METREL EasiPLUS MI 3000 - Page 68

MI 3000 EasiPLUS IT supply systems
68
C.4.5 Line resistance and prospective short-circuit current
Line resistance
Measuring range according to EN61557-3 is 0.25   1999 .
Measuring range () Resolution ()
Accuracy
*)
0.00  19.99
0.01
20.0  99.9
0.1
100  1999
1
(5 % of reading + 5 digits)
*)
The accuracy is valid if mains voltage is stable during the measurement.
Prospective short-circuit current (calculated value)
Measuring range (A) Resolution (A) Accuracy
0.00  19.99
0.01
20.0  99.9
0.1
100  999
1
1.00k  9.99k
10
10.0  24.4k
100
Consider accuracy of line
resistance measurement
IPFC calculation................................ I
PSC
=U
N
 k
SC
/ Z
L-N
U
N
= 110 V, (90 V  U  121 V)
Test current ...................................... 3.1 A (10 ms)
Nominal input voltage ....................... 110 V (45 Hz  6