Dranetz PowerGuide 4400 User Manual page 168

Compliance Statistical Bar Chart, continued
View Compliance
Statistics bar
chart
(continued)
NOTE
8-10
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Action...
STEP 4: The Interharmonic graph
displays the status of each
individual Interharmonic and TID
for each phase. The bar chart
indicates the percentage of
intervals passing the specified
compliance.
• Press Prev/Next to display
Interharmonic bars from 1st to
25th.
• Press Exit to return to the
Compliance Statistical bar
chart.
Many instruments used for harmonic measurements of power supply systems express
their output with reference to the fundamental component of the voltage, especially
those indicating the THD factor.
Harmonic and Interharmonic values are specified only up to order 25 (EN50160 limit),
for the practical reason that for higher orders, the values are generally so small as to be
impractical to measure. Another reason is because of the difficulty of giving values
which would be relevant to all networks.
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MARK480