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EEVblog #85 – High Voltage Oscilloscope Probe Design

admin by admin
January 30, 2020
in Công Nghệ
40
EEVblog #85 – High Voltage Oscilloscope Probe Design



Doug Ford shows us how he designed his own 1000:1 high voltage oscilloscope probe.

and the Oscilloscope probe tutorial:

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Comments 40

  1. april segura says:
    2 years ago

    Dear sir
    I have a Philips pm 3200 0 – 10 MHz osiloscoop but i dont have the PROBES can you pls help me out with the chematic of the probes . Kinds regards

    Reply
  2. Mohammed Jawad For Electronics and Physics says:
    2 years ago

    that sparrow make me mad 😒

    Reply
  3. James skippinhopper says:
    2 years ago

    YEP!!!

    Reply
  4. captain skeptical says:
    2 years ago

    eat your heart out tektronix :)))

    Reply
  5. Thiago Lucas says:
    2 years ago

    How do ensure the protection of this probe? Is it electrically isolated from the high voltage side? Or your oscilloscope takes care of it with possible internal optocoupler? Is it possible to use this voltage probe with arduino? If yes, do I have to use an isolated component to separate the high voltage side from the low voltage side?

    Reply
  6. Matthias H. says:
    2 years ago

    Thank you very much for this video

    Reply
  7. c muller says:
    2 years ago

    I just found that old video and immediately recognized the voice. Hey it's the microphone guy!

    Reply
  8. Laharl Krichevskoy says:
    2 years ago

    Just checking my Favorites list, saw this one down the bottom of the list. Salutations from the year 2018.

    Reply
  9. Greg Feneis says:
    2 years ago

    Whoa, Dave. This one's pretty old.

    Reply
  10. Jean Pierre Daviau says:
    2 years ago

    1 Meg resistor in parallel with à 56k in parallel. For a 1:1000 reading

    Reply
  11. Jean Pierre Daviau says:
    2 years ago

    We would have liked seeing it tested.

    Reply
  12. Jean Pierre Daviau says:
    2 years ago

    The red cable is a high voltage cable? Does it have a ground wire?

    Reply
  13. Gear Wrench87 says:
    2 years ago

    what happens if you put two 10:1 attenuators in series? does it make it 20:1?

    Reply
  14. RepairAllTV says:
    2 years ago

    ????

    Reply
  15. Alperen Akküncü says:
    2 years ago

    10 puff?

    Reply
  16. Michael Nobibux says:
    2 years ago

    Cool,but good probes use coax with a resistive center conductor to reduce ringing when used with a high impedance scope input.A resistive conductor distributes the total resistance (usually around 100-200 ohms) over its length.A lumped (discrete) resistor on the end of a piece of regular coax will not noticeably reduce ringing.Also a hi-Z probe should be well shielded and then there is the 'high voltage' issue….

    Reply
  17. LM says:
    2 years ago

    Great idea and all but, with all the respect, half of the speech I did not understand, could you tell me please what is that "tail wire" for? and how this unit is attached to the oscilloscope and the probe? I just got part of the description… Thanks in advance.

    Reply
  18. 08Ultrasonic says:
    2 years ago

    I'm interested by the cal factor. What does this represent exactly? Is it the ratio of input to output voltage?
    I assume that you'll be attaching your probe to an oscilloscope, which will have 10-15pF capacitor and a 1M ohm resistor within that scope. It looks like you've omitted that out of your design, which also might be a reason why the cal factor alters at 200Hz.

    Reply
  19. James skippinhopper says:
    2 years ago

    Yep

    Reply
  20. WALLDORF ELECTRON_CO says:
    2 years ago

    My oscilloscope is a PC type that connects via USB. For testing your average low voltage signals and frequencies it works well and responds fast! However, I've built some "high" voltage DC power circuits and voltage doublers varying from 100VDC to 350VDC. I have a two-channel OWON VDS-1022 which says the maximum input voltage is 40Volts from what I can see.

    So how could I test that? Could I modify the probe or use a resistor or two? I'm not talking KiloVolts here!

    Reply
  21. IngenieroCristian says:
    2 years ago

    It's an excelente design, but I think the construción is not safe.

    Reply
  22. TheCrazyStudent says:
    2 years ago

    Nice video. I guess it must be very important to properly clean away every little particle of grease, dirt and flux residues from the whole RC network before potting it in order to minimize the risk of arcing?

    Reply
  23. jeanious2009 says:
    2 years ago

    that looks freaking dangerous. I think I'll pay the quadzillion dollar probe and be safe. lol.

    Reply
  24. DiyMech says:
    2 years ago

    So, with a known calibrated HV source and calibrated meter/scope, what's the accuracy ?

    Reply
  25. Johan Sagaert says:
    2 years ago

    Hmmm, did you try it at 20KV ? I would prefer a long one without copper shield, and add an extra grounding crocko clip.

    Reply
  26. Xiomara Cruz Rodríguez says:
    2 years ago

    Hi, what type of BNC connector you used?

    Reply
  27. Kaledius says:
    2 years ago

    Hi, How do you measure a higher voltage, like 50kv that is very low frequency so we cant use the propes as antenna pickups..?

    Reply
  28. Turncoat says:
    2 years ago

    flippin bird!!!!

    Reply
  29. José Federico Ramos Ortega says:
    2 years ago

    Do you think it is safe to use these probes to check the voltage of windings of one SMPS?

    Reply
  30. DarkLevis says:
    2 years ago

    I learn electric power engineering, which has a lot to do with high voltage and I really liked this!!

    Wish they showed similar stuff in university too =/

    Reply
  31. YummyMercury says:
    2 years ago

    "Half a quadzillion dollars"
    I laughed at that!

    Reply
  32. Drmanbearpig says:
    2 years ago

    I have a question about digital oscilloscopes. Do you know what bandwidth would be needed to measure the peak resonance of a coil rated around 3000kHz? I'm not sure if the bandwidth is actually the specifications of the frequency range it can detect, or if it is something else. If you have any direction I could go in trying to find the right oscilloscope, I would greatly appreciate it. Thanks

    Reply
  33. Manuel Sanchez says:
    2 years ago

    How about a DIY 4-channel digital oscilloscope tutorial? 😛

    Reply
  34. EEVblog says:
    2 years ago

    @henryjarias Thanks to Doug Ford of course!

    Reply
  35. henryjarias says:
    2 years ago

    Hi, Dave. I'm a professor (eng.) in Venezuela. I've learned a lot of things from your EEVBlog. I got surprised to see this video about HV. Not every electronics engineer is an enthusiast of HV stuff…so, thanks for this rather informative video.

    Henry

    Reply
  36. gmcjetpilot says:
    2 years ago

    Dave how about a DIY Active Oscilloscope probe or a RF Probe? Please!

    Reply
  37. doodoodood says:
    2 years ago

    This was an EXCELLENT video. More like this one pleaase!!!

    Reply
  38. Ja Ro says:
    2 years ago

    @Vlakpage check digikey part: 445-2363-1-ND

    Reply
  39. Jan Tichavský says:
    2 years ago

    Those small caps are 3kV rated? It doesn't look like that.

    Recently I needed to get rid of the scope ground connection for measuring HVDC up to 1000V and current on the positive side. So I designed (a bit amateurish) universal analog isolator with current input, it should isolate 1500V minimum. It can measure from mV to kV with great linearity depending on the input resistors. But I didn't include those caps accross resistors, I should read more about them.

    Reply
  40. Phil B says:
    2 years ago

    Nice video indeed Dave & Doug. Thanks for sharing & much appreciated.

    Reply

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