how to continuously catch and save waveform with ni 5102

[neilshao]

one machine generate sine waves at random time . i want to continuously catch and save the waveforms in 10s by NI 5102.

how to do it ? 

many thanks!!

[KateB]

Hi neilshao,

There are examples in LabVIEW>>Help>>Find Examples>>Hardware Input and Output>>Modular Instruments>>NI-SCOPE (High-Speed Digitizers)>>Continuous Acquisition.

You can modify these examples toacquire only 10 seconds to achieve your task.

Regards, Kate

[neilshao · Accepted solution]

thanks for replay! but these is not one supporting NI .

I record waveform by  this method.

and the new promble is  that the different sample rate , the different waveform length. for example, when i set the sample rate is 4k, the waveform length is 12 sec. if sample rate is 10k, the waveform length is 8 sec. the signal under test 1k,the time constant is 10000.

now , i want to record 10 sec waveform . what is the best relationship between sample rate and the time constant?

[KateB]

Why don't you just keep data in array, and cut it off when number of samples for 10 secs are received?

Just check that array size is >= sampling rate*10, and do a subarray function on latest 10 secs.

[neilshao]

can the Fetch.vi  support ni5102 ?

[neilshao]

i try again! thanks!