@acceler9 Yes, I edited down to under 5 mins for the contest! This is the directors cut version!
@DarkEnginseer
13 жыл бұрын
Althoug not beeing an electronic engineer (I'm in mechanical engineering.) I watch your blog with interest (~ for a year), to extend my basic knowledge about electrics/electronics. Also your industry stories and tips, especially "job interviews" helped me a lot. Have you ever thought of teaching students at university? We had at least one Professor who has worked several years in the industry and his very interesting lectures were by far the most important ones, speaking from todays perspective.
@gordonlawrence3537
9 жыл бұрын
The variable cap will always make a difference and it's a transmission line issue not always a piezo effect. Piezo effect generates a voltage from a force. A capacitor needs some charge differential on it for this to have any effect.
@dave-d
9 жыл бұрын
Thanks Dave. Interesting phenomenon. Quite surprised to see an electronics engineer wearing a metal strapped wrist watch though! Nice and conductive! Got rid of all my blings years ago. Keep up the good work mate. Great channel.
@TeraVoltLabs
13 жыл бұрын
I tried this with my scope, and got the same exact waveform and result. Very good eye to catch that dave!
@EEVblog
13 жыл бұрын
@HamRadio2008 Thanks. Nice work on the iPad!
@EEVblog
13 жыл бұрын
@yanava Yes, it sure does happen to boards too. It's a real problem in many industries.
@EEVblog
13 жыл бұрын
@maxsnts No, try it with a fixed x10 probe with no switch.
@yanava
13 жыл бұрын
This could be happening to boards too. That's the reason because most audio boards still use electrolytic capacitors. There are several ways to avoid that with ceramic capacitors. One is to properly lay out the capacitors along regions that won't bend or vibrate under use. Another way is using dampening materials on mounting points. Microphony can also be a problem.
@nodariel
13 жыл бұрын
@EEVblog I didnt mean to critcise, it was just an observation. It's a very interesting concept that ceramic capacitors are prone to the piezo-electric effect and has definitely inspired me and I think many others to investigate this further.
@leopeters1021
9 жыл бұрын
8:18 is a bit 50 shades of grey-like - i mean: what did the probe or the table do to you? ;)
@EEVblog
13 жыл бұрын
@nodariel I played drum sticks with the probe, that's kinda a dead giveaway.
@EEVblog
13 жыл бұрын
@WhatsABoyToDo I've said it many times, the Element 14 sites sucks on so many levels. They have been actively trying to be all the bloggers to contribute material to it, without much success. Talked about this a lot on TheAmpHour radio show.
@mouseminer2978
5 жыл бұрын
It is the EMF generated into the probe and wire by moving into surrounding magnetic field.
@EEVblog
13 жыл бұрын
@Steaphany I've already done two blogs on job interview tips for EE's
@superdau
13 жыл бұрын
Ahh, one has to love ceramic capacitors. I had some larger (over 2cm diameter) disc capacitors, that could almost be used as speakers!
@martinda7446
9 жыл бұрын
Sharpen the tip and play a record.
@DMStern
13 жыл бұрын
You missed the opportunity to include a sponsored link for replacement probes for people who'll bang their ones a bit too hard against the desk.
@jennyminskey4086
Жыл бұрын
Hello, I have a high frequency noise in my home. What instrument can I use to locate where it is coming from?
@chaosopher23
8 жыл бұрын
Time to beat up on a 4.7pf NP0, as I have only one scope probe :D
@EEVblog
13 жыл бұрын
@anthonyj777 Wrong again. I would do a review and teardown of it benefiting thousands of people who would watch it. I don't need to keep the keep the scope, so yeah would likely sell it to someone who can use it more, and to keep me afloat for a few more months.
@ciprianwinerElectronicManiac
13 жыл бұрын
please do a blog about LED's that produce voltage when a bright light it's facing the led
@hdmalpas
10 жыл бұрын
Yep it does the same on my Siglent SDS 1052 DL. I wonder if the 50 to 100Mz hack is possible on the Siglent like that on the Rigol?
@acceler9
13 жыл бұрын
Hello, mate (weird, I've never said 'mate' before; USA-Georgia). I'm a long time fan, never commented before. I think you may be in trouble. The contest website says "Videos must be a minimum of 45 seconds long and must not exceed 5 minutes" and you are way over 5 mins. I hope you submitted the short version! Cheers, hope you win none-the-less!
@EEVblog
13 жыл бұрын
@anthonyj777 Show us YOUR entry then. And of course you are wrong, I've been meaning to do a little thing on probes being piezoelectric for quite some time, thanks.
@nodariel
13 жыл бұрын
Could it perhaps be the oscilloscope? Have you tried acoustically isolating the oscilloscope from the bench?
@HamRadio2008
13 жыл бұрын
Congrats on winning the scope, I won the IPAD !!!!!!!!!!!! Hurray Tek !
@CampKohler
13 жыл бұрын
Piezoelectric probes. Cool!
@maxsnts
13 жыл бұрын
isn't the switch it self?
@leeYT321987
13 жыл бұрын
SOMEONE GIVE DAVE A JOB!!!
@EEVblog
13 жыл бұрын
@tuberlook1 that's heavy editing for you.
@thefatmoop
11 жыл бұрын
could there be any bouncing of the 1x 10x selection switch going on? I wouldn't think so, but throwing that out
@EEVblog
13 жыл бұрын
@eurokid83 That's the plan!
@PelDaddy
8 жыл бұрын
Thanks to this video: 273 broken probes and counting...
@HonestAuntyElle
13 жыл бұрын
I'm getting worried while watching this, i think i can still see the 555 timer fakeout in shot.
@EEVblog
13 жыл бұрын
@heroineworshipper It would generate enough energy to destroy the scope. Bloody caps! :->
@elgus
13 жыл бұрын
full time video blogger!! nice =D
@RandyLott
13 жыл бұрын
Microphonics are intense.
@EEVblog
13 жыл бұрын
@DMStern LOL! *insert legal disclaimer here*
@anthonyj777
13 жыл бұрын
Also as you said yourself you only want to win in order to sell the scope for money, the are far more deserving entries out there.
@truhlikfredy
13 жыл бұрын
Unemployed? Perhaps you should start selling the DaveCAD. I always liked it and with good management you can sell sand in desert so why not a pretty versatile CAD. :D
@Satchmoeddie
12 жыл бұрын
Uh what exactly is a condenser mic? I have had caps in guitar combo amps that were microphonic enough to start a feedback oscillation. When they start singing I just swap them out. Stay away from my probes please!
@alistairmackintosh9412
Жыл бұрын
A condenser microphone is a type of microphone where the transducer is a capacitor, where a condenser is an old term for a capacitor. Given that Q=CV, then dQ/dt=( C×dV/dt)+(dC/dt×V). The output current, dQ/dt, is created by the dC/dt of the capacitor, since the voltage across it is held constant.
@baroque_engineer
10 жыл бұрын
Tried this on my UNI-T UTD2052CL scope with default probes and... Nothing. :)
@gordonlawrence3537
9 жыл бұрын
YS akaYSembed the probes need to be they type where the transmission line adjustment cap is in the probe. It's that cap that is causing the effect. Some probes have the cap adjuster at the socket end by the scope.
@baroque_engineer
9 жыл бұрын
Gordon Lawrence Yes, the default probes of this scope have the adjustment cap inside, not at the BNC connector side.
@gordonlawrence3537
9 жыл бұрын
did you try rotating the probe through 90 degrees?
@baroque_engineer
9 жыл бұрын
Gordon Lawrence Yes. Maybe I just hit the probe too gently... Or maybe UNI-T employs some special method to minimize piezoelectric effect.
@gordonlawrence3537
9 жыл бұрын
It's no just piezo effect. In fact a good deal of it is to do with charge in the capacitance of a transmission line. IE if you change the physical geometry of a capacitor with any given charge on it then the voltage will go all over the place. IE way up when the plates close etc. If you have a high enough bandwidth scope Johnson effect will generate a voltage all on its own. UNI-T scope probes are mid-range at best (or the best of the cheap probes) I use genuine Techtronics 15pf high frequency probes (about £300USD each) and they still do this but there is no ceramic capacitor in the probe, just a tiny rotary mylar adjustable which is similar to most (i dont know of any probes that dont use some form of adjustable cap and most are mylar). The mylar variable trimmers are extremely vibration sensitive. Johnson noise en.wikipedia.org/wiki/Johnson%E2%80%93Nyquist_noise
@artifactingreality
13 жыл бұрын
You quit your job?
13 жыл бұрын
You got my votes, but unfortunately it's just 9% for now, while temporary leader has 18% that is 1000 votes of difference. Maybe you should advertise this episode somewhere @Internet ?
@anthonyj777
13 жыл бұрын
I can just see Dave sitting there thinking; emm... what can I think up for this competition? ..starts tapping the probe like an uninspired writer might do with a pen... sees a few spikes on the screen and goes with the piezoelectric effect as his entry :) I have to be honest, your entry is by far the most boring , while the effect is mildly interesting could you really imaging it happening in a real test situation, and if it did how stupid would you have to be not to know what it was?
@ubuntututorials
13 жыл бұрын
@artifactingreality Altium laid him off...
@MichaelLehet
13 жыл бұрын
Hey Dave, love your videos...have you seen the new website Element14 for engineers? You should check it out and share your vids with them!
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