• Type of connection:
– With plug (“to test socket” parameter), applies to EL1 adapter as well
– Without plug, single or multi-phase connection
(“to jacks” parameter), only with feature F01
– No connection to tester (“permanent connection” parameter)
• Whether or not an adapter is used:
– Adapter to socket (customer specific adapter)
– AT3-med to socket, adapter for devices
which are equipped with 5-pole, 16 A CEE plugs
– AT3-III to socket, adapter for devices
which are equipped 5-pole, 32 A CEE plugs,
see AT3-III operating instructions for test sequence.
• The DUT’s safety class (I, II or III)
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 jacks 1 through 3. If the instrument is equipped with feature
B00, 01 or 03, the instrument also recognizes whether or not a DUT has
been connected to the test socket. As a default setting, the program
sequence assumes that the plug from the DUT has been connected to
the test socket.
Note
☞
Safety Class II Devices with Safety Class I Mains Plugs
If the device under test is equipped with a safety class I plug
although it complies with safety class II, safety class I is recog-
nized by the test instrument. If this is the case, switch from safety
class I to safety class II in the initial menu.
If the test instrument is unable to automatically recognize how the DUT
has been connected, the recommended connection setup should be
double checked and determined manually if necessary.
➭ Position the
cursor at the second line in the start menu for the test
sequence.
➭ A selection of possible connection setups can be displayed by activat-
ing the key.
➭ Select the desired connection setup with the cursor and
acknowledge with the key .
Omitting the Protective Conductor Test in the Case of Fully Insulated Devices
You are testing a fully insulated safety class I device (e. g. screen, sub-
mersible pump, etc.), which is not equipped with an external protective
conductor contact.
The decision as to the necessity of a protective conductor test in this case
is to be taken by a qualified electrician who should also assume responsi-
bility.
You can omit the protective conductor test by pressing the key as
soon as the following instruction is shown: „Please connect the probe
with the protective conductor of the DUT“.
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 instrument!
➭ Remove the mains fuses from the device under test and disconnect
the neutral conductor N inside the device under test.
Measuring Contact Current (absence of voltage)
Make sure that the contacted parts are not grounded.