GW Instek APS-1102 Control Software User Manual - Manual (Page 76)

7 Arbitrary Waveform Editing
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Formula waveform
As an example of editing an arbitrary waveform by formula, we will create a waveform of a
fundamental wave with the 3rd and 5th harmonics waves superimposed.
Step 1: Select [Set] - [System Setting].
A dialog titled [Unit Setting] appears.
Step 2: In the [Unit (X)] combo box of [X-axis Unit Setting], click [User]. Leave Min-Max as the
initial value of [0.000000 to 1.000000].
Step 3: In the [Unit (Y)] combo box of [Y-axis Unit Setting], click [User]. Leave Min-Max as the
initial value of [0.000000 to 1.000000].
Step 4: Click OK button to return to waveform display screen.
Step 5: Click Create button on Select Item Panel.
You can also click [Tool] - [Create] to obtain the same result.
Select Item Panel is changed to [New Arbitrary Waveform Editing Panel].
Step 6: Click button on the right side of [Wave], and then click [Function] in the displayed list.
Step 7: Enter "s=2*pi;" in the input area on the right side of [Constant].
Enter "sin(x*s)+sin(x*s*3)/3+sin(x*s*5)/5" in the input area on the right side of [Y=].
Step 8: Clicking Execute button displays a waveform as a calculation result in the Arbitrary
waveform editing screen.
Step 9: Click All-Page OK button to return to waveform display section.
Description 1: Here, entire horizontal axis (X) is processed as the range of 0 to 1 by using the
user-defined unit. Also, entire vertical axis (Y) is processed as the range of ±1.
One cycle of a sine wave is easily expressed by defining s=2

as a constant and specifying
[x*s] in the formula.
Description 2: In step 2, if the range of X is set as 0 to 6.283185 (2

) using the user-defined unit, the
formula becomes more simple as [sin(x)+sin(x*3)/3+sin(x*5)/5].