EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: KedasProbe on April 15, 2014, 05:59:23 pm
-
I was curious if I could see the delay between signal at the (probe) input and seeing it on the screen.
So I did connect a square wave at the input and also to a red led.
(The led is the reference to see when the square wave is high)
Now I captured the screen at 5x faster speed. (digitally I slowed it down 2x to get a total of 10x, 0.1s->1s)
The scope triggers on rising and falling edge.
I marked "out of sync" in the video when you see that the scope is not longer in sync with the led (the source).
10 Hz on/off led, signal display delay, time x 10 (https://www.youtube.com/watch?v=jNIAVN_DwZw#ws)
I did not see an obvious (big) delay BUT I did see that the scope (my HMO1022) doesn't behave the same all the time. Sometimes it is going out of sync and shows the falling and rising edge at the same time in one screen update, even the out of sync behaviour does not seem predictable.
Any idea why it has trouble behaving the same all the time? (the input signal is the same)
It does look like it displays all edges (20/s) just not the same way over time.
Is this some intern interrupt for something hence changing its behaviour?
Does your DSO also show such different behaviour while your signal did not change?
(the square wave of 10Hz is amplitude modulated with a 2Hz triangle to make it easy to see multiple edges)