Current testing

A project log for Watt-A-Live INA209 Power Monitor Shield Wing

A 6.4A-2uA current/voltage/power monitor based on the TI INA209 with dedicated GND usable as Shield, Wing, Breakout or Breadboard.

magicwolfiMagicWolfi 09/24/2019 at 18:030 Comments

The board survived 4.95 A through the 0.05 Ohm shunt and test jig 0.5 Ohm resistor for > 1 minute. The shunt did not get too hot. My index finger temperature probe stayed rare.

 The 5 W power resistor on the test jig got too warm to touch, so some forced air cooling will be required for longer tests. Or a bigger resistor to handle the 12.5 W. 

Todo: Getting a log of the measured data from the INA209 and more testing to follow.


with 0.05 Ohm Shunt

Multimeter Verification

Fluke 179

0.5 Ohm
4983.4 mA
5.0 A

193.2 mA0.194 A99.6%

5.271 A5.29 A99.6%
2 Ohm220.6 mA222.1 mA99.3%

400.9 mA399.4 mA99.6%
110 Ohm
52.4 mA
50.0 mA95.4%
25.6 mA
25.0 mA97.7%
9.8 mA
10.01 mA97.9%
4.2 mA
5.01 mA83.0%