Very cool video. It would be nice to show a schematic diagram of your test set-up for people new to electronics so they could see how your circuit works. Regards, David
This channel isn't really geared toward newbies. I don't have enough elevator music to give complete background info - there are just some things the viewer is expected to know or investigate on his own. And I will also gloss over (or even ignore) things that can get complicated, are secondary effects or issues more in theory than in practice at the hobbyist level, and would absolutely kill the pace of the video if included. I did give a description at around 5:25-5:58 which should be sufficient for the curious to derive the schematic on their own.
For schematics and a lot of detail about the nuances of this technique, look up the Fluke 720A manual, which is a fairly similar unit, and go to section 2-39: Measuring Unknown Resistance. It goes into quite a bit more detail, also correcting for the resistance of the leads between the power supply and resistors, and between the resistors. But it uses the same principle that two resistors in series form a voltage divider, and that a Kelvin-Varley Divider can measure voltage ratios very accurately.
@@alm3.1416: Nice demonstration. Of course, at the resistances in his test, LEAD resistance is inconsequential. When we begin factoring in lead resistance, we will be entering the rabbit hole where temperatures of EVERYTHING, and thermal EMF at junctions come into play. He certainly wouldn't be holding the resistors with his fingers 😂.
Ah ha! Since I just happen to have a 6 digit Kelvin Varley divider, I can get a new resistor by matching for my Tektronix dmm, which, somehow, I managed to Woof! the 10 M Input resistor... I do have a 6-1/2 digit HP multimeter, and picked a 10 M from a batch of 1%, that's reading 10.001 M, but now, maybe, I'll try matching a 10 M to the divider chain..
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Very cool video. It would be nice to show a schematic diagram of your test set-up for people new to electronics so they could see how your circuit works. Regards, David
This channel isn't really geared toward newbies. I don't have enough elevator music to give complete background info - there are just some things the viewer is expected to know or investigate on his own. And I will also gloss over (or even ignore) things that can get complicated, are secondary effects or issues more in theory than in practice at the hobbyist level, and would absolutely kill the pace of the video if included.
I did give a description at around 5:25-5:58 which should be sufficient for the curious to derive the schematic on their own.
For schematics and a lot of detail about the nuances of this technique, look up the Fluke 720A manual, which is a fairly similar unit, and go to section 2-39: Measuring Unknown Resistance. It goes into quite a bit more detail, also correcting for the resistance of the leads between the power supply and resistors, and between the resistors. But it uses the same principle that two resistors in series form a voltage divider, and that a Kelvin-Varley Divider can measure voltage ratios very accurately.
@@alm3.1416: Nice demonstration. Of course, at the resistances in his test, LEAD resistance is inconsequential. When we begin factoring in lead resistance, we will be entering the rabbit hole where temperatures of EVERYTHING, and thermal EMF at junctions come into play. He certainly wouldn't be holding the resistors with his fingers 😂.
Ah ha!
Since I just happen to have a 6 digit Kelvin Varley divider, I can get a new resistor by matching for my Tektronix dmm, which, somehow, I managed to Woof! the 10 M Input resistor... I do have a 6-1/2 digit HP multimeter, and picked a 10 M from a batch of 1%, that's reading 10.001 M, but now, maybe, I'll try matching a 10 M to the divider chain..