ADP3540 - slow acquisition rate

[mturner]

Hi All,

We're using the ADP to average some samples together and it works great *sometimes*

Below, it's acquiring slowly; See Acquisition # 40/2000 @ 292.97kHz

Sometimes it smoothly collects all the data, but sometimes this will show up and the saved waveform will be very noisy. We've tried Linux mode, Ethernet output, and everything else we could think of. Does anyone know why the scope does this, and how we can avoid collecting the noisy traces?

[JColvin]

Hi @mturner,

I have moved your question to a more appropriate section of the Forum where the engineer much more familiar with the ADP3450 and WaveForms oscilloscope tool will be able to see and respond to your question.

Thanks,
JColvin

[attila]

Hi @mturner

The averaging or oversampling requires stable trigger and periodic signal so consequent captures are averaged and phased correctly.
In your screenshot it looks like it identified a periodicity of 297kHz and phases the signal according to this.

Notice the "Channel range will be extended" indicating that with such offset value the high vertical range is used. You may consider using the AC coupling.

The noise capture can be disabled under Time/Options or showing disable for each channel individually under the Channel's gear menu.

[mturner]

Success! 

What you said about the trigger made me second guess how patterns was triggering the scope. I probed that clock signal with channel 2 and it's collecting the data smoothly

We were using these settings before, with patterns selected as the trigger in the scope

 

In any case, we're up and running again, thanks for the support

-Mike