Excellent question. There is an entire industry devoted to calibration and maintaining standards of all kinds. It's called metrology. Let's hear from some folks here who work in the field.
On Jul 26, 2025, at 9:09 AM, Mike N2MS via groups.io <mstangelo=comcast.net@groups.io> wrote:
For frequency I use two GPS disciplined oscillators.
I bought have some HP Tek and Fluke equipment when our work lab closed down. It was calibrated in 1990 by NIST traceable labs. I also have modern test equipment.
If a measurement is questionable I compare readings on various pieces of equipment.
Mike N2MS
On 07/26/2025 10:14 AM EDT 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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