TSP #74 - Teardown, Repair and Experiments with the Fluke 43B Power Quality Analyzer
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- เผยแพร่เมื่อ 16 ก.ค. 2024
- In this episode Shahriar investigates a Fluke 43B with a broken LCD screen. This unit suffers from the fairly common horizontal lines across the LCD unit. Furthermore, the unit also shows discoloration and other minor damage. Instead of trying to repair the LCD screen, it is fully disassembled and the internal construction is examined. A full teardown of the unit’s analog and digital circuitry is also shown. A replacement LCD screen is purchased from Scopemeter Repair website.
The repaired unit is then used to examine the power quality of a florescent lamp. Power quality, displacement power quality, apparent and real power as well as distortion is examined.
The Signal Path Blog
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Nothing can beat Signal Path on Valentine's Day! I under estimated the amount of popcorn for this episode!
The notorious Fluke hotbar attachment problem!
+EEVblog Yes, I remember your video of the scopemeter when you finally fixed the lines only to find the damn thing had bad scope channels. My hats off to you for your determination to fix that screen, very annoying problem.
+The Signal Path Blog I fixed 3 Scopemeters that had lines on the screen, and it's really surprisingly easy. What worked just fine was just pressing a hot soldering iron across the hot bar attachment slowly, at medium temperature. This fixes most of the lines, the few that are left you can pinpoint with the iron and so far that does the trick fine. I was initially worried about damaging the strip, but apparently it's totally fine. The hotter the iron the better it works. I initially tested it out on a non critical part past the connection to see if it would melt, then go at it. It takes a few minutes and they have been good for quite a while now. If you find one cheap with lines, it's likely a simple fix.
+EEVblog Opel/Vauxhall/Holden cars' trip computer have very similar LCD to driver interconnection which fails as well. :-) Poor design in my opinion.
+epatto Even BMW from the 90's have this problem. I think it's the moisture that eats the connections over time.
+epatto Varitronix 240x64 LCD displays from the late 90s to 2005 had that as well. 100% failure rate after 10 years.
I enjoy short videos as well as the longer ones. The longer ones are quite an investment in time (since I'm not an EE, and I find I need to pause to go and read about what you're saying). It'd be nice to have a variety!
Whilst short videos are very entertaining your talents lie in presenting subjects matter in exquisite detail. There is a broad array of electronics tutorials and magazine shows on TH-cam but rarely do we gain insight into such exotic equipment
Just a short note, I'm sure your very busy as are many of us (your fans). I especially liked this short video. I wouldn't mind more short videos with an occasional (your usual amazing) in depth detailed look at a wonderful new (or old) product review. My "absolute favorites" by far are the ebay purchases of a broken instrument that you repair.
Please do videos more frequently. It's a pleasure watching them!
Such a grand instrument to own, hats off for saving it.
I vote for more short videos! (and long ones)
Short or long, all your content is superb! Thank you.
Yes, please share more short (and long) video's. You (and the team) are an inspiration.
likely it's too late for suggestions, but watching the effect of a VFD on the power line would be interesting when delivered with your insight. I have to deal with those often and I would benefit from a better understanding of the effect. In addition, determining the cost benefit ratio of installing a VFD vs a soft start vs across the line start of centrifugal pumps would be very useful. You have a great style with clear explanations.
Thanks for the interesting video. As a relative novice, I hadn't thought about domestic power supplies that much. This video had contributed to my knowledge, cheers.
Thumbs up for little videos. Best is somewhere in between, as usual. Meaning it's beneficial to have both types of videos, short ones about "work-in-progress & lab tips" and long instructional ones with dedicated experiments and theory coverage. Also I'd expect it would be easier to grasp the content for beginners in RF/AC stuff (like myself!) to have these little videos about one simple thing, rather than having only big complex videos, which I often had to watch few times, and do lot of RTFM in between for concepts I had missed.
So, more interaction, that's all I'd want. ;)
I'm up for a mix of short and long videos, they've all been very interesting and informative to date.
Very nice instrument! I was surprised by the level of detail it displays on the harmonic content of the waveform. I didn't expect that in a handheld meter of this type.
Great video as always.... I believe the screen is repaired using a replacement elastomeric strip with some plastic pieces to offset the connection.... taped to prevent disassembly/tampering.
Keep up the excellent videos!!! .... PhD EE you guys ROCK!
I enjoy this type of video, as well as your epic 1-hour productions. Thanks for taking the time to post this.
I love the idea of more shorter videos... as long as you don't burn out, and produce fewer of your long-form content. :)
Great video. I liked the demonstration at the end to show how it works and a little bit about the power factor etc... If you did a more detailed video on this topic I would definitely watch it.
Yes please do and I'm sure ppl will like it even more..Few shorter ones are also nice and then some long one..nice combination.
Good, informative video, especially for people who always ask why UPS devices are rated, for example, 800VA and not 550W.
Thanks for a very nice video. Even though it was shorter than usual, it still contained a lot of interesting information. I very much hope there will be more to come.
Dang another tool to shop for .
You are enabling my TOOL-JONES ;)
This was good, would not mind seeing more of this format
Yes, i like this video. A big thumbs up 👍🏻
by all means, please continue to make the short videos.... great work
Play video, congratulations. Thank you very much for posting !!!
Long or short video, your video always something that interest me. Thanks. Length is not so much a problem for youtube video as one cannot pause and continue as needed. Pace is something that may matter. The pace for this one is fine with me.
When you find a business that specializes on repairing these scope/meter screens you know you have a whole bunch of them going bad.. Fluke should at least offer cheaper replacements but as we all know it's way more advantageous for them if you just buy a new instrument.
+VoltLog Fluke is not manufacturing the display. They are custom made by a large LCD-manufacturing company. Fluke cannot do anything about a bad product from a subcontractor.
+zaprodk Fluke sells a product, Fluke should take responsibility for a fault in its product by at least providing affordable replacement parts.
+zaprodk
Change supplier.
definitely worth a thumbs up :)
I suggest you make shorter videos as tips for the experts or longer ones for the beginners. this is a good example of learning by principle when it comes to how these kind of meters work but you can make another one about power factors, current & voltage lead/lag with intuitive experiments for beginners.
I certainly enjoyed the shorter video, so I would like to see more of these please :)
I really like these kinds of videos, and more content is always better haha
I have had these "unusual" wiggly lines in displays as well and thought they were production contamination like microbes eating their way into the crystals, because it looked so similar to some old CD's where microbes really ate away the aluminium. So I took it to the manufacturer and they told me I was wrong. They said, this is nothing more than the crystals dissapearing through a tiny micro rupture of the glass. It's kinda hard to believe since I never found any residue near those spots. However, that's what I have been told.
I don't feel like it matters, you're videos are always good - long or short.
LOVE YOUR VIDS
Although you mention that the clamp is good from 1 amp to 500 amps, it's very common when using a clamp-on ammeter keep on hand a simple coil with 10 turns, and maybe even a second coil with 50 turns of some small wire, perhaps #24.
So obviously it can measure 0.1 amp with the ten turn coil.
All good.
Good Video
I understand how that clamp-on probe measures current, but how does it measure voltage?
short but nice
I have old HP48SX (series A) gfx calculator that developed similar swirly tracks to LCD screen. I have no idea what had happened, but it's really old B&W screen too, so perhaps it has similar tech in it?
i like the short videos as well. can you explain what power factor means?
Was the intro animation remade?
I didnt had much time for your videos lately, but I remember the intro animation looked like it was played from a VHS player, now its all clean and digital! :)
How does your current clamp attach to the 43B? Isn't your 80i-500s current clamp terminated with BNC? But I don't see a BNC socket at the top of the 43B. How do you get them to mate?
Also, can you use a current transformer instead... by terminating it with a resistor? For example, Fluke makes clamp transformers with 1ma per amp output. Is it valid to bridge the conductors with a one ohm resistor to simulate a 1mv/amp "official" clamp meant for the 43B? Thanks.
👍👍
Which was the video of scope meter repair he mentions at 8:10 minute ?
LCD display Fluke 43B = $ dólares??
Buenas amigo tienes una pantalla para la venta del fluke 43b la mia le salio una mancha en el vidrio y no se ve nada
The damage you showed on the LCD panel is pressure damage. I've had LCD's sitting for a long time with stress on the glass, and the same happens. What happens inside with the liquid crystal liquid i do not know, though.
+zaprodk And these look to me like handwriting. Someone may have written to a peace of paper that was on top of the screen.
I can assure you that it's not handwriting on a /piece/ pf paper that made that damage. I've seen several displays with this damage, even one i damaged myself by having something heavy ontop for a prolonged period, and they all look the same. It's the crystalline structure of the liquid crystals that looks like that - not handwriting.
15:00
Root Mean Square RMS NOT AVERAGE ?
average is zero?
+Bartosz Marciniak Yes, it is always the RMS value.
Hi.my fluke 123 having issue and nobody can help me out maybe here some one have some suggestions.so here is the problem.my fluke 123 is only click sound in speaker section no as loud but u can hear click.just totally dead.when button pressed power on click disappear until released.tryed with battery without battery.power supply genuine 19v something on output I think.any one any suggestions thanks in advance.
I had a similar issue for my F scope M123 - But not sure the same , For me the problem started when I tried to repair the battery connector which had corroded wire side (greenish) , looks like there was a short ckt and I can only here click sound after it - no display .After some checks I found the charge current (Shunt) resistors (3 x1R) are open.I got the resistors from shop and replaced ,Its OK after.Easy check for this type of issue with out opening up the meter is to test the resistance between battery connector -ive (top middle when display side down) and the middle pin (-ive)at the inside of power adaptor socket - Its should be around 0.3-0.4R.offcource remove the battery and Ac adaptor.
Other issue could be display backlight supply failure.You can check it with service manual.
I faced it long back with no display and a hissing noise (power supply loading like).But I was still able to connect the scope meter with Laptop though it was not able to measure any.So it means main powersupply OK .
I had to send it to a repair center and they quoted hefty for repair.Finally up on my relentless perusal they agreed to replace the mother board with a used one for 1/3rd price.When I received I checked - whola they put a Fluke 125 mother board and I have all power and harmonic measurements !!!. Actually the hardware is the same - but public cannot flash a Fluke 125 firmware on 123 by available flashing tool.Even I tried to update the received one with a latest 125 Fw , but it declined the offer ,may be because I put the Fluke 123 serial number .