May 11, 2004

Acquisition update

The source-acquisition system seems to be working properly now. Sometimes the response from :FORM:ELEMents? is slow, so it is important to make sure that GPIB Read does not timeout, which was what was happening. Unfortunately, labview is less than helpful in these instances, providing only a "generic file I/O error". Also, uploading the waveform is slow, since I do it in blocks of 25, communicating with GPIB each time. This can be optimized substantially, though will not affect actually acquisition. The best I was able to achieve was about 1.9 ms. Only two things really make this worse, voltage autoranging (in the case of a current source) and auto-zero. Voltage autoranging makes the timing very erratic, on average it is about 2.7 ms, but can go up as much as 26 ms when the machine is thinking. Auto-zero is not so bad in terms of stability but will add a little more than 2.5 ms to the measurement.

To summarize:

scenarioδt (ms)
all off, just volts, SREal1.857
all off, all functions,SREal1.901
all off, all functions, ASCII1.901
auto filter on (1/5%), rest off, all functions, SREal1.901
repeat filter on (1), rest off, all functions, SREal1.901
median filter on (0) rest off, all functions, SREal1.901
current autoranging on, rest off, all functions, SREal1.901
voltage autoranging on, rest off, all functions, SREal2.724
autozero on, rest off, all functions, SREal4.422

You can pick up the raw data here.

Posted by torque at May 11, 2004 3:02 PM | TrackBack
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