METREL MI 3125 - Voltage Measurement Results and Interpretation

MI 3125 InstaltestCOMBO Voltage, frequency, phase sequence
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Voltage measurement procedure
 Select the VOLTAGE TRMS function using the function selector switch.
 Connect test cable to the instrument.
 Connect test leads to the item to be tested (see figures 5.6 and 5.7).
Measurement runs immediately after selection of VOLTAGE TRMS function.
Figure 5.8: Examples of voltage measurement in three-phase system
Displayed results for single phase system:
Uln...........Voltage between phase and neutral conductors,
Ulpe.........Voltage between phase and protective conductors,
Unpe........Voltage between neutral and protective conductors,
f ...............frequency.
Displayed results for three-phase system:
U12..........Voltage between phases L1 and L2,
U13..........Voltage between phases L1 and L3,
U23..........Voltage between phases L2 and L3,
1.2.3 ........Correct connection – CW rotation sequence,
3.2.1 ........Invalid connection – CCW rotation sequence,
f ...............frequency.