5
IM 701450-61E
Waveform Computation on Power Analysis Parameters
As with the standard waveform computation, waveform computation such as
Instantaneous power, impedance, Joule integral, power spectrum, and harmonics can be
performed on the displayed waveform (within the display record length), and the
computed results can be displayed using waveforms (computed waveforms).
In harmonics computation, the harmonics generated by the equipment under test
2
as
defined by the IEC Standard
1
can be computed for each applicable class (A through D).
Bar graphs and lists can be displayed for making comparisons between the limits of the
harmonic current and the measured values. The computed results (computed values)
obtained through this function do not accurately comply with the standard. To make
accurate measurements complying with the standard, the WT2000 Series Digital Power
Meter and Harmonic Analysis Software (Model 761922) are required.
1 IEC 61000-3-2 (Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic
current emissions (equipment input current
≤
16 A per phase)) Edition 2:2000 consolidated
with amendment 1:2001, abbreviated as IEC 61000-3-2 Edition 2.1, and EN61000-3-2
Amendment 14.
2 Electrical and electronic equipment having an input current of up to 16 A per phase and
connected to public low-voltage distribution systems. The figure below shows the description
of the applicable equipment. However, the DL7400 can only compute the harmonics of
single-phase equipment. It cannot compute the harmonics of three-phase equipment.
Electrical and electronic equipment having an input current up to 16 A per phase
Class A
Class B
Television receivers, personal computers
(PCs), and PC monitors with a rated power
of 600 W or less
Class D
Class C
Portable tools
Lighting equipment
• Balanced three-phase equipment
• Household appliances, excluding
equipment identified as Class D
• Tools excluding portable tools
(portable tools are Class B)
• Dimmers for incandescent lamps
• Audio
equipment
• Equipment not specified in one of
the other three classes (B, C, and D)
Trend Display of Measured Values of Waveform Parameters per Cycle
Using a procedure similar to the measurement and statistical processing per cycle (see section
10.7 in the
DL7440/DL7480 User’s Manual
), the measured values of waveform parameters per
cycle can be determined on the displayed waveform (within the display record length), and the
change over time in the measured values can be shown on the trend display.
History Search Using Measured Values of Power Analysis Parameters (Waveform
Parameter Search)
As with the standard measurement parameters, you can perform history search using
power analysis parameters. For details on the function and procedural explanations, see
section 10.3 in the
DL7440/DL7480 User’s Manual
.
GO/NO-GO Determination Using Measured Values of Power Analysis Parameters
As with the standard measurement parameters, you can perform GO/NO-GO
determination using power analysis parameters. For details on the function and
procedural explanations, see section 10.10 in the
DL7440/DL7480 User’s Manual
.
Display of the Area of Voltage-Current Operation (X-Y Display)
By assigning the voltage input channel and current input channel to the X-axis and Y-
axis, respectively, and displaying the X-Y waveform on the DL7400, the area of voltage-
current operation of the equipment under test can be displayed. You can check whether
this area is within the area of safe operation (ASO). For instructions on displaying the X-
Y waveform, see section 8.5 in the
DL7440/DL7480 User’s Manual
. This manual does
not explain the procedure.
1 Overview of the Power Analysis Function
