From: amdx@knology.net   
      
   On 9/25/2011 11:43 AM, Johny B Good wrote:   
   > On Sun, 25 Sep 2011 14:17:50 +0100, OilLamp   
   >  wrote:   
   >   
   >> On Sep 20, 9:07 am, "Jim Wilkins"  wrote:   
   >>> "danny burstein"  wrote in message   
   >>>   
   >>> news:j5a1b8$nv3$1@reader1.panix.com...   
   >>>   
   >>> > In  "Jim Wilkins"    
   >>> > writes:   
   >>>   
   >>> >>> Does the killowatt have a problem reading accurately with UPS units?   
   >>>   
   >>> >>I just checked a KAW P4400 with two stepped square wave inverters   
   >>> and a   
   >>> >>60W   
   >>> >>incandescent lamp. It shows 111V 55W and 129V 59W. I see odd   
   >>> readings on   
   >>> >>the   
   >>> >>input of a UPS too, but they have always been higher than expected.   
   >>>   
   >>> > Have you had a chance to check the power draw   
   >>> > of that "60 watt" lamp when it's plugged directly   
   >>> > into the outlet (that is, no UPS inline)?   
   >>>   
   >>> It's my standard inverter test load. The wattage varies with line   
   >>> voltage of   
   >>> course, and probably the age of the bulb as tungsten evaporates off the   
   >>> filament. Typically this one reads 55W at 120V. This morning the line   
   >>> is at   
   >>> 122.6V and the bulb draws 58W.   
   >>>   
   >>> I don't have another way to measure AC power that's significantly more   
   >>> accurate than a KAW. Except for one old Amprobe my clamp-on current   
   >>> meters   
   >>> pretty much agree with it. An in-cal analog oscilloscope with voltage   
   >>> and   
   >>> current probe is typically assumed to be accurate to ~3%, and mine   
   >>> are long   
   >>> out of calibration.   
   >>>   
   >>> jsw   
   >>   
   >> Consider stocking up on your standard inverter test load. They may   
   >> become scarce in the future.   
   >>   
   > That's not a problem for me. That single 150W lamp I used in my meter   
   > test is one of three that I've taken out of the box of 25 I acquired as   
   > a free gift a couple of decades back. ;-)   
   >   
   >   
      That reminds me, about a year ago I bought 12-150 watt floodlights at   
   a garage sale for $5. I got them home and tried one, defective, number   
   2, defective 3 thru 12 defective. I went back to get my money back and   
   the guy said "what do you think I'm am, Walmart? I didn't tell him what   
   I thought he was, but an argument went on until I got my $5 dollars   
   back. Thought for a time I would have some physical discomfort!   
                                      Mikek   
      
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