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Differential Probe

Question asked by marquitos550b on Oct 22, 2013
Latest reply on Nov 11, 2013 by marquitos550b

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Hi all,
I'm working on repairing UPS's and AC motor controllers.
I need a high voltage differential probe and I can only get a Pintek DP-50.(http://www.pintek.com.tw/files/pintek/DP-MANUAL.pdf). My question is whether it will work properly with my DSOX3014A? .

Sorry for my bad English.

Thanks in advance
Best regards from Argentina
Marcos.

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algoss Oct 22, 2013 5:39 AM
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I don't see any reason why not. The probe appears to have a 1MOhm compatible output and the scope has a 1MOhm input.

Your mileage may vary.

Al

Disclaimer: For more reliable response, you should consider calling your local Agilent Technical Call Center. The Agilent Forums are monitored on an "as available" basis, and aren't necessarily the fastest way to get technical questions answered.
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marquitos550b Oct 22, 2013 6:58 AM
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Thanks for responding,
my doubt is about the reliability of the Pintek dp-50. Safety, quality of construction, etc..

Regards
Marcos.
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- algoss @ marquitos550b on Oct 22, 2013 7:09 AM
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  I can't comment on "Safety, quality of construction, etc.."
  
  Agilent has the N2891A 70 MHz, 7 kV high-voltage differential probe, which will have the safety, quality, and reliability you may want.
  
  Al
  
  Disclaimer: For more reliable response, you should consider calling your local Agilent Technical Call Center. The Agilent Forums are monitored on an "as available" basis, and aren't necessarily the fastest way to get technical questions answered.
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marquitos550b Oct 22, 2013 7:53 AM
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Well, then I'll make the attempt.
If anyone has experience with Pintek please comment.

Thanks for everything.

Best regards
Marcos.
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Willco788 Oct 24, 2013 3:44 PM
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I would be careful using aftermarket probes from other vendors. I Used a 100X probe on my DSOX3024 only to find out that when I was measuring AC ripple on 1000 volts DC power supply, the
voltage made it's way to the channel input circuits. The probe was a simple 10 meg Ohm dropping resistor in series with the tip. The Agilent 1000X probe is a true voltage divider. With AC
coupling the scope switches in a cap in series with the input and the 10 meg Ohm probe resistor charged that cap to 1000 volts. Even though I was AC coupled, the trace started to drift
upward. I don't know the specs on the caps that Agilent used in the channel circuits but I'm sure they weren't rated at a 1000 volts.

Jack
Willco Electronics.

Edited by: Willco788 on Oct 24, 2013 4:42 PM

Edited by: Willco788 on Oct 24, 2013 4:43 PM
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Nestor_Groel Oct 24, 2013 7:14 PM
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Marcos:

Escuchalo mejor a Wilco, algunas de esas puntas de alta tensión son un desastre y podés cargarte tu osciloscopio. Fijate si por el mismo valor no conseguís algo usado en ebay pero de mejor marca, yo al menos iría por ese camino.

Saludos también desde el sur!

Sorry Wilco and Algoss, mi answer was in spanish to Marco. In few words, if the budget it´s not enough for a new Agilent probe, I told him that not put on risk their oscilloscope and better search ebay for a used probe instead buy one of unknown quality.

Sorry again
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- algoss @ Nestor_Groel on Oct 25, 2013 4:45 AM
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  As an Agilent employee, I have to agree with Nestor. Find a used probe on EBay, or rent one.
  
  Al
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  - marquitos550b @ algoss on Nov 10, 2013 6:53 PM
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    Sorry for the delay, I've been busy.
    
    I'll take your advice and delay my purchase to get something better (if I can).
    The Pintek dealer says DP-50 has already sold with very good results ...... but you never know .....
    
    Thank you all for reply
    Greetings from Argentina.
    Marcos.
    
    (Hola Nestor, gracias por la hamabilidad de responder en mi idioma. Un abrazo.)
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    - Nestor_Groel @ marquitos550b on Nov 11, 2013 4:43 AM
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      Marcos, soy de Argentina también, por lo tanto es mi idioma también, de hecho mi ingles es malo :-). Un amigo compro en ebay una que tenía una pelotudez por menos de lo que salió una china y es de mucha mejor calidad. Un abrazo.
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      - marquitos550b @ Nestor_Groel on Nov 11, 2013 9:08 AM
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        I understand what Willco says ,
        but knowing that some Agilent probes are manufactured by Sapphire and seeing some teardowns I do not see big differences....
        ..... So I'll take the risk ...!!
        
        Sorry for my ( and google translator) very bad English.
        Regards
        Marcos.
        
        Teardown- "http://www.eevblog.com/forum/testgear/teardown-pintek-dp-25-differentail-probe/"
        "http://www.eevblog.com/forum/testgear/lecroy-25mhz-hv-differential-probe-teardown-repair/"
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        Sapphire.png349.6 KB
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Differential Probe

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