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

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thmjpr:

--- Quote from: whowe on October 04, 2019, 01:35:29 pm ---Check this problem.
Without connecting any satellite adapters. Some channels are high, some are low. Especially the D6, it has a 32MHz (not accurate) pulse. Don't know where it picks up from.
As a reference, a put a 10MHz sine ware on Analog Channel 1. See the screenshot.

--- End quote ---

This is normal. Once you plug in a working adapter all channels on that adapter should drop low (if its high cable is backwards). I was considering terminating the diff pairs, specifically D6 to try to get rid of this trace "noise" but I got down to 10kR and it was still there so I stopped. Also it would take a ton of resistors.

The issue is some internal noise in the oscilloscope and the fact that they seem to have not pulled/terminated the signal inputs in any way. Which is probably an OK decision if you want to save some cents.

Turn off any channels you are not using to avoid the distraction.

whowe:

--- Quote from: thmjpr on October 04, 2019, 10:39:28 pm ---
--- Quote from: whowe on October 04, 2019, 01:35:29 pm ---Check this problem.
Without connecting any satellite adapters. Some channels are high, some are low. Especially the D6, it has a 32MHz (not accurate) pulse. Don't know where it picks up from.
As a reference, a put a 10MHz sine ware on Analog Channel 1. See the screenshot.

--- End quote ---

This is normal. Once you plug in a working adapter all channels on that adapter should drop low (if its high cable is backwards). I was considering terminating the diff pairs, specifically D6 to try to get rid of this trace "noise" but I got down to 10kR and it was still there so I stopped. Also it would take a ton of resistors.

The issue is some internal noise in the oscilloscope and the fact that they seem to have not pulled/terminated the signal inputs in any way. Which is probably an OK decision if you want to save some cents.

Turn off any channels you are not using to avoid the distraction.

--- End quote ---

Thank you.
When probe 1 (D0-D3) is connected, D0 has opposite polarity than D1-D3. Same thing happens with probe 3 (D8-D11), D11 is opposite to D8-D10. (Maybe the pin definition is incorrect?)
And as probe 2 and probe 4, it's a mess, too much noise, I even can't tell the polarity. Maybe the voltage reference pin is floating because of bad soldering.

The good thing is that I've finally found a USB type-c cable that works.

My bad, I forgot to solder F1-F3 and R5/R6, I thought they're only for the optional MCU. lol

Everything works as expected now!

My next step would be 3D-printing a proper case/handle for the main board.

;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D

Again, thank you thmjpr and all other friends who devoted time and knowledge in this thread/project.

whowe:
A small tip for choosing USB type-c cable: buy those 3.1 Gen2 ones (with or without e-Markers does not matter).
Those cheap ones claimed as "JEM" or "Google" 3.1gen2 cables are known working.
Mine in the attached photo is called Google cable, 0.5M length.


Here's the link for these cables, visit and scroll down you can see detailed pictures (even teardown) of them.
https://item.taobao.com/item.htm?spm=a230r.1.14.16.41cc4735N9EF3q&id=574580414281&ns=1&abbucket=3#detail

thmjpr:

--- Quote from: whowe on October 07, 2019, 07:58:59 am ---A small tip for choosing USB type-c cable: buy those 3.1 Gen2 ones (with or without e-Markers does not matter).
Those cheap ones claimed as "JEM" or "Google" 3.1gen2 cables are known working.
Mine in the attached photo is called Google cable, 0.5M length.
(Attachment Link)

Here's the link for these cables, visit and scroll down you can see detailed pictures (even teardown) of them.
https://item.taobao.com/item.htm?spm=a230r.1.14.16.41cc4735N9EF3q&id=574580414281&ns=1&abbucket=3#detail

--- End quote ---

Thanks, those look like decent cables, incredible for $3-4. Also interesting about the emark chip, it appears to just connect to CC1/CC2, so the only possible issue it would cause would be there, not a big deal.

I've uploaded solidworks files here for a beta case: https://grabcad.com/library/beta-la-case-parts-1 (I think login is needed, can use bugmenot.com). Nothing really holds it together, my plan was to glue it once the board was fully modified.


edit: I may still have D11 flipped on Rev 2, not sure, user WhoAmI has measured it as being OK, thank you.

hedehede81:
guys, is there an estimate how much it costs right now to make this cable?(counting time as hobby time) is there any possibility we can see a production of these(Kickstarter etc)? or waiting for Rigol cable to go on sale makes more sense?

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