SDA Operator’s Manual
Here is the VBScript that produced the "golden sine" (F2 previous):
Frequency = 3000000.0 ' Frequency of real data
SampleTime = InResult.HorizontalPerStep
Omega = 2.0 * 3.1416 * Frequency * SampleTime
Amplitude = 0.15 ' Amplitude of real data
For K = 0 To LastPoint
newDataArray(K) = Amplitude * Sin(Omega * K)
Next
OutResult.DataArray(True) = newDataArray ' Data in volts
OutResult.DataArray is the waveform returned to the scope and displayed on the scope as the F2
waveform.
Example 4
Example 4 is a measurement of DVI (Digital Video Interface) Data-Clock skew jitter
measurement, using a VBScript to emulate the PLL.
In this example, a customer was not able to probe the desired clock signal. The only probing point
available was the output differential clock signal (C2). However, that clock was a factor of 10
slower than the clock embedded in the data signal (C3). By using a VBScript to create a clock
waveform of the appropriate frequency (waveform F1), the customer was able to display and
measure data-clock skew using a LeCroy instrument function and parameter.
SDA-OM-E Rev H 221
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