Published:2009/7/17 1:37:00 Author:Jessie | From:SeekIC
The schematic diagram of the probe reveals its simple circuit. It is a standard voltage divider made up of resistors with a 1-percent tolerance. Resistors R1 and R2 are the key elements here. They are rated at 15,000 V and 10,000 V, respectively. The 7500-Vdc peak specification for the assembled probe must not be exceeded under any circumstances! The values for series resistors R3 and R4 are in parallel with the 10-MΩ resistance of the DVM, thus providing a 1000-to-1 voltage divider. Voltage measurements made by the probe should be multiplied by a factor of 1000. If your DVM uses an input impedance different from the standard 10 MΩ, you can adjust the R3/R4 series combination, as needed.
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