Measuring 185 µΩ In Circuit


To measure resistance, you usually have to take the resistor to be tested out of the circuit, and sometimes that’s impossible. If you’re using a multimeter, measuring very small resistances is difficult to say the least. Combine both these problems – measuring microOhms in-circuit – and you have a problem that’s perfectly suited for the Mooshimeter.

Announced just a few weeks ago, the Mooshimeter is a two-channel multimeter that communicates with your cell phone over Bluetooth. It’s perfect for measuring current and voltage simultaneously, all while being tucked away in some place that’s either dangerous, inaccessible, or mobile.

The Mooshimeter team put together a great example of what can be done with their meter by measuring the resistance of a car battery grounding strap while behind the steering wheel. To do this, they put alligator clips across the grounding cable and clamped on a current meter.

Inside the car, they whipped out their cell phone and looked at the Mooshimeter’s output for the voltage and current measurement. The Mooshi app has an IV curve (with linear regression in the works), so simply dividing the current and voltage gives them the resistance of the battery’s grounding cable.

It’s a very cool and extremely simple demonstration of how cool the Mooshimeter actually is. Video of the demo below.

17 thoughts on “Measuring 185 µΩ In Circuit

      1. One can get a 6.5 digit HP 3455A/3456A or a Solartron/Schlumberger for that money very well. And these DVMs have a real reference so all the 21 bits of resolution are usable, not a 24 bit ADC with a zener diode reference joke.

      2. I hope you’re joking, because even a decent multimeter that can even precisely real type-K thermocouples and measure capacitance and inductance of most hobby sized components can be bought for that price.
        Paying out of the ass for Bluetooth 4.0 connectivity, which only recent smartphones sports.

        Over-engineering the wrong part of the design, bang-for-the-buck must be a alien concept to those behind the Mooshimeter

    1. As much as this is bad, flukes are way overpriced and they stoped in time in the 50’s in term of convenience.

      the most you can get even with inifinite funds, is a remote digits display. Or a one axis plot over time for another model.

Leave a Reply

Please be kind and respectful to help make the comments section excellent. (Comment Policy)

This site uses Akismet to reduce spam. Learn how your comment data is processed.