MI 3155
Eurotest
XD
Test and measurements
172
Connection diagram
Figure 7.107: AUTO TT measurement
Measurement procedure
Enter the
AUTO TT
function.
Set test parameters / limits.
Measure the impedance Zref at origin (optional), see chapter
Connect test cable to the instrument.
Connect 3-wire test lead or Plug commander to the object under test, see
Start the Auto test.
Save results (optional).
Figure 7.108: Examples of AUTO TT measurement results
Measurement results / sub-results
Uln
Voltage between phase and neutral conductors
∆
U
Voltage drop
Z (LN)
Line impedance
Z (LPE)
Loop impedance
Uc
Contact voltage
Zref
Reference line impedance
Ipsc (LN)
Prospective short-circuit current
Ipsc (LPE)
Prospective fault current