Hi, yes, it's auction score time again and Tada take a look at this. It's a tower of Agilent tariffs you? what? Packard tariffs. Keysight Goodness Yes, they've called Keysight now. Anyway, check out what I got.

Didn't get it super cheap but I you know I prayed it paid a decent penny for this stuff. but I think I got some really good bargains in the mix. Check out what I got I've got no less than six Agilent Well I've got five Agilent 6643 a 35 volt 6 amp DC system power supplies these are 200 Watts a pop I believe and I've got 166 for 2a which is 0 to 20 volts at 0 to 10 amps. I've also got one of these very nice a 36 46 Joule output power supplies I bet on another one of these which was a triple output one, but that was going a bit high.

so I let that one go. You've got to know when to let him go sometimes, but you can't get caught up in that auction fever. But anyway is that these are very nice power supplies. and I've got a Keithley 2400 sauce meter as well.

Fantastic! And I've got two HP branded a 34 double 8a multiplex switches and these things. They're practically given away. Nobody wants them. They're practically free.

And if you want like a GPIB controlled switch or something like that, these things can actually be quite handy because nobody wants them. So check them out on ebay they are. We might open one up in later or in another video. You can actually score some good parts out of these.

But these system power Supplies I Really love these. These are great. Now the issue with these power supplies that they do actually go quite cheap and it is a way to get a really good bench supply because these are super high quality of these. Agilent still sell these is these are worth like over 3,000 I think about 3300 Australian dollars each for these things if you bought them brand new these days.

but yet because they are a system power supply. the connections are the back so they don't have banana plugs on the front, but there are. You can actually get in there and feel that there are holes in there for the binding post terminal. So I'm going to actually look at maybe modifying these to put the binding posts on the front to make them much more useful.

But these are fantastic system power supplies. They cost a lot of money for a reason. They're superbly engineered, they're super fast response and super low noise and just great system. or DC power supplies and this beauty I Got an Infinium 1.5 gig bandwidth 8 gig samples per second for channel scope and these Infinium can actually are Go for quite decent prices.

If you're after like a super high bandwidth analog bandwidth stuff, these aren't a bad option or not. This is the vanilla I can't remember the model number it's not actually on here, but this series doesn't have a huge amount of memory. It's only got 64 K memory per channel or 60km channel or something like that. but that's more than good enough when you're talking about this.

sort of bear with to do some great analysis on. So there you go. Um, quite a decent score obviously. I'm not going to keep all this stuff, but I just love it-it's couldn't resist picking up this stuff at auction.

There's a whole ton of stuff which went fair. Some of them went for crazy prices, but yeah, this is what I managed to pick up in the bidding frenzy anyway. so I'm pretty happy with it. so let's take a closer look.

Now, all this stuff comes from a company that's gone into liquidation. It is a precision mechatronics and they were actually a spinoff from that Silver Brook research If you're familiar with Silver Book research. I've talked about them before. A absolutely crazy company run by, well, a crazier person.

and there's no surprise here that some of the other gear is also branded that silver Brook research on it. So obviously they were swapping gear and stuff like that, but this is where it all comes from now. This is rather interesting. One of the power supplies here has property of Ventricle Limited and they're a medical device company that went into I remember their liquidation auction like I don't know how many years ago it was quite a few.

me three, four years ago or something like that. maybe even longer. but yeah, obviously. um I'm not sure if they were affiliated with Silver Brook and the other branch off companies at all I didn't think so from memory, but yeah, maybe they well as somebody from the company art picked up a lot of this gear from or some of this gear from the ventricle liquidation auction.

So what goes around comes around and the oscilloscope actually comes from an American equipment reseller? like a rental. you know, like a maybe a surplus equipment seller Avalon test in the US So yeah, maybe they actually picked up a lot of this stuff secondhand, adjust, salvaged it from anywhere they could, which is rather interesting. They didn't buy them brand-new and the reason why a lot of this stuff went for big dollars is not only are there a lot of dealers are at these auction things like test equipment dealers who like to buy stuff in Vulcan that bulk and they're very cashed up and stuff like that so they'll often outbid you. But also I was talking to a guy there, he was picking up some stuff and he used to work for Precision Mechatronics and he said yeah, it all closed down in a hurry and everyone who worked there all wanted stuff and things like that.

So yeah, there was a lot of bidding frenzy on this stuff. but these system DC power supplies if you haven't seen them, are oh you know, quite nice and not like a regular lab bench supply. They are exactly designed for what they say. They are like a system, you know GPIB you know, computer-controlled the power supply, but look see they've got.

there's some holes in the front depressions in in there. there's one down there. so I'm I'm not sure, but III think there might be a chance that maybe we can install? I'm not sure if they're designed for Biden post I don't think so I've never seen like an option or anything for them, but they've got some sort of hole in the front panel. but even if they didn't yeah, I'd be looking at that.

maybe drilling some holes in the front handle of this thing and Olas calibrated in 2008 June 2009 so not particularly new. but anyway, no these power supplies there I guarantee you pretty much all of this stuff is going to work I'd be very surprised if any of it doesn't work. And here's what's on the back of here. We just got some my big heat sinks.

There's a fan on the inside which pushes all the air out and we've got some digital control stuff here. We've got J1 and J2. There's some sort of you know, control interface or output I can't remember exactly why I haven't used one of these in a long, long time and I GPIB of course and this is a 240 volt unit only local and remote current sensing as well. And here is really the only major thing I don't like about these is that the output terminal block look, this is loose so um, you know and it's directly PCB mounted on there and I yeah I'm not sure whether or not that's just the connector itself or whether or not the solder joint is actually loose.

It might just be the connector, but yeah, that's the thing you know I don't really, they're just. they're great when you have amounted in Iraq and this is what they're designed to do is mount in Iraq and then you're worried India You know you're a te automated test equipment stuff like that, but yeah as a general bench supply that's really annoying to have the terminals on the back but it's got the UM sense line so you can do remote sense and stuff like that and some auction houses a really bloody annoying. they put these horrible like almost like security type ste because they do actually have like a Metallica back in some of them and they stick them on and they never come off. You know, cleanly and yet.

so if you're looking to resell these things on eBay I'll just have a generally clean machine. You're going to clean these things up. I Love it! For engineering use only. You're damn right.

companies will typically put up for engineering use only if they just couldn't give a rat's ass about actually calibrating the thing and maintaining the calibration. And you know, stuff like that's not being used for production or you know it's just used for a jig that you know isn't really taking critical measurements or something like that. or in this case actually, it's supplying power and things like that, so that typically you know stick a sticker on like that and that's probably why it you know hasn't been calibrated since 2008. All right, let's power one of these puppies up as I said I'm pretty darn confident I'd be very surprised in any of this stuff has actually I'll fail because the company you know they shut down in a hurry.

it would have been pulled straight off the factory floor or the test center or the R&D center or something like that. So here we go. a dress - that's good. It's booting and bang.

We're straight in. look at that. and they do have that rotary encoder knobs not that huge Er resolution because this is, you know, a good 0 to 35 volts. This comes in various models of six, six, four one a, the four to a the four three and maybe there's a couple of others too.

So yeah, right down at that low end it's a little bit I can and I tweaked it a bit. but for a 0 to 35 volt supply, that's pretty good and then we can set our current limit. Of course it won't show up there because we have to actually put it in, short it out, and put it into a set current display mode. And then we've got various side displays.

We can actually display the voltage and here we go we can actually display the set current there so we don't actually have to short the output so that'll go up to all the way to a constant current of 6s as I said I Believe These are a 200 watt total System power supply and they've got over voltage protection here so you cannot set that. So we go over voltage, got over current protection and you continue to turn the protection off and on and it's got now put on off switch, Disable constant voltage, Constant constant current display. You know it's not that it's not as easy to use as a regular Art bench supply, but hey, you know, if you've got one of these in your lab, you certainly wouldn't be complaining. And of course then you can got voltage up/down buttons and then you can type in so we're your voltage.

If we want to do our you know, five Point zero, Zero Zero volts. No problems whatsoever. There we go. It jumps back to our displayed value and that's actually not the At value.

that's actually the actual measured output voltage. So I'm pretty confident we'll actually get five volts on the output and there you go. That's good enough for me, that's set for a value of precisely ten volts output. and that's exactly what we're getting at its regional smidgen high half Abby's Dickey One of the other downsides to this unit is unfortunately the relatively noisy little fan in there, which is a, you know, pretty much just trying to push everything.

Not sure if it's a variable speed or not, but yeah, it is pretty whiny. So if you're really if you had a lot of these things running in a rack, they can, you know, really churn out some noise. So yeah, you might might want to replace it. maybe with one of the more modern silent fans, but if you want to push it near its maximum - under what capability you'd just have to be careful that you got the airflow right.

As I said, I Do like these bench these comp more compact. Well, they're quite high units, but they had, you know, relatively compact form factor compared to the Yatin. You know, the 19-inch rack ones like these. So these ones do actually, and they're shorter as well.

These do actually fit well on a test equipment shelf. And yeah, this one's only the Joule output one. As I said, I did bid on the triple output one, but it went too high. I Probably could have got one easily otherwise for the same price.

But anyway, the problem with this? This it only has a single output display, so you can only display one of the outputs voltage and current at any one time. So you know, really, having a triple one is probably maybe a bit overkill. Anyway, still very handy. two isolated outputs, switchable ranges of course Art because it's a linear supply inside.

sight changes the tap so zero to eight volts at three amps per channel and zero to twenty volts at 1.5 amps per channel I Think it's like a sixty watt power supplies and on the other end here we've got Rs-232 interface. Very nice. you know, handy if you don't have GPIB of course your standard GPIB interface and also your outputs here where you'll notice the jumper links to what. Return the justice.

Somebody's use those two short the sense outputs. This is the 230 volt. Well, it's set for the 230 volt. Whew.

I'm not sure if they're actually switchable inside, but let's power it up. Here we go. Could: Chuck Well, vacuum fluorescent display output off. Bingo.

Ah, like a winner. So yeah, you've got to actually, um, choose your out one out two. it's not that great. Would have been nice if there was like a lead here to tell you what which one you know ie.

is the output on or off and B you know which one is actually being displayed up there. but I guess you've got to look at the display anyway so you know Anyway, it's not that terrific. At low high you can store an store and store and recall art stuff and output on and off. and there it is.

So we can just win the week up on that puppy. And that isn't the set voltage, which is a little bit annoying. It is actually the output voltage rather than the set voltage then of course I don't like the way that they just dim the digit there. it's not that terrific.

But anyway, Big I can actually wind up that and there's no velocity control on these. But even so, these aren't really a really great performance. Our supplies and they're well worth having. And you know it's not a bad interface.

It could have been better, but yeah it once again. of course it's going to be pretty darn close to spot-on You could actually even probably our software calibrate the thing if you're that keen. But yeah, we can just jump between input one and input two. And as I said, all this stuff is going to work I Can you know if you want to fully test it? Of course you get out your load and actually test the thing under the load, but I've pretty done.

Sure they're going to be fine if we go into the view here. we can actually go into display and we go into firmware revision and there we go. 1.75 100? No idea. Anyway, we can go back in there and we can go Cal string find out when I was last calibrated factory cow was 26th of August 2010 and these ones aren't hugely quiet, but they're not as noisy and whiny as the system supply we saw down here because I it's got a bigger fan and I'm not sure if it's a rotating slower or has a should have variable-speed on the thing, but anyway, you could actually replace that with a modern are silent one.

No problems whatsoever and I'm going to keep this one so I will definitely do that. I think I'll just replace it with a silent one. It's going to be a standard sized fan so it should be no problem whatsoever now. I'm very excited about this one.

an Agilent Infinium Eight five four eight four five A. He doesn't have the model number on the front, but it's on the back and it's part of the F5 for 800 series. 1.5 gig analog bandwidth. There you go at 8 gig samples per second.

Brilliant! So this is by far the highest performance our oscilloscope or bandwidth oscilloscope I've got in the lab I do have the one gig tech MDO 3000 but yeah, this thing 1.5 key and yes, I do actually have a probe to go with that I haven't actually looked in the top yet I haven't opened up I thought I'd save that for on camera but I do have this nice agilent 2gig active probe which I could actually use for this thing if I decide to keep it. Now to me, this is one of the best laid out oscilloscope front panels ever. Why well look at these verticals. They're all lined up with the BNC Here you've got separate controls for all four channels.

nothing to get in the way, no clutter. You've got your on/off switch right above here. Then you've got your position control above that. Then you've got your coupling AC and DC separate switch exactly where you want it.

Then you got your input termination 50 Ohms 1 Meg Then you got your art scale, adjust and up. Here you've got your horizontal, which is a physically bigger knob. It should be the biggest knob on the scope, the horizontal always. Otherwise, it's a fail.

You've got your delayed button there, effectively, your zoom function, you've got a horizontal just and then your separate trigger. Or you know, like nothing really to get in the way. and all the stuff you need with the lights right above them. Look at this, your mode.

You've got edge, trigger, glitch, trigger advance, and then you've got your source 1, 2, 3, 4, ox, and line. You've got your slope positive or negative. Then you've got whether you want your single sweep or your auto trigger, and then you've got your various art, coupling, and filters here. And then you run.

stop up the top. Completely out of the way. Yes, it does have a three and a half inch floppy on here for storing stuff, but you could most likely replace that with one of these modern USB key ones as I've mentioned before. So and it's got the original covers on the aux out and the Aqsa trigger in and it doesn't look like it's had much use at all.

So apart for a bit. the knob up here, very common. Let me show you this now. these knobs look pretty crusty, but this is unfortunately very common with these.

Sort of like a rubber type buttons used on these Agilent gear. But you can actually, uh, clean these up with some isopropanol wipes and a bit of elbow grease, so you know they should clean up. But yeah, that's one of the only you know Major problems with getting a secondhand Agilent With these rubber buttons, they do tend to show just that. all that grime from the fingers and everything else just you know easily gets onto these controls.

If we get in there with a isopropanol wipe and bit of elbow elbow grease, you can see that stuff starting to come off. No problems whatsoever, so that'll clean up like a bought one. Now here we go. This could make or break.

Well, I can already sell this thing for like maybe four or five times what I pay for it, but maybe if we're lucky, this feels like it's got some stuff in it. so I'm hoping there's some pros in here. I Haven't opened it yet, but let's have a look and made it like if it's got like an active probe or something like that. Hey, that could easily sell for more than what I paid for it.

So let's have a look. We've got ourselves some relays and ground clips or something like that. What are we going side here? Cow certificate would be my guess. That's classic cow certificate to the certificate of calibration.

There we go. I'm Edge Lint Evelyn Equipment Corp in the US and that was done 2005. So yeah, that was quite some time ago, but yep, it was working back there I'm sure it's still working now. And by the way, yes, I did get the original front cover with this thing.

Awesome! And you'll notice that even though it's got Agilent on the front, this thing still has Hewlett-packard They couldn't be bothered changing their moldings there for a while. So anyway, nothing else left in there. So we've got a replacement retractable hook pack now. Tyco So let's go into the main thing here.

I Expect there to be and then you are. What do we got? Hey, put some probes. We've got some probes. Let's have a look.

There you go, We've got some 1161 eyes. Let me check the bandwidth of those suckers. Aha, look at this. score.

This is what you're hoping you'll get when you buy an oscilloscope. An auction like this. Got four original probes, unfortunately not all the same. I've got three 1161 a passive probes.

These are designed for this one, but they're at times 10 divided a probe of course with your standard 9 Meg resistor inside here. so it's just your regular passive probe. They're 500 megahertz bandwidth each. so I've got three of those pretty good probes in their own right.

This one here though, is in 1163. I Also a passive probe. You can tell it's a passive probe because of the construction of the probe is just normal. There's obviously no electronics in there.

and of course, yeah, you've got. you know, like no power coming across here. you just got your regular X 10 test selection thing there. But anyway, this is a 1.5 gigahertz bandwidth passive.

Pro But instead of having your usual 9 Meg resistor in here, it's got designed for a 50 ohm input, so you've got to use this in 50 ohm mode of course to get the bandwidth. so it's got a low value resistor in series. It works exactly the same principle that times 10 resistive divider. exactly like your regular oscilloscope.

Pros here, but just higher bandwidth. so this one is 1.5 giggle. that one sells secondhand on eBay for a hundred bucks in its own right. So pretty darn happy with that.

I've got a few as I said. I've got a few spare original hooks for it and a set of ground lead original ground leads as well. and these nice little adapters which go to the pin headers like that. so you just slide these over like this, you just slide that over the top like that and Bingo! You can go to your pin headers or and and and I've got some easy hooks as well, so you can just go there.

put those on. So I've got four of those and a couple of spare tips as well. Ah, what a score! and this high frequency passive probe by the way, it's got a kevlar reinforced cable on it 1.5 Pico Farad's our input capacitance at the tip and a and a set as I said, 1.5 gig bandwidth, but they actually specify that as a total system bandwidth including the scope itself. So beautiful.

and I got a compact keyboard as well, a couple of mice, power cord, and an Ethernet cable. And yes, this thing does run Windows and it's actually got a lot of fancy stuff. and obviously you can network it, but it's also got voice command as well. I Believe that's like a software option not sure if this one has it so you can actually say you know, change vertical on channel one to something you know, expand horizontal or something like that and you can actually voice command the thing and and you can get it to email you every time it triggers and it captures the screen and things like that.

So really, sort of you like powerful network functionality in these things, of course, afforded by the fact that. it runs Windows And here goes the big test. Let's pair it on. but once again, I'd be very surprised if it didn't work.

There's some stuff I think I need to maybe take that front panel? Oh, there's a lot of the crap sort of like inside the front screen on that. But anyway, here we go. The floppy drive. Whoo-hoo There we go.

The bias. So the motherboards are working every award. Bias blah blah blah blah blah. Come on, you can do it.

It's going to take a while. these windows, you know. So come on. starting Windows 98 There we go.

It runs. Windows 98 Microsoft Ramdisk Version 3.0 Six, let's have a look. Come on, you can do it. This is why you don't want to use this as an everyday scope, you know, - like just the sheer size and the weight of it.

Of course the fan makes a bit of noise on it's not horrible like that. you know, at Ninety thousand said Agilent 90,000 see a scope that was practically a, you know, a jet engine in the back of the thing to try and keep it cool. but or actually should it take this long. Okay, I think I can still hear the hard drive going but uh hmm hmm yeah, yep, it's still going Infinium There we go, you beauty! And of course we can get the mouse out and our network password bugger off Windows has updated as a result of daylight saving.

Oh yeah, goodness, see, not an every day you scope. I Bugger off Here we go. Just get me in there. And yes, it uses the old of a DIN connector keyboard and RPS to care for the keyboard and a Ps2 connection for the mouse.

goodness. But hey, you can't complain about the performance of this thing. 1.5 gig bandwidth, a gig samples per second which or a window 64 K sample memory per channel which are halves if you turn on all the channels and I'm sure the sample rate might hire half as well. but come on, you can do it.

It's running some self tests I can hear the realise and we're in like Flynn we're in. Look at that. That's it. You know this is actually a really quite responsive scope, so you know.

nope, problems whatsoever. And yes, Beauty I have confirmed that all four channels do actually work one of the annoying aspects of the issue. sort of like a you know, plug and unplug that probe and it resets all the channels. For example, if I go down here like this I've already set that up I can trigger off channel 2 here.

They make it quite accessible in that respect. but you go back to Channel 1 and it's all reset itself. There you go. Little bit annoying, but anyway, that's what it does when you swap the probes in and out.

But yeah, they've tried to take away because this is a Windows interface. They have tried to take away the pain with a really usable front panel here. but the only downside of course is that if you want to do anything else, if you want to actually go into you know menus that you used to I mean you know where is the menu button on this thing to call up the menu and go in and your regular soft buttons that you used to learn the slow scope stuff like that. So anything more advanced? No.

unfortunately, you've got to use the mouse and the keyboard. So I found that the Ps2 Mouse didn't work for some reason. I just plugged in the A USB mouse here and it's automatically are detected it there. so hopefully we can go in and search for the driver.

Yeah, just do it. Just do it next. Bloody hell Finish. Yeah.

and we have a mouse. Do we have a mat? We have a mouse it. What? Ok now here's the interesting thing. the mouse is limit in my movement to just that corner up there because it doesn't because there's nothing else for the mouse to actually click on here.

So it's limiting just that little region up there. So there we go. So I have to go in here. and then we've got all of our stuff over here that you might be more familiar with that you would call up with soft buttons on the side and stuff like that.

But then we've got our full so we can go between that waveform view where you don't, you know you don't have any clutter on the screen, no menus or anything like that. You can't do anything straight over to the graphical user interface. So do they call that waveform mode? It's full screen interface mode and graphical user interface mode. There we go.

and then we can do measurements and do all sorts of stuff like that frequency channel 1 for example, so we can call that up. There it is. but because we haven't triggered, let me boom there, it is near enough. And look at the update rate on here.

it's absolutely phenomenal. The that update rate is incredible. If we have a look through some of the controls here, we can just email a screenshot. That's pretty handy once you've set up your network.

of course I need to I set that up and control. well, you know? Look, we don't need to do that sort of stuff with the mouse, do we? And then we can set up the channel one and do various things. But there's nothing we can't really do there except for like our set up probes and stuff like that. maybe set up the skew as well, perhaps.

And then we've got horizontal and you know it's it's not that great. It is a Dickey old Windows interface so if you want to do anything apart from just your regular stuff at all, then you know you've got to be willing to play around with this so we can jump into equivalent time sampling of course, real time and 8gig. there we go. Configuration: 64 K points.

That's why it wasn't showing 8 gig up there so we can close that out. Sine X Ah, next year we can turn that on. We've got a 9 bit bandwidth limit. What else we got Most sampling rate when set to automatic memory depth automatic or memory or manual.

We can turn our averaging mode on, that's you know. it's something that you're sort of used to setting up on your scope relatively easily that you can't really do on this one. so that's a little bit annoying. And close, let's have a look what else have we got? So if we expand that right out now, we should find that we can go up to 8 gig sample per second and if I turn on the second.

So I've got channels 1 & 3 on at the moment for turn on Channel 2. Channel 2 is not available in yet is not available in this acquisition configuration. we're going to make it Won't even? You know Why won't If I press the Channel 2 button, why won't it just automatically default to the I've now got to go into this acquisition menu and physically change it. you know down here so it allows me to use the other channels.

This it really is quite annoying. It's just you know, not designed for an everyday use scope. But once again, you can't complain about the performance. and we can do our eye pattern stuff as well, jitter and all sorts of things like that.

So you know really, it does ru it. This scope can do like us BER characterization and stuff like that. so that's pretty neat. So we can go into our eye definition here and maybe we can get Noah diagram up and to turn on your eye diagram.

you've got to go actually into our setup, into your display setup here and then turn on the color grade function and you know if it does actually get quite painful for so then you got your color intensity graded display that you might be used to. So there we go. and now we should be able to start getting the more advanced stuff up. But yeah, it's pretty painful for anything advanced.

But hey, this is designed as a high performance measurement tool, not an everyday use scope. So there we go, we can find out. Stuff like the jitter of our calibration signal on the front panel is around about thirteen point two, eight nanoseconds RMS go figure, stand with the standard deviation hundred and var. there we go.

137 pika seconds. Geez, All right let's go into the self test here and past past, past. Please disconnect all probes. Yadda yadda yadda and start test.

Here we go and as I said I do expect it to pass pretty a to D converter past testing the Phi so past offset DAC Beautiful. We know. Winner chicken dinner Surely now this could take a while. I'll come back when it's done.

Oh wow. Yep, no kidding, we don't Winner chicken dinner. This oscilloscope is like a bought one. So yes, as much as I would like to keep this puppy I really can't see myself using it much I've already got a one gig scope so they go into 1.5 gig you know and it is worth a pretty penny.

So I might actually just or fully test it of course. although I once you pass all those pair on tests, test all four channels just with the basic signal, you know 99.9 percent confident is going to parcel its performance stuff really so you know it is a winner and I can't really justify it. It's because ultimately this is not like and every day you scope it is a the scope you pull out when you want to do a really specialized high performance measurement and analysis and stuff like that because it's just too big and too deep and too noisy. And even though it does have a really nice usable interface front panel if you want to do anything advanced with it, it's just you know, hopeless with the Windows interface and it takes forever to boot.

and well, you know. ultimately I've got at one point I've already got a one gig scope sitting in the lab. that's you know, completely usable. I Mean, look at this right.

It's just all right. It's a much you know, a better, more modern, more usable scope. It's absolutely tiny and you know. So yeah, really, it's hard to justify keeping that I'm afraid.

Oh well. Hmm. And last but certainly not least, a Keithley 2400 SMU I Really wanted one of these. So yep, this is probably a Key Poets paradigm and hopefully she works.

model to revision. see 26 there. And yep, I mean you know it's not like the fancy new model, but hey, if you just want the performance, it's still there. Terrific.

Out front back are terminals of course and I Have no doubt this puppy's going to work. and yep, there you go. That one's good enough for me as an initial test. it's working and yet the current as well.

There we go sourcing 100 micro amps there and he kept pretty darn close. so looks like we have a winner. Now as far as this. Hilla Parker 3 488 a switch control unit.

Here you go. I'm gonna pair it on here. As I said, these are rather, you know these were practically given away on eBay And really, there's nothing fancy in these things. All of these as a but is a basically a GPIB with a processor and a display and then just some.

You know, stuff to select your channel. but it's all about the plug-in modules on the back and it's basically a multiplex a week and depends on the modules that you got configured in the thing. you can actually pretty much switch anything up to like you know, one-and-a-half gig I think you can get one half gig cars to switch RF stuff where you can switch low signal stuff and you know, low noise things and stuff like that. So it's all about the modules.

If we press the test button there and there we go, it's the self-test Okay, so yep, there's nothing wrong with this sucker at all. And as I wouldn't expect it and you can basically pick these up for the cost of shipping. So let's take a look at the back. so this one looks like it has five of the same modules in it and they are for triple 473.

A four by four matrix are switches and this is still actually a current product. You can still buy this card inside this thing for like 1,200 bucks. And yes, all it is is a bunch of relays. pretty much so.

yeah, that's you know, an Agilent price-gouging at its best. So just there you know these things where if you bought them, you would have cost an absolute fortune and use some of the specs for it. There we go. import art like thermal offset Here we go.

Three micro volts for 43 channels per second, relay life ten to the power of eight, 250 volt, two amp per module, eight amp maximum so can you know switch like sixty watts per channel and stuff like that, and open channel to channel five, path and all that sort of stuff. So I'm DC Isolation 10 to the power of 11 which sounds like a lot, but when you put a lot of these things in parallel I've done a very very old video on it that you can really come a guts are there, but there you go in search crosstalk, all that sort of jazz. anyway was take one out and they're really spared no expense on this thing. Look at some shielded, they've got these nice I Don't know if they're custom terminal block interfaces, but you know, like a really quite nice.

let's have a look under here, but like I said, it's pretty much just relays. and there we go. We've got Japanese aromat relays in this thing. High quality stuff.

Got a whole bunch of them so it is a four by four switching matrix. just them. You know, some 7/4 series and some Bart driver stuff to drive these things. So nothing fancy in these things at all.

But if you can pick up a fully populated one of these that you know, like this one that's got five of these cards in it, you know, then hey, that's a pretty good pot salvage. if you pick up these things because they give them away at the cost of postage. Almost. So yeah.

keep an eye out for. And then inside there we just got some terminal blocks. we can attach stuff and look. You can see that there are obviously attach some coax on here which somebody has then just gone.

Now let's rip this out of the system. Don't want to take it apart, just cut the cables. just look inside one of these HP power supplies. Not going to do a full teardown, but they're just beautiful.

The MJR 15 w 3 power transistors here. as it said, look a standard fan there. You can probably just replace that, look at that beautiful transformer and look at the wiring of the separate boards. are using Rj11 connectors to go between boards for control and arts.

Just beautiful. Anyway, Is there a hole in the front? Let's have a look and there's the output connector down in there. As I said look at Wiggles. and yep that is a fault yet that we got some much dry - a broken joints there.

so yet that needs to be fixed up. That's one of the big downsides of this thing. But anyway. I it's just gorgeous building.

Side look at all that look at all that wiring. Oh and yep, check that out down in there. We've got some sort of like a you know, like a keyhole kind of a, cutout for - - big ass binding posts there. I'm not sure the exact you know.

they've got sort of like ears on the side there if you can see that anyway is two of them. They're not quite identical by the way, but yet still. We should be able to just punch out that front there because it's only just the stick on deck or on the front and find a suitable big ass binding poster mount on the front and then just wire it through. Of course, plenty of room just to wire it and solder it straight onto the output connector up there.

No hold on to your hat. Look at that two front panel binding posts. They haven't got the output caps there, but there's no reason why you couldn't take that board out soldering the output caps. Is that out? Put a resistor? I'm not sure what's up, what's going on there.

Maybe that could be a I don't know, a load or something. But anyway, um, yeah, there's no reason why. um, this thing. It was designed to have binding posts on the front, but I cannot say I've ever seen a model that actually has them? Maybe there is, but and maybe it is an official Agilent Er option.

So I'm going to have to do a bit of research on exactly what our binding post will fit in. That kind of connector cut out down on the bottom there. But there you go. It's a design to do that.

and Tada, check it out. I Found the schematic and the service manual which I'll link in down below and I will have to do a separate video on here. But here are the output terminals. he went here.

we go. Here's the terminal block on the back. Those are screw terminals. But yeah, here's the binding post terminals on the PCB Like that and look.

there's those two capacitors that we saw which I'll show you. they're just suppression down to mains earth. They're the chassis. That's the chassis earth symbol there.

And here's the output coming from the big current sense resistor here. and it comes out here. and then. to get to these binding posts, you've got to install these three resistors here.

And otherwise, you don't get anything out of those binding posts. and there you go. You can just wire that in parallel. You don't necessarily need the AC suppression caps because they are already here.

Check it out. they're already. They're going to show zero so you know you could put them in if you really wanted to. but not a huge deal.

So all we're going to do is install those three resistors and Bingo. So there you go the two suppression caps. You can see it's going down to the show Z There there's a screw holding the board directly down to the show. Z So there's those two caps and I have measured that.

This output negative goes through to the negative rail of course. just like it shows on the schematic so that that is connected through to the back terminal. but this one is not. So we have to install those three resistors and I found them and as it turns out, they're all the way over here and check it out.

This is some sort of programming resistor here. I Haven't looked at like option program resistor that's interesting that might be worth having a look at I Haven't read the manual in any detail to find out what that is, but you know it's pretty significant. They've gone to all the trouble to look have different like our part numbers, so maybe that configures you know a model option or something like that? I Don't know. Anyway, here's these three resistors.

so little you know, percent one. So install three of those. but hey, it's going to be good enough for about six amps and that will connect through to the front panel through to that binding pose so you don't have to run any messy wiring like over the top of the board or anything like that. It's already there.

So just take the board out, install those three and Bob's your uncle and check out that four terminal current shunt resistor on the output. There isn't that a beauty made by day or 50 milli ohms there. Yeah, it's only 1% It doesn't have to be a tight tolerance one because they calibrate the thing in software, but you can bet your bottom dollar that one's a very low tempo. And for those looking to buy one of these are internationally then yeah, it looks like it has the voltage selection all built in with all the taps here.

here's all the primary taps, so yeah, that they can select it and the selection switches are Tada. There we go on the side of the unit so you've got to take the top cover off to find them. So there you go I Hope you liked that little look at all this test equipment pawn from auction here and yeah, I'll probably do a couple more videos on this in due course, upgrading the power supply there and maybe doing the odd full teardown as well. If you're interested, please let me know in the clients catch you next time you you.