Using of NI USB-5133 for dynamic signal acquisition data

[drnikitin]

Dear friends. I'm new in LabVIEW, and I urgently need your help. I have NI USB-5133 digitizer and want to use it for measuring time of flight of ultrasonic pulses reflected from moving wall with time of repetition of measurements about 1 millisecond. Unfortunately my experiments show that minimum possible time after which digitizer is ready to get a new portion of data is only about 10 milliseconds. Please tell me am I right, and if I'm right tell me how can I use this digitizer to measure data with speed of 1000 measurements per second or about 

I'll be very happy to get any help,

Dr. Nikitin

[MXI Master]

Dr. Nikitin,

How many samples are you trying to acquire in each record? The record will be a single shot of continuous acquisition, and can be done at great speeds. Each time you re-initialize your acquisition it does take some time to set up, and I believe that is why you are probably getting slower than expected results.

Please, tell me more about how you would like to acquire your data.

Also, for future reference please post about the USB-5133 in the High Speed Digitzers portion of our Discussion Forums.

[drnikitin]

Thank you Marshall,

I want to acquire time interval of 100 microseconds at sampling frequency 50MHz, that is about 5000 samplings each record. I need to get about 1000 records per second, but now I got only 100 records per second. And my question is: how much time does it take to reinitialize the digitizer via USB?

[Paul_C.]

Hi Everyone,

This question was answered on the thread found here.  Unfortunely, there is no way for us to speculate on how long the reinitialize time will take because it will be system dependant.  You could use some timing vi's to calculate an average reinitialize time, but this could change during times of higher cpu usage etc.

I hope this helps,
Paul C.