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  1. #1
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    High voltage probe for Oscilloscope 1000X

    I am using a USB Oscilloscope with 5 V input (Max).
    I have a 10X probe
    I wish to make a 100X input divider
    This divider with 10 X probe will make it a 1000X arrangement that will allow me to measure 2 - 3 KV pulses in the range of about 100Ás.
    Any tips or link to appropriate source will help me trying this.

    https://electronics.stackexchange.co...n-oscilloscope

    Here I found this circuit but am worried about the values of capacitors ( what to use).

    Click image for larger version. 

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  2. #2
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    Re: High voltage probe for Oscilloscope 1000X

    I am just guessing but 1pf is approx 1-2cm of dangling wire. 15pf capacitors are rather easy to get and they will have perhaps 100-250v working rating.

    In the circuit you present, the capacitors get the same voltage as the resistors. If each resistor is getting 250v, the total applied voltage is 2.5kv. You will need capacitors with at least 350v rating.

    The layout will be important in this particular case. Also take usual precautions when using high voltages.



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