Capture
Once you initialize the analyzer, you can begin capturing data for
analysis. Remember that while the analyzer is responding to
commands from the controller, it is not performing acquisitions. Also,
when you change the analyzer configuration, any data already
captured is most likely invalid.
To collect data, you use the :DIGitize command. This command clears
the waveform buffers and starts the acquisition process. Acquisition
continues until acquisition memory is full, then stops. The acquired
data is displayed by the analyzer, and the captured data can be
measured, stored in trace memory in the analyzer, or transferred to
the controller for further analysis. Any additional commands sent
while :DIGitize is working are buffered until :DIGitize is complete.
You could also start the analyzer running, then use a wait loop in your
program to ensure that the analyzer has completed at least one
acquisition before you make a measurement. HP does not recommend
this because the needed length of the wait loop may vary, causing
your program to fail. :DIGitize, on the other hand, ensures that data
capture is complete. Also, :DIGitize, when complete, stops the
acquisition process so that all measurements are on displayed data,
not on a constantly changing data set.
Analyze
After the analyzer has completed an acquisition, you can find out
more about the data, either by using the analyzer measurements or by
transferring the data to the controller for manipulation by your
program. Built-in measurements include frequency, duty cycle,
period, positive and negative pulse width, channel-to-channel delay,
and setup and hold time.
Using the :WAVeform commands, you can transfer the data to your
controller. You may want to display the data, compare it to a known
good measurement, or simply check logic patterns at various time
intervals in the acquisition.
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