Our NI USB-6343 device is not outputting voltage values below -4 or above +4 volts.

[brianbat]

We are having trouble with our NI USB-6343 device.  Using AnalogOut, the output values supported are only -4 to +4 volts.  We cannot get any voltage values above or below to work properly.  Can someone please tell me what could be wrong, as we should be seeing values from -10 to +10 volts.

[DavidF_NI]

Hi Brianbat, 

That behavior isn't right. How are you measuring the output? Do you have a load on the terminal? The card can only drive 5 mA so your voltage would probably start dropping if you are pulling more current. 

Best,

David F.

Technical Support Engineer

National Instruments

www.ni.com/support

[Henrik_Volkers]

800 Ohm (or 1k) load?

[brianbat · Accepted solution]

Thank you for the answers. The 50ohm impedence was causing some clipping on the top and low peaks.  We have since solved the problem by connecting a voltage follower circuit to overcome the impedence issue.