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RPL1116 (MSO1000Z) and PLA2216 (MSO5000) Active Logic Probe teardown

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Rerouter:
Does the Channel - Channel skew line up with your trace lengths, if not we may be able to forward correct for it on a new PCB version.

thmjpr:

--- Quote from: Rerouter on May 23, 2019, 06:29:20 am ---Does the Channel - Channel skew line up with your trace lengths, if not we may be able to forward correct for it on a new PCB version.

--- End quote ---

The trace lengths were matched to under 1cm or so, speed of signal in FR4 is ~15cm/ns, so 70ps. I can't see it making too much difference, its well under their specifications. The skews sort of just jump around, if I averaged a bunch of captures then I might see the relationship you are referring to.

If we wanted to extend the traces to make up for the 150ns LA->analog delay in the scope, we are talking about 22m of trace! So I'm sure the official Rigol pod does not line up with the analog channels either.

I originally had the case try to duck under the cutout in the rigol scope, but it didn't quite fit. So pulled it forward to be in front instead. The OLED module sits inside that top bezel part.
If you don't need a screen (its not as necessary as I thought because the idle signals will be clearly inverted if the cable is upside down), then removing that top makes it a simpler design.

Rerouter:
Ah sorry, misread, though it was digital - Digital skew, I would assume the rigol would have a setting somewhere to adjust digital skew.

TK:
Today I noticed the LA can be activated without the digital probe connected (I don't have one).  What is the purpose of the probe detect on pin 1?

I don't have any noise in the digital channels when the LA is active and there is no probe connected to the scope

thm_w:

--- Quote from: TK on June 07, 2019, 04:09:16 pm ---Today I noticed the LA can be activated without the digital probe connected (I don't have one).  What is the purpose of the probe detect on pin 1?

I don't have any noise in the digital channels when the LA is active and there is no probe connected to the scope

--- End quote ---

You get to adjust LA settings and see what is in the menus with nothing connected which is OK. But yeah the software should probably auto-disable the channels from showing up on screen.

The noise will appear as soon as you short pin 1 and 2 together. So the probe detect pin is enabling buffers/inputs, might save some power and reduce noise, assuming its a hardware disable. The calibration menu option is also disabled.

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