Multimeters

Dave tests the AD8436 True RMS converter chips inside the 121GW multimeter to see if it works well below it’s voltage rail specification. Bonus thermal testing in the chamber. Forum HERE Podcast: Download

Dave takes a look at how to optimise the low burden voltage multimeter design from PART 2 to eliminate some parts. And explains the µCurrent shunt circuit design and how that applies to this new optimised design. It’s basically a practical tutorial in circuit design optimisation. Then another design variation …

Dave looks at the current measurement front end of a typical multimeter and figures out how to redesign it for lower burden voltage. It’s not quite as easy as you might think, there are comprimises and traps for your players. And something you probably didn’t know about HRC fuses. µCurrent …

What is the main chipset used in the EEVblog BM235 Multimeter? Dave finds out. Fortune Semiconductor Cyrustek Hycontek HY12P65 Forum HERE Podcast: Download

What is the difference between LCD viewing angle and bias angle? How does adjusting the LCD bias voltage effect the display? What is LCD Ghosting? Also a demonstration of Photoelastic Birefringence in polycarbonate plastic display covers. Dave investigates the Liquid Crystal Display viewing angle problem in the EEVblog BM235 Multimeter. …