Astro Micro Meter Low Volt Modification
Chuck Haverlah in Thousand Oaks CA figured out how to modify an Astro Micro Meter so it does not consume any power from the source (uses an auxilliary 9v transistor battery) and will operate down to zero volts. Chuck was also kind enough to talk me through the modification.
This modification is very useful for measuring amps, watts, and volts for the battery packs and motors we are often concerned with for our very micro models. For example, a 4-cell NiMH or NiCd pack will drop its voltage below 4 volts pretty quickly undur a load. The Astro Micro Meter officially works at 4 volts and above (in practice it quits at about 3.75v). It also consumes some power from the source. This easy modification solves both those problems.
I've written up the technique with photos and a diagram and put it on my site. Here's the Link.
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