02-25-2013 12:42 AM
I have a daq 6009. I sent a optical signal. DAQ provides a output which varies in 3rd decimal place. I done averaging all using a program which I'am attaching with this. So can you please help me in this regard
02-25-2013 11:29 AM
If you take a look at the 6009 specification, http://www.ni.com/pdf/manuals/371303m.pdf you’ll see that the analogue output is 12 bits, at 5 volts range the smallest theoretical resolution will be 0.00125v. Then when you take a look at the Absolute accuracy you’ll see that it’s typically 7 mV.
If your looking for 4 decimal places of accuracy you will have to look for a higher spec. device.
02-25-2013 09:51 PM
so through programs we can't make it much stabler than now can you please sent some help such that the DAQ will be stable . Please reply
02-26-2013 02:19 AM
I’m afraid I don’t know enough details to recommend a suitable card. If you take a look at the available DAQ cards in ‘Products and Services’ you can check the specifications online. You could also contact your local NI sales for advice.
02-26-2013 04:37 AM
answer not matches with my question .Please read the question?
02-26-2013 06:13 AM
You need to find a DAQ with a lower Absolute Accuracy.
Also, looking at the spec, you can get a better accuracy with a Differential measurement than you can with a RSE. Apparently the RSE only works in the +-10V range. By changing to a differential, you can get down to a +-1V range. That will help your resolution a little bit. Just wire the ground to the - terminals on the DAQ.
Another issue could be noise in the system.