User Manual

6 GMC-I Messtechnik GmbH
Testing With Tripping of the RCCB
➭ Connect the test probe from N to PE (see example in figure
3.12).
➭ Start the measurement by pressing the START key. Assure
good contact between the test probes and the device under
test while measurement is being performed!
After the measurement has been completed, the results are dis-
played as follows:
Key:
Z Measured impedance ()
Z x 1.5 Multiplier for measured impedance Z ()
I
K Short-circuit current calculated as: IK = 230 / (Z x 1.5) (A)
➭ Several seconds after the measurement cables have been re-
moved from the device under test, the test instrument is
switched back to the “~” function. In order to perform further
loop impedance measurements, the entire procedure in ac-
cordance with section 3.3.3 on page 5 must be repeated.
➭ In order to display additional measured/calculated values, pro-
ceed as described in section 3.3.2 on page 5, “Displaying Fur-
ther Measured/Calculated Values”.
Note: Contact PE with the mobile test probe. Press the START key. If
no voltage is present, loop impedance measurement is not
started. Assure that the test probes make good contact with L
and PE.
Make certain that:
– L and PE are contacted
– PE is securely connected
3.4 Automatic Evaluation of Measured Impedance
Automatic evaluation is only possible with the detailed representa-
tion.
• Protective device parameters are stored to memory or to the
database. Type, nominal current In and disconnection time ta
appear at the top of the display (see example in figure 2.5).
After pressing the T
A
key for the first time, disconnection time
ta and the smallest short-circuit current IFmin required for
shutdown appear at the bottom of the display.
• Another protective device type and nominal current can be
selected immediately after activating the T
A
key by pressing
and holding the DISP ▲ or DISP ▼ key. After selection, wait
about 5 seconds, after which the initial status for voltage mea-
surement is displayed.
• Another disconnection time can be selected immediately after
activating the T
A
key by pressing the T
A
key once again. After
selection, wait about 5 seconds, after which the initial status
for voltage measurement is displayed.
• If the symbol is displayed along with the results of the
impedance measurement after its completion, short-circuit
current calculated from impedance is greater than the mini-
mum short-circuit current required for triggering the selected
protective device.
However, if calculated short-circuit current is less than this
value, the symbol is displayed.
3.5 Further Device Functions
Phase Detection
If the symbol appears in the lower right-hand corner of the
display (see figures 2.4 and 2.5), and if a phase is contacted with
the fixed test probe, the symbol is changed to .
The other test probe may not be connected anywhere or make
any contact at all!
Note
As usual, the test instrument must be gripped in the
hand!
In order to obtain a correct display, the fixed test probe
must remain connected to the phase for at least 2 sec-
onds.
Phase voltage to ground must be  190 V / 48 to 52 Hz,
because the display will otherwise be incorrect.
Measuring Point Illumination with White LED
The LED can be switched on and off by briefly pressing the START
key.
No voltage may be applied to the test probes.
Selecting Brief or Detailed Representation, Information on Firm-
ware Version
➭ Press the START key to switch the instrument on while pressing
and holding the ~/RCD key. The version number appears at
the display, for example V 1.0.0, along with corresponding
symbols for the desired representation.
➭ Select the representation mode with the DISP
▲ (brief) or DISP
▼ (detailed) key. After selection, the instrument is switched
back to normal operation.
3.6 Device Reset Function
If the test instrument does not function as described in these
instructions, we recommend a device reset. The test instrument
must be switched off and neither of the test probes may be con-
nected to a DUT. If device functions are still incorrect after switch-
ing the instrument back on again, remove the batteries as
described in section 6.1 on page 9, wait at least 10 seconds and
then reinsert the batteries (or replace them with new ones).
If the test instrument still does not function as described, remove
the batteries and contact our service department.
Figure 3.21: Impedance Downstream
from an RCCB (brief)
Figure 3.22: Impedance Downstream
from an RCCB (detailed)
Figure 3.23: Display of Smallest Short-Circuit Current
for Shutting Down a B16 Breaker
Figure 3.24: Phase Display (brief) Figure 3.25: Phase Display (detailed)
Figure 3.26: Selecting Brief or Detailed Rep-
resentation, Firmware Version