DAQ Mis read signal

[Pradeepvimal]

Hi I am using PXI 6220 DAQ device I am able to read voltage from 0 to 15 volts when exceeding 15 volts DAQ reads the signal wrongly 

Regards

Pradeep

[Dennis_Knutson]

Since the max input voltage is 10V as you should certainly know, what would expect?

[crossrulz]

I'm surprised it worked up to 15V.  The spec states that any input greater than 11V (relative to ground) will damage the board.  Or do you have a buffer circuit to divide down the voltage?

[Pradeepvimal]

I am Using voltage Divider 1k and 9k so i am dividing by 10 so i can read voltage upto 100 volts when it reads 15 volts my DAQ reads 1.5 volts when it exceeds 15 volts my DAQ reads different values other than the respective values

[crossrulz]

Are you applying a scale in DAQmx?  What range are you using?

[Pradeepvimal]

I am using -10to 10 since my voltage sense is differential  i am using I am able to sense upto 15 volts by using a voltage divider which divides by 10 when exceeding 15 volts  i have problem

[johnsold]

Can you measure the voltage at the input terminal of the DAQ device (after the divider) using a voltmeter? This would provide an independent check that you have not mis-wired the divider or that the divider ratio is not what you expected.

Lynn

[Pradeepvimal]

Yes I checked it its perfect but in my DAQ its reading the value in a wrong way.

Regards

Pradeep