And there's a little Ethernet slash USB board isn't that nice. Like the quality of the PCB material, there looks really schmick nice. A gold-plated card edge connector end I've got an ST arm micro for those playing along at home and the McCrystal job'. there is it.

and what else? an out error, something or other that's a sin that's a little left. PG Iocp OD Is it? These are bloody self tappers? Oh yes. I Unbelievable. Hey got it for Nix Anyway, yep so we had to get that off.

- I Take the whole back panel off here so stuff tappers into there. it's a bit how you doing and then just to oddball self tappers on the bottom and it looks like stunning. Here we go. Whoa, we're in like Flynn Wow Look at that open chassis.

look the asteroid or transformer. Ah, beautiful thing of beauty is a joy forever. Of course they haven't made the mistake of, you know, shorting out that nut to the top. Yeah, it's yeah.

it's not touching the top case because then you get a shorter turn and that could ruin your day assuming that it's connected down to the bottom. Yeah, look at that. Oh wow, look how they've done that thoroughly. Interesting construction look.

They've got this open frame. They've got this big-ass heatsink. You can see the fins right in here, which goes from one side to the other, so one side has the fan on it. You can see the fan down there and they just like extracting it like that.

That is fascinating. You've got to ask though. Why make it this length? Okay, you've got to make it this big. Got this big-ass toroidal transformer here which is beautiful.

This is a three channel unit. Okay, so you've got the optional third channel up here. You can see all the mounting holes. for that.

You shrunk the board a little bit more and got rid of it. Made it this long. Like, maybe this long instead of that long? I Don't know. Maybe they had some requirement to make it that length.

That's just my feeling though, is that it could have been made a bit shorter. There's our relays, of course for our tracking switching. You can see those down there. That's very nice.

These boards are completely galvanically isolated from each other. but isn't that? that's just gorgeous design and construction. I Really love that. And they've actually put a metal on top here so that it didn't interrupt the airflow going through here.

Because you see how we had all those vent holes over here like this, which helps with the radiated heat. But of course, you don't want your airflow to be interrupted. You want it to all come from your fan here and all go right over the fins of the heatsink. You don't want it buggering out in or out of these holes here.

So yeah, you want to put that that top cover on there? That's nice. but there's a big relay over on the main section here. Ah, and look at the dock. Hang on.

Look at the reel, clunk, and power switch with the rod going through. Ah, Beautiful brings a tear to the eye. Check out the mains input board here. Look at that big app.

Costs choked there. That would have cost a fortune, wouldn't it? That's just that is beautiful. A little ferrite ring they've got around those if cable tie those together and of course your earth is it's going from yet the main board down there. It's all crimped properly and going over to the case.

It's beautiful. Nice, neatly wired. It's just gorgeous. genuine.

Omron Relay for all your armor and fanboys, there's a lot of them out there. And why they've got that on the mains board? What are they doing? And they've got two wires going over to the power supply section. Not sure what's doing there? I Mean you know I've got the big mechanical clunking mechanical power switch here, so it's not like a soft power switch. Nice attention to detail on the interface board to look at the thing.

The ribbon cable got a little ferrite around that and that's going over to your front panel in that neat Oh bit of flat flex and it's really interesting how they've done this. I mean check out how much room they've got in here. You could swing a Schrodinger's cat in here. It's unbelievable like.

but here's your front panel board over here. Okay, there's your. they've got ceramic output caps. that's interesting I would have I'm sure they're like art.

you know the proper termination one so they're not going to catch fire. I've done a whole video on that. Here's your wiring coming over from the front. they've even matched the blue look at that isn't that gorgeous.

And then here's your wire in buggering off right to your back terminal. You've got your power wires plus your sense lines as well. Looks like we've got an Atmel microcontroller down there handling all that business. What's that micro? I Can't read that on the screen controlling all the business on there.

I've got some local regulation here and another Omron to relay to do the switching and you'll notice that this Channel 5 AB Rated this beast over here isn't just flapping around in the breeze, but this one up here has an angled heatsink going back over to our main heatsink. They've got a Silpat on there too. Well isolate that. So this is the 10 amp.

Channel That's not going to be the output transistor. Maybe that's the over voltage clamp. Perhaps because it's right near the output like that. Oh Actually, that's a single job' You can see there's some extra holes there and this one.

Joule There you go for the 10 amp one. so we've got them back to back there. I've got to read a part number off that uh-huh that's actually the output current sense resistor that's a P B H our 100 So our 100 means 0.1 R or 0.1 ohms. so it's a hundred milli ohm shunt output shunt resistor.

Here's the datasheet for that, and of course you, they needed two of those. They're probably I don't know working those in parallel for the 10 amp job, so that makes sense. It's a 3 watt precision power resistor. Not necessarily a fan of these big tall caps here just flapping around in the breeze.

I would have liked gunked those together or don't like to have seen that anyway. I've got some extra little power down in there by the looks of it. Maybe there are like a part of a Darlington pair for the main power transistor. I Don't know.

I'm just guessing there, but hmm. what's that linear tech job'? What is that? And nichy corn of course. Spared no expense. Really spectacular, Spent no expense.

Once again, the 10 amp module is actually significantly different. Look at this big choke here and compared to this one over here on the 5 amp, they look like a very like, you know, very similar configuration. They both got these 3 caps here. These 2 caps in here, but very different.

little choked up here. little huge look at them, but they've got two main filter caps are the same on both. No, it's for the bottom of the board. Here's your big ass bridge rectifier.

Some smaller little bridge rectifiers in there by the looks of it. so they're just tapping off some multiple stock. Well, looks like we got some surface mount few Z's in there I look at that Mel freezes. Tie that to have one milf resistor on the whole thing, didn't they? Yes, Thank you very much, you know.

I Love my mouth resistors. They're our output power transistors. Like it's just that just seems out of whack. There's that well put power transistors and there's a big-ass bridge rectifier on the input.

Unbelievable. Anyway, that's a bigger surface mounting Dr. and looks like we got a couple of little up there couplers there on the output and that's about all she wrote. There's our white reverse diode protection on the output and not much else doing on the bottom.

Oh, they're actually not the same I Thought they'd be identical. and there's your high voltage. Our noise suppression cap. Go into Mains Earth because this screw, of course goes like this little isolated bit of copper here, which isn't connected to anything else, but it's connected to that screw which is connected through to the heatsink, which is of course connected through to your shows ease and hence your Mains Earth.

But of course, these are going galvanically isolated outputs. so this is your actual output ground party, a circuit from your bridge rectifier going through to your output. But this one's interesting because they've got three parallel pads Here, they've populated one, and of course, you wouldn't really need to populate more than one. But why you'd have three pads as part of your layout? I Don't know that Shen's not really gonna matter.

Hmm Beulah Beulah So that looks like a real robust and professional design as you'd expect. and of course, like on a real high-cost professional wire supply like this. you know you're going to get like your noise performance yeah, common mode chokes and you know everything to prevent like mains, noise and stuff getting through. You know the big up cost filter up here is just you know, like really spared no expense in getting that down and that's what you're paying for in a you know, a real top brand professional power supply as opposed to someone hung low eBay Chibi or some you know built down to a price kind of power supply.

So I'm just thoroughly impressed by that thing. that is just some nice brilliant design and construction. Oh sorry I thought these were the output cast, but they're not. They're also I going down to our no suppression down to mains.

earth down there that is your tiny amount of output capacitance. one little ceramic job' Yes, I do hope that is a you know one with our flex terminations on the end. but of course this board's not gonna flex. but still, you know I probably would have put two in series maybe just to gild the lily, but anyway, you don't want a large amount of output capacitance because in constant current mode, if you have two larger output capacitance, it can effectively override your constant current mode and then dump the energy in the capacitor into your poor little device under test.

And well, your current limit didn't do its job because there was all that reservoir capacitance on the output. So you really want a minimum amount of output capacitance, just enough to keep your control loop stable And that's it. No more. so cheapest power supplies might have.

You know a large amount of our cap and put capacitance just to make the control loop more stable. They just, you know, whack it in until it's stable and Bob's your uncle. Oh, but of course your Earth Filtering caps in here. They're also going to be basically two capacitors in series between your output there, except that the center tab is going to earth, but it is effectively Apple capacitance to.

And there's our front panel micro for that that'd be running all the effectively. the OS for this thing. And of course we saw the individual micro controller on the individual output boards. but this would be running like the display, the interface, the Ethernet and all the you know, the USB control and all that sort of jazz, so it's not much else on that front panel board.

The paranoid in me though I Can't help but think that screws a little bit high. Yeah, look at that. it's not. It is below the surface of that, but there's nothing inside the case like there's no insulating inside the case to prevent and there is a bit of bow when you put this case on, you can't actually press it down a little bit and in theory you could actually press it down onto that bolt and you'd have your uh, shorted turn from the top to the bottom.

So should I give it a go. Should I poke the top of this? haha. Three amps that three point six amps don't want to shoot you turn out don't All right? Check this out. I put the case back on.

hopefully you'll be able to hear this when I press on it, see it bottoms out and so if you actually had if you set something on the top that would you don't like it I don't know it's another instrument or something I don't know your coffee mug wouldn't do it, but you know if you put some it requires a fair bit of force. but there's like, you know, and maybe three or four millimeters of travel. but it does actually hit the bottom of that. so in theory, but it's probably protected by the by the the coating on this.

It's not bare metal on the back so they got coating so I wouldn't short out. but it's like if you had a sharp bolt on there they can pierce through. That's possible. Hmm and I'm nitpicking, but I Just noticed that now for the Ng E100 or it's the 103.

I think warranty expires if broken. Well look at that. It's not even a it's nothing gonna screw under it. so that's the back cover.

How does that come off? I Got two of the screws yet? What's going on? Okay, yep, it's upside down. Well here we go. that green like Flynn there's the bottom part. Oh, that's it.

Dead like why? why? Why do you have a very neatly laid and jumped down wire that is a beautiful mod, but I can't help but think that's intentional. I mean why from I Don't know. and they've done this well. This one is the looks like that.

Let's go into your mains. that's going to your shizzi mains earth and that's going by Granof under there, that's your USB port. Wow They serious about a low-impedance earth path to the USB port. Very uninteresting on the top.

so we're gonna have to get in there and have a squiz. but once again, a really big ass toroidal transformer in there somewhere and well, somebody had fun with the her. I'm a wiring slaves here Wow Okay, they really didn't Maybe want any sharp burrs or anything to cut through the wires and it looks like they're all cable tied through there. Wow Okay, so what we have here.

three screws on either side. It looks like he's going to let you pop out this module. Presumably we thought that I actually think it's got to tilt out this way. so maybe I need to put it like that cuz you've got the heavy toroidal transformer at the front here.

Wow, this is really competent compact system engineering. I'll get back to you I feel like I've got to be a contortionist to get this out. Maybe I can get down there and pull it. and now they're all all the connectors in their ass.

Elastic? You can't see that. but well, in a minute I'm going to assume that this sort of swings out like this. but I can't think I got it. Something went crack.

Yeah yet? no. I got to get these cables out here first before that'll flip out. ha. I have conquered it.

Um yeah, look we did like take out the fat like had to systematically take out this cable over here, then then the fan, then this one as you opened it up. but look at that isn't that. Just like that is just fantastic. System design have the compact nature of how they're You know they leave all this space in here for this big-ass toroidal transformer once again.

I think we have an issue there that bolts not going to be a problem but soon on fan. For those playing along at home, we'd like to see their fan brands. oh sorry I think I shot all that with manual focus on don't sorry if that was all out of focus. We're back in focus now and beautiful and we can see our separate channels on the PCB.

It's one big-ass PCB but you can physically see the galvanic isolation on between all the channels. Of course they're all going to be identical because the power and performance on this model I believe is all identical but the biggest cat, so have a look at those in a minute surface mount heatsink on there, so not much doing and wiring. It's just. it looks like it's just solid flat.

onto the PCB That's interesting. Yeah, that's a really interesting arrangement. look at that. And of course they got a sense line coming back.

which is, you know, nice. You'd expect this in a professional supply, so it's reading the voltage directly at the output terminal. Of course, this is doesn't have any external sense terminal either on the front or the rear, but they're actually making sure that they read back the exact value from that. But look, they just and just tin those leads and tap them down to the pads.

I That's that's fine. I Mean it's just. it's neat and tidy. It's simple.

Um, I just sort of like expected connectors, but there's no reason you can't do it like that. It's perfectly fine. Once again, we've got our mains, our output to ground mains, suppression cap there. We've got that on each channel and looks like there's no additional output capacitance on the output terminals.

All of your output capacitance is contained here and they got different values in parallel. Look itty-bitty teeny-weenie and a oh wait, a 5 and then a 1206 and then a couple more like that. Well, they're like really serious about their different types of output caps. That would be our reverb.

that would be our reverse diode protection there. there. our current sense output resistors. They'd be tap in, they'd be doing your our Kelvin connection to that, tapping that off up more current sense resistors over there.

And as I said, the output. hang on. This has to be a switching supply because. heat sink.

that little piddly surface mount heat sink. I Like that. That is not enough for a linear supply. So and neither is that their fanner her fan are there are gold dots aren't They love it Once again, and we've got niche econ main caps in here.

There's our bridge rectifiers on the input. Yes, so I Think what we've got here is this is actually this is most likely the output linear regulator, but it's got a tracking switch in pre regulator. here. These are our 80 volt jobs and the full wave bridge rectifier from the mains creates a DC and which is got a DC to DC converter which then is tracks you know only like a volt above or you know half of all above so that regardless of your output voltage, it's gonna be super efficient.

So you only need a tiny heatsink on your secondary output linear regulator. But of course, using the output linear regulator, you get much lower noise than just a direct switching output power supply. And sure enough, if you have a look down in there that's a NCP 103 4 which is a synchronous buck converter. There you go.

So yep, they're just bucking that down to as I said, probably like you know, a volt at most above the output pre regulator and it's always tracking that. So of course this is getting rid of most of your noise they'd specially-designed usually like a lot of us secondary, you know, linear regulators aren't very good. I've done a video on this somewhere. if like noise just you know, pass a lot of the noise passes through so they'd be really looking for the power supply rejection on the design of the secondary output regulator there.

so this is interesting. Here's our mains power switch here on the front and is a proper clunking power switch that comes from the IAC connector at the back. No worries. Got the nice-looking input common mode choke and all the requisite protections.

Then we've got some sort of little isolated secondary power supply here. You can see it's a a seat up from the transformer bridge rectifier and a and that looks like maybe a little lost switching converter or something. There little fuse job' down in there. This is actually the fan controller here and then This is all your primary taps for your transformer which is connected over here at the back of your voltage selection.

Switch over here. So how does the mains get from here? Bypassing all this over to here? You know you might think it's on the bottom and you'd be right, but that's what this bypass wire here does. It takes that mains over there, tipped it over to your primary transformer. So what? They run out a routing room to sneak it over.

Hmm. because you can see the other trace here going actually on the bottom of that around. like that, just avoiding the history sections here. So PCB Design I Went on.

Geez, what are you doing to me? Maybe it was like a later edition or something. Maybe they just got to the end of the layout, you know and went oh yeah, forgot all about these. We'll shove them in here, but oh, we don't have the electrical clearance. no likes, lots around it or anything like that.

Um, we. which is fine. You know if you've got the creepage distance across here, creep edges across board, and clearance is across an air gap. So I've done sure.

I've mentioned that in many videos Anyway, Yeah, there's no routed slots to get any our clearance instead of creepage in there, but they obviously decided up so let's just run an extra wire. Okay, it's nothing wrong with that. It's done neat and tidy anyway. Hmm.

Nice big board and these are all your secondary outputs of the transformer going into bridges smaller bridge rectifiers. They've got multiple or two per channel. There's another bigger one I'm sure. Yeah, Up there being a bridge rectifier.

so three separate rectifiers. they're supplying various whatnots. and as I said, electrically isolated on each channel, you can physically see the light shining through there. Forget my torch.

There you go. that beautiful galvanically isolated between each channel. You might notice they this ground up here. Once again, these are these AC caps.

So a lot of ver stitching in there and they've joined these together. All three snake up there. That's where it goes back to your shows. e.

There's a front panel board down there. There's our Wi-Fi e thing and looks like we've got a bigger SAP mill processor down in there that's running everything you could possibly imagine and there's some memory and D RAM and flash and all that. So yeah, it's probably running some Linux e thing. I'm sure.

Whoa. The shielding on the ribbon cable going over there. look at the Excalibur silastic gunk. Somebody had fun and you might be asking or you should be asking Dave if they're all galvanic Lee I Said like this: how do they actually control each channel going over? well I'm glad you asked.

So all the control signals come over here for all the three different channels, but you'll notice down in here. boom and bump down in there. that is your right serial isolator they're using. Like maybe? is it? What are those analog devices? atom chips or something like that? Anyway, just like you know, serial, They don't need anything like high-speed really going over to each channel, but that's how they electrically isolate the data going over to each channel.

So once again, I'm thoroughly impressed by the design, construction, and the engineering. Oh Just wanted to show you there's those cable ties and look, oh look at all the braid for each wire. It's just beautiful so that it you know it goes over the edge and doesn't Nick It fantastic because like is you got to assemble this like this and the wires can rub over the you know. potentially.

they aren't sharp, but they could. You know they can potentially be a burr there or something like that. Anyway, Beautiful. Like fit to envelope our design there.

Try to keep this as compact as possible unlike the previous ones we saw that we're you know, like there's a fair bit of void II space inside there and there's nothing wrong with that. but this is obviously for a different market. It's designed for a more compact benchtop unit and very impressive design and construction. So this is the difference.

and like if you look at this like which is $1,000 class power supply compared to like the Rygel which is what four hundred dollars or something you know like half that four or five hundred dollar supply. Yeah, this one's you know it's better engineered no doubt about it and it's going to be. You know, a much more efficient and lower noise and everything else. So yeah, it's just beautiful.

A lot of works gone into that. So hats off to the designers of Rohde & Schwarz. Rohde & Schwarz don't make crap stuff. They you know you pay your money and you get your top quality.

It's just beautiful. Oh This one isn't self tappers and the bigger one. we have a quick looking sigh. but I expect it to be very, very similar to the other one except that's not a transformer, that's a transformer.

Oh I Do believe you'll find that this is near identical to the other one, except you know we've got the big Jule current sense resistor here. Going back, it's like virtually an identical layout because these are all 10 amp outputs. So yeah, really identical. across the series, the input switching rig of the input switching pre regulator looks exactly the same.

So yeah, nothing much to see except the badass transformer. I Just can't get over that. And didn't the other one have a flat? and this one just mounted vertically like that and the rod going through says fantastic. Look at it bigger and beefier.

and of course those front panel boards down in there. They're going to be slightly different because the configurations are different in terms of the sense wise, they're just like the grouped in 4 to above the other instead of out horizontal like we got on the 20/20 There don't know how to convey the size of that transformer, but like there's my hand looking the size of that and like it's in a way more just the transformer alone than the entire Nge 100 supply here. That's just nuts. Oh.