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Author Topic: testing power supply  (Read 317 times)

pinkyCrook

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testing power supply
« on: July 04, 2013, 07:19:04 PM »
hola!  i'm what you'd call a newbie, so please bear with me...

i'm having issues checking AC voltage, on the provided power supply.  i've got a DMM (sinometer ms8268) and the auto range function is giving me an unstable readout (jumps around, giving wildly different values) when touching the black lead to V- and the red lead to V+, on the power supply.  when touching the black lead to ground (green/yellow) and the red to either V- or V+ i get a reading of ~2.5 (and it slowly increments up, from there).

can anyone tell me what i'm doing wrong, or what the issue might be?

note: the DMM reads a 9v battery @9.09v and my wall outlet @121.3v...so i'm guessing the problem doesn't lie with it?

cheers,
-j

p.s. i've turned the trim pot screw all the way, clockwise and counter clockwise, with little change.
cheers,
-j

jit

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Re: testing power supply
« Reply #1 on: July 09, 2013, 06:23:38 PM »
V- and V+ are supposed to be electrically isolated from those other terminals.  They are DC, the others are AC.

Set the voltmeter to DC.  Put the black probe on V-, and the red probe on V+, and see if you get a sensible reading.

(Sorry about the long delay in replying  --  I think the moderators have all been away on vacation.)
Bukobot Duo v1

pinkyCrook

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Re: testing power supply
« Reply #2 on: July 09, 2013, 06:32:35 PM »
i guess that explains the wonky readings. :o thanks!  i'm looking forward to trying it out ASAP.

cheers,
-j
cheers,
-j

pinkyCrook

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Re: testing power supply
« Reply #3 on: July 11, 2013, 01:39:43 AM »
thanks again, jit...my ignorance was indeed the culprit!


cheers,
-j
cheers,
-j

 

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