This discussion is in follow-up to a previous thread which was closed due to the delay in our response. I would like to re-open this discussion on the basis that the issue is still unresolved and that new information is available. Here is a link to the previous thread.
The update is as follows:
The customer has confirmed that they were using 480p60 in the example scope traces provided. If you look at the a-b delta number in the upper RH corner, you can see that it is captured as 37.10ns in both the non-doubled (single period) and doubled (two periods) captures. This translates to a measured frequency of 27MHz. You might have been looking at the “T” time in the capture which was not set to correspond to a period.
Any assistance that you can provide in terms of providing additional insight would be greatly appreciated.