Using signal express with NI9227 timing settings

[DustDevil]

I have Signal Express LE and using modual NI 9227, I am trying to measure input current draw AAC. What should my timing setting be for "Acquisition Mode," "Samples to Read", and "Rate (Hz)" be if I want to read every .5 seconds and every 1 seconds? Can someone explain to me what the Time Settings mentioned above mean.  I am a Lab Technician learning as I go. My EE's are very busy and want me to do as much as I can on my own, please help.

Thanks

DustDevil

[C-Dav]

DustDevil,

First, welcome to our forums!

Second, we have a great KnowledgeBase article here that talks about the various timing settings you have available and what they each will mean for the timing of your measurements.  In that article, "number of samples per channel" corresponds to the "samples to read" you have available in SignalExpress.

Also, the 9227 is one of our modules that uses Delta-Sigma modulation to get a higher resolution, which has some caveats as far as sampling rate is concerned.  There is a minimum data rate (about 1600 samples per second) that you cannot sample below.  If you set a rate lower than 1600 you'll still be getting data back at 1600 S/s.  This help file describes the "Subset and Resample" step you can use in SignalExpress so you can acquire data at the minimum rate of the device and then resample the result to end up with data at the "rate" you actually want.

Give those a look and re-post if you have any follow-up questions or need clarification.

Best,