34
Power Quality Analyzer Model 3945
The measurement type is selected using one of the six variable function but-
tons. All of these measurements are valid in 3U, 3V, 3A, L1, L2 and L3.
The waveforms are selected by pressing the
buttons:
-
3U
displays the three phase-phase voltages of a three-phase system
-
3V
displays the three voltages of a three-phase system
-
3A
displays the three phase currents of a three phase-3 wire system
The neutral current is not a direct measurement
, but the resulting total
of the 3 currents measured.
- L1, L2
or
L3
displays the current and voltage, on phase one, two or three,
respectively.
IMPORTANT NOTE:
The choice of waveforms to be displayed, in any display
mode, depends on the type of connection (see § 4.1.5).
• Single-phase: No choice (L1)
• Three phase-3 wire: 3U, 3V, 3A, L1, L2, L3
• Two-phase: 2V, 3A, L1, L2
• Three phase-4 wire: 3U, 3V, 4A, L1, L2, L3
5.1.2 RMS Voltage Measurement on 3 Phases
300V
RMS
0
- 300
<t= 5.0ms V1= +2783
V2= -144
V3= -147
>
207.6 v
204.4 v
204.9 v
1
2
3
3U
3V
3A
L1
L2
L3
THD
CF
max
min
07/25/02
59.99Hz
10:26
100%
Figure 5-2
