Hi, You've no doubt seen the Eev blog Hvp 7070 Meg Differential uh pro, but it's been in many videos. I've been selling this on my store for many years. I do actually have it now. have it back in stock by the way, so you can actually get it linked down below.

Anyway, it's one of the best high voltage probes on the market. It's designed by a Taiwanese company called Sapphire and they actually, uh, re-badge their brand under all the top names. I mean, uh, hang on, Hang on. Yep, there we go.

Lacroix Ap031 Differential? Uh probe? exactly? Well, this one's actually uh, 20 megahertz bandwidth My 170. But um, yeah, this is a Sapphire probe. and Lacroix and many other top brands in the industry rebate Sapphire because they make the best differential probes on the market. Anyway, it's not particularly cheap though.

it's you know it's It's a fairly decent investment, but it is a top performance, top quality uh probe. So anyway, um, I saw that uh, Mixig had actually released oh, upside down. all the electrons are going to fall out a, uh that they released their own line of lower cost uh differential probes and I thought, oh, okay, we'll have a squish at them, but unfortunately they didn't have. They only had two models and none of them had uh, the divide by 10 and divide by 100 range which is what my Hvp 70 does.

and I reckon this is better for general purpose use, for lower voltage use on lower voltage switch mode power supplies, or for just general mains use. The others are literally high voltage differential probes they go into like the kilovolt range and stuff like that, which is great if you work on that, uh, sort of stuff. But anyway, um yes, this is common mode. Uh, plus minus 700 volts linear range plus minus 700 volts on the divide by 100 and that's good enough for like a Dc plus Acp.

Anyway, that's good enough. Uh range for like 240 volt main stuff and of course 110 Yankee mains stuff. So more than good enough. So I approached mixing and I said hey, I kind of like the price point of your pro, but can you actually design one that actually matches the specs of the Hvp 70 I.e has, uh, divide by 10 and divide by a hundred mode.

Anyway, they said oh yeah, we'll have a go at it and I don't know. six months later or something it was, they came back and they released um, this which is you can buy it for general sale. Um, and it's uh, it's been available for a while. It's the Dp107 and sure enough has the times 10 and times 100 or divided by 10 divided by 100 And it's um, and it performs pretty well.

This spec sheets I won't bother um, showing you, but they're ident. They're practically identical. Ever. They matched every single spec.

Now, I was actually going to offer this one for sale on the store because it is significantly cheaper than the Uh industry standard so to speak, the Um Sapphire Pros. But unfortunately, when I tested this, it did have a problem with the common mode rejection ratio. The Cmrr and uh, it wasn't even close to meeting its Uh spec and I think some people on the Eev blog forum are confirmed this as well. Anyway, the Um mixing, uh got to work on it and they say that they think they have actually fixed that issue and um, apparently a new model is coming out.

It'd almost certainly be the same number, but it'll have, like, I don't know, some sort of hardware tweak or something that fixes the common mode rejection ratio. But apart from that, it's not a bad probe and I was going to sell it on the store, but because it had that issue, I didn't and I kept on selling my Uh Sapphire my trusty sapphire probe anyway, so people wanted to know what's the actual rating of this thing and that's what this video is about. I thought I'd actually test it because I have my high voltage Ac standard here which can go up to a thousand volts Ac only at like one kilohertz. I can feed in an external Uh frequency, but it only goes up to like a couple of kilohertz tops or something.

So anyway, um, this will allow us to, um, input up to a thousand volts um, Rms into this and see where this sucker clips. Let's go. Oh by the way, it does come with all the accessories. They are very large though.

like you know, like the really high voltage stuff. Not very very useful for you know, getting in there on uh, Pcbs and stuff like that in the giant crocodile clips. Look at that. It's enormous.

So here's the specs for those playing along at home. The Dp-1007 maximum differential test voltage is rated as Dc plus Ac peak and some people on the forum seem to have verified that that is Uh, the case and on the divide by 100 range. We're talking a 700 volts Dc plus Acp. Now of course it's not going to due to the nature of how these things are actually designed and I've done a tear down of the Uh and a reverse engineering of the seven Hvp70 differential probe and this one will the Mix Eagle work exactly the same thing.

They've got a big input, resistor compensated resistor divider network and stuff like that, so it's not like you go over that and you're magically going to blow up your probe. I don't think that is the case. So anyway, we're going to take it up here with our Ac voltage standard and see what's what. And yes, some people have uh, complained that uh, it's not great having the fixed leads on the long leads on the unit like this because that affects its high frequency performance.

And yeah, I agree it would have been better if they had like banana jacks on there. I have asked them about that, but I don't know. They don't really seem interested in redoing it. Um, because they'd have to redo the tool and the casing and the tooling than the whole damn thing.

But anyway, that's no different to the uh. Sapphire probe. So it is what it is so we'll plug that in there and what do we get? Sure enough, we get our 10 volts rm Ac Rms there. so we're on the times 100 mode.

So yeah, let's take it up. And yes, this bad boy can go all the way to 11 Beauty. All right. So we've got 100 volts rms there.

and by the way, the output, uh, voltage of this is going to clip at uh, 7 volts. So there you go. So I think that's what we're going to see here. We're looking for where, at what point it actually clips and when it exceeds that like I like, I'm not going to take this thing to fire.

Okay, I don't even think I have the voltage to take this thing to failure. So yeah I we just want to see where it clips now. Unfortunately, I can't just dial this up like I can change to 200 volts, but well, it doesn't go instantly. There is some settling time.

This thing's all analogy goodness. So oh, and occasionally it trips out like that. so I've got to re-operate it like that. And bingo, we're now at 300 volts.

This is our Rms. Of course we don't. Um, yeah, there's our peak to peak: 800 volts, 850 volts Sorry. 400 volts, 500 volts, 600 volts.

Oh yeah, yeah, yeah, we're starting clip there and 700 volts. You can see that we're clipping right? I'm going to take this sucker up, so let's call it. Let's call that clip. Oh let yeah.

that is definitely clipped. You can see it's clipped. so it clips at like 500 and 560 570. It just happens to be right on the edge there, doesn't it? 580 590.

Let's say it can go up to 580 volts before it Rms before it clips 590. I'm pretty sure that is clipping and it's giving us an overload flash there. You can see that it's actually flashing that it's overloading. So it does have a clip indicator that's really very nice.

Now let's go back to 580. Not still. It still thinks it's clipping 550. Still clipping.

I'll find the point where it stops, turn the studio lights off a bit. Okay, we're solid. We're at 420, 430, 440, 450. Just wait a bit, Not 460..

it did seems to have a hysteresis because it had it only turned off when I went back down to 420. So ah, 470, There you go. So 460? Oh no no no no, it's good. Ah, that was just the uh.

settling time Is that was just the output settling time So 470 Rms? 480? Yep, Okay, so let's just I'm not care if it's 475 or whatever. Okay, round about yeah. 470 Rms it'll go up to. But we saw that we still got well over that on the voltage here.

So let's go up 580. It was another another 100 volts rms before the actual output waveform clipped. So that's interesting. All right, I'm going to take this sucker up.

I think I may have actually done this, But 600 volts, 700 volts Rms? Okay, 800 volts Rms 900 volts Rms. A thousand volts Rms. We're not blowing this sucker. I'm going all the way to 11.

Here we go: 1100 volts Rms. As I said, yeah, you're not just going to magically blow it. No problems whatsoever. It just clips so it still works and take it back down to 500.

And Bob's your uncle, no worries. Oh, by the way, of course there could be some degradation in the performance with frequency as well. So this is only at one Kilohertz obviously, but it just shows that you're not going to blow the ass out of the thing. Oh, by the way, I've just put the probe back to one to one here so you can see the actual output voltage.

You know how it said, uh, seven volts maximum output voltage? Well, yeah, we're actually a plus minus seven where, uh, 14 volts? Uh, peak. So it does at least do the plus minus seven. So we're at 500 volts Rms by the way. and if we go up to where we clipped which was 580, wasn't it or slightly under that 16 volts.

So and then we start to clip. Once we get above, that's 590. So 580 volts there. So yeah, it'll actually go to eight volts instead of the seven.

So that's actually over spec on the actual output voltage going into your scope. So there you go. I hope I've answered, uh, that question. This is just like for basically the forum people who are commenting on this uh particular probe.

and as always, the Ev blog forum the number one destination for test equipment on the entire interwebs. I'm telling you, if you want to talk about test equipment, it's a place to do it. There's even a test equipment anonymous. Uh, in case you've got you know, psychological problems collecting test equipment, which is quite common anyway.

Um, yeah. Evblog forum link down below. uh for this particular Um probe anyway. but yeah, it's cool that it gives you like an overload indicator there.

Flishy, flashy, but it's at like 470 or 480 volts when it's actual output clipping occurred at 580 volts. So and as you saw, it survived up to 1100 volts Rms. No workers, rubbish. Everything has user serviceable parts inside it.

All right. I can't finish this video until I open the damn thing. I'm not sure how though. Ah, sneaky bastards, There's some trimmers under there, even sneakier.

So here we go. We're in. I've got a metal shield covering the input section and the two input high voltage resistor strings as you'd expect. so once we flip that over, I expect to see a whole whole bunch early through.

Oh, probably Smd jobbies all in series and maybe some compensation caps across them. Just like in any high voltage diff probe, this looks like our output driver does it. We've got our buttons on the top with the Leds there to light them up. And oh, by the way, the strain relief.

It's pretty good. That's not too shabby at all. And your metal threaded inserts everywhere. There's five screws to get this thing off.

There you have it. Got ourselves a Dc to Dc converter there. No surprises whatsoever. That's an isolated jobby that's an O5 of 12, so that'd be uh, 5 volts in and plus minus 12 volts out.

isolated. Of course. That's how you get your uh, plus minus seven volt or eight volt as we've measured. Swing on this thing.

Got a regulator up there and uh, that stuff on the bottom. That's got to be additional regulation as well. That's not part of the output drive because the output driver comes from up here. There's our output termination resistor and what is that? Joby? There you go.

That's a Ths 3091. That's a high voltage, low noise current feedback Op Amp. Now your standard uh Op amp rubbish current feedback? Uh Jobby: Really high bandwidth that'll do up to 200 megahertz at a low gain, of course. Um, so what's the output gain? Maybe 10 or something? I'm not sure.

Anyway, that's certainly a suitable output driver. We've got ourselves a fair income relay there. No Wakkas made in Japan. All the best stuffs made in Japan.

although the probes made in China. So there you go. Go figure. Anyway, Um, yep.

here's our differential amplifier. There's our differential amp a Th Sr4631 That's a high-speed Fet input Op-amp So we've got a couple of trimmers there, and a little ten turn. Jobbies got a couple of variable caps up here. Of course, at this point, you expect to see complete symmetry.

So in the two variable caps up there, as I said, there's your high voltage string there. There's your caps for each run. The reason that they have to use separate resistors. because each resistor is only like, you know, 200 odd volts for that package size.

I would have expected a larger package size than that, actually, so I don't know. It's maybe a bit how you're doing Anyway, you saw it. It did actually survive. Uh, the voltage.

So no workers? Um, and yes, as I said, uh, capacitors on there to uh, compensate. But uh yeah. Actually, what is that I can't is that four meg like the I think the sapphire ones for me. So yeah, that's exactly what you'd expect.

Um, it's just that. Yeah, I'm surprised not to see, uh, larger packages there for bigger voltage offset. Anyway, there'll probably be some diodes in there for protection as well. Is there anything on the bottom? No, I don't.

Actually, are they probably relying on the input clamping of the Op amp. I would say because I don't see any deities in there, do you? And that micro there? makes sense. It's another one of those busy bees that we saw in the uh, previous video with the mixing current clamp. Uh, the tear down thingo.

So yeah, that makes sense. You kind of reuse the uh, same family micro within. you know, most of your products where it's suitable. Anyway, there's not much else around there.

that's about all she wrote. Really. So there you go. It's got a differential high voltage input string, differential amplifier, output, current mode, op, cable driver, and just some control and miscellaneous stuff.

And Bob's your uncle so they have it that's inside the Dp1 007 high voltage differential probe. as I said Ev blog forum link down below to discuss this thing and I'll keep you updated if I ever put on the store if I get the like updated version with the common mode rejection ratio and I'll probably do some tests on that to confirm. So anyway, if you liked it, give it a big thumbs up. comment down below.

Catch you next time you.