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Siglent SDS1104X-E, Dual IC, Dual Pulse with strange interaction ?
Bionicbone:
I am just getting used to my new Siglent SDS1104X-E so forgive me if this is a stupid question :-DD
I have an ESP32 & a Teensy 4.0 powered from the same 3.3 volts bench supply, each is set to output 1kHz pulse, I simply wanted to see the different difference in the pulse and practice with the oscilloscope without keep pressing the default button and auto setup.
I notice that as each pulse changes state there is an interaction seen on the other pulse which is in a stable state.
My question is, is this some strange behaviour with the oscilloscope or is it actually the circuit in some way that I should be aware of ?
Bionicbone:
Intestingly
1) If I only connect one probe groun lead its not as bad but as far as I am aware you should always ground each probe.
2) If I use the internal 1Khz as the other signal that is uneffected thus suggests to me it is the circuit ?
tautech:
There’s nothing strange about channel crosstalk, it can be a real thing just as grounding effects can be too.
For signals with the same reference only one ground clip is required.
2N3055:
Look up the term ground bounce...
Bionicbone:
--- Quote from: tautech on March 24, 2023, 07:39:12 pm ---For signals with the same reference only one ground clip is required.
--- End quote ---
Forgive me, can I drill into this a little, two pictures here.
1) Yellow probe in use and grounded.
2) Yellow probe in use, pink probe grounded.
Notice there is significantly less ground bounce. Rise, fall times are recorded as much quicker, and peak to peak voltage lower (probably due to the ground bounce). To be fair it is like there are two different signals.
Why, what do I not understand ?
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