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. *Plus calibration gear Should also work for converting a Fluke 83V to 87V True RMS measurement vs Average Responding And how to calibrate a Fluke multimeter. Fluke 87V service manual with schematic: https://xdevs.com/doc/Fluke/87V/Fluke_87V_Full_service_manual_with_schematic_and_electrical_parts_list_Service_Manual-87VANFullService.pdf 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 Why are Fluke meters so expensive? https://www.youtube.com/watch?v=ay9wFQAW19Y Forum: https://www.eevblog.com/forum/blog/eevblog-1448-convert-a-fluke-77-iv-to-true-rms-for-10-cents/ Subscribe on Odysee: https://odysee.com/@eevblog:7 EEVblog Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 EEVdiscover: https://www.youtube.com/eevdiscover Support the EEVblog through Patreon! http://www.patreon.com/eevblog AliExpress Affiliate: http://s.click.aliexpress.com/e/c2LRpe8g Buy anything through that link and Dave gets a commission at no cost to you. Donate With Bitcoin & Other Crypto Currencies! https://www.eevblog.com/crypto-currency/ T-Shirts: http://teespring.com/stores/eevblog #ElectronicsCreators #Fluke #Hack