Fluke 434-II User Manual page 80

Fluke 434-II/435-II/437-II
Users Manual
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. 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
Unbalance/Frequency have a single bar for each parameter representing performance
across three phases.
For Mains Signaling there is a single bar in the Main screen representing performance
across three phases and for frequency 1 and 2. Separate bars per phase and for frequency
1 and 2 are available in the submenu under Function key F5.
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).
16-2
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Figure 16-1. Power Quality Monitor Main Screen
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