MI 3143 Euro Z 440 V
Technical specifications
24
9
Technical specifications
9.1 Impedance [Z]
9.1.1
Z line mΩ, Z loop mΩ
Measuring range according to EN61557-3: 12.0 m
… 19.99
Measurement principle ................................. Voltage / Current measurement (synchronous sampling)
Line Impedance
Loop Impedance
Measuring range (
)
Resolution (m
)
Uncertainty (* See notes)
Z
0.1 m … 199.9 m
0.1
(5 % of r 3 m
)
200 m … 1999 m
1
2.00 … 19.99
10
(5 % of r 3 digits)
Test mode ...................................................... single
Measuring voltage range ............................... 40 V … 470 V
Nominal frequency ........................................ 16 Hz … 420 Hz
Maximum test current .................................. see chapter
9.4 Test Current,
Figure 9.1
Test method .................................................. 4-wire
R and XL values .............................................. yes
Averaging option .......................................... off, 2, 4, 6
Automatic range selection ............................ yes
Automatic test of voltage noise .................... yes
Displayed Prospective Short Circuit Current (I
psc
) is calculated as follows:
𝐼
𝑝𝑠𝑐
=
𝑈
𝑛
× 𝑘
𝑠𝑐
𝑍
If the Nominal Voltage (U
n
) is in the tolerance of ±6 % or ±10 % (parameter setting!) than the prospective
short current (I
psc
) will be calculated. Exceeding the nominal voltage tolerance by ±6 % or ±10 % then I
psc
will not be calculated and the horizontal dashes ( - - - ) will be displayed.
244 V
216 V Un=230 V
253 V
207 V
Un=230 V
±6 %
±10 %
where:
Z ..................................................................... measured Impedance
U
n
................................................................... nominal voltage
k
sc
................................................................... Correction factor (I
sc
factor) for I
psc
Tolerance ....................................................... Nominal voltage system tolerance (±6 % or ±10 %)
Refer to
Appendix B– Short-circuit currents in 3p a.c. systems
for more information.
* Notes:
System voltage and frequency kept constant during measurement!
When measuring at low current amplitudes (test load parameter set to 33.3 %) the result can
vary!
If the measurement triggers a fuse (the voltage drops to zero), the measurement will abort (stop).
Measurement is aborted. Consider displayed warnings and messages.
