Probably the CMRR upgrade will be a tweak to the resistor values in the instrument amplifier, probably with either a select on test bodge resistor put in, or with a tiny pot stuck in the middle there to do the adjustment for the resistors being not ideal. Yes it looks nice, and of course the little microcontroller there, though I would say it also has a built in ADC that is being used to sample a rectified sample off the output, to flip the power and range LED to flash when approaching overload, and nice there is still headroom when it starts to flash clipping, so your measuring will still be accurate just before. If you selected 1199.9 you would have a higher output off the amplifier......

Hey Dave how about a tear down and analysis of the Gigabyte power supplies that are blowing up?

Hi David Just received my 2 differential probe and current sensor. That was really fast shipping, ordered it 19-08-2021 received it 24-08-2021 Grate work, looking forward to trying it out 😎

Nice to see you testing Micsig gear.

There is a frequency compensation made by R121 and R122 and two capacitors made by the pcb itself and small square copper pads. These RC networks are in parallel with R16 or R75. They are not used because these resistors are not fitted but it is a nice design.

Episode 1414 incidentally featured phenomena related to the square root of 2. Well played.

Dave, you missed the perfect opportunity to include the "These go to eleven" scene from Spinal Tap 😉

I have a couple of the Micsig 5kV probes and they have been very good, felt it was a bit of a punt at the time as they were a lot cheaper than others but they have lasted through a few over voltage events and I like the probes.

Glad to see it works well… I wanted to use it for frequency drive output examples so the cmrr and frequency capabilities aren’t that important to me. I bought the 1300 volt version. Great video!

I will always be a fan of Mr Wu's probe.

of course it turns off at 420

"It’s Such A Fine Line Between Stupid, And Uh… Clever"

You little beauty Dave... I think my Oz speak is good. I've been looking at the Dp0007 as it's about what I can afford. Great review but I might just hang on now and see if they fix the common mode rejection issue before I put my cash where my mouth is. Thanks again 👍 Oh, ps, I'd have bought your Sapphire probe but I'm guessing the p&p would be a bit of a problem as I'm in the UK 😔

Now that Photonicinduction is back doing videos, maybe he could help with finding just how many kV it would take to kill it? He's a top bloke, one of those who would take you home from the pub to melt a knife in his attic. Really into engineering, destructive testing more specifically.

That is very odd. The inside of their other problems reviews a very different differential amp ICs. I was expecting them to re-use that design and just change the divider.

At 12:10 the centre wire of the scope connection shows it is not up to a lot of vibrations or it will break.

Hello Dave, is there anything new about the µSupply yet? I can hardly wait (TEA:-). The last video (#1282 - Design Your Own Membrane Keypad!) is already over a year old and it looked quite finished.

GooD SHoW. VERY partial to Sapphire/EVB... but I do like to see the utters in action periodically.

I have that same probe but the case is yellow and it’s a different brand. It’s not really isolated, I think they use 1mohm or 10mohm resistors or something. 4 AA cells.

How does the DP-20003 compare with the HVP-70 in terms of performance? Seems that’s the one to get with the highest voltage range and would be cheaper than the saphire still.

Please do a video on the gigabyte PSU blowing up, you can find information about it from gamers nexus

It wouldn’t cost that much to modify the injection mould to have different input connections, it’s a pretty simple change in that case, a bit of laser welding on one half to fill the existing half shell hole and a couple of round inserts in the other half with a sliding block to pull them out before ejection … my guess would be about $5K to do, along with a minor PCB change to fit 4mm jacks.

Still alot of people complaining about the 2 test leads. My guess is that they (at least partially) avoid the shrouded 4 mm banana sockets for safety/compliane reasons. It would essentially just lead to tempting people to plug in their unshrouded banana jacks and asortment of clamps that could easily slip off during probing exposing 700+ volt contacts. By having the leads already attached they kind of prevent that (unless someone goes out of their way to do dumb things). Having 2 leads and HV probes is also probably easier to get through the various CAT specifications than trying to create a "proper" probe that qualifies for 1000V. The Ground will always be akward to use in such cases, so going with 2 probes and the diff. amp. is probably the most practical way here. I know there are some expensive manufacturers that do it nontheless, but I kinda question the use of it. Since these definitely appeal to hobbyists as well, I think this is a rather sensible choice, since their main purpose is probing safely anyway.

Looks like the leads are suitable for a bnc replacement!

What I want to see is the DP20003 tested. It says it can do +/-5600V on a 2000x divider (output voltage +/-3V), but the common mode is specced at CAT III 1000V - how does that work? Even on a differential sine wave that would require 2kVrms on each input. Unless the limitation is simply thermal and it can measure 5.6kV pulses that are

I picked one of these up a while back (had some amazon gift credit) but I haven't used it yet ; to much of a noob for that high voltage stuff.

Hi Dave .... did you re-solder the red lead part way through the talk, just after 14:14 in as it did look a bit how youdoin prior to that.

Put the scope in fft mode...should be pretty obvious when it starts clipping.

Give this probe to Photonicinduction guy :D

Those electrons are a nightmare to pick up if they fall out

fundamentals Friday on CMRR when

Is test equipment anonymous lead by Mr Carlson ?

Just wondering... Wouldn't it be possible to determine the clipping point by using the spectrum analyzer of your scope and looking for the point where the higher-frequency "noise" starts to creep in? Might be more sensitive than eyeballing the peak flattening of a sine wave, but I just don't know...

I guess I own this as a "it's my problem" thing, but I had to rewind through 6:30 three times before I figured out that "full-ya" (as in 'test it to full-ya') was Strine for "Failure"... !

At 9:12 you can see that it actually clips at 7V RMS.

wow... that's cool...

I like your video

Do you like that Keysight scope?

The giant alligator clips need a small googly eye on the hinge. :)

if you are checking for clipping, why not just analyze the signal in FFT, and check when you get noisy stuff??

Send it to Photonicinduction he would test it with 11KV :D

Hmmm am I the only one hearing a constant tone in the audio.... (Seems to be at the beginning at least.)

why not just make 10 louder?

Goes to 11. Wow. That's a lot.

This worked to eleven?

Sent it to photoinduction and he can test it real good

am electron I fell off 🥺 1:03

Is one louder

Out of stock sale continues?

(10:36/)10:49 - do they talk, as some photographers I know do, about having “gas” (GAS - Gear Acquisition Syndrome)? 😁

Hello Dave! How's Australia

Looks like you don’t have the volts to drive the diff probe to failure. That motherboard, though, is a different story. Crank it to 1,100 volts and put a 20 GHz crystal in there and overclock that bad boy… for all of about 1 picosecond! 🤣😝 If it’s worth doing (on video), it’s worth over doing! 😏

Turn it up to 11: kzfaq.info/get/bejne/at6Xq5ecnZneqpc.html

Yes..11

Why don't you just make 10 louder?

Will he do a face reveal? I think i got a glimpse of his face in a reflection somewhere around 12:00

Sure seems like it would be easy to modify the case to accept banana jacks and not have to touch the circuit board at all.

are my speakers fucked or are you only using the left speaker

clickbait

Its 120 yankee volts .None of this 240v penal colony rubbish