bleeder
06-30-2004, 05:50 PM
I have this old analogue mm I'm figuring out how to use.
I learned how to measure dcv so far.
The black probe is in (-)COM and the red in (+)V-ohm-A
between them it says 250ma max
would some things be higher than .25 amps though?
I was trying to measure dc amps on a psu I'm testing with.
My function nob has these for DCA: 250m, 50u <--(cursive u) (250mV)
So I was trying to measure the 12v rail, but set on 250m, when I have the black probe on ground and the red probe on the 12v, it simply kills the psu. When its on the other 50u, it just shoots all the way to 0 (dont know what scale they are using in these settings)
What does this mean, whats going on?
Also, I have two more plugs for the probes, they are OUTPUT and (+)DC 1000V
When would I use these?
One last thing, is that the tips of my probes are a little thick, not very pinpoint precise. Would it affect anything if I filed/sharpend them to a finer point for more presision?
Thanks :)
I'll probly be buying a cheaper dmm at radio shack next time I go there too :cool:
I learned how to measure dcv so far.
The black probe is in (-)COM and the red in (+)V-ohm-A
between them it says 250ma max
would some things be higher than .25 amps though?
I was trying to measure dc amps on a psu I'm testing with.
My function nob has these for DCA: 250m, 50u <--(cursive u) (250mV)
So I was trying to measure the 12v rail, but set on 250m, when I have the black probe on ground and the red probe on the 12v, it simply kills the psu. When its on the other 50u, it just shoots all the way to 0 (dont know what scale they are using in these settings)
What does this mean, whats going on?
Also, I have two more plugs for the probes, they are OUTPUT and (+)DC 1000V
When would I use these?
One last thing, is that the tips of my probes are a little thick, not very pinpoint precise. Would it affect anything if I filed/sharpend them to a finer point for more presision?
Thanks :)
I'll probly be buying a cheaper dmm at radio shack next time I go there too :cool: