[time-nuts] Watts Up (was Re: Prologix GPIB/USB converter help...)

Tom Van Baak tvb at LeapSecond.com
Tue Apr 17 22:44:31 UTC 2007


>...
> If you have the capability of testing your WUPs, I'd certainly be
> interested in what you find.  I'd like to think that maybe the problem
> is in just this one revision of firmware.  But I suspect not.
> 
> John

Thanks much for your thoughts about the WUP. I might have
guessed there were power-nuts out there! Very interesting.

I guess I haven't worried about the power factor. What I do
very much like about the WUP is the well-designed (and even
documented) serial interface, the choice of command/response
or periodic talk-only modes, and the clean design inside.

You can see some of my WUP power plots here:
http://www.leapsecond.com/lab/lab.htm

I have not done much accuracy testing. For my lab, at
this point at least, I'm much more concerned with power
stability than accuracy. One of my big surprises was that
none of my fancy UPS's give good power stability, so I'm
migrating to "online" or "double conversion" UPS's which
solve this problem.

BTW, one digital power meter that I gave up on is:
http://www.brandelectronics.com/meters.html
Would appreciate any comments you have on this.

The other power meters I'm using are by DMMetering.
See eBay item 170102236411 and others by the same
seller. These are 800 pulses per kWh and I log their
data using a Newport/Omega iFPX internet counter:
http://www.newportus.com/i/ifpx.htm

I've monitored DC power with these two:

RC Electronics, Watts UP WU100
http://www.rc-electronics-usa.com/
http://www.powerwerx.com/category.asp?CtgID=3587

Medusa Power Analyzer II
(yet another vendor that dropped RS232 for USB)
http://www.medusaproducts.com/
http://www.westmountainradio.com/PWRmetersRC.htm

/tvb





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