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Re: More final comments on the Heathkit QM-1.

 

On Tue, 15 Nov 2022 at 12:49, Jeff Green <Jeff.L.Green1970@...> wrote:

I bought the QM-1 on a whim. I don¡¯t have any need for a Q-meter at my knowledge level. I was following the threads on Q-meters and when I saw the Heathkit for such a good price, I had to buy it. Worst case I was out a few?

That sounds great.?

I am a bit amazed at the dedication to measuring that last digit displayed herein. And that is not criticism. I appreciate the energy, determination, and, skill sets required.


A lot of people, myself included, enjoy trying to make something better, even if we don't really need it.
?

And here I thought I was doing pretty good when I bought a 4 and half digit DVM for accuracy!


That's good enough for most things. I have 6.5 digits, and that's good enough for everything. But I know a few people with 8.5 digits, but none need it. But if I could afford 8.5 digits, I would have one. Note each extra digit is a 10x increase in resolution, and unless that's accompanied by a 10x decrease in uncertainty, it is usually not that useful.

One suggestion - take a look at the first 5 sections of
to learn the difference between terms like error (which we can never know), uncertainty, accuracy and other related terms.

I would avoid buying semiconductors from places like eBay, because there are a lot of fakes around. It will be frustrating if you build something which does not work because the semiconductor you? are using is fake. A lot of old articles use obsolete devices which have not been made for years. But you will find Chinese sellers on eBay having thousands of them. You can be 95% sure they are fake.

Dave

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