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SV650.org - SV650 & Gladius 650 Forum (http://forums.sv650.org/index.php)
-   SV Talk, Tuning & Tweaking (http://forums.sv650.org/forumdisplay.php?f=111)
-   -   multimeter help please (http://forums.sv650.org/showthread.php?t=124726)

Stu 29-01-09 10:23 PM
multimeter help please
 
How do I us a multimeter to find out if a +ve and -ve wires are shorting together?
Thanks

Kilted Ginger 29-01-09 10:25 PM
Re: multimeter help please
 
more info required

yorkie_chris 29-01-09 10:34 PM
Re: multimeter help please
 
First guess resistance test. But yeah more info!

Learningcurve 29-01-09 10:37 PM
Re: multimeter help please
 
You need to put the black lead from your multimeter to an earth point (somewhere on the frame), then put the red lead on the ends of the two cables in turn.

Only the +ve should have a voltage reading if the switch for the circuit is turned off. If you have a voltage reading on the -ve wire, they are shorting.

Note: The switch for the circuit you are testing must be turned off to do this test!

Sid Squid 29-01-09 10:42 PM
Re: multimeter help please
 
Are you doing a leak test?

If yes, then set the meter to a resistance scale, (ohms, the Omega sign), a range of about 20 ohms is useful, make sure the bike is switched and off remove the leads from the battery, ensure that nothing touches the battery terminals. Clip the meter leads to the bike's battery leads, testing perfection requires no continuity at all, the real world says you may get a few ohms. If you get a significant reading disconnect the reg/rec, if the reading drops off the rectifier diodes are leaky.

theshed 29-01-09 10:43 PM
Re: multimeter help please
 
tutorial here
http://www.ladyada.net/library/metertut/index.html
hope that helps

Stu 29-01-09 10:56 PM
Re: multimeter help please
 
Quote:
Originally Posted by Sid Squid (Post 1765554)
Are you doing a leak test?

If yes, then set the meter to a resistance scale, (ohms, the Omega sign), a range of about 20 ohms is useful, make sure the bike is switched and off remove the leads from the battery, ensure that nothing touches the battery terminals. Clip the meter leads to the bike's battery leads, testing perfection requires no continuity at all, the real world says you may get a few ohms. If you get a significant reading disconnect the reg/rec, if the reading drops off the rectifier diodes are leaky.
thanks all, but we have a winner :cheers:
bit sneaky posting in SV tuning, but I'm soldering a gerbing wiring harness (I feckin hate soldering :mad:) so want to make sure I'm not shorting any wires.

So as you say set the MM to Omega - 200 is the smallest and it reads 1 if I short the multimeter it goes to 00.5 so just replicate that with my wiring & hope it stays at a big fat 1

Cheers me dears :D

Sid Squid 29-01-09 11:00 PM
Re: multimeter help please
 
200 ohms is fine. The shorted meter reading you get could be used as a correction, but a reading that small won't affect things.

Stu 29-01-09 11:02 PM
Re: multimeter help please
 
Hey it works to ensure I've got a good connection too. i.e. make sure it does fall to 0 instead of stay at 1 :D

Sid Squid 29-01-09 11:11 PM
Re: multimeter help please
 
I could do nothing else but recommend connecting the leads of the meter to whatever it is that you're trying to measure.

It's kinda the reason for having the wires on the meter see?


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