aquisition of a voltage Signal with PXI 6713

[FloMAN]

Hi.

I want to make voltage aquisition with a PXI 6713 card. I take the Channels ai16 to ai33. The voltage at the clamp is 3.886VDC ( measured with a DMM ). When i measure the voltage and calculate it into a current ( see my applikation atteched ) the result is something between -10 and -24mA?!?!?

Are the settinges in the DAQmx Express-VI "analog voltage aquire" wrong or could it be another Problem?

My settings are:

RSE

voltage measuring from 0 to +8VDC

N Samples

I hope of yous Answer.

Thanks

[devchander]

Is it a trick question??

First of all, Looks like you mentioned the card wrong PXI 6713 is an AO card, without any AI channels

Which card are you using??

Are you connecting a 390 ohm Resistance on your connector block to convert current signal to Voltage equivalent?? ( Sounds like you are not )

Are you measuring the Voltage correctly in the first place??

if you are not, check if the signal is connected correctly for RSE mode

Hope this Helps

Regards

Dev

Message Edited by devchander on 07-28-2006 07:35 AM

[FloMAN]

Hi.

Sorry, I use the PXI 6225 not the 6713. The 6713 is next to the 6225 in my Chassis so I changed it.

I connect a 390 Ohm resistor to convert the current between 4 and 20 mA into voltage between 1,56 and 7,8 VDC.

In my applikation i calculate this voltage back into a current.

[devchander]

Why not connect input in Differential mode??

Message Edited by devchander on 07-31-2006 05:23 AM