Tektronix AWG610, User Manual

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The APPL Window
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AWG610 Arbitrary Waveform Generator User Manual
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
intentionlly)
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 oscilloscope or
other equipments 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 oscilloscope, it is recommended to adjust the edge to zero level.
Use the following steps to modify the waveform.
Creating Isolated Pulse