17-11
IM DLM3054-01EN
List Display (List)
You can display a list of the computed values and the standard limits of each harmonic up to the 40th harmonic.
The contents of the list vary according to the class.
• When the class is A, B, or D
The list contains harmonic orders, their values and limits in amps, and information.
• When the class is C
The list contains harmonic orders, their values in amps, their limits (the standard limit ratio × the fundamental
current value in amps), their values as percentages (computed harmonic value in amps ÷ fundamental current
value in amps), their limits as percentages (ratio of the harmonic to the fundamental current), and information.
The list also displays total harmonic distortion as percentages and rms values in amps. k denotes a harmonic
order.
• RMS value (RMS) [A]
• Total harmonic distortion (THD) [%]
k = 2
40
I(k)
2
I(1)
k = 1
40
I(k)
2
List Size (List Size)
Select the list size and display position from one of the settings below.
Full Screen: Displays the list in full-screen mode
Half(Upper): Displays the list in the top half of the screen
Half(Lower): Displays the list in the bottom half of the screen
Saving the List (Save List)
You can save the data of the analysis results of each harmonic and standard limits in CSV format to a storage
device. The extension is .csv.
Analysis Number (List No.)
The line corresponding to the number you select is highlighted.
• The instrument can perform harmonic analysis on single-phase devices but not on three-phase devices.
• IEC 61000-4-7 specifies that the measured data be smoothed using a first-order filter for 1.5 seconds, but
the harmonics analysis results on the instrument are instantaneous values. Therefore, the results do not
fully comply with the standard. To take make proper measurements in accordance with the standard, you
need to use a YOKOGAWA WT3000 series digital power meter and its harmonic measurement software
(761921).
• You can save the analysis results and the standard limits of each harmonic component to a CSV file. You
cannot save the harmonic waveform data.
• You can save the original waveform data that you used for harmonic analysis. If you save the waveform
data, you can load it onto an instrument with the power supply analysis feature (/G03 option) and perform
harmonic analysis.
• You cannot perform harmonic analysis if 10 periods (for 45 Hz to 55 Hz) or 12 periods (for 55 Hz to 65 Hz)
of a waveform correspond to less than 200 ms or if the number of data points is less than 9000 points. If
this occurs, “--------” appears in the Measure (A) and Measure (%) columns in the list. “--------” also appears
for harmonic limits (Limit(A)) that are not specified for a particular class.
17 Power Supply Analysis Feature (Power Analysis and Power Measurement, Option)