Products > Test Equipment

New (toy?) DSO+LCR meter - Fnirsi DSO-TC2 (june 2022)

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indman:
ARM MM32F103 RET6 - component tester
WCH CH32F103 C8T6 - oscilloscope ;)

ledtester:

--- Quote from: indman on July 24, 2022, 08:14:39 am ---ARM MM32F103 RET6 - component tester
WCH CH32F103 C8T6 - oscilloscope ;)

--- End quote ---

I couldn't tell if you were serious, but it appears you are correct.

At the 3:00 mark this Russian language video asserts that the MM32F103 is responsible for the component tester and the WCH chip for the oscilloscope:

FNIRSI DSO-TC2 - осциллограф + транзистор-тестер
https://youtu.be/PXzY-pvd7OM?t=3m

At that point there is a close-up of the PCB and you can see the triple pair of 680R and 470K resistors near the top and they are connected to the MM32F103:



I'm curious what that chip in between the two MCUs is.


indman:

--- Quote from: ledtester on August 21, 2022, 03:07:19 pm ---I couldn't tell if you were serious, but it appears you are correct.

--- End quote ---
This became clear immediately after it was possible to read the marking of the chips.Because the CH32F103 C8T6 FNIRSI is also used in other pocket oscilloscopes.


--- Quote from: ledtester on August 21, 2022, 03:07:19 pm ---I'm curious what that chip in between the two MCUs is.

--- End quote ---
RS2227-Analog switch
https://datasheet.lcsc.com/lcsc/2202251530_Jiangsu-RUNIC-Tech-RS2227XUTQK10_C783419.pdf

CChin254:
Here are the chips used on the FNIRSI Digital Oscilloscope & Transistor Tester:


(Image was from Dave Jones' Flickr account.)

snapper:
the replacement TC3 only has a 100-pin µC from which unfortunately the labeling has been removed   :rant:
But with the TC3, the designer must have run away with it. Why do you need almost 40 transistors in the measurement circuit?

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