The WWV broadcasts are good time and frequency "standards". One can also use GPS as calibration sources. Of course, we are not running a metrology lab, but for our purposes WWV is plenty adequate. GPSDOs are not "that" expensive. Mine offers at times several parts in 10^11. WWV is modulated by the Doppler introduced by the dynamic ionosphere, but plenty good enough. I believe several kit suppliers offer voltage standards at reasonable prices. Just shop around online.
Dave - WØLEV
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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Dave - WØLEV
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