Problem associated with multifunctional DAQ

[UICT]

Hello Sir/Madam,

                           This is for the third time I am mailing in context to the porblem associated with multifunction ADC card owned by me.

Problem lies with gradual drop in the voltage drop along the time(depending on the data acquisition rate). I need response from your side to further discuss the problem in comprehensive fashion.

Waiting for kind reply.

Thanking you

[Jarrod_B.]

Hello UICT,

I understand that you are seeing some strange behavior with the voltage readings on a multifunction DAQ board.  It sounds like the voltage level is dropping over time.  If this is the case, you may be reading a floating voltage. 

Please make sure that you are connecting your signal to the DAQ board with the proper terminal configuration.  You can find more information on this in Field Wiring and Noise Considerations for Analog Signals.  In particular, pay attention to Table 1, which summarizes which terminal configurations to use for floating and ground-referenced signal sources. 

You should also try just connecting a simple DC source (a battery, for example) to one of the channels on your DAQ board.  Then using Measurement & Automation Explorer (MAX), open a test panel to that device, and try reading the voltage from that channel.  If this is working, the behavior you are seeing may be due to the particular signal you are trying to measure. 

If you have some further questions on this issue, please provide some more detailed information about your setup, including:

1.  Which DAQ board you are using.
2.  What type of signal you are trying to measure.
3.  Which exact pins you are connecting your signal to on the DAQ board.

Best regards,