Products > Test Equipment

Component tester with I(U) diagram?

<< < (5/6) > >>

ebastler:

--- Quote from: kripton2035 on September 24, 2024, 08:34:43 am ---this https://www.aliexpress.com/item/1005006160645147.html
and a small supply - battery - adc board.
and a big amount of software...

--- End quote ---

Yes, that might work. But I don't see much in terms of I/O expansion headers? I might look for a microcontroller which can handle the AD/DA conversion on-chip and just requires analog amplifiers (or dividers) externally. Pure 3.2" touch displays with SPI interface are available from AliExpress as well, a bit cheaper than the display/µC combination.

ebastler:

--- Quote from: tautech on September 24, 2024, 08:52:51 am ---Why ?
Do you have a 2ch AWG ?
20V capable into HiZ ?

You already have a DSO with an excellent X-Y mode.
Is the procedure Mike used insufficient for your needs ?

--- End quote ---

As stated above, I am looking for something with less cabling, very quick to use, ideally handheld. I am not thinking of a precision curve tracer, but rather a "quick check" for components, and it should not take more time to set up than to do the actual measurement.  :)

EDIT: Having said that, Mike's design provides a great reference on "how to do this properly". I'll try to understand it and use it as a guideline, but can probably cut some corners for the limited accuracy and flexibility I am aiming for.

ledtester:
Perhaps you can get the FNIRSI 1013D hackers interested:

https://www.eevblog.com/forum/testgear/fnirsi-1013d-100mhz-tablet-oscilloscope/

They have developed an alternate firmware for the device so that would give you a big head start on the software.

ebastler:
Just as a cross-reference -- of course this topic has been discussed before on the forum: https://www.eevblog.com/forum/beginners/dirt-cheap-and-simple-scope-based-component-tester-curve-tracer/. References to various Octopus-style adapters for oscilloscope & function generator (or AC line voltage), and a very nice introduction to the fully integrated Huntron Tracker which I had not been aware of. (A dedicated I/U tracer with built-in little CRT.)

I have ordered a couple of 3.2" touch displays and started drafting a schematic and a PCB layout. This should make for a neat self-contained unit, the size of a pack of cigarettes (or playing cards, choose you preferred vice  ;)). I am planning for +- 12V maximum range, plus the ability to reduce the test voltage and zoom in on the current measurement in software, using the 12 bit ADC/DAC in an STM32. Does +- 1.5V as the smallest range seem reasonable for safe in-circuit testing?

Most importantly, I already have a name for it: The working title is "Duopus", an Octopus with only the two test leads left... I will open a new thread in the Projects section when I have something tangible.

kripton2035:
one suggestion: plan to add a third test lead, to compare two boards quickly, by having two traces in different colors.
like what does the huntron but with a crt display the two traces are the same color...

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod