| General > General Technical Chat |
| Just Replace the Fuse and You're Good!! |
| (1/5) > >> |
| engrguy42:
Ok, so y'know how the dumbest thing anyone can say in the electrical world is "Oh, no wonder!! The fuse blew!! Just replace it and you're good to go!!"? (Of course the reason is that fuses don't blow all by themselves, they need an overcurrent first.) Anyway, I had a power meter I bought a while ago (the kind you plug into the wall outlet to measure V, I, Watts, etc.). And when I received it it was DOA. Nothing on the LCD display when I plugged it in. So I was gonna send it back, but decided with all this covid crap I'd hang on to it. So I took it apart, and first thing I tested was the 0.2 A fuse that feeds the measuring circuit. Son of a gun, it was open!!. So I'm thinking there's a shorted component from the factory, so I open it up and look around. Nothing obvious, so I give it 15 volts from my waveform generator and hook up my scope and it seems to be doing okay. So after some head scratching I figure, "what the heck, I'll just plug it into the wall, and instead of the fuse I'll run some wires to my ammeter and see what happens. I'll just quickly touch the leads to the wires and measure the current." And what do you know, it read only 40mA. And the LCD display came on, and was reading 121 volts. :-// Maybe the fuse broke in shipping? Or it was bad from the start? This is all, like, weird and stuff..... :wtf: |
| Messtechniker:
Of course fuses sometimes blow for no apparent reason. That's why I always have suitable spare fuses ready when doing field recordings, for example. |
| engrguy42:
--- Quote from: Messtechniker on May 21, 2020, 08:13:12 pm ---Of course fuses sometimes blow for no apparent reason. That's why I always have suitable spare fuses ready when doing field recordings, for example. --- End quote --- You mean, like, magic and stuff?? :D |
| Gregg:
Note the very short lead on one side of the fuse. It probably weakened the fuse link when it was soldered and rattled open in shipping. |
| engrguy42:
The weird thing is it came in one of those formed, clear plastic covers. I'd think that would give a lot of protection inside the shipping box. I dunno. Maybe it's just one of those things. |
| Navigation |
| Message Index |
| Next page |