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pulse dissaper in digital scope just by looking at different signal in other channel.

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I have HANTEK 6022BE, and I'm monitoring tree signal using it,

  1. FS (Frame sync clock)
  2. Pulse
  3. Transfer complete I'm using two channel of scope to monitor pair of these.

The problem is when I'm looking at signal 1 and 2 I can see here: (The yellow is 2 and blue is 1.) 1_2

In looking at 2 and 3 (yello is pulse and blue is TC): 2_3

Magically one pulse of signal 2 (pulse) has been vanished! But why? Generally looking at pulse alonely will causes neglecting one pulse. But only by signal FS all 6 pulse will be visible. How this can be!!

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Different trigger? (2 comments)

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The problem was the transient you can see in the first picture, the blue one. When I connect the scope to it, it becomes stablize. Otherwize it is noisy and because of this other signal changes.

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