MI 3108 EurotestPV
Measurements
– a.c. LV installations
63
110 V
(93 V
U
L-N
134 V)
230 V
(185 V
U
L-N
266 V)
400 V
(321 V
U
L-L
485 V)
Note:
High fluctuations of mains voltage can influence the measurement results (the
noise sign
is displayed in the message field). In this case it is recommended to
repeat few measurements to check if the readings are stable.
5.8.2 Voltage drop
The voltage drop is calculated based on the difference of line impedance at connection
points (sockets) and the line impedance at the reference point (usually the impedance at
the switchboard).
Circuits for measurement of voltage drop
Figure 5.35: Phase-neutral or phase-phase voltage drop measurement
– connection of
plug cable and 3-wire test lead
Voltage drop measurement procedure
Step 1: Measuring the impedance Zref at origin
Select the
ΔU
sub-function using the function selector keys and
/
keys.
Select test
parameters
(optional).
Connect
test cable to the instrument.
Connect
the test leads to the origin of electrical installation (see
figure 5.35
).
Press the
CAL
key to perform the measurement.
Step 2: Measuring the voltage drop
Select the
ΔU
sub-function using the function selector keys and
/
keys.
Select test
parameters
(Fuse type must be selected).
Connect
test cable or plug commander to the instrument.
Connect
the test leads to the tested points (see
figure 5.29
).
Press the
TEST
key to perform the measurement.
Store
the result by pressing the MEM key (optional).
