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

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AngusBeef:
I'm a little uncertain reading through this thread - does the logic analyzer you guys designed improve anything off the Rigol design, or is it simply a matter of reducing the $400 price tag off the Rigol product to BOM plus hobby time?

spongle:

--- Quote from: thmjpr on September 03, 2019, 06:35:12 am ---Revision 2 PCB is here: https://gitlab.com/thmjpr/stm32f03_la_monitor/tree/master/PCB_Rev2

- See readme.md
- A 50 pin connector available from LCSC but has no polarized part in the middle, so could accidentally be plugged in upside down. One polarized version is: SFH11-PBPC-D25-ST-BK (digikey)
- CC1/2 resistor values might need to be played with or voltage measured, can't recall if I used what was on the schematic.

Attached some parts I bought from LCSC but its not the complete BOM, just use for sourcing ideas.

--- End quote ---

This is fantastic, if you have any spare boards / parts you'd like to sell I'm interested.

thmjpr:

--- Quote from: AngusBeef on September 06, 2019, 06:01:06 pm ---I'm a little uncertain reading through this thread - does the logic analyzer you guys designed improve anything off the Rigol design, or is it simply a matter of reducing the $400 price tag off the Rigol product to BOM plus hobby time?

--- End quote ---

Its mostly reducing the price tag. There are some small improvements, like if you want a longer cable you could buy a different length USB-C cable.


--- Quote from: spongle on September 06, 2019, 07:22:13 pm ---This is fantastic, if you have any spare boards / parts you'd like to sell I'm interested.

--- End quote ---

I have 3x rev 1 bare boards, I don't plan on buying rev2. $4 for just PCBs in a bubble envelope, modding required. Will send a PM for the pre-made board price.

whowe:
Hello thmjpr,
Is Rev2 like a "perfect" version so far?
Really love your USB-C idea. I'm thinking to make one and guess it can bring some fun time with my new MSO5072.

tv84:

--- Quote from: thmjpr on June 24, 2019, 01:20:53 am ---BTW there is a SCPI command for LA time offset, :LA:TCALibrate 0.0000002 +/- 200ns but its not working (read back is always 0), suspect in another thread that its not actually been implemented yet.

--- End quote ---

First of all, congratulations for your work!  :clap:

Now, my small contribution:

Those SCPI commands are implemented in the FW. I've checked them in the latest FW.  (and there are plenty of other functions that are not currently exposed to users, but equally implemented)

Don't know if you are aware of all the MSO5000 SCPI commands that are currently externally exposed? but maybe you have to manually enable "calibration mode". Try these commands:

:CALibration:ENTer
:CALibration:EXIT

I think Rigol has been using this type of protection in the latest equipments so that one doesn't execute unwanted calibrations. My guess...

Edit: These commands are only for the analog channels!  |O

Do you do a :LA:ACTive command before the calib to choose the specific digital channel before setting the delay?

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