17-8
IM 253710-01E
Vector/Bar Graph Displays
Item
Specification
Vector display
Applicable during the harmonic measurement mode. Displays vectors of the phase difference of the
fundamental signals.
Bar graph display
Applicable during the harmonic measurement mode. Displays the bar graph of the amplitude of
each harmonic.
Simultaneous display
Displays a combination of two displays from numerical, waveform, and bar graph, in the top and bottom halves of the divided
screen.
Numerical computation
Item
Specification
Measurement/computation Set the period over which the measurement function or numerical computation is performed.
period
Select the method from zero crossing, cursor, and external trigger and set period for each.
However, cursor can only be used during the harmonic measurement mode. For the specifications
on the external trigger input, see section 17.6, “External Trigger I/O Section.”
Delta computation
Applicable only during the normal measurement mode. Compute other numerical data of the
measured circuit from the computed results of the difference of the instantaneous values.
User-defined function
Compute numerical data of equations (up to four equations) that are created by combining the
measurement function symbols and operators.
Equation for the apparent
Applicable only during the normal measurement mode. Select the equation from Urms
×
Irms,
power
Umn
×
Imn, and Udc
×
Idc.
Averaging
Exponential averaging. Select the attenuation constant from 2, 4, 8, 16, 32, and 64.
Phase difference display
Select whether to display using lead and lag format or 360
°
format.
Equation for the distortion
Set the denominator of the equation to the total waveform or fundamental waveform.
factor
Corrected Power
Correction of active power as defined by the applicable standard IEC76-1(1976), IEEE C57.12.90-
1993, and IEC76-1(1993).
Re-computing of numerical The measurement/computation region can be reset and the measurement function and equation
data
can be recomputed (except for averaging).
Waveform Analysis
Item
Specification
Waveform computation
Set the region for waveform computation using the cursor. Set up to 100 k-words.
region
Waveform computation
Computes the waveforms of equations (up to two equations) that are created by combining the
waveform symbols and operators.
Display scaling
Set and display the upper and lower limits of the computed waveform. Auto configuration is
possible.
FFT
Determines and displays the power spectrum using fast Fourier Transform. Select the number of
computation points from 1000, 2000, and 10000.
Cursor measurement
Place markers, horizontal and vertical cursors on the waveform and measure the values at those
points.
The accuracy of one sampled data point is
±
2% of range (designed value) and does not include
sampling resolution and analog bandwidth errors.
Re-computing the
Reset the computation region and re-compute the waveform and FFT.
waveform / FFT
17.5 Functions