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High voltage measurement

Hi, I would like to accurately measure voltages on the range of ~200V at frequencies up to 1kHz. I have been trying to use voltage dividers made with resistors but, unfortunately, I haven’t been able to make any which provides reliable phase information at my maximum frequencies. I was wondering if there was any ADC able to read such voltages. Otherwise, can someone point me to a better solution?

Thank you

Regards,         

JMGL

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  • JMGL: Looking at the your description of your application, I think it is important that the resistor divider you use has a high resistance so that it does not consume too much power and cause drift in resistance value.  In the response from Nicola to use the AD7401A, you could use a 1000:1 divider to take your +/-200V and divide down to +/-200mV.  If you use a 10M and a 10K divider you would reduce power consumption to 4mW.  You would need to compensate with capacitive divider too as described by Dirk.  Nicola could provide support on the AD7401A.

    Regards, Brian

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  • JMGL: Looking at the your description of your application, I think it is important that the resistor divider you use has a high resistance so that it does not consume too much power and cause drift in resistance value.  In the response from Nicola to use the AD7401A, you could use a 1000:1 divider to take your +/-200V and divide down to +/-200mV.  If you use a 10M and a 10K divider you would reduce power consumption to 4mW.  You would need to compensate with capacitive divider too as described by Dirk.  Nicola could provide support on the AD7401A.

    Regards, Brian

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