Mobile Device Power Monitor Manual - Monsoon Solutions

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The resistance of 20 gauge wire is 0.012 Ω/ft, so if the cables are 20 gauge, and 1 foot in
length, that adds another 0.024 Ω, in addition to the contact resistance.
Figure 10: Vout LED indicator
If the power-up is successful, the green Vout LED indicator in Figure 10 above will powerup.
This LED is connected directly to Vout, so the light will dim slightly if the voltage is
lowered. If this LED does not power-up, then Vout did not power-up properly, so there are
other problems.
Over-Current Error from the Main Power Supply
Sometimes an over-current error occurs when powering-up. When an over-current error
occurs, the amber LED powers-up, and the green LED for Vout powers-down.
An over-current error can happen when the:
• Device is attached backwards.
• Device is attached incorrectly.
• Device has a lot of capacitance, a very high in-rush current.
• Device has an unusually high run current.