Fluke 434 User Manual
Page 68
Fluke 433/434
Users Manual
16-2
1
2
3
4
5
A /
L
1
B /
L2
C /
L3
A /
L
1
B /
L2
C /
L3
A /
L
1
B /
L2
C /
L3
DI
P
S
IN
TERRUPTION
S
R
A
PI
D VO
LT
AG
E CH
ANG
E
S
SW
EE
LS
U
N
BA
LA
NCE
FREQ
UENCY
PER PHASE
ALL
PHASES
Figure 16-1. Power Quality Monitor Main Screen
The length of a bar increases if the related parameter is further away from its nominal
value. The bar turns from green to red if an allowed tolerance requirement is violated.
Use the left/right arrow keys to position the cursor on a particular bar and measuring data
belonging to that bar is displayed in the screen header.
Power Quality Monitoring is usually done during a long observation period. The function
is entered via the MONITOR key and a start menu to define immediate or timed start of
the measurement. Minimum duration of the measurement is 2 hours. An usual measuring
period is 1 week.
The Power Quality parameters RMS voltages, Harmonics, and Flicker have a bar for each
phase. From left to right these three bars are related to the phases A (L1), B (L2), and C
(L3).
The parameters Dips/Interruptions/Rapid Voltage Changes/Swells and
Balance/Frequency have a single bar for each parameter representing performance across
three phases.
Most of the Bar Graphs have a wide base indicating adjustable time related limits (for
instance 95 % of time within limit) and a narrow top indicating a fixed 100 % limit. If
one of both limits is violated, the related bar changes from green to red. Dotted horizontal
lines on the display indicate the 100% limit and the adjustable limit.
The meaning of the bar graphs with a wide base and a narrow top is explained below. By
way of example this is done for the RMS voltage. This voltage for instance has a nominal
value of 120 V with a tolerance of + and – 15% (tolerance range between 102 … 138 V).
The momentary RMS voltage is constantly monitored by the Analyzer. It calculates an