High Frequency Active FET Probing DEMONSTRATED

Ғылым және технология

High Frequency Active FET osciloscope probing demonstrated.
Also a comparison with a high frequency DIY resistor probe, and the differences in resistive loading. A tutorial in high frequency probing.
Content extracted from EEVblog 1368
• EEVblog #1368 - Active...
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Пікірлер: 29

  • @jhonbus
    @jhonbus14 күн бұрын

    4:52 "I would not be buying a sold-as-is FET probe off ebay!" Shahriar from the signal path definitely would, and it'd fix itself 2 minutes into the video 😂

  • @JustinAlexanderBell

    @JustinAlexanderBell

    14 күн бұрын

    real

  • @CarlVanWormerAE7GD
    @CarlVanWormerAE7GD13 күн бұрын

    The best "cheap-out" scope probe tricks I use with my standard 200Mhz 10x probes are: 1. Touch the scope ground point with your scope probe to see how much “stray” signal your connection method is producing. This can help avoid wasted time chasing the cause of the “bad” signals that are not really there. 2. To see if your scope probe capacitance is screwing with your probed signal, touch the same point with a second probe to see how much it changes your displayed waveform with the doubled probe loading effect. If the displayed waveform changes “too much” then the scope probe capacitance is the most likely cause. You don’t need to monitor the second channel, but it needs to have the ground lead connected to your circuit and be plugged into another scope input (even the external trigger input). 3. To reduce the loading effect of the scope probe capacitance, grab a 1k-Ohm leaded resistor with the scope probe and probe the circuit with the other end of the resistor. This can show a much better representation of the waveform being probed. 4. To reduce “RF” interference on low-level analog signals you are probing, grab a 10k-Ohm resistor with the scope probe and probe the circuit with the other end of the resistor. This will give you a better “BW Limit” function, lower than the scope button for the 20MHz BW limit with only a small additional DC error. 5. For a better understanding of the probing impedance effects in your circuits, use an impedance nomograph to help you estimate impedance ratios for the circuits you are probing (like the ones at www.testecvw.com/carl/CarlMain.htm ) Later, Carl

  • @myleft9397
    @myleft939714 күн бұрын

    4-5 figures!? It better come in a nice box. Interesting video.

  • @pipatron
    @pipatron13 күн бұрын

    You could mention that there are pretty simple active DIY FET probes which are perfectly capable if you don't need perfect calibration. There are hobbyists selling finished boards in the range of $20. I'm very happy with mine.

  • @KeritechElectronics
    @KeritechElectronics14 күн бұрын

    Gotta love them teeny tiny grabbers! Putting those LEDs on an active probe was a genius move on Agilent's part.

  • @grhinson
    @grhinson14 күн бұрын

    "Beyond the bandwith", sounds like the name of a podcast

  • @EEVblog2

    @EEVblog2

    14 күн бұрын

    Trademark.

  • @LawpickingLocksmith

    @LawpickingLocksmith

    14 күн бұрын

    Beyond Ingham: Chicken dinner?

  • @KeritechElectronics

    @KeritechElectronics

    14 күн бұрын

    @@EEVblog2 "The Amp Hour: Beyond the Bandwidth" :)

  • @sanches2
    @sanches214 күн бұрын

    I loved those fish like probes with led eyes at my previous job :)

  • @borayurt66
    @borayurt6613 күн бұрын

    Nice... For the price of the cheapest one, you can buy 4 of my current bench oscilloscopes. 🤪🤪

  • @sebastian_harnisch
    @sebastian_harnisch14 күн бұрын

    Main channel content

  • @VandalIO

    @VandalIO

    10 күн бұрын

    Yes

  • @markadams2765
    @markadams276514 күн бұрын

    My Rigol Probe not only does it have single, diff ended heads , plus 2 upmarket doggy Dave heads one with a ferrite bead 1 cable. It also contains solder a small ruler and a calibration kit.

  • @MadeInMichigan
    @MadeInMichigan13 күн бұрын

    so why not put a 1m ohm resistor (or 10k or 100k or whatever) in your homemade probe? what happens then?

  • @emmoemminghaus6455
    @emmoemminghaus645513 күн бұрын

    @Dave OK the DIY Probe behaives differently, but which orobe points to what really happens on the bus?

  • @andymouse

    @andymouse

    13 күн бұрын

    Great question :)

  • @hermannschaefer4777
    @hermannschaefer477713 күн бұрын

    It's quite funny if you order 20x N7002A and don't add "mosfet".. purchase department might have some questions.. ^^

  • @tommihommi1
    @tommihommi114 күн бұрын

    for measuring the rise time of a random gpio switching off a cheap microcontroller, 1GHz bandwidth might not be enough

  • @padmanabhaprasannasimha5385
    @padmanabhaprasannasimha538514 күн бұрын

    I see probe, I hit like.

  • @EEVblog2

    @EEVblog2

    14 күн бұрын

    That's what she said.

  • @KeritechElectronics

    @KeritechElectronics

    14 күн бұрын

    Eric Cartman likes that!

  • @padmanabhaprasannasimha5385

    @padmanabhaprasannasimha5385

    14 күн бұрын

    @@EEVblog2 I walked right into that one 🤣

  • @andymouse

    @andymouse

    13 күн бұрын

    @@padmanabhaprasannasimha5385 :)

  • @VandalIO
    @VandalIO10 күн бұрын

    Does this work ?

  • @paulcohen1555
    @paulcohen155514 күн бұрын

    They can throw in a nice case for the PRICE OF THE PROBE.😂

  • @rb8049
    @rb80497 күн бұрын

    1pF is often too much.

  • @leandrolaporta2196
    @leandrolaporta219613 күн бұрын

    4 figures! Are tou kidding me?, That's a ripoff 😮

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