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Im turning a cheapy 650w power supply into a bench psu

Just to make sure I can use it to power anything ive got a circuit that makes 12v variable from 0 to about 11.2v

To see what voltage im at ive got a cheapo tiny electrical meter with lcd readout.

hooking everything up it works perfect when the test meter is running on batterys but not when running on the psu's 12v (yes the multi meter is 12v)

When running on batterys it reads voltages perfectly (although I did need to put an led, a load, on the output from the variable voltage controller to get a stable output from it)

Problem obviously when I try running on the psu, the display just cannot read the voltage and I have no idea why

So my question is that is there some sort of way that I can "seperate" the multi meter from the same voltage supply as the multi meter so that although they are both connected to the same supply they in theory dont see eachover?

I hope that makes sense

I know one easy way to do it would be just to power the multi meter from a battery and use a relay to turn it on with the psu but I would prefer not to use batterys.

I hope someone with a bit of electrical know how can help me out.....
My Beast
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My Beast
(16 items)
 
  
CPUMotherboardGraphicsRAM
3770k @ 4.5 HT On 1.3v Delidded Asrock Z77 Extreme4 HD4000/Onboard Hynix CFR Modules 8gb (2x4gb) @ 2200 @ 1.55v 
Hard DriveHard DriveOptical DriveCooling
OCZ Vertex 4 256gb Seagate Barracuda 7200.14 2TB ST2000DM001, 1TB ... Pioneer BDR-207EBK Blu-Ray Writer Noctua NH-C14 
OSMonitorKeyboardPower
Windows 8 Pro 64-bit BenQ 21.5" G2222HDL Logitech G19 Cooler Master Silent Pro M2 720w 
CaseMouseMouse PadAudio
CoolerMaster Haf XB Logitech M600 none Onkyo TX-NR515 5.1 Surround System 
  hide details  
Reply