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Q&A Siglent1104 oscilloscope channels lagging

First I noticed that clock begins before chipselect gets pulled low on SPI. After eliminating potential sources I started to suspect the scope. I connected all 4 channels to function generator at d...

3 answers · posted 2y ago by Elleanor Lopez‭ · last activity 2y ago by Elleanor Lopez‭

Question oscilloscope

#1: Initial revision by

Elleanor Lopez‭ · 2022-07-04T09:30:16Z (over 2 years ago)

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Siglent1104 oscilloscope channels lagging

First I noticed that clock begins before chipselect gets pulled low on SPI. After eliminating potential sources I started to suspect the scope. I connected all 4 channels to function generator at different frequencies and observed 25ns gap between channel pairs. The probes were all the same 100Mhz stock probes that came with the scope set at x10, the 'deskew' was 0 on all channels. The 25ns was constant across different frequencies. On/off, auto calibration and factory reset did not fix the issue:
![Image alt text](https://electrical.codidact.com/uploads/PEiYaMbAGnXEbzGiqmW8EFcN)
![Image alt text](https://electrical.codidact.com/uploads/KhbgfnPSX9RbNLinv8nsvAZ3)

What could be the reason for this? Is this a bastard scope?

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