Residual voltage causes asymmetric resistance measurements
@DocMacLovin
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Simply restoration master class. K*U*D*O*S
@realcygnus
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👍
@MichaelEhling
Жыл бұрын
Why not be picky about the reflowed soldering?! It's satisfying and this machine is going into a museum.
@ColinChristie1
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Awesome! I worked for Signetics in the early ‘80s at the Philips Research Labs Sunnyvale / Advanced Technology Development (PRLS/ATD) group. Fun to see you using our parts. 😋
@thebyteattic
Жыл бұрын
I worked for Philips Research too, in the 90s!
@ColinChristie1
Жыл бұрын
@@thebyteattic Very cool! We developed the SUBILO-N (SUBnanosecond Isolation by Lateral Oxidation) process in the development wafer fab in Sunnyvale. This was used to produce bipolar ECL devices. I also worked on a then-“Top Secret” project which was the first pilot-line production of CDROMs in Sunnyvale, introduced in 1984.
@raindogred
Жыл бұрын
I was thinking diode when you had to flip the probes on the dmm to get a reading..never seen an IC behave that way though..cool haha
@thebyteattic
Жыл бұрын
As another commenter mentioned, there is also the residual charge inside that chip. It's a level shifter without obvious external capacitors, so there probably is a lot of charge inside, which confuses the multimeter. The latter expects the only charge to be the one it puts out itself.
@jameshearne891
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@@thebyteattic I don't think it's residual charge in the chip, it's because you still have the serial cable connected to the PC and it's power from the serial signals finding paths through the components on the board. You will get similar readings whenever to measure a resistance where there is still a voltage.
@geoffcollins6601
Жыл бұрын
Hi just a small thing RS232is a standard not a protocol. 😮
@thebyteattic
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RS232 is a standard communications protocol. 'Standard' just means something that different parties agree to use in the same form. But there needs to be something to agree on to begin with. In this case, it's a communications protocol, consisting of starting bit, word, parity, stop bit, serialized channel, control flow protocol, defined voltage levels, etc. The communications protocol we call RS323 is the substance of the standard we also call RS232; the communications protocol is the thing standardized.
@geoffcollins6601
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Rs232 is a standard not a protocol. A protocol is an agreed set of instructions between two devices. Wyse VT100 terminal communicates using a protocol using serial data, which could be over an RS232 or RS485 or another serial standard/connection . Other serial protocols include BAKNET, MODBUS, PELCO D, etc.
@thebyteattic
Жыл бұрын
@@geoffcollins6601 You're quite confused. Protocols can have (and virtually always have) a hierarchy of levels, such as in the Internet Protocol Stack. Insisting on this silliness just makes a fool of yourself. circuitdigest.com/article/rs232-serial-communication-protocol-basics-specifications www.electricaltechnology.org/2020/05/rs232-serial-communication-protocol.html www.electronicshub.org/rs232-protocol-basics/ www.codrey.com/embedded-systems/rs232-serial-communication/ Etc. etc. etc.
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