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In Reply to: RE: multimeter is reading very high plate current posted by 91derlust on February 20, 2017 at 21:48:43
Dave's method is what I am using going forward. It gives the appropriate current reading.
I think there is something wrong with my multimeter. After reviewing all of the plug-ins on the multimeter, there are actually 2 spots where "current" can be measured. 1) 10A and 2) 200mA. I was using the 200mA plug-in and was getting the bad readings. I think its time to get a fluke.
Pat
Follow Ups:
Just when you say "appropriate current reading", do you 1) the current expected form the circuit (per Dave's post) or 2) the very high mA you were initially reading? I assumed the former, but some might be assuming the latter...
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
By "appropriate", I am expecting around 9 mA just like dave and others have stated which is supported by the math.
At 100ma,that would mean one triode section dissipates 10 watts and we know it can't do that. If you have any stability issues,I would can the LEDs and go to a high quality cathode resistor.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
I would test the meter with an external 9V battery and a 1K resistor to confirm its function.
dave
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