Inconsistent Output in NI 9263 DAC

M

mtnkh

Newbie level 6
Joined
Mar 1, 2021
Messages
14
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
164
Hi,

I am using an NI 9263 DAC converter to generate a 10KHz sine signal with a 5-volt amplitude. However, the problem arises when I zoom in on the output of the module, as it appears as shown below:

There is a 40mV difference in the peaks, which is causing trouble for me. I have tried changing the frequency and the sampling rate, but the issue persists. I wanted to ask if you know the reason behind this discrepancy?


Thanks
 

Sort by date Sort by votes
Hi,

The picture is useless. All wee see is a lot of orange..The only thing we can guess is that that the Y-axis shows the volts.
* we don't know nothing about the X-axis
* we don't know what tool it is (real digital scope with unknown resolution, simulation, samplling rate....
* we don't know what we see. Yo say 10kHz sine, but it's far from a sine shape at all

****
Besides the scope...
* how are your digital data generated
* what resolution and what range do your digital data have (not ADC resolution)
* ADC: what resolution, what sampling rate is used in your case (not what the ADC is able to do)
* what analog filters are used?

****
My wild guessing - and that's all I can do for now:
The problem is some kind of measurement artefact because of
* inappropriate analog filtering
* using an ADC sampling rate of around 500kHz

Klaus
 

Upvote 0 Downvote
Or maybe it’s some external source modulating the DAC output.

Garbage in, garbage out.

You need to provide a lot more information.
 

Upvote 0 Downvote
barry said:
Or maybe it’s some external source modulating the DAC output.

Garbage in, garbage out.

You need to provide a lot more information.
Click to expand...
Or may be it is some fixed point issue or he is just test-benching the forum responses.
 
Last edited:

Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…