EEVblog 1448 - Convert a Fluke 77 IV to True RMS for 10 CENTS!

How to convert a Fluke 77 IV average responding multimeter into a True RMS model 177 for 10 cents. Should also work for converting a Fluke 83V to 87V True RMS measurement vs Average Responding And calibration of a Fluke meter. 00:00 - Hacking a Fluke 77 IV Multimeter 00:35 - Is the Fluke 70 series discontinued? 01:15 - Fluke History 03:10 - I noticed something... 04:49 - The AD737 True RMS converter chip 06:04 - Theory of Operation 07:21 - What is Crest factor 08:58 - How do they do it? 09:25 - Fluke 87V Schematic and the custom ASIC 10:53 - Let’s modify it! 12:58 - A sine wave is NOT a crest factor of 1 14:01 - Soldering 15:15 - Will it work? 16:46 - Calibration procedure 20:09 - Winner Winner Chicken Dinner Forum: Subscribe on Odysee: @eevblog:7 EEVblog Web Site: The 2nd EEVblog Channel: EEVdiscover: