The Keithley Situation: New Electrometer, Nixie Tube Multimeter, SMU Update

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Hand crank isolation tester:
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No worries, if it doesn't work out, everything will at least stay the same. But if I get a few extra dollars, everything will get a lot better!
In this video we are checking out the current state of my Keithley Meters. I have sold my 610c because it was very eager to overload the analog meter at every opportunity. I have also sold the dual channel 619 because of its acoustics, size and accuracy. To replace 'em I got a 617 programmable electrometer which I consider one of the best devices from the 'brown-enclosure-era'. These are very accurate and sensitive, get no 'sticky switches' and develop problems rarely.
To demonstrate the capabilities of this new old meter I test the isolation resistance of cables and measure leakage currents of ceramic, polystyrene, hermetic / military and silver mica capacitors.
Next I briefly show a Keithley 164 Digital Multimeter with a nixie tube display, hoping that mentioning NIXIE TUBES will flood this video with new viewers, who like to watch videos with N-I-X-I-E T-U-B-E-S in them.
Finally I try to bring the 236 to 237 upgrade to an end by replacing a couple of parts in the power transistor assembly and by calibrating the newly unlocked high voltage ranges with an Arduino based USB-GPIB adapter.
Smartphone macro lens I am using for the closeup shots in the recent videos:
Sorry, I am always loosing patience at the end of longer videos, so it may feel a bit rushed there ...
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