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Power Quality Analyzer Model 3945-B
41
5.1.7 Phasor Diagram Display (Fresnal Diagram)
V1
V2
V3
12
23
31
UNBALANCE
V3
V1
V2
RMS
202.8 v
1.5
%
198.7 v
203.2 v
+122 °
+118 °
+120 °
3U
3V
4A
L1
L2
L3
THD CF
max
min
07/25/0259.99Hz 10:26 100
%
4
1
2
3
Figure 5-7
Absolute value of voltage or current, depending on display selection.
Φ 12 corresponds to phase angle between channel 1 and channel 2
Φ 23 corresponds to phase angle between channel 2 and channel 3
Φ 31 corresponds to phase angle between channel 3 and channel 1
NOTE: Thisisvalidforcurrents(4Aand3A)andforsinglevoltage(3V).
Whentheuserchoosestolookataspecicphase(L1,L2orL3)ΦVA is the
phase angle of V in relation to A.
Current or voltage unbalanced ratio.
Phasor diagram displays selection by voltage, current or phase.
NOTE: It is advised to look at the phasor diagram prior to recording to check if the
probes are installed correctly. I1, I2 and I3 should be shown, when installed on a
live circuit, in a clockwise fashion.
The leading (inductive) or lagging (capacitive) effects of the load can be seen at
this time and a snapshot of this screen may be appropriate.