First off, Hi all, first post for me.
My 1054Z arrived yesterday a few hours before Dave's video
Lots of intersting information in this thread, will have to re-read thoroughly later. Looking after my kids today however I found some time for a tinker with the AC coupling jitter issue
I took the trigger output of the 1054z and looped it back up the clacker of chan2 while still triggering off chan 1 which was being fed by a function gen.
There were some intersting observations.
1. The trigger edge on CH2 (blue) always begins between ~352ns and ~360ns after the trigger indicator**
2. In DC trigger coupled mode, the CH1 (Yellow) output from sig gen is always steady, however the trigger edge jitters between 352-360ns..
3. In AC trigger coupled mode, the CH1 output from the sig gen always jitters, but the trigger edge is steady*
*Except at 12MHz and at 24MHz (+/- ~2MHz) where both the CH1 sig gen source and the CH2 trigger edge are jittering. But interestingly, not by the same offset when played back from a recording.
**I confirmed this by connecting the trig out of the 1054z into the ext trig input of my old 1052E and fed both with the same input. Sure enough, a trig offset of ~352ns was required on the 1052e to align the edges of a 10HZ square wave. Looks like the trigger hardware takes between 350-360ns to process an incoming waveform so must need to compensate for this variance when displaying the waveform on the screen (assuming the trig out is good). /shrug
I have attached some pictures.
The source into CH1 (yellow) of the 1054z is a sinewave from a Rigol DG1022, is DC coupled with BW off.
Triggering is on CH1, Edge, Up slope, Normal sweep.
I did also notice that in the Rigol specs for the 1000Z series the pulse width range has a minimum of 8ns, which may also come into play here. Not sure, but it's right in my 352-360 ish range.
What does this all mean in terms of hardware/software? No idea! I'm just a beginner at electronics, however I thought I'd throw this in.
I don't think this is ever going to be an issue for me in reality. I never used AC triggering until this came up, however now that I know about it I'll probably find a use now
Jon