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Modifying A $3 Harbor Tool Multi Meter To Measure High DC Amp Draws
Posted by: Critterhunter
Date: October 28, 2010 09:25AM
The following instructions will show you how to make a great, cheap, and simple home made shunt using the $3 multi meter from Harbor Tool & Freight. In the RC crowd there are several threads along these lines. Some of them are using an external shunt which gets messy with wires, while others lack the finer detail to walk people with zero knowledge about electronics through the modding process using a meter method, which meters can be used, and etc, so I wrote a step by step guide using a cheap meter from Harbor Tool & Freight.

Buying equipment capable of measuring high DC amp draws can be costly, and most meters can only do this on very small scales with out spending a bunch of money on meters capable of reading large current levels, so this easy mod to a cheap Harbor Tool multi meter will save you a bunch of money, not to mention that it has proven more accurate than many commercial units.

A device like this is very useful in RC planes where you can get an accurate measurement of the amp draw of high powered brushless motors to avoid undue battery stress, but why would you want one otherwise? Well, for example, it can be very handy when troubleshooting things like car problems. For instance, not long after I built this my sister



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Re: Modifying A $3 Harbor Tool Multi Meter To Measure High DC Amp Draws
Posted by: Critterhunter
Date: October 28, 2010 09:27AM
More pics that wouldn't fit the first post...



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Re: Modifying A $3 Harbor Tool Multi Meter To Measure High DC Amp Draws
Posted by: Critterhunter
Date: October 28, 2010 09:27AM
Last two...



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Re: Modifying A $3 Harbor Tool Multi Meter To Measure High DC Amp Draws:thumbup:N/T
Posted by: w6pea
Date: October 29, 2010 12:59PM

(This message does not contain any text.)



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Re: Modifying A $3 Harbor Tool Multi Meter To Measure High DC Amp Draws:thumbup:
Posted by: Critterhunter
Date: December 20, 2012 09:43AM
Recently this came up in conversation so I figured I'd bump it up again. :throw:



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