PRO TIP: Using a 6.5 Digit Multimeter for finding Shorts
HTML-код
- Опубликовано: 17 сен 2024
- Extract from the April 1st Live show, using a 6.5 digit multimeter to find shorts on a PCB.
If you find my videos useful you may consider supporting the EEVblog on Patreon: / eevblog
Web Site: www.eevblog.com
Main Channel: / eevblog
EEVdiscover: / eevdiscover
AliExpress Affiliate: s.click.aliexpr...
Buy anything through that link and Dave gets a commission at no cost to you.
T-Shirts: teespring.com/s...
#ElectronicsCreators #PCB #Multimeter
I usually find it a lot quicker to check an amp or two through the circuit & use a thermal camera
Show off.
Thermal cameras are a godsend for finding damaged components and dodgy soldering.
@@weeeeehhhhh but still silly expensive.
@@dogwalker666 blown to short mosfets are the best: if you put enough power through the board, they desolder themselves (and I wish I was joking)
@@pjakobs yeah I used to repair motor speed controllers, The Semipak transistor modules used to make quite a mess when they failed,
Yes. The method you describe requires patience and exactness. Or, you could just hook a 5 volt (typical TTL voltage of that era) power supply across the short and blast it away, then add wires to the board to bridge the blown out land pattern(s).
Sounds plausible but this is the April 1st so never know what to believe to...
I'm always learning new stuff on this channel. I have a 3.5 digit Fluke, but it can be pretty hard to tell a 10k resistor from a dead short with such limited precision. Time to upgrade.
You literally described a huge part of my first job in 1990. Verbatim!
Years ago I was working at a company where I needed to track down shorts on a board. The PCB fab house went overboard on tinning the board and it resulted in a lot of shorts hidden underneath the soldermask. I was able to find them using a handheld type Fluke meter (with a 2,000 count?) that had an ohms scale that read down to .01 of an ohm.
You poor bastard! I had a 6.75 digit meter which cut the time to find the fault significantly.
Well... actually it was two 3.375 digit meters in series, but it was great!
Reminds me of Bob Pease's circuit using a VCO to give audio feedback for resistance for the same purpose.
Inductive-pickup short-circuit current path tracing has the advantage of not needing access to the voltage-probing contact points that may not be accessible (on inner layers or under components). I still plan to send you one of my engineering prototype ShortSniffers to add to your short-circuit locating toolbox. I hope to get around to it within a couple of months (life is a series of distractions).
Wow that website looks ancient. If I didn't notice the "3 weeks ago" timestamp on your comment I would have assumed the company was long dead
@@NavinF Yes, the ShortSniffer is still alive, and some of the content is from the '90s, but the majority of electrons still flow through the path of least resistance. Contact me if you have suggestions to help the website communicate this principle. Thanks, Carl.
You can do a decent job with a 5.5 digit meter for those that can't drop the coin on a 6.5 digit meter. Even an old Fluke 8012A, with it's excellent low ohms range, can do a decent job for about $50 these days.
A short tester with a tone that varies in frequency based on resistance is faster because you don't have to keep looking up at the meter.
There was a circuit published long ago in an Electronic Hobby magazine.
May have the article around still...
Short work of finding Shorts.
Please don't be short with me, I am also Old School
and love shortcuts...
Are there less expensive 6.5 digit meters that are worthwhile for hobby use? Seems there are decent 4.5 digit portable meters, but beyond that it seems nothing in the portable space so bench top it is. The SIGLENT SDM3065X seems nice and at $750 is more affordable than some, but...
In the early 80's I used a current limited power supply and hunted around with a millivolt meter for lowest voltage.
Still a good way to find which one of the 200 tantalum bypass capacitors on an 1980s vintage computer board has actually shorted.
usually when I can't find shorts I wear pants
In 1973 Nixies used to rule the digital world! No more RMS until Fluke came with their Hart resistor. Salora Television (Later got swallowed by Nokia) developed their Cyclops power supply with a faulty reading nixie meter. Their chief engineer and me had endless arguments as he refused me to check his claims on a traditional analog meter. Anybody out here who remembers their Cyclops let alone even repaired one? (Salora Playmaster TV sold also under the Nokia name)
I used my Keithley 2000 series multimeter to find a short zener diode on a PCB in a massage chair recently:
ruclips.net/video/Si73Nllozis/видео.html
However now I would use my new thermal imaging camera.
LOL. Nice April fools! :D
Can you not just use the tab on RUclips's home page?
Thorn Consumer Electronics 9000 series CTV around 1975. ( Branded Ferguson amongst other makes for retail and rental)
Yes, amazing how short this long one is.
A improvised Kelvin probe with a CC source is cheaper for us the unwashed masses without money for a six digit multimeter or a thermal camera 😅
And those pesky tantalum capacitors!
Ha! A good one.
can you link to the original video, I can't find it anywhere
ruclips.net/video/05JqEI6ZHJc/видео.html
I have an Advantest R6552 5.5 digits meter laying around here. Could this work too?
Very likely as I can do it on my handheld bk persision 2712 just barely.
Likely, try it wih a piece of copper clad board.
🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡🐠🐟🐡