Gw-instek APS-1102 Control Software User Manual Instrukcja Użytkownika Pobierz pdf (Strona 47)

6.5 Numerical Expression Waveform

6-5

6.5 Numerical Expression Waveform

This section explains how to create a waveform by superposing 3rd and 5th harmonics over the

fundamental wave, as a sample of generating a waveform with a numerical expression.

Step 1: Select [Setup] - [Setup].

The screen titled [ARB - System Settings] appears.

Step 2: Click the [Unit Setup] page tab.

Step 3: Click the

button to the right of [X-Axis Unit] and click [User Unit] from the

displayed list.

Leave the minimum value to the maximum value two lines below as their initial

values, [0.000000 - 1.000000].

Step 4: Click the

button to the right of [Y-Axis Unit] and click [User Unit] from the

displayed list.

Leave the minimum value to the maximum value in the last line as their initial

values, [-1.000 - 1.000].

Step 5: Click the

OK button to return to the waveform display screen.

Step 6: Click the button at the left top of the screen.

Step 7: Click the

button to the right of [Function] and click [Expression] from the

displayed list.

Step 8: Input [s=2*pi;] in the input area to the right of [Constant]

Input [sin(x*s)+sin(x*s*3)/3+sin(x*s*5)/5] in the input area to the right of [Y

=].

Step 9: Click the

Compute button. The calculated waveform is displayed on the waveform

generation screen.

Step 10: Click the All Page OK button to return to the waveform display screen.

Explanation 1: In this example, the horizontal line (X) is treated as 0 to 1 by using the user unit.

Likewise, the vertical line (Y) is treated as ±1 as a whole.

The expression of one cycle of the sine wave is made easier by defining s=2 as a

constant so that [x*s] is expressed in a formula.

Explanation 2: If you set the X range for the user unit to 0 to 6.283185 (2) at step 3, the expression

becomes simpler: [sin(x)+sin(x*3)/3+sin(x*5)/5].

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Gw-instek APS-1102 Control Software User Manual Instrukcja Użytkownika Strona 47