Understanding Measurement Uncertainty (057)

Рет қаралды 1,025

Electronics for the Inquisitive Experimenter

Күн бұрын

So why do I get a different reading than someone else?
Why is my reading so far off of what I expect?
What does this Ohms-per-volt business all about?
This video is all about understanding how confident we can be in the things we measure and how to get the most out of our test instrument.
Time Markers for Your Convenience
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01:45 Test Instrument Tolerances
01:50 Introductions & Foundations
03:33 In Terms of Reading
06:09 In terms of Full-Scale Reading
11:29 Calibration
14:52 Circuit Loading
14:53 What is Input Impedance?
18:16 Why do I care?
22:20 Final comments and toodle-oots
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Пікірлер: 14

@tedivester4947 10 ай бұрын

I was in the Air Force from 1966 to 1970. My specialty was Automatic Flight Control Systems and Navigation, (Autopilot). I worked primarily in the shop and had an abundance of test equipment and equipment to verify calibration of our test equipment. Of course, we needed to take that equipment next door to the Cal Lab. It was kind of scary because it was seen as a sacred place and it wasn't wise to have direct eye contact of the Cal Lab folks. They were kind of the high priests of the test equipment. You brought back memories!

@eie_for_you 10 ай бұрын

Made me laugh ... "high priests of the test equipment."😅Yup, those were the days, my friend. I was 1973 through 1977. That experience and training as served me very, very well through the years. Never regretted serving.

@dennisqwertyuiop Жыл бұрын

great video,thankyou Ralph and Ralph and Ralph

@eie_for_you Жыл бұрын

Thanks Dennis! I had a LOT of fun creating that introduction.

@paulb4985 Жыл бұрын

I learned this lesson early in my engineering career. My design was creating more energy out than what I was putting in! Found out why, learned my lesson, and had a good chuckle. 🙂

@eie_for_you Жыл бұрын

I know that feeling! If we learn to laugh at ourselves then we will never lack for laughter in our lives. Many lessons learned the hard way, but lessons never forgot, either.

@thed8229 Жыл бұрын

I've had so many "discussions" about this with peers over the years. 😂 Another awesome video!

@eie_for_you Жыл бұрын

Thanks man!

@w2aew Жыл бұрын

One the VOM, a 3rd effect on accuracy is the meter's position. If the meter movement isn't "balanced", then it can respond slightly differently if it is vertical or horizontal (even if properly zero'd to start). Good video.

@eie_for_you Жыл бұрын

True, that! I had forgotten that one. I believe that most respectable meters have a balanced meter movement. On the other hand ... the super el cheapo, hardware store meters ... the bets are off on those. The trouble is, ya gotta know what position the movement was designed to be used in to know what position to use it in and they don't tip their hand on that one.

@WECB640 Жыл бұрын

Ralph, this lesson is so important today because the "basics" are not being taught. I would like to see several questions from this video added to the FCC exam for our amateur radio license. THANK YOU for sharing and being a mentor. PS. I was "stationed" at 97.5, the 50Kw FM in Dover just a few years after you left Pease. 🎙 73 OM

@eie_for_you Жыл бұрын

I cannot agree with you more! It is sad that folks do not have an appreciation for these things. I used to make many trips to Dover. I used to swim at the public pool there regularly and I had friends that lived there, too.

@1shARyn3 Жыл бұрын

😀 I STILL call multimeters "VOM"s {and still use my Simpson 260}

@eie_for_you Жыл бұрын

Simpson 260, still being sold brand new! I used to calibrate the old AN-PSM6 VOM ... you could literally run over them with a truck and they would survive (sort of LOL). I wonder if the military still uses them? Probably not.