Lab Calibration Results

[RoboTechEd]

Hi All,

In another thread I mentioned getting in a DMMCheck Plus to calibrate all of my test gear (link). I got it in today, and measured all of my test equipment to see what was within spec and what wasn't. I have compiled the data below in a google doc spreadsheet. I figured I'd share it here because everyone loves more data   

Interesting Findings:
-My $10 pocket multimeter is one of my most accurate
-The old Fluke-8012A is still well within spec (incredible considering the age)
-All meters seemed to struggle most with the lowest resistance/AC Voltage/Current

Next step: Calibration!

Feel free to chime in with suggestions/critiques.

https://docs.google.com/spreadsheets/d/1iuMLSG44whJUPThB31mjJ63v_EDOB1AnHA3-22toGvg

[ElectroNub]

pictures or it didn't happen!

[Dave]

Variance and error are two entirely different things.

Measuring a square wave with a non-RMS meter will not yield the correct result. If you want to see the actual measurement error, you need a sine wave.

[RoboTechEd]

Variance and error are two entirely different things.

Measuring a square wave with a non-RMS meter will not yield the correct result. If you want to see the actual measurement error, you need a sine wave.

You are correct. I updated the spreadsheet. oops! Also, All of the meters were RMS meters luckily, besides the Knight DMM. I highlighted those results red to imply to look at the notes. I do think 5.55v is an accurate reading though for a 5vpeak square wave. I just checked on the DMMCheck site, and they confirmed that. Also, it was surprising that so many of my cheap meters were RMS!

pictures or it didn't happen!

Whatya want pics of? The results? I guess I could have made the data up without photographing the equipment's screens....Guess we'll never know