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Gossen Metrawatt PROFITEST MXTRA Manual

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GMC-I Messtechnik GmbH 27
8.1 Measurements with Suppression of RCD Tripping
8.1.1 Measurement with Positive Half-Waves
(only MTECH+/MXTRA/SECULIFE IP)
Measurement by means of half-waves plus direct current makes it
possible to measure loop impedance in systems which are
equipped with RCCBs.
For DC measurement with half-waves you can choose between
two alternatives:
DC-L: lower premagnetization current allowing for faster mea-
surement
DC-H: higher premagnetization current, therefore higher protec-
tion against tripping of RCD
Select Measuring Function
Set Parameters
* Parameters used for report generation only which do not influence the measurement
Sine (full wave) Setting for electric circuits without RCD
15 mA sinusoidal Setting only for motor protection switch
with low nominal current
DC+half-wave Setting for electric circuits with RCD
Start Measurement
Semiautomatic
Measurement
8.2 Evaluation of Measured Values
The maximum allowable
loop impedance Z
L-PE
which may be displayed
after allowance has
been made for maxi-
mum operating mea-
surement error (under
normal measuring con-
ditions) can be deter-
mined with the help of
Table 1 on page 88.
Intermediate values can
be interpolated.
The maximum allowable
nominal current for the
protective device (fuse
or circuit breaker) for a line voltage of 230 V after allowance has
been made for maximum measuring error can be determined with
the help of Table 6 on page 89 based upon measured short-cir-
cuit current (corresponds to DIN VDE 0100 Part 600).
Special Case: Suppressing Display of the Limit Value
The limit value cannot be
ascertained. The inspec-
tor is prompted to evalu-
ate the measured val-
ues himself, and to
acknowledge or reject
them with the help of the
softkeys.
Measurement passed:
key 4
Measurement failed:
X key
Z
L-PE
Tripping characteristics:
Diameter*: 1.5 to 70 sq. mm
Cable types*: NY...- H07...
Number of wires*: 2 to 10-strand
Nominal current:
2 ... 160 A, 9999 A
A, B/L, C/G, D, E, H, K, GL/GG & Factor
Sine
15 mA sinusoidal
Waveform:
DC-L offset and positive half-wave
Contact voltage:
DC-H offset and positive half-wave
2-pole
Measurement with country-specific
plug insert (e.g. Schuko)
Note
Selecting test probe and Lx-PE
reference or AUTO is only relevant for
report generation.
Semiautomatic measurement
See also section 5.8 regarding the
AUTO parameter.
Polarity selection
measurement
… 27 …


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