Publication No. 980935 Rev. A
3152B User Manual
waveform shapes:
func:shap sin
Selects the sine waveform
func:shap tri
Selects the triangle waveform
func:shap squ
Selects the square waveform
func:shap puls
Selects the pulse waveform
func:shap ramp
Selects the ramp waveform
func:shap sinc
Selects the sinc waveform
func:shap gaus
Selects the Gaussian waveform
func:shap exp
Selects the exponential waveform
func:shap nois
Selects the noise waveform
func:shap dc
Selects the DC waveform
After you select a waveform shape, you may specify the waveform
parameters. Chapter
5 explains the commands available for
specifying parameters of standard waveforms.
Note
The number of points used for defining a standard
waveform depends upon the programmed frequency.
Therefore, some parameter changes may not have any
effect on the waveform because the number of points do
not provide enough resolution to show the difference.
The number of waveform points varies, depending upon the output
frequency. The reason for this variation is that even standard
waveforms are in a manner similar to that of arbitrary waveforms,
except that the 3152B stores standard waveforms in a permanent
internal library for immediate use. At low frequencies, the number of
points for each standard waveform is 1,000. Therefore, waveform
modifications are possible in increments of 1/1,000 of the total
waveform. For example, if you want to modify the duty cycle of a
square waveform, the resolution for the duty cycle is 0.1%.
At higher frequencies, the number of points used for generating
waveforms decreases according to the following relationship:
Output Frequency = Sample Clock Frequency / Waveform Points
Since the maximum sample clock frequency is 250 MS/s, the only
way to increase frequency is by reducing the number of waveform
points (when the standard waveform frequency is > 250 kHz). The
reduced number of points available at higher frequencies decreases
timing resolution for the standard waveforms. For example, for a
25 MHz square wave, only ten points per period are available.
Therefore, duty cycle resolution is decreased to 10% increments.
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