Amprobe DMIII-Multitest Power-Quality-Recorder - Manual (Page 66)

AMPROBE
DMIII MULTITEST
EN-64
8.2. USING THE INSTRUMENT IN A THREE-PHASE 4-WIRE SYSTEM
CAUTION
The maximum voltage between V1, V2, V3, COM inputs is 600 V~ (CATII) /
350V~ phase to earth or 600V~ (CATIII) / 300 V~ phase to earth.
Do not measure voltages exceeding the limits prescribed by this manual.
Should you exceed the voltage limits you could damage the instrument
and/or its components or endanger your own safety.
L1
L2
L3
N
I1
I2
I3
T1 T2 T3 T4
I1 I2 I3
(V1) (V2) (V3) (COM)
Instrument connection in a three phase 4-wire system
1. Check, and if needed modify, the basic settings of the instrument (see paragraphs 7.1
and 7.2). Particularly, the 3PH4W mode must be set.
2. Rotate the switch to the position corresponding to the type of analysis desired.
3. Connect the phase and neutral voltage wires following the connections shown in the
picture above.
4. To measure current and power, connect the clamp meter to the phase conductor
following the specifications shown on the clamp and the connections shown in the
picture above. In case of doubts select the position POWER and, connecting one
clamp a time, check if:
a) the phase sequence is correct (see paragraph 7.4.2).
b)
the active power P of each phase is positive. If it’s negative, remove current transducer
from the wire and reconnect it so the transducer label faces the opposite direction.
c)
the value of the Pf of each phase is not excessively low (typically it’s not lower than
0.4). In case the Pf is lower than 0.4, check if the phase voltage is associated to the
right clamp meter (for example the voltage of phase 1 must be associated to the
clamp meter no. 1).
5. Apply voltage to the electrical equipment under test (if previously shut off for the
instrument connection).
6. The values of the available electrical parameters will be displayed. For further details
see the paragraph relevant to the position of the switch.
7. You can press HOLD to interrupt the real time updating of the displayed values.
8. If you want to record:
a) Check and modify the values of the basic parameters (see paragraphs 7.1 and 7.2).
b) Check and, if needed, modify the recording parameters by pressing MENU (see the
paragraph corresponding to the position of the rotary switch selected).
c) To start the recording press START (see paragraph 10.1).