User Manual

GMC-I Messtechnik GmbH 63
10.3 Connecting the DUT
➭ Connect the DUT to the test instrument in accordance with
the selected test sequence. 
– Test socket 
– Permanent connection 
– Adapter
Application note for AT-IIIE test adapter:
Please note that the pole reversal function is not active with the
applied test instrument if you use the AT3-IIIE adapter for the test-
ing of single-phase test objects (socket 3 / earthing contact plug).
In this case, all leakage current measurements must be per-
formed manually in both pole directions.
Switch position: A1 ... A7, AUTO
Connection depends on the type of D
UT (see the respective con-
nection type in the classification parameters tables).
Switch position A8
For testing extension cords in accordance with standards: con-
nection to the test socket via the following adapter:
– EL1: fo
r single-phase extension cords
– VL2E:
for single and 3-phase extension cords
10.4 Selecting a Test Object
➭ If no DUT has been selected in the initial display, enter its ID
number, for example by means of a barcode scanner, after
selecting ID.
➭
MEM
As an alternative , activate the database view with the
MEM ke
y:
➭


Select the DUT for the test sequence with the scroll keys. 
➭
MEM
Return to the measuring view by pressing the MEM key.
10.5 Checking Connection and Starting the Test Sequence
➭ Trigger the connection test and the test sequence
by pressing the START key. 
The following checks are run automatically before the
t
est sequence is started:
•Probe test 
(whether or not test probe P1 is connected)
• Insulation test (whether or not the DUT
is set up in a well-insu-
lated fashion)
• On test and short-circuit test 
(prerequisite: “short-circuit test L-N” sequence parameter is
pr
eset to “on”. 
In order to be able to detect a short-circuit at the DUT, testing
is conduc
ted between L and N, as well as LN and PE.
Note
If you deselect important test steps under sequence param-
eter (set to off), the test sequence might not fulfill the require-
ments stipulated by the standard any more.
If you have set the “ Detected classification ” parameter for the
respective test sequence to “Alwa
ys accept” and the “ Auto-
detection of
” parameter to “ Connection and PC ” (before trig-
gering St
art), the following additional checks will be run
before the test sequence is started:
• Protection class detection for DUTs with protective conductor *
• Connection check *: check whether or not the DUT is con-
nected to the test socket. In the case of protection class I:
wh
ether or not the two protective conductor terminals are
short-circuited.
* applies to M7050 with feature B00, B09 and B10
10.6 Executing and Evaluating Test Steps
Manual Evaluation of Visual Inspection
(prerequisite: “visual inspection” sequence parameter is preset to
“on”.
➭ Evaluate the visual inspection.
➭ If you mark even one visual inspection as not passed
with the key shown at the right, the sequence is aborted and
the test is evaluated as not passed.
➭ Resume the t
est sequence.
Test Steps with Manual Evaluation (e.g. R
PE
)
➭ Observe instructions which appear at the display, e.g.
prompting to contact parts with test probe P1.
If the measured value appears green at the
display, it lies within
the limits specified by the standard.
➭
0
The measured value recording symbol appears in the
softkey bar. The 0 indicates that no measured values
ha
ve thus far been saved to buffer memory.
➭ Each time
this key is pressed, the measuring or evaluation
procedure is restarted.
➭ Initially, the digit blinks (here a 1 without symbol) until
the measured value settles in. The evaluation cycle is
visualized as follows: the progress bar starts at the left-
hand edge of the display and moves to the right. When
it reaches the rightmost position, evaluation has been
completed and the symbol shown at the right appears
with the current number.
1
1
➭ Depending on whether you want to delete the last
value saved to the clipboard or all values, press the
symbol with the wastebasket shown at the right an ap-
propriate number of times.
➭ Proceed to the next measurement by pressing the key
shown at the right.
Note
If the measured value appears red at the display, a
limit value has been violated. If you nevertheless
start the evaluation procedure, an error message
appears. You have the option of repeating the evaluation
procedure.
Note
Regarding the test sequence in switch position A6/A7: 
Section 5.2 of DIN EN 90974-4 expressly stipulates that
the cabl
es have to be bent and twisted over their entire
length during the measurement, in particular in proximity
to the cable glands, in order to be able to detect any
interruptions of the protective conductor.