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#207456 - 10/30/12 04:00 PM Looking for a good portable power supply  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,317
Alaska
I am in the market for a good manufacter or power supply thats portable for calibrating meters in the field, bench testing equipment, circuits and such. Any suggestions?


"Live Awesome!" - Kevin Carosa

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#207461 - 10/30/12 05:42 PM Re: Looking for a good portable power supply [Re: sparkyinak]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
How accurate do you need it? What voltages and current?

I have a 450w PC power supply on my bench for doing some of these things.
You get +12, +3.3 and +5 VDC at pretty good amps. the -12 and -5 don't have much oomph.


I wouldn't trust it to calibrate a meter tho. If you really want a meter to be right, you need to send it to a lab.


Greg Fretwell

#207495 - 10/31/12 11:31 PM Re: Looking for a good portable power supply [Re: sparkyinak]  
NJwirenut  Offline
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Joined: Sep 2001
Posts: 806
Bergen County, NJ
If you are calibrating meters, what you want is a "voltage standard", not a power supply. I use one of these on my test bench at work:

http://www.ebay.com/itm/EDC-Model-M..._DefaultDomain_0&hash=item3f1e20bfd8


#207498 - 11/01/12 08:09 PM Re: Looking for a good portable power supply [Re: NJwirenut]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,317
Alaska
Unfortunetly my employer don't buy used equipment


"Live Awesome!" - Kevin Carosa

#207499 - 11/01/12 08:11 PM Re: Looking for a good portable power supply [Re: gfretwell]  
sparkyinak  Offline
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Joined: Jul 2007
Posts: 1,317
Alaska
Since i'll be calibrating meters, it has to be accurate


"Live Awesome!" - Kevin Carosa

#207500 - 11/01/12 10:23 PM Re: Looking for a good portable power supply [Re: sparkyinak]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
If you are buying a brand new voltage standard, you may be spending enough money to make that lab I was talking about look attractive. How many meters are you going to be maintaining?
IBM did in house calibration but they had about 10,000 pieces of equipment to keep ISO 9000 compliant.

You also need to calibrate the standard every so often too (I am not really sure what that I9k criteria is these days)


Greg Fretwell


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