How not to blow yourself up
May22
Today I took off my technical director’s hat and put on my radio engineer hat, to do a service call for a radio station three and a half hours away. Had a disappointing day trying to fix a IP codec box that feeds the signal from the Daytona Beach mother station to the remote station 150 miles away. Besides the problem that the DSL line was being used by a TV station in the same building for streaming, without our permission, the IP codec was dead.
I brought a power supply and figured it would fix it, unfortunately the power supply did not bring the device back to life. Being the technician that I am I broke out my trusty Fluke meter and started probing to make sure everything was receiving power, in my testing I decided to make sure power was getting through the filter at the power inlet and there wasn’t some unseen fuse blown. I moved the probe in and WHAM! I shorted the hot side to the case, sparks went flying and I saw life flash before my eyes (or maybe that was just the flash from the 120v). I have worked on a lot of powered up electronics and transmitters, and have never done something like that before. I have seen plenty of sparks and flames with FM and AM transmitters when the high voltage arcs across a bad component, but never had it happen from my hands before.
Now my meter probe now bears the scars of 120 VAC shorted to ground, and I learned what happens when you do something stupid. I will make sure I am more careful next time, like I normally am.