RE: Calibration problems

Mr. Hess,

Is Maz the Northerner correct?  Do I need to use comedi_apply_calibration()?

When and how often do you recommend calibration?

Is there any documentation on this?  I'm pretty sure calibration is never 
mentioned in the Comedi reference document.  There is one document in the 
calibration file under Comedi, but it does not really appear to be intended to 
be instructions.

I have attached the results as you suggested.  Please let me know if you come 
up with a fix for this issue.

Regards,

Heather

>===== Original Message From fmhess_at_users.sourceforge.net =====
>On Wednesday 26 July 2006 11:39 am, hhumphre wrote:
>> I'm not sure I'm calibrating correctly.  I'm not running the calibration
>> in my startup scripts.  I'm doing it manually in the terminal.  I am
>> just doing the following:
>>
>> [root_at_odex comedi_calibrate]# ./comedi_calibrate
>> eeprom reference lsb=130 msb=253
>> resulting reference voltage: 4.99936
>> Id: comedi_calibrate.c,v 1.92 2004/03/29 01:34:15 fmhess Exp
>> Driver name: ni_pcimio
>> Device name: pci-6036e
>> Id: ni.c,v 1.130 2004/09/09 21:43:16 fmhess Exp
>> Comedi version: 0.7.70
>> Applied calibration for subdevice 0, channel 0, range 0, aref 0
>>
>> I've read that the NI-6036E board that I'm using generates an internal
>> voltage of 5 Volts for calibration.  So the resulting reference voltage
>> looks good.
>
>You know, it's not actually doing a new calibration.  It's just reading
>values from a file produced by an old calibration (probably one that
>failed pretty badly) and applying them.  You might try running
>comedi_calibrate with the options "--calibrate --results --verbose" and
>sending me the output.
>
>--
>Frank
>
>
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