Unable to properly configure MCC board with LabVIEW

[Bob Plotke]

I have discussed this issue of LabView to displaying the appropriate scaling of voltage that is known by oscilloscope and DAQami data capture and display of AtoD signal from MCC's USB-1608GX.  Attached is National Instrument's engineer email stating the problem and giving the responsibility of its resolution to MCC.  

Bob Plotke 

805.416.6243

bobplotke@twc.com

National Instruments Email Stream.rtf

[JRys]

Hello Bob,

From what I could determine, you're indicating that when compared to DAQami the LabVIEW data is offset by several volts. Is this a fair albeit simple explanation of what's going on? Could tell me how the 9 volt battery is connected to the USB-1608GX?

Thanks,

John

 

[Bob Plotke]

Hello John, 

Yes there is a voltage scaling issue.  I have enclosed a picture of the DAQami properly scaled output for your review with the LabVIEW data output.  This 9 to 1 volt output is connected to the USB-1608GX on CH0 H and ground. 

Bob Plotke 

[JRys]

Hi Bob,

Could you close down LabVIEW and run InstaCal. Double click the USB-1608GX in the board list and set the input mode to 16-channel single-ended mode. Close down InstaCal before restarting LabVIEW, otherwise the setting won't take effect. InstaCal doesn't save the setting until it closes and LabVIEW (not your program) reads the setting when it starts up.

DAQami is different, for the most part it doesn't use InstaCal.

Best regards,
John

[Bob Plotke]

Thank you John,

Your solution worked beautifully. 

Bob Plotke