User Manual 3153
Using The Instrument 3-11
Figure 3-2, Standard Waveform Selection Panel from WaveCAD
Changing the
Frequency and
Sample Clock
Users should be careful not to confuse waveform frequency with sample
clock frequency. The waveform frequency parameter is valid for
standard waveforms only and controls waveform frequency at the output
connector. On the other hand, the sample clock frequency parameter
is valid for arbitrary waveforms only and defines the frequency at which
the generator clocks data points.
Standard waveform frequency is measured in units of Hertz (Hz).
Arbitrary waveform sample clock frequency is measured in units of
Samples per second (Sa/s). The frequency of a given arbitrary
waveform at the output connector must be computed using the sample
clock frequency and the number of data points. Use the following
equation for computing the frequency of (one cycle of) an arbitrary
waveform:
Frequency = Sample Clock / Number of data points
For example, using a sample clock of 80MSa/s with a 1000-point
waveform will generate an 80kHz waveform at the output connector.
Use the following command to change the frequency for standard
waveforms:
FREQuency {<frequency> | MINimum | MAXimum}
MIN selects the lowest frequency allowed for the currently active
function. MAX selects the highest frequency allowed for the currently
active function. The default frequency setting is 1MHz for all parameters.
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