Various sampling resolution

[bikekowal]

Hi,

I am using NI PXI 5122 card to acquire signals from Thorlabs PDA36A-EC amplified detector. I want to acquire signals with various sampling resolutions - 8 bit, 10 bit up to 24 bits. How can I do that - how can I set required sampling resolution? Is there any example I could possibly use for this task?

thanks in advance,

Marcin

[Joseph_Loo]

How can you get a 24 bit resolution sample with a 14 bit AD converter?

[bikekowal]

sorry, my mistake. I meant a PXI 5922 digitizer...

[Joseph_Loo]

When I wanted to reduce the resolution, I mask the bits out. But this particuliar device you have to be extra czreful, because the bit resolution is dependent on the sample rate. 500Ks 24 bits, 1Ms -22 bits, 5 MS 20 bits, 10 MS 18, and 15 M 16 bits.

I do not understand why you want to limit the resolution, but remember, resolution and accuracy is not the same thing.

[bikekowal]

why do I want to limit the resolution? I prepared some algorithm and I need to try use it with various data bit resolutions. I want to do it during the acquisition process, not after data registration (I don't want to reduce the amount of data using some app). That's why I want to change the resolution. Anyone have an idea how it can be done?