222 WM-OM-E Rev I
the other hand, tells the scope to begin on the third sample, then skip the number of samples
specified by the sparsing factor (4). In this way, the sample rate is effectively reduced.
For the sparsing factor (interval), you can set a value from 1 to 1,000,000 points. For the sparsing
offset you can set a value from 0 to 999,999.
Note: The maximum sparsing offset that can be entered for any sparsing factor equals Sparsing Factor 1.
To Set Up Waveform Sparser
1. In the menu bar, touch Math, then Math setup... in the drop-down menu.
2. Touch the tab for the function (F1 to Fx The number of math traces available depends on
the software options loaded on your scope. See specifications.) you want to assign the
Sparse operation to.
3. Touch inside the Source1 field and select an input waveform.
4. Touch inside the Operator1 field and select Sparse from the Select Math Operator menu.
5. Touch inside the Sparsing factor field and enter a value, using the pop-up keypad.
6. Touch inside the Sparsing offset field and enter a value, using the pop-up keypad.
Interpolation
Linear interpolation, which inserts a straight line between sample points, is best used to reconstruct
straight-edged signals such as square waves. (Sinx)/x interpolation, on the other hand, is suitable
for reconstructing curved or irregular waveshapes, especially when the sampling rate is 3 to 5 times
the system bandwidth. The instrument also gives you a choice of Cubic interpolation.
For each method, you can select a factor from 2 to 50 points by which to interpolate (upsample).
To Set Up Interpolation
1. In the menu bar, touch Math, then Math setup... in the drop-down menu.
2. Touch the tab for the function (F1 to Fx The number of math traces available depends on
the software options loaded on your scope. See Specifications.) you want to assign the
Interpolate operation to.
3. Touch inside the Source1 field and select an input waveform.
4. Touch inside the Operator1 field, then touch the Filter button in the Select Math Operator
menu.
5. Select Interpolate from the Filter submenu.
6. Touch the "Interpolate" tab in the mini setup dialog to the right of the main dialog.
7. Touch inside the Algorithm field and select an interpolation type.
8. Touch inside the Upsample by Upsampling is the factor by which sampling is increased.
field and enter a value, using the pop-up numeric keypad, if you want to enter a specific
value. Otherwise, use the Up/Down buttons to increment the displayed value in a 1-2-5
sequence.
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