Sampling with Ni USB-6009 + Labview

[Daniel_Gutierrez]

Hello all, I have a NI USB 6009 and I want to use labview for sample a signal with a frequency of 500 Hz but I dont know which mode sample of DAQ Assistance to use, and how to configurate it about sample rate.

I want to have a period sample of 3 kHz at least.

I´m trying with these 2 files, with first one signal achieved with some frequencies is like a AM modulation, with second one, each second there is a discontinuity because N samples have to be sending and shown each second and may be that generate a delay.

Thanks

[GerdW]

Hi Daniel,

to read a signal at 500Hz you should use "continuous sampling" with a sample rate of >=1000Hz (you already want to use 3kHz).

Instead of learning by trial-and-error you could simply look at the example VIs provided by NI. Just look for "continuous" DAQ examples...

[HussainChachuliya]

i am trying to make a real time oscilloscope with usb 6009 as the data acquiring device. I want to configure it for the best acquisition. please help me with the configuration of daq assistant. also, what is the maximum frequency signal that we can acquise using usb 6009...??

[Dennis_Knutson]

http://digital.ni.com/manuals.nsf/websearch/CE26701AA052E1F0862579AD0053BE19

[HussainChachuliya]

sir, i have this manual with me... but its a bit difficult to understand for me... could you please help me with just the settings of daq assistant for the highest frequency signal that can be acquised through usb 6009

[Dennis_Knutson]

Do you understand Nyquist? That says you need at least twice the sample rate of the input frequency. That of course, does not accurately recreate the shape of the waveform.

[HussainChachuliya]

i understand that but what is the maximum acquisable frequency through usb 6009??

[HussainChachuliya]

actually i need to take the analog signals from a function generator and display it on labview. and i am using usb 6009 for that purpose. but what is the maximum frequency of signal that can be achieved through usb6009?

[Dennis_Knutson]

If you are using a single channel, then divide the sample rate by 2. As I said, this will not recreate the input waveform. To acquire a sine wave and have it look like a sine wave, figure on a frequency about 1/10 the sample rate.

[HussainChachuliya]

i am having dual channel oscilloscope VI... and i would be taking 2 analog inputs from usb 6009... can u specify some numeric limits...?