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Does the 10G mode slow the response time?
I want to measure the open voltage on a load detection circuit. This circuit can trip when it sees less than 60M Ohm. Maybe I just need to put a 90M ohm resistor in series with my DMM and multiply the readings by 10.
The Agilent 3458A has >10G in all Ranges.
I'm not aware of any straight DMM's that will have such a high impedance at 100V. You're in electrometer territory. Luckily, the Keithley 616 can be found on eBay for quite cheap.