RE: PicoScope 6424E Oscilloscope + Accessories: Not Satisfied

genebren — Thu, 08 Oct 2020 14:50:18 GMT

It is difficult to tell on the zoomed in images, but it does appear that you are using a relatively low sampling speed (1 M/S) for these tests. That leaves you with 1 usec resolution that might be skewing your results a bit. I would suggest a much higher sampling rate (1 G/S at least).

The realtime operation of the RPi makes it a relatively poor choice for accurate pulse generation. Even with the Arduino, a bit banging approach is going to be subject to some timing variation, like when interrupts occur (timer, serial, etc.). PWM generation using hardware timers (available on Arduino) will generate much more accurate results.

RE: PicoScope 6424E Oscilloscope + Accessories: Not Satisfied

Andrew J — Thu, 08 Oct 2020 08:56:51 GMT

Hi Sean,

I’m not clear on the title of this post - it implies there is a problem with the scope/accessories but from reading the post it would seem the scope performed well in these tests. The persistence colours look clear and the mask seems well-made.

You’re making readable and useful posts: I like your approach of trying out the scope to identify and debug problems rather than just a demo of features.