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Measuring 20 mA dc via Voltage with Current Shunt

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Marbom
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Joined: May 3rd, 2017, 6:18 am
Country: Germany

Measuring 20 mA dc via Voltage with Current Shunt

Post by Marbom » May 3rd, 2017, 6:34 am

Hello,

i want to measure 4..20 mA (dc) with a current shunt of 100 ohm. There are a lot of expensive precision shunts with less than 5 ppm accuracy, but i only need 50 ppm for my application. A 50 ppm Resistance is comparatively cheap. For example:

http://www.mouser.de/ProductDetail/Vish ... WOUB8YC20=

Would such a resistance be suitable or is the selfheating too high? (Power Rating = 0,6 W; P = RI² = 100 ohm * 0,02² A² = 0,04 W)

Thanks!

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