Eclypse z7 acqmodeScanScreen mode

[M. Hamza Öncüer]

Hi, I want to use acqmodeScanScreen mode but I did not understand how it works exactly, I mean can it do continuous lossless data acquisitions if I select scan screen, 10MHz sampling rate and 128Mi buffer size at z7 ? 

[M. Hamza Öncüer]

It is kind of important, I would be glad if someone answer me quickly.

[attila]

Hi @Hamza Oncuer

Use the default single capture mode. This lets you capture up to 256Mi samples @ 125MHz on 1, 2 or 4 channels.
The scan modes are for monitoring and recording for longer (above device buffer size) or unlimited streaming. 

 

[M. Hamza Öncüer]

Thank you very much, can I understand if the lost or not ? Does it give warning if the the data lost ? What is the maximum adc sampling rate I can choose is I select 128Mi buffer size ? 

Edited December 1, 2023 by Hamza Oncuer
grammer

[attila]

3 hours ago, attila said:

This lets you capture up to 256Mi samples @ 125MHz on 1, 2 or 4 channels.

 

3 hours ago, attila said:

 

[zygot]

Attila: "This lets you capture up to 256Mi samples @ 125MHz on 1, 2 or 4 channels. "

To be clear, I believe that what you intend to say is that a user can capture 256 Mi samples of 1 channel, 128 Mi samples on each of 2 channels, or 64 Mi samples on each of 4 channels at 125 MHz in one shot mode. How many samples of 3 channels can be captured? And these are guaranteed to be contiguous samples? Edited December 1, 2023 by zygot

[M. Hamza Öncüer]

Did I understand correctly the screen mode is actually does stream to pc, the record mode on other hand stores the captures to ddram and after the ddram buffer filled it sends the data to the pc is that correct ? I faced another problem the ethernet is actually performed worse than the usb, the pc I attached the z7 supports gigabit ethernet.

[attila]

Hi @Hamza Oncuer@zygot

The 'single' capture mode stores the samples in the device buffer (DDR RAM of EclypseZ7 or ADP3X50 in Standard boot mode). Only after the capture is done is the data transferred to the host/computer. Yes, the capture is contiguous, up to 256Mi samples (in total) and 125MHz (for each cannel) on 1, 2 or 4 channels, or 8 channels at up to 62.5MHz. 3 channels multiplexing is not supported, so having 3 channels enabled it will actually capture on 4. 
The scan modes are intended for slow signal monitoring, like ECG signals or measurements where you are only interested if the last N samples regardless of timing to previous chunk of samples.
The 'record' is for stream capturing above device buffer size or unlimited. In this case the buffer is used as a FIFO. The maximum sample rate is limited by the USB or Ethernet. 

The gigabit ethernet has potential for a bit higher transfer rate than USB. I obtained the following with direct connection, but using switch or router could reduce the rate or greatly increase the latency.