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Kevin:
I do not imply that there is a constant ratio of the probe resistor and the divider. Since the divider must also work on AC, that must be considered. The probe resistor both isolates the rest of the probe assembly and completes the divider for DC.
Actually 15 meg dividers use 7 meg probe resistors for a 22 meg input resistance. That doubles the DC input resistance of 11 meg meters.
For a start, either measure the input resistance or add up all the values in the divider network.
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