The BM869s, 14KV or Bust
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- Опубликовано: 26 авг 2024
- It's had it's rotary switch cycled 50,000 times, it's swam with the fishes and it has been exposed to transient levels that damaged it's input. Can it survive a 14,000 volt transient with a $1.00 budget and no PCB changes? Watch and find out.
The data for the meters I have tested may be found here: docs.google.co...
Answers to Frequently Asked Questions may be found here: docs.google.co...
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Wow just a matter of changing two transistors brilliant work again. thanks Joe you put so much hard work into your videos.
Thanks for watching.
Great work Joe. I was riveted to my seat. Love your style and your videos.
lol
I bought the Brymen BM869S from TME. I am extremely happy with the shipping time. I am almost positive that I ordered it Tuesday and today is Friday and it's HERE!!! I wish I would have known about your video's a few years ago! Keep up the amazing work!!!
Thanks and enjoy your new meter. I use mine frequently and even after the abuse I put them through, they both continue to perform very well.
Great result! Success of engineering, careful and systematic work. And also reveals the hidden margin of the Brymen design. Love this.
Well done! That was such a simple mod with excellent results. As always, thanks for your videos!
Thanks. I'm glad you enjoyed it. It's always good to see the changes put to the test.
Whilst trying the 14k transients, I hit a heartrate of 130bpm and an anal sphincter scale of 9.6 expecting something to blow up in that multimeter! LOL
Imagine sitting next to them.
In these parts that 9.6 figure would be referred to as ones 'pucker factor'. Guess the terminology is regional... :)
Thank you Joe for sharing your extensive knowledge
I just bought BM869s. Tnx Joe.
you certainly play with some high voltages! Glad you hit your goal of 14kv! Once again these meters are great the way they are from factory but I find it interesting how you improve on them.
I was wondering if something else would give out but there were no signs of any problems. If something starts to breakdown, I will normally see it on the scope or hear it. Looks like they did a fine job with the layout.
What replacement transistors did you use? What's the difference in cost?
NICE VIDEO, THANKS..... i bought BM869s in TME, Poland last 2016 and still my favorite all around meter
Love your videos Joe. Geez, I watch more of your videos and and a few other youtubers who do similar videos than I watch anything on TV. After seeing your praise of the Brymen 869S in many videos I ordered one today. Found myself testing a power amp last night where I could have used some the 869s features. I have the BM 235 and love that. This should be the last handheld meter I'll ever need. I'm somewhat new to the electronics world but learn a ton from guys like you, Dave Jones and Paul Carlson. I spent 30 years in the machining trade as a jouneyman toolmaker and CNC programmer but always loved repairing and modding my own old tube guitar amps and accessories. Thankfully my math skills from machining translate pretty well in this world. Keep the great videos coming! always exciting to see a new one from you. ;-)
I am not much of a TV person myself. Anymore, it's rare I even watch the news. I've pretty much given up on the major networks.
That BM235 is one tough nut to crack. I hit it with some of the highest transients and saw no problems. The 869s was not as robust but still far better than the majority of the meters I have looked at. Enjoy your new hobby and the new meter.
I agree about TV. Anything I watch now days is entertaining and educational like your videos. Reading books on electronics, some of the old books from the 40's and 50's are great for tube gear. A lot of hands on repairs and builds of tube gear and analog power amps I spend time on. I wish I would have gotten into this stuff young for my career as it was always interesting to me. Your engineering skills are amazing. What is your background into it if I might ask?? Thanks again for the cool videos! can't wait for the next.
Great video Joe. Love your work, although some of it way above my station.
Electronics is fun. Stick with it.
Another awesome video Joe! Thanks a million!
Wow!!!
Thanks for sharing 😀👍
No problem. Glad you enjoyed it.
+4Kv improvement on a already quality meter.
Reminds me of "Deconstruction of Fallen Heroes". Damn, is the the meter MFG's fault and/or Dave's fault? Did Dave get so much invested in this meter that he had to put his name on it, faults and all? I really think he designed an Engineer's tool, and it is probably excellent for that, or at least specific jobs. I don't think it is good for day to day technical use. I for one, find it difficult to to use it for trouble-shooting in resistance mode. Yes, it is much better in manual resistance mode. The problem is, I find it difficult to tell what manual resistance range I am in when I push the RANGE button. That said, it is an "Okay" meter, but so is the free Harbor Freight CEN-TECH. Laugh at those if you want, but for basic work or trouble-shooting, they do work and are accurate enough for trouble-shooting. I wanted a super portable DVM; which I did not get with the 121GW. I should have bought the Agilent or Fluke. Sure more money, but those are use them meters, not engineering or experimentation projects. Sad.
Can you show us how you made the Devil Lady generator?
great job, what transistors did you use for the modification??
He will never tell you, has his own quirky reasons for it.
Sorry for late reply :-) Just bought this meter and am reading up on it. My Maplin White Gold (which is well protected for it's age) got called an antique last week :-( I change it's leads every 10 years whether they need it or not :-) It has helped me commission probably 500 VSDs, servo and DC drives plus umpteen soft starts, star-deltas, Korndorfer and conventional motor starters. It's been used for phasing 12 pulse 11KV transformers between secondaries and in the DC trip circuits. It was across a direct shunt when a 2500A DC breaker popped on a particularly nasty series wound DC motor. It suffered no damage despite the huge inductive arc splatter coming out of the arc chute and who knows what EMC and circulating currents. Various 240 and 480VDC slate bed relay controls also tested with it: Inductive coils, lots of volts, thin wires and bad earths....
The problem is if someone asks, how old it is, when was it last calibrated and (crucially/comically) where did you buy it, it might not stand up in court Your Honour.
I can understand not telling the transistor part. Obviously a knowledgeable source saying explicitly "do this to improve your meter's safety" is a) putting themselves at risk and b) does not invite friends from the multi-meter manufacturer.
I'm not knowledgeable and have no RUclips status, so my guesses would be: Y1 or SS8050 is quite common. Almost any modern NPN SOT23 BJT would probably out-perform the 2N2222. Several high current fast switching types now exist such as FMMT 620. This is 1.5A, quite high breakdown voltage, high gain and fast to turn on. That would have been in a TO220 package not many years ago, not the grain of black pudding rice it fits in now!
I just noticed the transistors in the meter on a high res photo from someone else show VLR on top. This is a 2SC5866 I think. It is a fast 2A device in a slightly oversize SOT23 package and is much more robust than the 2N2222 mentioned. An upgrade since this video?
It means the updated BM869 can be hooked to many electrical fences and survive.
We would have to take your word for it. If you decide to make a video showing it, please post the link.
@@joesmith-je3tq Well, I would probably have to update my 869 first with the mods. It is reassuring to pick it up and dig into HV cabinets even stock.
@@Ruudwardt It's a pretty robust meter as is. I'm sure I've caused more than one kid with a MOT to damage their meter after seeing me run them up so high. lol.
I wonder about one thing within this multimeter,. It is dual thermocouple capable, but what is channel to channel isolation between the 2 thermocouples. (max standing voltage)
Isolation? If you really need isolation, you will need for example two handheld meters. The two K-type inputs - inputs are on the COM and A jacks which are connected by a large HRC fuse and a shunt.
Face reveal at 1M subs?!
That's a long wait....
Which type of transistors are bthe new?
I don't normally disclose such details to discourage modifying a safety device.
@@joesmith-je3tq OK- I asked Just for curiosity...
Hi Joe, here's something I'd be interested in seeing, a comparison tear down and your observation. When looking into getting a Brymen 869S I realized I'd have to go outside the US to get it. While looking I found the Greenlee DM830A on Amazon. On the outside it looks to be the Brymen 869S re-branded with the same features but it is only a 10,000 count display. Curious to see if the circuit is the same with different firmware or it is something quite a bit different. Price is $250 US on Amazon. www.greenlee.com/products/DMM%2540c-TRMS-AC%2540PlusDC%2540cDUALTEMP(DM%2540d830A).html?product_id=17755
Using Google to do a quick search of "DM830A and Brymen" shows its a BM829s. Greenlee has a fairly big markup with from what I see, no added value. The BM829s may be found on Brymen's site at: www.brymen.com/PD02BM820s_829s.html
joe smith That explains it. I thought for the price of the Greenlee at $250+ it would be in the 869s category. I wish Brymen would distribute in the US. Had to go through TME to order my 869. I guess if Greenlee has a re-branded 869 it will be $600+. Amazing markups they put on these for just adding their name.
TME is where I bought mine. I had no problems with them. Greenlee charge that much because it has their custom green boot.
Wow! TME sells the BM829 for $179 US. The Greenlee DM830 I've seen for over $350 on Ebay from some distributors. Folks really need to research prices on stuff to not get hosed. TME had the best price I could find on the BM869.
I think TME is pretty much where everyone I post has bought their's from.
Would have been better if you had edited out functional tests except for last one.
I've thought about editing all the details out and maybe just giving a 10 second pass/fail. Hello, 14KV test passed. Later.