Fluke 1736 User Manual page 48

1736/1738
Users Manual
The screen updates with each new average calculation
interval of 10 minutes. From the PQ Health Home screen
you have access to:
•
PQ Graphs
•
Harmonics
•
Events
Quality Overview
The Quality Overview screen shows an average of voltage
THD and the first 25 voltage harmonics of up to three
phases and the number of voltage events. The screen
updates with each new average calculation interval of
10 minutes.
From the PQ Health home screen you have access to:
•
PQ Graphs
•
Harmonics
•
Events
PQ Graphs
Use  (PQ Graphs) to review the graphs of the power
quality parameters: Voltage, Frequency, and Supply
Voltage Unbalance. The Voltage and Unbalance values
are averaged every 10 minutes and the interval begins
with the 10-minute clock tick. The time stamp of the
interval represents the end of the interval. The Frequency
is averaged over an interval of 10 seconds. New values
are available every 10 minutes.
The Unbalance value u2 (negative sequence ratio) is the
ratio of negative sequence divided by positive sequence
and is shown as a percentage.
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In the case of a counter-clockwise rotating system, the
unbalance would show values exceeding 100 %. In this
case the ratio positive sequence divided by negative
system is calculated which results in values lower or equal
to 100 %.
The unbalance is only available in three phase
delta and wye systems, excluding the balanced
systems.
Harmonics
Use  (Harmonics) to access the harmonics analysis
screens for voltage and current.
Harmonics Spectrum
The harmonics spectrum is a bar chart of the harmonics
h02 ... h50. When % of the fundamental is selected, THD
is included in the chart. The bar chart in absolute units (V
RMS, A RMS) includes the fundamental. Use the trend
chart to show the exact value.
Trend Chart
The trend chart is a chart of the fundamental, a selectable
harmonic, or THD. A split screen shows the harmonics
spectrum in the upper graph and the trend chart in the
lower graph. Touch the bar chart or use  and 
to select the parameter of interest. Press  (Trend
only) to expand the trend chart to full screen.
Harmonics Spectrum Relative to Harmonic Limits
This screen is available on 1738 or 1736 with
1736/Upgrade or IEEE 519/Report license) and shows the
Note