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Help using mutimeter

Posted: March 24th, 2007, 2:55 pm
by carpediem
Hello
I have blown a speaker and fuse, I was installing my OEM tape deck into my mx-3 and touched the ground(black) to a speaker wire and I fried my deck and blew a speaker (i think) and a fuse, so I chaged the fuse, and now I need to test the speakers to see if that is my problem
I installed a old jensen cd deck and it turns on for a split second and then off then on again in a looop, probably because a speaker is kaput and I dont know what to look for when using my multimeter
things I need to know are what setting should I set my (analog)multimeter to test and what readings should look like for speakers that work/arent working anymore
My multi meter has a dial in the middle and has these settings:
DCV*500
" "*250
" "* 10
DCA*500u
" "* 10m
" "*250m
BAT* 9V
" "* 1.5V
ACV*500
" "*250
" "* 10
OHM*RXIO
" "*RXIK

I have a feeling I need to test with DCV but still not sure if DCA is what shoul be testing on and what setting within the DC should be set at

Posted: March 24th, 2007, 3:36 pm
by ariesdude
If you want to test if the speaker is still ok - you need to check the resistance of the speaker (OHM setting in the multimeter). It should read about 4 - 8 ohms i think. Basically it reads zero then there is a short and if it reads nothing or really high resistance value (like 10 mega ohms) then there is a open circuit somewhere.

Also analog meters have a weird scale where it might read zero only when the needle goes all the way to the right - be aware of that.