Test Equipment

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 shows you how to setup, measure and generate an Efficiency vs Load Current characteristic curve for a DC-DC converter, just like you see in the datasheets. Several traps for young players are discussed, along with plotting Logarithmic axis charts in a spreadsheet. Electronic Load Kit BM235 Multimeter: http://amzn.to/2hJp78T Rigol ...

How does a high voltage differential probe work? How is it safe? Is it isolated? A teardown and some reverse engineering of the Lecroy AP031 25MHz HV Differential probe. a.k.a Sapphire Instruments SI-9001 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 ...