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List:       comedi
Subject:    Re: how to create a timer controlled analog-in command
From:       Caleb Tennis <caleb () aei-tech ! com>
Date:       2006-06-16 10:30:09
Message-ID: E285422E-ECDA-40FE-8F25-18DEBAD6C490 () aei-tech ! com
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>
> Once I tried running comedi_calibrate with channels 1-5 directly  
> shorted out
> to ground, separated from my circuit.  Then I connected my circuit  
> to channels
> 1-5.  I measured the voltage at the board with a voltmeter, where  
> the circuit
> output is connected to the DAQ.  Then I ran inpn.c.  Here's my  
> results:

Make sure you have your signal ground connect to AIGND on the NI  
terminal strip.  Also make sure you're running inpn with AREF_GROUND  
and not AREF_DIFF or something else.  It's an option you can pass  
to ./inpn, something like ./inpn -a 0 I believe.

Caleb

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