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Labview 8.5 drivers and values not correct?

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Labview 8.5 drivers and values not correct?

Postby GJR » Tue May 13, 2008 11:06 pm

Hi
We are running Labview 8.5 and runstream.vi and a picoscope 3424. When we input a DC voltage we don't get the correct reading in the labview code but do get the correct one in the picoscope software.

What we set 1.04 V, 2.01 V, 3.07 V
What we read 1.75 V, 3.32 V 5.06 V

Any Ideas what is going on would really help!
Thanks
Peace
GJR
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Postby gruntman » Thu May 29, 2008 9:16 pm

GJR,

The runstream.vi returns the values from the scope in its raw format. Therefore how are you converting the ADC counts to voltage? The proper way would be the following formula:
(raw * (input_ranges[ch])) / (32766)
Therefore if for example the raw output was 16383 and you had the channel setup on ±10V's, the V reading would be 5.00V's.

Regards,

Richard Boyd
Crag Technologies, Inc
http://www.pc-oscilloscopes.com
gruntman
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