Other than a check now and then with something as simple as a 1.5V battery to check voltage on a meter, I don't calibrate my test gear. It's as good as it is in my application.
Since I'm not lunching missiles, don't have a government contract, or work for Rob Sherwood, close enough is good 'emuff for me.
And then there is cost!
Between shipping a 50 pound HP counter to a calibration shop, and provided they will even look at this old beast, I simply can't afford a traceable to NTS standards.
I've always wondered how Paul, from Mr Carlson's lab, calibrates or pays for his equipment to be calibrated that lines his service bench.
And that leaves me with this photo. Which one is right? In the overall course of life, both are good 'enuff for fixing a 50 year old Heathkit.
On Jul 26, 2025, at 10:14 AM, Tom ai4th via groups.io <alnath14308=gmail.com@groups.io> wrote:How do folks assure the accuracy of their test equipment? DVM, VTVM, oscilloscope could all use a good voltage standard. Signal generator and oscilloscope need frequency standards. More obscure stuff like IC testers, LC meters, etc also need verification or calibration. In my case I have stuff spanning 50 yrs and manufacturers from around the world. How do you decide what you can trust and what needs repair/replacement?
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