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Gossen Metrawatt GmbH
17.5
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 test
sequence is started:
•
Probe test
(whether or not probe P1 is connected and fuse link P1 is intact)
Attention!
!
If the fuse at test probe P1 is defective, all subsequent
measurements using this measuring path are incorrectly
evaluated as good!
•
Insulation test (whether or not the DUT is set up in a well-insu-
lated fashion)
•
On test and short-circuit test
(prerequisite: sequence parameter for “short-circuit test L-N”
is preset to “on”.
In order to be able to detect a short-circuit at the DUT, testing
is conducted between L and N, as well as LN and PE.
Note
If you deselect important test steps under sequence
parameters (set to off), the test sequence might not fulfill
the requirements stipulated by the standard any more.
If you’ve set the “
Detected classification
” parameter for the
respective test sequence to “Always accept” and the “
Auto-
detection of
” parameter to “Connection and SK” (before trig-
gering
Start
), the following additional checks will be run
before the test sequence is started:
•
Protection class detection for DUTs with protective conductor *
•
Connection test *: Checks whether the DUT is connected to
the test socket. In the case of protection class I: whether or
not the two protective conductor terminals are short-circuited.
* Applies to
M7050
with
feature B00 and B09
17.6
Executing and Evaluating Test Steps
Depending on their type, test steps may require further action.
This action may be executed automatically (e.g. automatic evalua-
tion), or it may require manual intervention on your part (e.g.
switching on mains voltage or evaluation of results).
All of these actions are described in this section.
Notes on Evaluation
Limit values have been entered for test sequences in accordance
with the standards. And thus a go/no-go evaluation takes place
during measurement based on worst-case assessment.
Note
The go/no-go evaluation of the measured values is per-
formed with greater accuracy than the value which
appears at the display, which may lead to the fact that,
due to the missing decimal places, a measured value
which appears at the display may seem to correspond
exactly to the limit value although it’s displayed as a limit
value violation due to the places to the right of the deci-
mal point.
Results:
•
Green:
The momentary measured value lies within the limits specified
in the standard.
•
Orange:
Further entries are required after the test step (e.g. cable
length), which are decisive as to whether or not the test has
been passed.
•
Red:
Limit value violation The measured value does not comply
with the specifications stipulated in the standard.
Note
Even if the DUT fails just one single measurement, the
test sequence is aborted and testing in accordance with
the selected standard is failed.
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.
➭
Continue the test sequence.
Connecting Line Voltage
Connecting line voltage to the test socket at the test instrument
and performance of a function test are only permissible if the DUT
has already passed the
safety test
(protective conductor resis-
tance and insulation resistance measurements)!
Do not start measurements at your test instrument unless it’s in
plain view. Do not connect line voltage to the test socket of your
test instrument before the surrounding area has been secured.
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.
Attention!
!
Danger of Electric Arcs and Damage to Surfaces
(feature G01 or G02 only)
High test current is applied during test steps of sequence pa-
rameter RPE IP with 10 or 25 A test current. It’s activated as
soon as the evaluation period starts and remains active until the
evaluation period has ended.
Maintain contact between the probe and the DUT for the entire
duration of the evaluation!
If the measured value appears green at the display, it lies within the
limits specified by the standard.
➭
The measured value recording icon appears in the soft-
key bar. The 0 indicates that no measured values have
thus far been saved to buffer memory.
➭
Each time this key is pressed, the measuring or evaluation
procedure is restarted.
0
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