Hi Welcome to a mystery teardown! Thank you very much for our li! Kaminsky for sending this one in I'm he's from Washington in the USA and what it is is a defibrillator analyzer for analyzing the fruit. Politis Go figure. Specialize be the kit. We're like you've seen these arm the defibrillators I've done a teardown I believe I'll link it in down below.

um where you have the test pads like the chest pads where you put them on the sternum and the apex? Don't worry I Can put my hands over here because it's not going to generate a high voltage on this thing. It's designed as a load based tester device. Oh look, check it out. It's got a scope output on it.

It's got Rs-232 serial output. It's powered from a nine volt battery, so I'm not going to do any damage to myself. And it's done for a buy DynaTAC Nevada and made in the USA USA and has pretty recent calibration. - let's check it out.

Awesome! Of course it's an analyzer. It doesn't need to actually generate the the pulses or anything like that. it just analyzes them coming from the actual D of fibrillate er itself. So it's got a real-time scope output which will no doubt scope get it.

So this thing probably costs real serious money because it's a specialized better kit. Anyway, let's do a quick teardown like it'll just have some like sense amplifiers and stuff like that I suspect and I suspect a huge amount of magic in it, but you never know. Let's go there. We go.

Tada very nicely. Ah no. a fair amount of magic all night. Ah the big Of course you need to be dummy resistors Wow the day-old dummy resistors.

Check them out. Of course you need those. Ah what monsters! I've never seen one so big. that is ridiculous of these.

like a custom thing. 25 ohms 1% made in Mexico I Don't want my Mexican viewers. Oh this is Fanta and looks like it's an old design because we've got old school dip roms. by the looks of it.

Let's go further. Well, this is actually a really nice physical design. Look how the apex and the sternum mounts are just like have those are PCB threaded inserts in there and then they're just screwed into the front like that. Absolutely brilliant.

and of course these are binding posts up here as well. Go directly into the PCB Really nice design and as I said like it's just going to be a sense amplify here. Looks like we've got a couple of Sense Op amps over here of course. I Completely forgot about.

You need the big dummy resistors to dump all of the power into this thing? Now we've actually got two in series across the apex and the sternum. so that this one that this one in series here I Can't remember the output voltage of a typical defibrillator, but Wow I mean these are absolute monsters. Look at them and then of course you've got some secondary stuff here. It looks like these are all in a string configuration.

Again, if you have a look here, high voltage. So it's basically just a high voltage differential aid. So it's basically just one huge load across here, which is 50 ohms load right across there. Why 50 ohms? I Don't know.

is that some industry test standard? because it's not for RF reasons, that's for sure. You know the transmission line machen or anything like that and then it looks like it just simply comes out here and all these. you can probably might be able to see the traces under there, but these are basically all in series. I'm not sure why they're alternating between these two different types of resistors here, and that's interesting.

but they're obviously trying to get a high voltage resistor here, which then just drops it straight into there. So like that's it. And then we've just got a differential amplifier and Bob's your uncle Aha. Upon closer inspection, these are in series.

It doesn't like open eight like this one in series with that one in series with that one, it's these regular axial ones in series together. and look. these ones I can't see because the PCB tracers on the bottom, so maybe it's like got some intermixed Joule sense line or something like that. But yeah, it's just these ones here in series by looks of things on the top here.

And as for the circuitry, all we've got here is an LF for for - that's a Joule J FET Op-amp We've got a couple of ICL just the CMOS Op amps over here. What a seven, double six over voltage inverter. Because we've only got a single nine volt rail. so they're obviously generating the negative rail with that puppy and that's basically all she wrote.

and that's pretty much all I Expected this something I didn't notice before. Look a fluke calibration seal. It must have been calibrated at Duff Looks Quelle Lab. Presumably it's not like a fluke product.

So yeah, maybe they have the test facilities to do it. That's probably what your regular cow house probably isn't going to do this. Oh, they might be given the procedure and everything else. I don't know they might be able to do it as a custom job, but yeah, it may be fluke.

Just they have a house that just you know know how to test these things. and I'm impressed by the Sheldon on the test board here. Look, they got a both sides. What is that? It's like an insulating sheet.

but I just haven't seen this like woodgrain finish. So it's really interested in materials. It's not our elephant tied or not elephant hide, elephant tied. It's not that it's like some sort of like a Formica or like you'd get like on a bench top.

Interesting, They are obviously using it for, you know, superb electrical high voltage insulation. It would be chosen for a reason. Let's take a look at it. Way there we go.

Everything socketed on this thing. So they thought about, you know, repair of this thing because they probably make like dozens of these or hundreds tops or something like that as it would not be a high volume product. But yeah, this is really old-school sir. A date code.

yeah, codes in 1990 So this thing is 27 years old Wow and it's your classic microprocessor architecture Ram your two roms so it must be 16-bit they'd be 8-bit each and a process. What do we got? And the Hitoshi fanboys go wild. HT 63 803 or like in the datasheet and we just got a bunch of analog stuff here and looks like of course we need an ADC What is it? Old school stuff? National Semiconductor ADC 1205 classic 12 bit ADC that would be used on a microprocessor based system because it's designed to hook into a microprocessor data bus. and curiously, next to that, we've got an old-school dark Oh 8:30 I'm 8-bit and ducking this thing.

so I thought this is just sense the signals, but it's obviously using that to generate unless it's using it to generate some offset level or something like that. I Don't know, but it might make sense that it's got some building. a self-test or something like that. perhaps actually.

I Just found the I use a manual for this thing on the Fluke website. so I don't know? Do it. Maybe flip did offer it or something like that. Certainly not.

fluke are branded though in the manual or anything or on the device itself. but hi, check this out. I Found this on the Fluke of Biomedical Division page. It's a paper on Human Impedance variability and Defibrillator Test protocol.

y50 own loads are not enough to test Modern defibrillators. Remember the model? what are we looking at is 27 years old, so you know it's really ancient. But yet the Fluke Biomedical Division. There you go.

That's why it had the fluke thing on there would have been tested by the Flute Biomedical. be calibrated by the Flute Biomedical Division. and let's just go through it because this is fascinating stuff. I'll link it in down below.

of course you can read it for yourself, but yeah, blah blah blah. Why we have to do it: Current not energy defibrillate. Successful defibrillation requires enough current to be delivered to the heart muscle during the shock, must transit through the chest thorax and the impedance. It represents Body mass, skin resistance, tissue type, and amount all play a part in the chest thorax impedance presented to the charge delivered by the defibrillator transferee.

Ik word of the day, Transthoracic. if I'm pronouncing it correctly, impedance equals the body's resistance. the current flow. Typically the definition of impedance Human impedance variability has been shown from vary from 25 ohms to 180 ohms.

reference down below. Awesome energy in respect of Impedance is the determining factor to success of defibrillation. So that's why that like 50 ohms just doesn't. A static 50 ohm load doesn't cut the mustard anymore and IH disease.

While I'm getting older, my hands play resistance going up. probably my resistance to is going up, that's for sure. Successful defibrillation requires sufficient current to the heart muscle of Allah Transuranic advance and schematic and formula Brilliant. Look at this.

Um, and there you go. There's a 300 joule at 50 ohm I millisecond Pulse Typically like it does it over 8 milliseconds as I think we've shown in a previous video that's a mono phasic waveform. The typical 2 electrode approach that you get on most defibrillators like if they have you up at a hospital or something they might have you know more. But you said in the movie the Paddles you never see them put them in the right locations.

it's like just a custard. It's Hollywood Anyway, how defibrillators count for human impedance variability? Yes, because they they now do the biphasic waveform and it's supposed to account for all that sort of stuff and I've looked at these in the previous and then you can get the pulse biphasic which is sure good on your Shula obviously named after the person who founded that one. the pulsed biphasic waveform low impedance delivers more current than required exposing patient to potentially harmful high peak currents. average impedance said depends on the on the person, so they've got to knock it back Anyway, There you go.

Our 50 ohm test loads enough to ensure output conditions and Monday defibrillators. Do all of hospital patients have the same impedance? No testing beyond the 50 ohm load is necessary to ensure different. Later there you go. No doubt they have recommended test devices these days.

All there you go. There is an IEC standard. There you go. required to be tested in different resistances.

Today 25 through to 175 own is the modern standard so this one is no good even though it was what life calibrated very recently 2013. Was it? Anyway, it might have been good enough for nice of old gear or something. Brilliant selectable load accessory of course. looks sell a selectable load accessory.

The Impulse 7010 There you go. I'm So I may be flipped by a medical board out this company because they're using the impulse named so. uh, there you go. So interesting.

That's the modern one. There's all the references for those played along at home. Beautiful. Anyway, let's pair it up because the DAC inside this thing does generate some cardiac test waveforms which presumably will come on the scope output.

So let's give it a ball. So if we switch it on here and whoop somewhere, yeah, I don't I've let the latest firmware when I figured out the old EEPROM programmer and the UV Ariza. Somewhat curiously, we go into our perf for performance. so it generates performance waves our performance waveforms and we can do an auto sequence or we can go into manual here and what we don't want to 0 output do we look at that? There we go.

240 beats per minute ECG There you go a 2 Hertz triangle one Killer. it's sign just various test signals from that 8-bit ADC for second pulse 2 seconds square zero. Out there we go. let's do a 240 beats per minute wave.

so I can measure like energy peak energy of the pulses and things like that. and you can test that set up for a hundred point five joules which might be a standard a defibrillator output and it can do auto sequence testing on our various pre-programmed products and things like that. So presumably you can. you know there's a blank one in there as you saw you could do that, but you know, like a whole bunch of stuff specifically related to event like in treat like cardiac terminology I don't know, you'd have to.

you know normal sinus art ways you'd have to go through like the May you're at which I'll link in down below and just to see what this thing's capable of and how you use the external terminals and stuff like that. We're not too interested in the operation this thing, just let's just say it's a comprehensive bit of kit for doing pretty much any testing on a defibrillator. Quite open up the dancing again. We get into it to prove it because I didn't have the like a follow up output to scope like I just like below I could probably cobble one together somehow, but it easier just open it again.

but I don't seem to be getting an output though unfortunately, so this thing might depend. maybe why it was tossed or whatever. um, it may be cactus like the output amp. I think here or metal can package down in there I think the output amp.

so yeah, it's just supposed to be out put it away from and it's not well. I had to go all the way back to the DAC over here and I found a duct test point that I could use and tada there it is. 240 beats per minute. But look at this.

isn't this a crusty way you can see? they do. if you can see the 8-bit Nosov it, let me zoom into that. look at that. oh that's terrible.

Muriel I mean that's not even a bit resolution that's just generating like like how many bits is that? like five? Ridiculous. But hey, it's going to be good enough for a test way from this test. Waveforms designed to test like our monitor outputs and stuff like that. So like you know where cardiac waveform monitors and things like that so we can change that too.

and there's a sign way that's not terrific and even down at 30 beats per minute, we don't get anything better than that. So like that could be like a function of like how fast the process is operating. you know they went IQ We only need something near enough and it's not going quick enough and they just want to output it. But yeah, I there at least got my Big DAC and they couldn't use it.

It's just hilarious but all. Let me test out the factory that have to be field tested if you do these things. Probably some people just buy them and when the day they put them there in situ, wherever it is in the public space or whatever or the office and then once they expire, they might toss them out. or they might get them refurbished and you might use this bit of kit to refurbish and put a new battery on it.

retest them. stuff like that. So obviously our 50 ohm dummy load is a standard that's 95 watt, so that's almost like 190 watts dummy load there. and they just got some high voltage sense lines going off to a differential app and that's and that's pretty much it.

And then they just analyze them with a 12 bit ADC because cardiac waveforms aren't anything you know, particularly high frequency. so you can just use a you know, an old-school 12 bit microprocessor ADC in there operated bugger. all I Don't know whether you'd probably only need like a Kilohertz sampling rate or something like that. Nothing terribly high at all.

So it's a real interesting specialized bit of kit. It probably cost, and you know, a pretty penny, no doubt. So thank you very much. Eli Kaminsky for sending it that one in.

it's really interesting. it still works a problem. you know it's got fairly recent calibration on it and what good is it? It's a dummy low for testing their ECG and for testing defibrillators. So if I ever do another teardown of a defibrillator and I have a working one, then I can might be able to dump it into a load here and see what happens.

But yeah, anyway, it's not like this is only designed for pulse load. Of course it's not. you know, not dissipating 1990 What's continuous? It's just they're designed for pulse load applications. but it's really nicely designed I like that.

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