Better (less-explodey) way to test an inductive sensor?

  • So - I recently grabbed an inductive sensor (LJ12A3-4-Z/BX), NPN, rated between 6-36v. I wanted to make sure that when I hooked it up to my duet, it wouldn't cook the board from the 24v output from my power supply. After a short bit of prodding, my readings came to a halt with a pretty unenthusiastic pop and me taking 5 seconds to realize the LED on the inductive sensor had gone kaput.

    Here's what I did:
    Entirely unhooked the duet from the power supply.
    Clipped the 24+ to the V+ on the sensor from the power supply.
    Clipped the v- to the - on the power supply.
    Clipped my multimeter common lead to the v- and other lead the V+ and got 24v. (That's good?)
    Sat the inductive sensor next to some alan wrenches I had kicking around to get the sensor to stay on, then tried to probe the signal output to make sure it would be a reasonable range after attaching a diode, which is about when it died.

    Is there a better way to test this? I realize blowing up components is part of the fun of learning electronics, but I'd rather keep my duet safe from my own learning experiences. 😄

  • administrators

    What you did sounds ok to me, assuming you identified the + and - wires correctly. Maybe you must had a bad sensor.

  • Thanks! I'll give it another go once a replacement arrives in the mail. 🙂

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