YOKOGAWA DL7440 User Manual

9-27
IM 701450-01E
9
Waveform Computation
Digital Filter
• The table below shows the selectable filter types, filter frequency bandwidths, and
cutoff frequency types.
Filter Type Frequency Bandwidth Type Cutoff Frequency Setting
Gauss LowPass Set the high cutoff frequency in CutOff1.
Sharp LowPass Set the high cutoff frequency in CutOff1.
BandPass Set the low and high cutoff frequencies in
CutOff1 or CutOff2.
HighPass Set the low cutoff frequency in CutOff1.
IIR LowPass Set the high cutoff frequency in CutOff1.
(Butterworth) BandPass Set the low and high cutoff frequencies in
CutOff1 or CutOff2.
HighPass Set the low cutoff frequency in CutOff1.
* The cutoff frequencies can be set in the range of 2.0% to 30.0% (0.2% steps) of the sample
rate.
• For computation details, see appendix 4.
Constant
Eight constants, K1 to K8, can be defined. You can use the constants in the user-defined
equation. The selectable range is –9.9999E+30 to 9.9999E+30.
Threshold Level for Binary Computation
You can set the threshold level for binary computation when computing BIN and FV to
PWXX in the table of operators given on page 9-24. The operation is the same as for the
binary computation of normal computation. See section 9.3.
Averaging and Peak Computation of Computed Waveforms (Computed Results)
Averaging and peak computation can be performed on the computed data (applies to
both Math1 and Math2). Three types of averaging are available: simple, exponential,
and cycle.
Simple Averaging
The result obtained by simply summing the values for the average count and dividing by
the average count is displayed as a waveform. You can set the following two items.
Item Selections or Selectable Range
Average Domain Time (time domain)
(Domain in which averaging is performed) Freq (frequency domain)
Linear Count 2 to 128, 2
n
steps, where n is a positive integer.
(Average count, the number of acquisitions of the computed waveform to be averaged)
Exponential Averaging
The average is determined by attenuating the effects of past data according to the
specified attenuation constant. The resultant waveform is displayed. You can set the
following two items.
Item Selections or Selectable Range
Average Domain Time (time domain)
(Domain in which averaging is performed) Freq (frequency domain)
Average Weight 2 to 256, 2
n
steps, where n is a positive integer.
(Attenuation constant)
9.9 Performing User-Defined Computation (Optional)

YOKOGAWA DL7440 Specifications

General

Brand	YOKOGAWA
Model	DL7440
Category	Test Equipment
Language	English