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- เผยแพร่เมื่อ 3 ต.ค. 2024
- Inside the Voltech PM300 3 Phase Power Analyser.
The Voltech power analyser division was sold to Tektronix in March 2013:
www.voltech.com...
www.tek.com/vol...
www.voltech.com/
Datasheets:
www.westek.com....
www.analog.com/...
www.avagotech.c...
www.ti.com/lit/...
Hi res teardown photos: www.eevblog.com...
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Big old shout to Dave! Nice work mate.
Thanks for the vids:)
Photonicinduction and eevblog = best TH-cam channels ever.
***** why dont u check out my channel i just started
awesome bit of kit!. I am pretty sure I have or had an LCD the same as what is in the Power Analyzer, it came out of a print server PC that lived in the bottom of a very old color A3 copier. pretty standard LCD module.
.22J 6kV -> 220n 6kV Just a tip, I know it's hard to comment when filming
Why would 11 people give this the 'thumbs down', what did they expect to see when they read the title, boobs, kittens on LSD or maybe they thought "Voltech PM300 Power Analyzer Teardown" meant 'how to get free food from McDonalds' ?
It's a simple and accurate title from EEVBlog, a straightforward video showing exactly what the title describes and a fairly comprehensive commentary going over the Voltech PM300 Power Analyzer in plenty of detail, all in good focus with good lighting and even explaining the possible reasons for design and choice of components.
What else would it be ? What else would anyone expect ?
I'm completely baffled !
Perhaps they were Yu-gi-oh fans and were hoping a teardown of Super-Electromagnetic Voltech Dragon :)
There is always someone who is responsible of unliking.. :)
There seems to be three reason for thumbs downing:
1) Those that genuinely didn't like the video on it's own merits for some reason - fair enough.
2) The ones who didn't like that I uploaded a video that is not what they wanted. i.e. they usually aren't criticising the video itself, but the fact that I didn't make a video to suit their taste. They usually deem this video to be a waste of their time, and is not the reason they subscribed - blah, blah.
3) The serial haters.
I have other reasons for thumbing down YT vids, first is that it's inaccurately described or misleading in order to get views. Second is that it is very distasteful or shows a distasteful action, this includes foul language. Third low quality content, commentary or just generally poorly made, no matter how good the pixel rate is. Fourth, showing illegal or shocking activity and fifth is just to avoid similar video's coming up in my "What To Watch" list on YT GB (I thumb down more vids on this last reason than all the others combined).
Ian Clarke Yes, I lump all of those into category #1
Those green caps made me nostalgic. I grew up seeing those a lot! Nice to see some good old boys' design... thing's gotta be near bulletproof with all those TTLs.
12:00 there's a little date code 0045 on it, for year 2000 week 45
The first time I saw a 3-phase power analyzer it was back in 1995...it was on a big cart and had a PDP-11 frontend.
Excellent vid Dave! Glad to see ya back in action. You mentioned having a lack of time for videos on The Amp Hour. Understandable. Glad to see this tear down posted.
There is no question about enjoyment to watch your video and in fact I am watching for the 3rd time same video. Please try to upload your new video soon. Cant wait any longer and if possible increase the frequency a bit too.
having a centronics printer port in 2002 seems baffling, sure you could still get them but they were well on their way out
I'm always excited to see a new eevblog video!
0:29 the work bench is already cluttered as fuck XD
No "hi" this time? Crazy circuit board design, don't believe I have seen a conglomeration like that one before. It would not be fun to troubleshoot without adding extensions to everything.
damn that design looks 30 years old, you could probably do it three or four parts now
Nice T-shirt!! Want one!
I'd like to see you demonstrate this unit.
Dave, I'd love to buy that one off you! I could really use it daily for my electrical work. Would be far more superior then my insulation meter!
No chance, I'm keeping this one!
for servicing you can get card edge extension cables though the design is not very good...
Maybe there is two transformers to take isolation to specs needed - coil to coil arc over would be messy. Otherwise quite standard 5V logic chips there. Keep up the good work.
Dave, the PM100 uses a smaller display. I'd bet the PM300 gets a larger display and the interface module is a bodge at the design level.
Yep, that's the case. PM100 uses the smaller screen and connector.
Jesus, that design feels more 1983 than 2003.
Two questions... I'm just a hobbiest but:
1) Do crystals really actually resonate and disconnect? i had no idea!
2) The current shunt - does that shunt current by means of field effects?
Any answers welcome - I figure a lot of viewers just might know more than I do.
Cheers
1) Most metals will work-harden, fatigue and ultimately fail if repeatedly flexed back and forth. He's not saying anything special about crystals in particular, but the fact that it's reasonably heavy and just free to wiggle means that the leads could theoretically fatigue and fail if bumped a lot. (Or, if a nearby fan is putting out vibration at the resonant frequency of the crystal's wobble [5-50Hz, nothing at all to do with the MHz frequency of the crystal itself])
2. No, it's just a resistor.
I think Dave was refering to more of a mechanical weakness. Any free standing component such as a crystal, regulator and so on can be subject to vibration which can cause loose solder joints. A current shunt can be a wire, metal sheet, resistor and etc. with a known resistance which allows a device to manage and detect the amount of current flow that is occurring. For example, a .1 Ohm resistor with current flowing through it will drop voltage according to Ohms Law. You can easily measure this voltage drop and get the amount of current flowing through it.
Not when standing, but might in transport..
I'm talking about vibration during transportation. Wheel a product like this around on a test trolly on a hard production floor for a month and you'll see what I mean. Any free-standing parts like this with flimsy leads can vibrate lose given the right conditions.
Face palm - Yah, that makes perfect sense. Thanks Dave - Love your videos. :P
This is the third time I've randomly checked your channel and had a chance for a first comment haha. So this time, I'll take it! XD
Subscribe FFS! ;)
Damn, that deign was somewhat meh'ish. Ohwell, if it works who cares!
1. Why, oh why, did they use crappy "NoVer" capacitors!?!?!?"
2. Just one little 1A regulator for the power supply? That regulator must be running near it's max ratings!!!
I hope Danaher didn't pay a lot for the rights to this!
They bought the newer technology designs of course.
So how do they get that 250 KHz bandwidth?
just over-clock them and connect in parallel with other ADC with shifted clock (for non-simultaneously latch) ? no?
You obviously don't do much work on consumer products Dave, funny how you opened the thing! A lot of VHS decks, CD players, set top boxes, etc. used this type of box, you take out 4 screws on the bottom and pull a bit on BOTH sides at the same time (not just from one side lol) and it comes right out.
Great video, I used this type of analyzer before but never bothered to take a look inside. I still kind of like this type of through hole construction!
I enjoyed your video and lecture of this voltech power analyser. Thank you
Seen that type of case before, you have to spring both sides out at the same time, also looks like that top panel hinges on 2 screws (that you removed)
I would bet for testing they have a jumper ribbon between the top board and interface ;)
Good video Dave, pretty basic design. Does not seem to justify the cost of these buggers. I have been looking into power analysers and they are quite expensive even for a single phase!
Nice video, thanx Dave, for showing us what´s inside. :)
got to love old tech
with a 8-bit ADC, isn't the floating point part of the reading displayed by the meter simply in the noise/error range?
I guess the floating point is probably an artifact of the rms calculation, but if you're looking at peak to peak, there's not way you could read more than 3 digits
I love your video's,Dave!
:-)
Warranty void sticker lol
Did you put "Warranty void IF NOT Removed' stickers on your uCurrent boards? ;)
Wow that looks like something you could implement with a PIC micro-controller or 2 and some op-amps. Wow how technology has moved on. (Mind you if you gonna pay several hundred pounds for something with that component count you'll feel you got your monies worth.)
I've been building my own little single-phase power analyser, so was interested to watch this video. My analyser uses a 12-bit converter with 100kHz bandwidth!
I'm sure I'm going to screw something up (forget about some source of non-linearity, not deal with above-nyquist frequencies properly, suffer from interference from my MCU clock, suffer from interference from the iCoupler devices I'm using, all the other things that I don't know from not having 50 years of experience), but it's intriguing to think that my analyser is, hypothetically theoretically maybe better than this unit!
TheHue's SciTech Thanks to the work of the micro controller engineers, a lot of the work is done for us with a multitude of peripheral devices and features built in . But with most products today, the complexity and a clever solutions seem to be in the firmware, running on simpler but well designed hardware(hopefully). I have a lot of respect for the engineers that make the products we use everyday and take for granted when there simple to operate and work well.
Wondering what South African power would look like through that thing.........When we actually have power that is!!
Design by committee.
6:47 wow that is so incredibly tidy..
Same here, I was going to sleep, now watching this... and one of the first to comment, doesn't happen too often ;)
wow, ancient, it's like from the 60s
Why the hell they copied same analog interface design on different boards, one twin, one with MCU. I would design one analog interface board, and use it 3 times with one MCU board..
17:16 EH, Avago, you mug!
Du du du du banana bus du du du du banana bus
Whats up with your mic in this video?
Nothing, why?
Whats up with your speakers? :D
Can you say what it is 15:49?
15:59 "Two-stage transformer"
TheHue's SciTech
Thank you very much :)