On Fri, 15 Mar 2024 14:57:51 -0700
"Lyndon VE7TFX" <lyndon@...> wrote:
When reading the voltage charts in tube radio manuals, the numbers
you measure with your DMM likely won't line up. That's because the
values in the manual were measured with a VOM having an input
impedance of 20,000 ohms/volt, whereas your DMM has an input impedance
of around 1M ohm. The DMM will show higher voltages because it
doesn't load the circuit as much.
My voltage/resistance checks were mostly for experience and curiosity sake.? I wasn't expecting accuracy for now but want more accuracy in the future as experience, both hands on and guided advice such as this will hopefully build my knowledge and competency levels.
I have a small collection of VTVM's (Stark, Senior Voltohmyst) and have upgraded several of the Heathkit models including an unmolested Heathkit built EUW-24 Malmstadt-Enke lab VTVM design for the Berkeley electronics/physics programs lab.? I love the look of the retro green faceplate that the EUW-24 and the EUW-27 sine square generator have, both sitting proudly on my bench shelf.? Both were bought from University of Miami and had been sitting untouched for years in storage having had little to no use.
No doubt it'll be less accurate than an HP 410B/C mentioned, but I can live with that until I come across an HP.? ?HIHI
Peter
VE9KX
