100x High Voltage Oscilloscope Probe Test and Experiments (P4250)
ฝัง
- เผยแพร่เมื่อ 10 มี.ค. 2022
- Let's test a cheap high voltage oscilloscope probe from eBay, marked P4250, let's do some experiments and explain how does it work. It has a 100:1 division ratio (also called 100x or x100), 2kV voltage rating, 100MΩ input impedance and 250MHz bandwidth. There's also a P4100 version with 100MHz bandwidth.
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The concentric circles on the probe advert are hilarious
that really made me LOL a lot
Imagine you got a 30cm probe and 5 useless circles of coaxial cable
Can we all take a moment to appreciate the work this man is doing to educate us about electronics? Man thank you very much!.
Agreed, always something to learn from every video, be that taking apart a flyback transformer core with a hairdryer, being told to compensate probes for each oscilloscope (something I have never heard once in nearly 3 years at uni), or adding copious amounts of rosin to fix all problems. Cheers from me too, Dan.
Yes! Like,
CHINESIUM: a unknown metal like substance made from dubious materials and of highly questionable quality - possibly a bio-hazard and guaranteed inexpensive - hands do need to be washed after contact - current pricing is 1 cent /per ton. Classification = Hazardous.
Cheers GENIUS. Live Long & Prosper
He's a genius and has the coolest collection of coldwar Era soviet displays I've ever seen
Spam comments
I so totally agree with your comment. DGW has taught me more about the workings of electronic circuits than any other teacher. Watching him draw out circuit boards and dissect them, showing their strengths (rare) their weaknesses (often) an making suggestions for solution/improvement is always worthwhile and educational.
I've been using oscilloscopes for over 40 years, and only just now did I learn that the plastic cover over the probe's earthing point (time 3:17) can be removed.
Not sure they're necessarily _intended_ to be removable; I destroyed a (fortunately fairly disposable) probe that came with my Rigol scope trying to remove that sheath. My instinct is that they're meant to stay in place and provide a high dielectric between the hand and the probe's ground shield.
Technically the whole probe could be disassembled but what was performed there is not supposed to be done unless you're repairing or building your own custom probes. Even though it was easy that it's lit off it might not have supposed to been. There was glue under it they just didn't do a very good job
The reason why the metal sleeve of the probe looks odd and manky is that it is covered with clear glue. The outer black sleave was glued on, though not very well in this case.
Oscilloscope probe coax cables are very special. They are called intentional lossy because the inner core has a pretty high resistance. This goes back to a famous Tektronics invention long time ago. It allows for high impedance probing in the first place having reasonable bandwidth. It increases the termination impedance of the transmission line.
at 14:50, the resistance measured is the one of the cable itself: its purpose is to dampen the reflections that will occur at the end of the cable. Dave Jones aka Eevblog produced a interesting video on that matter
you've read my mind with this video! just recently jumped into electronics, grabbed an IWATSU oscilloscope from my fathers basement, but without probes. had to jump into researching what is what and who is who, asking shops and such. ended up ordering similar probes and started playing around. anyhow, you have your lousy but yet very much technical style, and since i bumped into your videos, i have higher expectations towards others. keep it up!
8:49 This is the most concise and thorough explanation of probe compensation that I have ever seen on TH-cam.
I bought a pair of these a few years ago from Amazon, but never glanced at the manual. Up to 30 KHz at 2000V? They certainly understand the modern market for passive high tension probes, which is primarily audio valve amplifiers. I'd feel comfortable probing the output valve plates of a Bassman, Plexi or SLO with these probes.
Getting up that high I'd recommend jumping to the 5kV chinesium scope probe, which at least looks like an actual piece of HV gear.
Altitude specifications are not uncommon in higher voltage gear. Reason is that the air gets "thinner" (less pressure) at high altitudes and the breakdown voltage of air decreases. If the first resistor inside the probe has a certain length to withstand 2kV/30kHz at sea level it may arc over when the dielectric strength of the surrounding air decreases.
Всё наоборот.
Agreed 💯!
@@SeregaTikhonov ты дурачок?
The eplanation as to how to "tune in" a probe was GREAT.... thank you.
8:35 That is the best! I didn't actually notice it at first! Priceless! 🤣
Congratulations for the new probe and the oscilloscope! You reminded me of the days when I was in Germany, I bought once three of those from the Flee market (very similar) and as I had little experience then, I resold them in ebay for 10 - 20 Euro each.
I have bought similar 1:100 probes from eBay and was also pleasantly surprised by the working of them. Use them all the time for measuring in SMPS and Ultrasonic equipment. You still need and isolation transformer of course on the SMPS under test.
They're nice if you have a couple of disposable oscilloscopes around. I bought a total of three of these and destroyed 1 Channel of an old Hameg(412?) Scope and both Channels of a Tek 466 with them. The third one just broke and stopped working after using it for less than an hour. So yes, they do work, just don't try to measure anything reactive above 800V or so, but maybe I just had a streak of bad luck. According to a known good HP probe and a 1 GHz Scope the peak never went above 1.2kV, so I'd take their specifications with a cube of salt. I'd rather pay 200€ for a probe that won't break my scope.
"Chinesium"? Now that was worth the price of admission right there :)
Another great video, thank you we apreciate your hard work
Great explanation, I completely missed the circles of wire, shows that you shouldn’t believe a thing the advertisement says, test then believe. No high voltage tests, I was waiting for those, can it really measure 2kV safely and if it’s a high voltage spike, I guess the bandwidth will attenuate it or will it pass it through to the scope. Maybe you can connect it to your Tesla coil, that looked like a nice high voltage test ;-)
You know, testing it to breakdown would kill the probe, and you would have to buy a new one. But if you don't trust the build quality, then you can't trust one test to be valid for another one.
This is the difference between QA and QC. With quality assurance, you build in the quality into the production, minimizing the possibilities of fault at every possible point starting from a raw material entering at the gate to the finished product leaving the factory.
With QC, you are just checing that the finished product meets the test criterias or not. But it does not indicate whether it just meets, or it just not failed (then it will when the box arrive for the customer) and does indicate anything only for the KNOWN problems you test against.
QC without QA does not guarantee anything.
I have to say, HV is not a joke. My life and my scope worth more than a cheap questionable probe. For an 1X or 10X LV probe... Okay. Characterize it and use it. But for HV...
There are better brands, for example I bought a TesTec TT-HV250, 300 MHzc 2.5kV. Listed on $51 at TME today. Is it that unaffordable?
Nice too see a vid. Was starting too think you got bored of it lol. Always like your content.
What I love about my tiny Tektronix 224, it that it's probes are isolated from ground and from each other.
I don't have to worry or use isolation transformer.
Although the scope is old and only 60 MHz, I love it and find myself using it a lot more than my new Hantek DSO4182C Chinese crapola.
I use that crapola when I need its 50MHz built-in function generator.
Very good! It's delightful to see how much more you have to tell beyond Chinese SMPS.
We need advanced electronics videos!
excellent vidéo as always
Love the concentric circles
Great information and review. Glad I'm not the only one amused with badly photoshopped product pictures. I have a folder of ones I've collected. 😂
18:15 this is when I realised you accidentally had the standard 20MHz bandwidth limit on both channels, it happens. 20ns was an awfully slow rise time for a 74HC part and for a x100 probe
Nice video for those who want to buy an oscilloscope probes
Great Videos 🙏🏻🙏🏻❤️❤️👍🏻👏🏼👏🏼
The look on your cats face describes how mad i get trying to understand calculations lol :-D
My old 10x probe always needs adjusting, im sure the trimmer cap moves on purpose to annoy me lol.
You can make a surprisingly fast rise pulse generator by avalanching a BJT, some are better than others but even a 2N3904 is sub nanosecond. Usually looks something like a high value resistor charging a cap of a few pf connected to the collector, signal is taken across the 50 ohm emitter resistor, base is pulled down with about 10k. You can add a flat top by replacing the cap with a coax stub to act as a delay line.
Thats right! In the early 1980s as a student project I developed such flat top pulse generator to drive one of the early high power pulse laser diodes with 10A current. A lot of coax cable was used in parallel. It was staged using four such generators in parallel. Synchronisation was somewhat critical.
Very nice video 👍
For a very good rise time generator you should have a look to avalanche transmission line pulse generator.
14:40 Good quality probes use very thin steel wire for the inner conductor of the lead to minimise the capacitance and so have a relatively high resistance.
Love how his cat knows all.
Its the cutest cat I have ever seen :)
I remember seeing a review of a similar ebay purchased probe a few years back and the person doing that found inconsistencies between allegedly identical probes (e.g. Same manufacturer) from the same seller, something to watch out for.
There are not too many cheap scope probe reviews on TH-cam, there's one from about 8 years ago where the reviewer had doubts the probe could reach it's specs. If you search for "TP6100 "100 MHz" $9.00 SCOPE PROBE REVIEW" and you should find it, however a later video on the same channel (ElectronUpdate) is the review I remembered, it's entitled "Cheap Scope Probe Frequency Response" and still worth watching as it's something people should be aware of.
Could you possibly make a HV Test with this probe?
Possibly with a microwave transformer and CFL inverter?
I dont really get why the voltage rating of the probe goes down with frequency, the capacitors or resistors wont heat up so I would assume that the probe would simply draw more current from the probing circuit but it shouldnt cause a flashover?
Am I wrong? I havent found any good data on this. I was planning to get such a probe but i am a bit suspicious off it, I mostly built vacuum tube gear so such a probe would be very nice to have, especially for that low price
Could you please test their voltage ability? I got one and it seems to have stopped working after testing a 1800 volt power supply. The signal became all round.
altitude rating is because of the high voltage... planes with magnetron-based radars regularly use pressurised waveguides, otherwise they'd arc all the time in the lower pressure
Try 'scoping the collector of the line output transistor in a black and white television, it should be a good test of a x100 probe without enough energy to cause any damage.
Thanks.
The x100 probes stop working. For voltage-noisy investigations I now use a vintage valve scope where I could feed the signal directly to the Y plate...
Thank you
Maurits Cornelis Escher .... That's some reference man !
Is that Larry David moonlighting as DiodeGoneWild...🤣
Have you considered opening one of the Xiaomi fast chargers for phones (67w or 120w models), they seem pretty compact for those powers, it would be nice to see the topology used.
The main lesson is to listen to your cat
I want to ask a question
Can i run both filaments in a car lamp at the same time?
Brilliant :-)
Hey Wild Diode, you got an EE degree? Where do you work?
6:53, this may be supposed to be just a review, but this I why I came anyway ;3
nice, I have a pair of those 100X probes from aliexpress and they work great, I mainly use them because I feel more confident that a voltage spike wont destroy the oscilloscope, like when I power a 12V relay and when de-energized the relay, the coil spites a -300V spike from the collapse of magnetic field. Only switch to 10X or 1X when measuring really low voltages or when fine precision matters. They combined with one of those small portable oscilloscopes make a great tool to check electric stuff like UPS and power inverters on the field.
... flyback/freewheeling diode??? ... jeeez
needs some time to turn on, maybe that s what he is trying to measure ;-)
I bought probes with similar specs from Hantek and tested it with 60Hz with a hipot tester. It shorted out just below 1kV AC. You must not believe the voltage specs of these Chinese things. Be careful! I got a pair of them and threw away both right after the first one failed the test.
Why do radial inductors sound in circuits, any help ?
Thank you! A fantastic in depth look at what is so often forgotten when it comes to using a 'scope. I personally made a purchase of the 4ch GW-Instek MDO2000 series 'scope & i have found myself using my old early 1980s era Tektronix probes simply because the trace looked better! Now i am going to have to recheck what is truly happening & why.... (a mistake on my part no doubt).
"Nice" Tektronix Scope 😯
Not dodgyyy at all!
Excuse me, can you tear down UHF microphone and draw schematic about it? Thank you very much
What is the name of Your new friend at: 6:58? :)
You should test your new probe with MOT + variac to be able to see maximum voltage the probe can handle
Can it handle 2KVpp?
the grounding wire is incredibly short making it very difficult to use
7:00 little bug walking around on the scheme
I thought it was on my own TV screen at first
This oscilloscope probe made from chineseium is actually good and meets its specifications? You have to be kidding me guys!
Certainly less expensive than active probes for my Tektronix TDS 540. It has the funky TekProbe-BNC connectors, which seems to drive the price for active probes truly stratospheric -- and the 'scope has four 500-MHz channels. Not really into "black magic" territory, though I suppose it doesn't matter if I can't afford to play down here in the dirt anyway, i.e. sub-GHz frequencies.
nice
*"Chinesium"*
Amazing
Dude I become a fan of his accent
New element
"Chinenisium" !!!
Nechcete natáčet i v Češtině ? myslím že by se našlo hodně lidí z česka co anglicky neumí a hodilo by se jim to .
Are there any good cheap differential probes?
If you mean HV differential probe then yes, Micsig has a lot of different models at a reasonable price.
niiiceeeeee
Why do you waste your time with other scopes when you have that beautiful Tektronix?
I'm surprised you haven't made a DIY function generator!
You should. If you have a phone with an old school earphone plug, there are some kick-ass function generator apps for both Android and iOS.
74AHCT14 Hex inverting Schmitt trigger IC is a great IC to have around if you want to generate fast and sharp transitions. I think t-rise or t-fall in under 5ns.
if anyone knows a faster rise and fall time of a Schmitt trigger IC, post a reply with a part number.
I remember there is PO74G14A (tr = tf = 0.8ns) but I do not know if it is still produced
I bought a 100x for mains measurements too. I was not comfortable to use 10x and maybe destroy my expensive oscilloscope….
Do you really need high voltage for a colonoscopy?
👍👍
That metal looks like zinc or something, looks very cheaply made but at least it seems to work after your repair!
It is called chinesium you can google it to find it out :D
@@MarcoPolo-zv1ft aka 'Pot metal'
Right! No more Russian oscilloscopes! If there will be opportunity I propose to make a video on SDS1102. Am preparing to buy it. Thx!
i can see that you are seeing on screen and teaching
of course😎
I tought that theese probes consist just of a simple 2 resistor voltage divider...
Black Magic :-DDDDD
Looks like you can use it to 2 kV up to 40 kHz...
Ahahah....🤣🤣😂😂......Chinesium.........a new element from the periodic table....!!!!
Chinesium 🤣🤣🤣🤣
From eeeeebaaaaaaay
6:59 there's a bug on the paper
LMAO 'Chinesium'
haha , Wireless Energy transmission done wrong via Photoshop @ 8:42 = Chinese guy/girl you had one job & you failed
Let's talk about his accent. ...
Any suggestions?
Crash Test!?.
Dany. You should make a set of differential probes out of common components. A cheap set is 300 in Canada. Micsig ones. They seem great for the price. You should hit them up for a scope and probes. Perfect for your content.
I see alot of dingbats getting them for review and they never use them again. Look at defpom, hes turned into a gear review channel. I offered to buy an lcr meter off him for retail as i was buying one anyway and he has like 8 lcr meters and the guy was a total dick.
Engineering channels turn into home shopping network advertisments after they get some subs. They get greedy. I donate all the gear i dont use. I sent packages all over north america for free, no strings attached.
You shoukd be a millionaire off your channel unlike electroboom who makes crap content.
Great Scott is the worse, his smug german 'im better than you' attitude and belittling his viewers saying they cant afford the gear he has. He got it for free. He started playing guitar the past few years, i suspect he knows 5 chords. Ive been practicing to a metronome my whole life and dont learn cover songs as a matter of principal.
Sorry for rambling but the state of electronics engineering channels is horrible compared to real engineers like you and a few others. Im going to send you an expensive multimeter after xmas. I have a flir dm92 i dont use. You can have that or the bm786. Ill even include a set of probemasters and a mixure of other things. Microcontrollers and leds and such.
it looks like a siglent clone
Are you interested in selling me your cat?
are you kidding me guys 😁
i can see your blad head on CRO cathode ray oscilloscope
No need to be nasty, a lot of people have hair loss.
God made only a few perfect heads, the others he covered with hair .😏😏👴👴
@@zx8401ztv Agree, unnecessary comment.
@@brucepickess8097 Ha ha mine is vanishing so i could be getting smarter, Not lol :-D
Why do you speaaaaaaaaaaaaaaaaaaaaaa ke like thaaaaaaaaaaaaaaaa at ??
Why the need for a personal question delivered like that ??????😡
@@brucepickess8097 Cause I am really baffled as to why he speaks like that I mean I am not a native english speaker either but this is beyond accent he basically sings lol what native language would make/force someone to pronounce english like that? lol
@DiodeGoneWild Please look through your mails. (Maybe in the spam folder...)