UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

ms660 · 20th Mar 2019, 12:03 pm

Yes, that's a good training film, there's more like that on Youtube.

Yes, you're on the right track, but be aware that the input resistance of some DMM's can be lower than the input resistance of a 20k per volt meter that has the 100 volt range selected.

You can probably figure out by now why some voltage measurements are different when measured with meters of different specs.

Also be aware that the voltages given in service manuals etc are not set in stone, in the real world they can vary from those given even when the unit is working as it should.

Keep at it.

Lawrence.

20th Mar 2019, 12:03 pm	#64
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Ferrograph 4A: Restoration advice needed Yes, that's a good training film, there's more like that on Youtube. Yes, you're on the right track, but be aware that the input resistance of some DMM's can be lower than the input resistance of a 20k per volt meter that has the 100 volt range selected. You can probably figure out by now why some voltage measurements are different when measured with meters of different specs. Also be aware that the voltages given in service manuals etc are not set in stone, in the real world they can vary from those given even when the unit is working as it should. Keep at it. Lawrence.