YOKOGAWA DL7440 User Manual

9-5
IM 701450-01E
9
Waveform Computation
Note
If the scaling method is switched from manual to auto, the center and sensitivity values that
you specified when in manual mode are set to auto scaled values.
Unit of Computed Waveforms
Units can be assigned to computed waveforms Math1 and Math2 using up to 4
characters.
• The type of characters that can be used are those displayed on the keyboard.
• The specified unit is displayed along with the scaled value (section 8.8).
Smoothing
Smoothing refers to the operation of deriving the weighted moving average every five
points of the waveform to be computed. Since the process is performed on the
waveform data stored in the acquisition memory, it can be performed even when
acquisition is stopped. Smoothing has the frequency characteristics shown in the
following diagram with respect to the sample rate. The –3 dB point is at approximately
13% of the sample rate.
f0.5f0.13f
Frequency
0dB
–3dB
Attenuation
f: Sampling frequency
• You can select whether to perform computation using the smoothed waveform data
for computed waveforms Math1 and Math2, separately.
ON
Perform computation using the smoothed waveform data.
OFF
Perform computation using the waveform data that is not smoothed.
• The smoothing setting applies to all computations of addition, subtraction,
multiplication, binary computation, waveform inversion, differentiation, and integration.
If the smoothing setting is changed on one of the computation settings, the change
takes effect on all other computations (addition, subtraction, multiplication, binary
computation, waveform inversion, differentiation, and integration). However, Math1
and Math2 can be set separately.
Effects of Linear Scaling
If linear scaling is performed on the channel to be computed, computation is performed
using linearly scaled values.
Maximum Record Length That Can Be Computed
The maximum record lengths that can be computed on Math1 and Math2 are as follows:
• On 4 MW memory models (701450 and 701470), the maximum record length is 4 MW.
• On 16 MW memory models (701460 and 701480), the record length is 8 MW and 4
MW when interleave mode is ON and when interleave mode is OFF, respectively.
Computed Waveform Labels
Labels can be assigned to computed waveforms Math1 and Math2 using up to 8
characters. For details, see section 9.1.
9.2 Adding, Subtracting, and Multiplying Waveforms

YOKOGAWA DL7440 Specifications

General

Brand	YOKOGAWA
Model	DL7440
Category	Test Equipment
Language	English