6025e Analog Input not shown correctly

[SuperWolfi]

I use a 6025e on the Analog input channel 0 are 7 volt connected. The Testpanel show this Voltage but if i read this channel via AI_VRead(DAQ_Devicenumber,DAQ_force,1,&force)
i receive only 4.99 Voltage.

why ?
what should i do, to solve the problem

[JustinBritten]

SuperWolfi,

If you look at the 6025E User Manual, in the Specifications Appendix A, you will see that for a gain setting of 1 you will have an input range of +/-5V. If you use a gain setting of 0.5 then your input range is expanded to +/- 10V.

In your call to AI_VRead you are using a gain of 1, instead of 0.5. For information on how to set the gain for your board, please reference Appendix B:
Analog Input Channel, Gain Settings, and Voltage Calculation of the NI-DAQ Function Reference Manual. You will find that -1 translates to a gain of 0.5.

6023E/6024E/6025E User Manual
http://digital.ni.com/manuals.nsf/websearch/0C88F40FFE7F28CD862569AE00574AC1?OpenDocument&node=1065_US

NI-DAQ Function Reference Manual for PC Compatibles
http://digi
tal.ni.com/manuals.nsf/websearch/1630A0B68738B269862567C1007A2912?OpenDocument&node=132100_US

Regards,
Justin Britten

Applications Engineer
National Instruments