How to estimate the battery life of a product. In this example, the BM786 multimeter.
How to measure battery current accurately, avoiding Burden voltage, and looking at battery datasheets characteristic curves. The difference between alkaline and lithium primary batteries.
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Why use AA's instead fo 9V batteries in multimeters?
https://www.youtube.com/watch?v=ILIO5b1BliE
Forum: https://www.eevblog.com/forum/blog/eevblog-1533-how-to-estimate-product-battery-life/
00:00 - What is the battery life of the BM786 multimeter?
01:55 - DaveCAD - Linear Regulators are Constant Current loads.
03:49 - The Rohde & Schwarz NGA100 PSU is pretty schmick
05:00 - The Burden Voltage problem
06:34 - Current consumption in AC mode and backlight
07:58 - The battery cutout voltage and hysteresis
08:48 - Why do multimeters waste battery capacity?
09:21 - Alkaline Battery Datasheet time
10:06 - DC-DC Converters are Constant Power loads
12:00 - How good are Energizer Lithium batteries?
14:26 - Temperate effect on lithium batteries
15:30 - Different types of characteristic curves
16:36 - Extraporlating the curve
18:46 - Conclusion
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About EEVblog
NO SCRIPT, NO FEAR, ALL OPINION. An off-the-cuff Video Blog about Electronics Engineering, for engineers, hobbyists, enthusiasts, hackers and Makers. Hosted by Dave Jones from Sydney Australia.
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