YOKOGAWA WT500 User Manual page 177

IM 760201-01E
Note
• For information about measurement function symbol meanings, see section 2.2, "Types of
Harmonic Measurement Functions."
• "-------" or space is displayed if a measurement function is not selected or if there is no
numeric data.
• The measured harmonic minimum value determined in section 6.5 (MinOrder) and the
maximum harmonic order value determined automatically based on the PLL source
frequency (see section 6.9 for details) determine the range of harmonics from which numeric
data is determined. No numeric data is displayed for harmonic orders outside of this range.
• Harmonic orders to Total or from dc (0th) to the 50
only the data of harmonics up to the maximum harmonic order value determined
automatically based on the PLL source frequency (see section 14.6 for details) is measured.
• If the analysis window width (number of cycles of the fundamental signal) that is determined
by the fundamental frequency is shorter than the data update interval, harmonic data is not
measured, and "-------" (no data) is displayed. If this happens, decrease the data update
rate. For example, if the fundamental frequency is 10 Hz (100-ms cycle), the analysis
window width is 1 wave (see section 14.6 for details), and the data measurement interval
is 100 ms. In this case, the time required for harmonic measurement is approximately 150
ms or greater (data measurement interval + data processing time). To measure and display
harmonic data, set the data update rate to a value greater than or equal to 200 ms.
• Overload ("-OL-") and zero are not displayed for harmonic orders from dc (0
to 50. For information about the display of zero and the overload indication in normal
measurement, see section 5.2.
• If the power factor λ is greater than 1 and less than or equal to 2,
zero.
λ λ
• If is greater than 2, and
6.2 Changing Numeric Data Display Items
th harmonic can be displayed. However,
f
return errors ("Error" is displayed).
th
order)
λ returns 1. f returns
Index
6-7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
App