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ms660 · 19th Mar 2019, 12:39 pm

Ohms per volt is range related, eg: if the meter is 20k per volt on DC and it's switched to the 250 volt range the resistance across the meter probes will be 5 meg ohms (20,000*250) on the 100 voltage range it would be 2 meg ohms (20,000*100) and so on etc. The loading effect on the voltage to be measured will vary according to the voltages source impedance, think potential divider.

Lawrence.

19th Mar 2019, 12:39 pm	#60
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Ferrograph 4A: Restoration advice needed Ohms per volt is range related, eg: if the meter is 20k per volt on DC and it's switched to the 250 volt range the resistance across the meter probes will be 5 meg ohms (20,000250) on the 100 voltage range it would be 2 meg ohms (20,000100) and so on etc. The loading effect on the voltage to be measured will vary according to the voltages source impedance, think potential divider. Lawrence.