MI 3125 InstaltestCOMBO
Voltage, frequency, phase sequence
27
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.
