It's a melting point meter... www.mrclab.com/data/products/INE-WRR_OPR.pdf quote "According to definition of physical chemistry, the melting point of a substance means the temperature at which the substance changes from solid state to liquid state. In the fields of organic chemistry, the measurement of melting point is a basic means of recognizing the nature of substance, and is also one of the important methods of measuring purity. So the melting point meter occupies an important place in chemical industry and medicine researches. Also, the melting point meter is a kind of necessary instrument in the production of medicines, perfumes, dyestuff and other organic crystal substances. "
Melting point measurements are the bane of every Chemistry, Organic Chemistry student's life....usually in a simpler, less accurate, suitable-for-university-labratory version --- called the MelTemp. Horrible, inaccurate device that caused many points to be lost on lab reports for many students.
@@apl175 I've used the meltemp hundreds of times and I've never had issue with them. Any professor that takes of points for impurity is a worthless professor. Those students have a couple hours to do a synthesis that they've never done before, using instruments they've never used before, and expecting a perfect result is unrealistic. I never had a professor take off points for an impure product.
Knew exactly what it was as soon as I saw 3:17, and of course someone beat me to it. Anyone who has used a Mel-Temp in Organic knows what it is! So this is what one looks like that doesn't look like a piece of shit. The counter (clearly not a control) on the front makes a bit more sense too, while you're watching it, you click up until it melts, and then you've got the exact temp. Way classier than using a shit glass thermometer with loads of error and lag, all heated by a stupid little bulb.
The transformer is "R-Core" and probably was chosen for max noise rejection and low flux field. Basically, R-cores have offer less capacitive coupling between the primary and secondary, so less noise gets passed. R-core and toroidal have better performance than standard E/I core. The 2 windings (on the tubular plastic formers) can be counter-wound so they "kind-of" act like a common mode choke. They are less expensive than Toroidals. Quite common in medical and scientific equipment, as well as high-end audio.
I thought the main advantage of an R-Core was that they had some of the properties of a toroidal but were easier to manufacture as they can wind the bobbins separately then marry them together using the laminated core, in a (king of) third winding process. Was considering this type of transformer in a future project... Cheers,
@@EngineeringVignettes - the bobbin are wound ON the core, not separately (The core is solid, not gaps). The advantage is that the bobbin sit in a straight part of lamination, so they can be spun "in-situ" in neatly packed parallel windings, and that winding can occur directly off the main wire spool. A Toroidal requires a more complicated process to wind everything inside the "donut hole" and the windings get packed too tight inside compared to more spaced out on the perimeter.
Now I know what to call them. Thanks. I've pulled a couple of these out of junked all-in-one PA systems for auditoriums/small venues. Went for the pots/hardware, the nice transformers were a bonus.
@@AntonyTCurtis Not in this case, and not just for a heatng element. A research-grade instrument has thermal control for the entire interior, because the electronics are affected by temperature to a great enough extent that it has to be accounted for and/or controlled to prevent it disturbing the readings. Electronic noise control is important for sensitive detectors of all kinds, in this case, the temperature sensors need to have the best quality power available for a device that's already going to be absurdly expensive (from the layman's viewpoint, but not from the researcher's viewpoint). These instruments are also not really worth redesigning as long as the parts remain available because of the low volume. While this one was built in 1999, and apparently only the 47th of this model built, the electronics design might easily go back 10 to 20 years before that.
To measure the melting point of a solid powdered sample, you take this thin almost needle like glass vial, and poke it into a mound of sample, then tap it to have the small amount of powder that entered to the sealed bottom of the vial. This is then placed in the oil bath mixer, and you increase the temperature until you observe it liquify. That's how you get the melting point.
The TLDR The instrument uses a U shaped tube as the oil bath. A thread driver makes the silicone oil into flow circulatory. The platinum resistor injected in the oil bath near the bottom of capillary detects the temperature of the bath. This temperature value detected is displayed on the digital V meter after nonlinearly correcting and voltage amplifying. The oil bath temperature is controlled by a electronic circuit. The “start temperature” can be entered using the button. In other hand, this digital value is converted into analog value and sent to the adjuster with the corrected temperature value. The heating and cooling of bath is by the help of the electronic heating block and the cooling fan. When the samples is being observed through the magnifier, press the “initial melting point” key to display and store the value, when the samples are completely melting, the samples become completely transparent, press the “final melting point” key to display and store the value.
You are supposed to have oil in it to create an oil bath, that's why the temp overshoots so drastically in air, the sample goes in inside a needle like glass vial through the super small hole on top beside the fan and stirrer motor (little silver cap with hole)
And I'm pretty sure the bottom of the sample tube rests on the little shelf of the black plastic block . The sample is strongly lit, and the black background makes it easier to spot when the sample melts.
The oil bath oil for temperature homogeneity is rarely if ever changed, as the solid powder sample never touches it, unless your glass vial breaks that is...
Dave, c'mon... Those 10n capacitors + resistors is just debounce circuit for buttons. Can't believe you didn't se that. And that spring isn't a heater, heater is wound around stirrer axleinside of tube. Spring is just for holding the glass tube.
@@ableite This is a simple single take 2nd channel video, I'm not doing much stopping and thinking and analysing. Sometimes I miss stuff that's obvious because I'm busy thinking of the next thing to say. Try it some time.
@@EEVblog2 I did wonder why you missed obvious stuff sometimes. This explains it. You do tend to bounce around like a rubber ball though! Maybe slow down and take the BigClive or even John Ward approach? I still wonder how you get through these videos in one breath! :)
Love these random teardowns. We get to see stuff we wouldn't normally, that can sometimes lead to some interesting research and learning. Please keep these up.
I so like your second channel Dave, you do not know what you will see next. And this is something I find higly interesting been a follower of your channels for years, your technical skills are superb, but I also like your humor! Keep up the great work Dave :)
That transformer core is literally a coil. The varying width strip is wrapped around a form. The really cool part is how the coils were made. The plastic spool halves were snapped around the core. Then a winder would spin the spools while the wire was fed in producing the primary and secondary windings in place. Makes for an efficient transformer that is almost a toroid but a hell of a lot easier to produce.
Yep totally agree and yeah I am certain things like that before Salvage repurpose reuse and if I see something weird that I know it's going to have lots of goodies inside oh yeah. By the way old bug zappers make great high voltage power supplies. Some of them even had a filament winding for a vacuum tube rectifier I've gotten some of those a few of them quite a few don't remember when they were made or if there was even a a rectifier tube in them? Also I remember humongous 12-volt multi-tap primary Transformers. And 12 and 24 volt Transformers. Some were used like on the lighting for Fairground rides in the cars and all. Also various other Transformer similar even including giant low-voltage halogen lighting Transformers. I mean how many amps of power. Also I would find Transformers that had numerous winding and designed for different areas of the world. But Taps for almost any voltage you can imagine. And even multiple windings for different voltages such as 221 + 120 + low voltage and then most attempt primary for input. Anywhere from like 80 sum or 90 volts all the way up to 240 or more input. Also I actually wind up getting old Auto Transformers as well. Even had some Transformers that reminded me more of a model train transformer power supply Transformer. There had multiple endings and more like a variac. But it was a variable Transformer with an arm yeah Slide contact to regulate the output voltage. Also some of these had several windings I don't know what I got them out of her they were from originally. Like a lot of those other Transformers. Also I did have old hundred Watt 24 volt Transformers why would you have something like a furnace Transformer or doorbell transformer but a hundred Watts? Basically a control or signal Transformer on steroids. What they were for originally was low voltage signaling and low voltage lighting control. As well as they would operate low voltage signal lamps in the same system. As well as I got a lot of the ritual equipment with them. There were these thin wall plates that would go in a Meritor Jam in a special box if I remember correctly some of them did have that but others will just mounted in the door from where I understand. There was one a large pilot light with a red Jewel on it on each of them. And most of them had a single low voltage momentary switch 2 position. This switch was used to control the room light through the low voltage 50s and 60s relays. AKA relabel low voltage lighting control or similar name. Where it would just be a relay for each fixture or whatever sometimes it's central location or just at the fixture. The red power light was always on was not switched. When these were originally used that counted as an exit light believe it or not. Of course lined up getting all the spare parts for the system as well so never used parts bonus. Also there were control panels with that one with that as well those are quite useful for switches. Also I got a bunch of momentary low-voltage the steer toggle switches to position again momentary Center off. As well as I wanted up scrapping Howard parts of old dimmers that were used with some of these systems as well. The thing I found most useful was the 24 form a c reversible do wanting Motors. These were gear Motors by the way pretty is full. And unique. also a new people that work for vending companies so I'd always get goodies out of old vending machines. Hey if it doesn't work anymore scrap it for parts. You just never know where that spring that sky looks different and weird will come in handy and some project. By the way speaking of which I got thousands of Springs out of one Salvage. Put this way our church got a new pipe organ. my father was even salvaging for me. Roundup of all the organ power supplies as well. Turns out I want to get a bunch of stuff from New York and Company is well out of their place cool
I've seen those type of transistors in plenty of Hi-Fi amplifiers, mostly higher powered ones. I believe the package is just to provide better mounting and heat dissipation. Take a look at the data sheet, I bet they can handle a ton of power!
this feels like the EEVblog from the olden days. if you have time, just tear down random stuff. You still have tons of gear and mail-in items that you've never torn down. I remember you still have a few microdrives (those 1 inch harddrives) and you're good at macro shots. I can understand if it's not worth it for the money, but it's definitely entertaining as a viewer to see teardowns.
keep Teardown man i love it i was sub from like 10 years ago my 1st videos was I Watched was Panasonic Plasma TV's Suck and i love it be save much love from other side of the glove Bulgaria and sorry of my bad eng :) 👍😊
Would have loved one of those at uni. All we had was a gradient hotplate that you had glass slips with chemicals on known melting point. Decent bit of kit there!
"Somebody got their tongue at the right angle and tweak those" when the Chinese translate this they would be scratching their head, lol Sanken used to be famous for their Power Amp chip
Not sure anyone has taken the trouble to point out a couple of things that will really help understanding: 1) The actual sample is TINY, is contained in a glass capillary tube of Ca 1mm diameter, and at the point Dave is showing the heating element, you can just see the holes in the part that aligns the bottom of the sample in close proximity to the thermocouple. The silicone oil stays in the unit for years at a time unrefreshed. There are usually 3 sample positions to enable comparison melts to be observed. The design is clearly based on the superbly-engineered Swiss Buchi precision melting-point apparatus (which had a mercury-in-glass thermometer rather than all the electronics). The best part of these, as any science student will attest, is making the glass capillaries with a piece of glass tubing and a Bunsen burner. Awesome!
I consider the main channel "serious business" and the second channel "fun." Main channel I only watch if the content applies to my interests but I always check out the 2nd channel to stumble on cool things like this. The spring is just a spring. the heater is in the tube just above the impeller.
1st view @1.25 I thought it might be a 2020 version of those 'What the Butler saw' machines on the Piers in the UK, with those fuzzy B&W risque films in. (so a friend told me)....
This transformer brings some memories back : there was exactly the same transformer inside a CRT monitor that came with my first computer - Amiga 500 ! After it stopped working, I used this trafo to make my first power supply ...oh the smell of it when it got hot !! I can almost feel it, even after 24 years ... And yes, the core is not a coil. Its laminated ...steel (?) ( Iron ? ) ...
Just ordered a micro current. Unfortunately it will not get to me for a while. I’m all the in the USA in New Hampshire. I think next week I’ll order the 121GW meter. I have to have one if only for the back to the future reference and the fact that it says EEVBLOG on it.
@9:46 "But the best part about this thing for me is that there is no digital control rubbish, none of that processor rubbish." _Cue Bob Widlar poster._
The famous Dave's magic dumpster delivers again. Though after what I have seen before I would not be too surprised to see a video of him rolling even the whole MRI machine or something from down there.
People are to brainfucked anyways with all that brand bullshit, biggest part you pay for their image anyways, especially german products, under Hitler there was maybe some quality, but all in all just primitive massgarbage with a blown up image, because germay doesn't have anything to offer, because it is in fact one of the poorest countries, no ressources at all and even the fields aren't enough to feed half of the population. Look german cars for example, cheap massive rubber coated plastic covers the '80's US-techology. Never understood where that image of Weller came from, just overpriced garbage, like all "german" products, like their schooling soldering stations, a cheap soldering iron connected through a poti to a cheap transformer, packed in a cheap plastic housing but they charge 80€ for that and -people- idiots pay it.
It's weird because you'd expect like an AT IBM in the bottom, but I am not sure it was a proper IBM with a dip cpu or not. The ports are sort of AT ish but maybe that is some sort of external control. It is a lot of chips for a controlled temperature heater...
On the type of transformer: www.custommag.com/r-core-transformers Seems the main purpose is to minimise flux leakage while also being very easy to wind compared to a toroidal. The core is not separable, it is made of rectangular laminated pieces. The reason they are made a cylindrical shape is so that the bobbins can be spun in place to wind the copper onto them.
You see these kind of transformers typically and only in Asia. Does anyone knows the background story of them? Would be an interesting video. These Sanken transistors are classics! Very typical and really worth a penny nowadays.
Japanese design, using a tapered laminate that is wound into the correct form, then potted and then cut in half, so that there is a very well specified magnetic characteristic. The bobbins are then wound separately, and the design gives very good isolation from mains transients, as the capacitance between primary and secondary can be low, as they are on physically separate formers.
Not far away from soviet transformers like the TC210, but I don't think this is that much specific to any country but more the time, even though I never seen such transformers made in USA or Europe. But I love that design, the soviet ones were pretty smart, on both coils you had the same ammount of windings, the secondary was just split, if you connect all the seperated windings you have an isolation transformer, I'm very jelaous about the fact that russians etc. have easy and mostly free acces to this transformers.
"The design is so old school, but the date codes are 1999!" As I've mentioned before, if it ain't broke. It has one job, it does it well, and the people who made it couldn't be bothered with trying to reinvent the wheel.
I want the glass vial part just for an ornament. Can it be shipped AU for a fee? That is an unusual bit of kit. I've seen heaps of those R transformers in my time, and the comments are right, always on Asian products, except for an old TV I fixed years ago (but was likely Japanese)
Highly serviceable circuit, can be serviced for next 100 years, even if there is a chemical spill circuit can still be repaired easily. But most probably rehash of 70's or 80's circuit.
Those Large power transistors were widely used in the 70's and 80's in stereo amplifiers . And those R core transformers are used now days in audio amps
1:18 Top Right translation... "Shanghai Precision Scientific instrument Co Ltd (Physical Optical Instrument factory) Top Left translation... "WRR melting point instrument" 1:39 I haven't seen rainbow ribbon cable for many years. :) 3:51 That looks so home built and so does the rest of the device. Old school "Made in China". Not quite up to the HP test equipment standards. LOL
