User's Manual

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3-136 AWG710&AWG710B Arbitrary Waveform Generator User Manual
Creating Isolated Pulse
Two parameters are important to create an isolated pulse.
 Number of points for 1 bit
Samples/Cell parameter is displayed on the Disk application screen. This
represents the number of points for one bit of disk waveform. Isolated pulse
must correspond to this parameter value.
 Total points of the isolated pulse
Total number of points that make up the isolated waveform should be set to
four times of values given by Samples/Cell parameter. The maximum number
of points is smaller than the value calculated by the two parameters: data points
specified by Write Data(bottom) Pre-defined Pattern... or Read From File...
and the value specified by Samples/Cell parameter. In other words, the
maximum number of points is smaller than the number of points after the
application performs superposition.
Using formula.
Use the following formula to specify the values when the waveform is acquired
from calculation.
Peak value: Center (Except for shifting the value
intentionally)
PW50: (Samples/cell)/2
Waveform size: (Samples/cell)*4
For example, you use Lorentz waveform, specify the formula as follows;
cells = 10 ’Samples/cell ==> 10
size = cells * 4 ’Number of total waveform points
pw = cells / 2 ’Pulse width at half level
clock = 1e9 ’AWG clock that needs to calculate
ppw = pw / clock ’Pulse width for calc.
pposit = size / 2 / clock ’Peak position for calc.
”Lorentz.wfm” = 1/(1+(2*(time - pposit)/ppw)^2)
Using acquired waveform file.
You can create isolated waveform from signals acquired through the oscilloscope
or other equipment by using the waveform editor.
When acquiring the signals, it is not necessary to observe the number of points or
PW50. However, it is required to set the pulse edge to 0 (zero). When you use the
waveforms from the oscilloscope, it is recommended to adjust the edge to zero
level.