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Comments on Pulse disappear in digital scope just by looking at different signal in other channel.

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Pulse disappear in digital scope just by looking at different signal in other channel.

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I have a HANTEK 6022BE oscilloscope and I'm monitoring three signals with it:

  1. FS (Frame sync clock).
  2. Pulse.
  3. Transfer complete.

I'm using two channels of the scope to monitor a pair of these.

The problem is when I'm looking at signal 1 (in blue) and 2 (in yellow) I see this:

1_2

When looking at 2 (pulse, in yellow) and 3 (TC, in blue) I get this:

2_3

Magically one pulse of signal 2 (pulse) has vanished! But why?

Generally looking at pulse alone will cause neglecting one pulse. But only by signal FS all 6 pulses will be visible. How can this happen?!?

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1 comment thread

Different trigger? (2 comments)
Different trigger?
Lundin‭ wrote almost 2 years ago

On the first picture you trigger on ch1. On the second you also trigger on ch1, but on a different signal. Meaning that you are viewing that signal at different points in time. Since we have no idea what signal this is, it is hard to say anything else. Maybe there are 6 pulses at some point in time but 5 at some other point.

mohammadsdtmnd‭ wrote almost 2 years ago · edited almost 2 years ago

I've changed now. Two are the same. When channel 2 is free runnig also the pulses reduces to 5. But buy using channel two being FS the pulses of channel 1 became 6 equal to rsing edges of FS on channel 2. Pulse is triggered by FS rising edge in MCU.