#924

Рет қаралды 11,719

2 жыл бұрын

Episode 924
I got this off eBay from Ukraine. Not bad for the price
search eBay for "RF active probe 0.1 - 1500 MHz - 1.5 GHz analyzer oscilloscope"
Be a Patron: / imsaiguy

Пікірлер: 35

@kosmic5695 2 жыл бұрын

The output of the 9$ DIY Probe is 50Ohm. Will probably work a lot better with a 50Ohm terminator in front of your scope. For the ground I use a pogo pin soldered to a piece of single core copper wire. This allow me to move it around.

@raymonddompfrank1789 2 жыл бұрын

That's another nice experiment! It'd be interesting to see what the barebones-probe looks like with shorter signal and gnd connections, like the Tek.

@ptronix 2 жыл бұрын

Keep meaning to build one, have had the circuit on my phone for several years! I've got the dual gate mosfet. I was going to use it on my spectrum analyzer, best wishes nick

@peterayearst23 11 ай бұрын

It would be interesting to see how the 2 probes compare when using a spectrum analyzer.

@MetrologyEngineer Жыл бұрын

I immediately had to subscribe! Thanks tour the great video!!!

@ozkarah 2 жыл бұрын

Great video, thanks. But not sure about the position of the 50 Ohm switch of tek probe. As MSO5000 has no 50 ohms input the switch should be in the "Int" position to terminate the load at 50 Ohms. Ma be you might wanna try it again in that mode to reduce the distortion.

@PapasDino 2 жыл бұрын

I built my Janiel probe into a large diameter Sharpie pen body that makes it much more ergonomic to use.

@IMSAIGuy 2 жыл бұрын

does it still write?

@PapasDino 2 жыл бұрын

@@IMSAIGuy Of course it's like one of those old multi-color pens, push a color down to write with one color...in this case you push the probe clicker down and take your measurement! 😈

@NeverTalkToCops1 2 жыл бұрын

I used a BIC pen, the .19cents one.

@fixthetempo7276 2 жыл бұрын

wow seems to very interesting video. going to make some food to view it))

@Khalidparvez4 2 жыл бұрын

APPRECIATED.

@LiraLab 2 жыл бұрын

Yeah, that was a good comparison, maybe other DIYs or modding this one to a shorter ground could do better. BTW, did u get to hack that Rigol scope to its full bandwidth? I've heard it's possible. Thanks!

@IMSAIGuy 2 жыл бұрын

yes, it is the full 350MHz now

@IMSAIGuy 2 жыл бұрын

kzfaq.info/get/bejne/m8efe7yIvrK2hmQ.html

@LiraLab 2 жыл бұрын

@@IMSAIGuy That's amazing! Thank you!

@BrendaEM 2 жыл бұрын

Perhaps there us a 3d printed case.

@t1d100 Жыл бұрын

Interesting

@stevenbliss989 2 жыл бұрын

...it also LACKS DC coupling!

@M0UAW_IO83 2 жыл бұрын

Looks *very* much like an Elektor circuit

@IMSAIGuy 2 жыл бұрын

probably

@pietpaaltjes7419 Жыл бұрын

It is. You can tell by the way the schematic is drawn :-) and the number in the bottom right corner. According to the Elektro site this one was published in October 2004. The author / designer of the circuit is David Jewsbury. Cheers.

@NotMarkKnopfler 2 жыл бұрын

Pardon my ignorance, but what on earth is a FET probe, and why do I need one?

@IMSAIGuy 2 жыл бұрын

kzfaq.info/get/bejne/nJt3qdp8t9jdd40.html

@miguelmiguel7314 2 жыл бұрын

One is a DC to HF probe, de DIY probe is HF only, you don´t need a GND, or at least is what I have seen in my measurements. I have two fet probes too, one DIY and the other tektronics. You have to put the scopes in 50 ohms mode!!! Please test theses probes with the VNA, thanks!

@kosmic5695 2 жыл бұрын

The DIY one is AC couple (cap in series with the input) but nevertheless you always need a ground.

@miguelmiguel7314 2 жыл бұрын

@@kosmic5695 I will try to make a test with the two probes and a fast puser. I don´t understand yet why the DIY AC probe giveme the same results with and without GND, (at VHF UHF frequencies)

@miguelmiguel7314 2 жыл бұрын

:) I found you in eevblog, I´m harriman sat.

@kosmic5695 2 жыл бұрын

@@miguelmiguel7314 I did the test you wanted. No ground is not working really well since it endup using a super long one (In my case via the sma connector of the probe to the VNA).

@mavamQ 2 жыл бұрын

Put that long ground wire on your Tek probe and then do the comparison. You didn't give the DIY a fair test. Put a little effort into making a good tip for the DIY probe, similar to the Tek probe and redo the test. Otherwise, love your content.

@galileo_rs 2 жыл бұрын

What's up with deleted comments? Is this some funny business with KZfaq, the comment by @w2aew is gone and so is mine.

@IMSAIGuy 2 жыл бұрын

KZfaq seems to be deleting any comments that include a link. I don't know why. I have the settings on my end to allow that

@galileo_rs 2 жыл бұрын

@@IMSAIGuy I thought that too and I see that many other youtubers have noticed, creators are complaining about it but the whole thread is gone, their algorithm can't be that dumb?

@IMSAIGuy 2 жыл бұрын

i tried complaining to youtube but they are useless

@galileo_rs 2 жыл бұрын

@@IMSAIGuy Yep. Did a bit of searching, it seems that it is a much bigger problem, comments also get deleted for banned words, like "pri mitive".