EEVblog  

So many times I accidentally left my probes in 1x, and my scope is set to 10x or the other way around. And I sit there looking at my circuit thinking something is really wrong then I realize it's just that.....

Great video and I love your probe collection. I have found that X1 attenuation instead of X10 can also be useful in high EMI environments because the lower impedance makes them less susceptible to stray fields. Look forward to seeing part 2 of this series!

I've been beating my head against a wall trying to justify spending $400 on an oscilloscope, and here's Dave casually using 2 x $15,000 scopes and another worth $2000+. Thanks Dave ... I needed that!

About that 1k resistive probe: One of my professors who spent his career doing high-speed analog stuff and who started in the 80s (when the access to proper, professional equipment vas very limited over here) made a couple of those probes. He based them on a piece of stripline on FR4 in a plastic syringe to get something like an actual probe (with a very short ground lead, I think he used a thin nail or a needle for that and for the actual probe tip) with the coax attached to the other end of the syringe. So, anyway, he recommends: -putting a 100-120nF cap right after the input resistor(s) to stop the probe from loading down the circuit at DC (because if you're using this probe you probably don't care about DC) -if you care about having 20:1 and not 21:1 nominal attenuation, using two 0805 resistors in parallel so that they add up to 950Ω (like a 1k and an 18k) He claims that the plastic syringe version has a bandwidth of around 1GHz (he used it with a 500MHz oscilloscope), but a better one made with a brass tube instead of the syringe had a bandwidth of around 2.5GHz, limited by the (fairly elastic) coax he used. Any comment on the use of those caps to limit DC loading of the circuit, Dave?

The restive transmission line probe is my favorite way to make a built in high speed test point. Because of cell-phones there are some absolutely TINY coax connectors. Many are less than 2.5mm on a side. Add a series resistor and you've got a GHz bandwidth test point for 30-60 cents in < 10mm^2 that securely hooks to the scope with a $5-10 of coax adapters. Easy to AC couple the test point as well, just "tent" a resistor and a cap in series.

Greetings from the algorithm 😂👍

Love these educational, tutorial and guide type videos. Here's a comment for the engagement. Keep it coming!

More videos like this please! Been missing your tutorials and equipment demos etc. Keep up the good work!

Excellent video Dave, thanks.

excellent tutorial as always :) keep 'em coming!

KEYSIGHT. Eevblog has come a long way from Rigols. Congrats on your success and an amazing channel, Dave.

This was great! Learned a lot

Great video. I found this very helpful especially for a beginner hobbyist as myself. Look forward to part 2 and more interesting discussions. Thanks.😬

Thanks Dave. Good explanations and I'm sure a reference I'll end up coming back to.

Great vlog, nearly everyone, including me (noob), concentrates on the scope settings to solve issues. I remember you showed the special squiggly wire used in their construction. Always to go back to basics, or advanced for me. Thanks for sharing.

Mighty awesome, I loved it! Very informative.

The awesome crazy Aussie guy. Keep up the great work bud

Great summary!

Good video, glad to see some of the older style content back.

I like this topic! When I see it I knew I'll love it!

With a 10X probe and an analog scope with a best volts/div of 5mv it is not much fun trying to measure DC ripple! I use an old analog Hp 412A chopper circuit meter which goes down to 1 millivolt FULL SCALE. It is a lovely, amazingly accurate unit with six ranges below 1 volt! Hypnotic to watch that needle dancing back and forth.

(as a relative newb here) I love these videos that tee off a full day of Dave videos in the links 😸

Great video.....Thanks !

I like your EEVblog HV probe. This time 20 years ago I'd've sold my Mother for one of those for a testing/measurement job we had to do at very short notice. I might even have included our cat and next door's budgie if somebody had promised next day delivery

Pro tip: wrap your 1/10x switchable probe with duct tape. Hooray, it's now a fixed 10x probe!

Helpful video 👍

Impedance of a terminated 50 ohm coax is a flat 50 ohm resistance (none of that 100pF bollocks). I recommend using another 50 ohm resistor at the input of the coax to dissipate any reflections scope termination might have produced (that will halve the gain, though) and add a good quality dc blocking cap. No need to build a new cable, just modify an SMA connector and screw it into any SMA/3.5mm cable.

Coax transmission lines, Dave you're approaching the territory of RF woowoo magic!

Only a half an hour long video? And here's me prepared for a 2h long marathon with a bag of popcorn ;)

You may have missed one, I have found it useful to have a diode RF probe that can be connected to the oscilloscope. Very handy for looking for modulated RF signals on a limited bandwidth scope.

Hi Dave, great video! Waiting for part 2 and review/test of Micsig DP10007 which you teased a few videos back, wanna see is it any good

The ones with the red attenuator switches have their 1x setting when pushed forward. That can blow your scope (mine is 250V max.) when you want to measure higher voltages, because you can put pressure on the switch while measuring, and you will push it from 10x to 1x. I have just removed the red knob (you pull it off easy) , and use a little screwdriver to actuate the switch now.

Thanks - this is great.

From my learning about amateur radio coax versus ladder line, you cant expect the shield to fluctuate with AC. It should be tied to ground and the centre pin should go positive and negative with respect to it. With separate conductors EG ladder line, both conductors can go positive or negative. Hence the need for a balun when going between conductor types..

21:10 In analog scopes, you always had to calculate the voltage manually and no one was complaining.

Now we need a tutorial video on how to properly build such a home made times 10 high frequency probe... :-)

Fantastic!!!

A couple years ago Rigol had the best bang for buck in entry level 4 channel scopes, now there are so many new affordable scopes on the market and I wonder which one would be the best bang for buck (with the least amount of annoying "features"). I think there is room and demand for such a comparison video every 5 years or so.

Hope your recent community posts boosted your page!!!!

Very good video…

First time I got an add from youtube to pay them money to not see there (or other) ads.

I just wanted to link that one video but can't find it. Its from I think a tectronix guy, greybeard, who goes into a lot of intresting details about divider probes and how you have special lossy coax and all sorts of things to increase the bandwidth.

Is this the new camera? Is so fast and precise on autofocus!

Does the attenuation from the finite bandwidth of the scope combine with the attenuation of the finite bandwidth of the probe to get something lesser? Like stacking filters?

You can also make a differential isolated AC-coupled high bandwidth DIY transmission line probe. How you ask? Connect a cheap ethernet transformer to the tip of your coax. You can even get some spectacular impedances by using other turn ratios than 1:1 in combination with suitable resistors.

Most of the time, looking at high speed digital signals is best done with a Z0 probe. I call them a "cable launch" probe, but that's just me. You can even look at things like Gbit/sec LVDS with them, and they cost (basically) $0. I previously did a little analysis with SPICE just to see ground lead length and the effect of the capacitance of common resistor (physical) sizes do to the frequency response... and the answer is it basically doesn't matter. Another thing that is useful to do when designing the board if you know you'll need to probe for example a high speed SERDES interconnect is to put some pads there for a 0402 size 953ohm resistor and a ground via close to it :) For cables 1/10w 380ohm in series with 570ohm makes for a 20:1 with 1/2 the parasitic capacitance of the resistors.

Who needs probes? I just slap the circuit against the inputs on the scope....no probes needed! 😂😂😉

Totally off topic but I have to say your voice is very similar to Shirley Strawn's of Skyhooks fame. Keeps me listening because it's as if he lives on but now as an electronics enthusiast! Cheers

I wonder how LMR cable would be for diy probes. Very good for ham radio antenna connections

The standard probes that I got with my RIGOL DS1054 were so poorly made that I had to bend the spring in the little hook attachement in order to not let the signal fluctuate..

I was told 5 and I got 8, what a treat

Did you connect the wrist ground on below your desk to actual ground?

Superstar Dave thanks

It's not like I'd want to stick a probe into a 300 MHz 5 KV signal source, even if the probe was able to measure it.

"Come a gutser"!

Ähhh, RG174 at 1GHz should have an impedance of 50 Ohm. You just considered the C part only, but there is always a L part as well. So a little bit more than 1,59 Ohms.

19:35 Maybe I misunderstand something, but doesn't directly connected cable behave like 50 Ohm resistor since cable length is quite significant compared to wavelength at least if we ignore losses? (and that's also probably a necessity for that resistor divider to have constant attenuation over different frequencies)

Is there a website that has project circuit boards? I have been building kits up to now and am looking to take it to the next level. I want to peruse circuit boards and I can source the parts.

My Tektronix has the spot for the nice probes. I have just stuck with the ones that came with it.

Passive oscilloscope probe ASMR

5 Types of Oscilloscope Passive Probes I don't own

My Tektronix P6011 1X probes are good to a bit over 25 Meg Hz.

Is the next video going to be active probes? I'd like to be able to measure current and I think I need an active differential probe (and a shunt) but I'm not sure!

Someday I'll have a proper scope.

When driving a car with manual transmission, and one shifts into a lower numerical gear, 5->2 instead of 5->4, it's called a "money shift." What's the equivalent phrase for when one blows up their scope because of error with probe?

"Came with your low end scope" has it plugged into a keysight. lol

I wish I knew more about probes before I bought an antique 10m scope. Dumont 2100g. No wonder I get nothing.

how about putting a potentiometer in series like that 19:00

And then there's also system bandwidth to consider. Example, If you have a 200Mhz scope with 200Mhz probes, don't expect to measure 200Mhz signals. The bandwidth may only be 141Mhz.

With the DIY probe of 21 attenuation you could perhaps make a calculation using a reference value on another channel...

I have to show support simply because I am ☆Australian☆ too... I run a DSO and a CRO on a budget. 2K would buy my lab and 20K would pay for my parts on hand.

Basically, the only new principle involved is that instead of the power being generated by the relaxive motion of conductors and fluxes, it is produced by the modial interactions of magneto-reluctance and capacitive directance.

1 GHz? Say hello to the R&S RT-ZZ80 8 GHz passive 10:1 Probe.

Can those probes be used with AC?

Of all the tools used in a repair set-up Oscilloscopes are the least used, they are really only expensive ornaments

woooow quality content, why you do this to me !

The algorithm wants me to see your probe.

The big difference between the active probe and the coax probe is because the signal goes high z for a period right? The coax has 1050ohm impedance down to DC so it pulls the net down while the fet probe has a much higher DC impedance?

Looks like the maker of DaveCad has expanded to mathematics with DaveCalc.

How about Video about Rogowski probes?

Please turn on subtitles :)

impedance in DC? (did I miss a memo here?) ;)

Aliens love probes! 4 out of 5 toothless abductees agree.

20:03 I guess it incorrect to handle long transmission line like simply capacitor. It also have distributive inductanse. So we have 50 or 75 ohms in stadard cables. It mean on 1 GHz you dont need tec probe with 40 ohm load you can just use 50 ohm cable with 50 ohm terminator on scope side. All you need just check datasheet for cable to know how much dB per meter it eats.

Just watched this video without understanding a thing, guess I'd have to rewatch again. Sad I don't know crap about scopes

"You gonna wire it for 220?" "220 221, Whatever it takes." Mr. Mom. The movie.

Let us know if the Algorithm (TM) will reward you!

....I sometimes accidentally use the word puffs at work or in my master level classes and everyone just goes quiet trying to figure out what I meant. Then I'm like oh ...sorry I meant pico

I don't even have a scope. I really should buy one. Scope first or a beach psu? 🤔

Genuine comment here

RG174 probe will not work on ordinary oscilloscope

I can only afford the cheap Chineseum probs. LOL.

REFLRCTIONS??? oh boy do I KNOW REFLECTIONS!!🤣🤣🤣🤣

WHY CAPS

So I know absolutely nothing about oscilloscopes, but I picked up a cheap kkmoon DS0120M for setting car amplifier gains. I'm posting a link to a short video, I was hoping maybe you had a little insight or advice you could share. I'm assuming the capacitor or resistor or whatever is in the line just isn't functioning properly, which seems like something a little bit higher quality probe should fix. I'd rather not spend money if it's not going to help. Also, I'm only measuring 40hz and 100hz audio tones, which it seems to do well with (haven't fried an amplifier yet), is this an issue that even needs dealing with in my particular case? Thanks in advance for any help, and thanks for the informative videos! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-n_-V9Nm6jqQ.html

I'm a boneheaded. Wear deux the boneheaded go to understand just what uh oscilloscope is 4?

I love my cat! I hate new metal! Thrash for life!

💷💶💴💸💰🆓Where's the AD?

Damn and i've always used x1 just because i didn't like the idea of x10 hahahah. No idea there was any big difference other than looking at weak signals. Why am I even going to college? Don't even teach me simple things like that. Is there any reason to really use x1?

First!?