Accelerometer Set-up in DAQ USB-6210: not getting changes in value

[traindoor]

Hello, 

I have been trying to set-up my accelerometer with USB-6210 and haven't been getting changes in output as I moved the accelerometer.

This is the 2-axis accelerometer I've been using: http://uk.rs-online.com/web/p/accelerometer-ics/8197275/?searchTerm=AD22037Z&relevancy-data=636F3D32...

The accelerometer is supplied 5V directly from the DAQ and has 2 signal outputs (2-axis) to ports AI8 and AI1, differentiating wiht respect to AI1, in the attached set-up

I have been getting an output of approximately 4.9V and this does not change when there is a physical change in motion. Could anyone guide me into the right direction? I'd appreciate that 🙂

Thanks,

traindoor

[Dennis_Knutson]

That first image is not explicit enough to explain what you connected. For a differential measurement, the first channel would be connected to ai0 and ai8. The second channel would be connected to ai1 and ai9. The second image shows only 1 channel specified. From the link, it is unclear whether you need two differential or two single ended connections and it is unknown how you have configured the single channel task but it's certainly not correct for anything with respect to ai1.

[traindoor]

Thanks Dennis for your reply.

I have uploaded a block diagram of the connections to the DAQ. This is a simple circuit without capacitors. In daq2.PNG, voltage_0 is dev1/ai0 and voltage_1 is dev1/ai8 (shown in connection.jpg). 

At the moment, we are getting a little fluctuation between 4.94 and 4.96 and that does not change with the physical movement of the accelerometer. 

Hopefully that's clearer

[Dennis_Knutson]

I still don't know whether you have configured the acquisition for differential or single ended. For single ended, you don't show a ground connection to the DAQ device. I also don't know what type of connection you are supposed to be using since the sensor document does not show that. For two channels as single ended, why not ai0 and ai1?

[Henrik_Volkers]

Well, RTFM ....   you need to learn to read the datasheet 🙂

At least three caps are missing 😉

The decoupling/ buffer cap rigth at the power input should be .1µF or higher , for the others see datasheet "