Originally Posted by plodalong
I worked in a calibration centre for a few years calibrating electronic test equipment and aircraft tooling. In those years I can't recall failing a digital muiltimeter on dc ranges, ac calibration is a different story. Although I havn't checked it's calibration recently I doubt my is muiltimeter more than 10mv out.
thanks for dropping in ... accuracy nut here ... really like having NIST-Traceable Calibration standards in my lab. weight set used by State to calibrate scales. Wallace & Tiernan precision dial manometer, Snap-on electronic torque calibrator, pin & block calibration sets, etc, etc.
pretty safe to say most instruments that make into a calibration lab are fairly high grade. cost to calibrate exceeds value of typical $15 meter.
basic calibration checks can be done easily for free .. take a 3v primary lithium cell into any HVAC store that sells Fluke meters. measure 3v cell against new Fluke 87V or what ever store has available. primary lithium cells put out very stable voltage.
here I've set MC1000 muti function calibrator to output 3.258V DC
Fluke 189 measures 3.258v DC, confirming accuracy