How do I measure increase the input analog voltage limitation of the DAQmx

[luckyluke]

I have a PCI 6064E card that is said to be able to measure input analog signals up to 35 Volts (table 4-3 of the User Manual). However, there is a +/- 10 Volts limitation in the DAQmx driver. Because of this limitation, I cannot measure the an input voltage of 24V.

Is it possible to increase the voltage limitation of the DAQmx?

Thanks for your help

[AnalogKid2DigitalMan]

Are you sure it is a 6064? I could not find a manual or a product with that number.

Could it be the 35V you mentioned is actually a maximum input specification?

[luckyluke]

Hi!

Sorry! The card is PCI 6024E. The maximal voltage of 35 Volt actually refers to the "Protection" voltage of the card, above which "National Instrument is not liable for any damage resulting" from a signal above 35V [p4-20 of User Manual, see attached document

Is it risky to measure a potential of 24V with such device?

Thanks.

[AnalogKid2DigitalMan]

The maximum range the card can read on the inputs is +/-10V. Anything larger than that and it will probably read 10V.

Depending on your application, you may be able to use what is called a voltage divider that uses resistors to scale down you input voltage to a max of 10V. Then you multiply your readings by the appropriate scaling factor.