how to set 5122 acquire signal using 8-bit resolution

[smartkuku]

I encounter a application: continous acquire signal at 100MS/s within 10 second and streaming it to disk. I decide use NI 5122 and the StreamStor card. because of the PCI rate limit, i must set the 5122 using 8bit to acquire data. then the question is how to set 5122 using 8-bit resolution to acquire data?

[Jeremy R.]

The 5122 will have a 14 bit ADC by default and that cannot be changed, but we can change the data that we fetch from the board to be either 8, 16, or 32 bit representation.

In LabIEW, for example, there are lower level VIs called niScope Fetch Binary 8,16,or 32. These VIs will pull the data from the board in those three sizes. You can examine their functionality with some of the shipping examples that come with the NI-Scope driver. The example niScope EX Fetch Forever.vi uses the 8 bit fetch option.

Hope this helps.

Best Regards,
Jeremy R.
NI - Applications Engineer

[Jeremy R.]

Penggi Liao,

I have more information you might be insterested in. If you could, post your email address and we can email you the rest of the information. Thanks.

Best Regards,
Jeremy Ross
NI - Applications Engineer

[smartkuku]

Thank you for your reply, my email address is pengqi.liao@pansino.com.cn
The fetch 8 bit.vi truncate the higher bit, it does not fit my problem. I have receive a answer from Michael from NI. He told me how to do it, but I think we can discuss this problem.
Thank you for your help.