A) Ensure that the circuit is not powered
- Ensure that the circuit is not powered.
- Be certain the circuit is deenergized and discharged before connecting an ohmmeter.
- Do not apply power to a circuit while measuring resistance.
|PowerPole Polarity Checker Circuit Diagram|
From Hands-On Radio: Experiment 120: Power Polarity Protection, January 2013 QST; copyright ARRL
|NJ2X builds the polarity checker on a solderless breadboard as a test|
|NJ2X drills four holes in a small cap for the LED leads|
|NJ2X testing the soldered polarity checker prior to final assembly|
|NJ2X's Anderson PowerPole polarity checker fully assembled|
|Tektronix Type 422 Oscilloscope|