From: muratlanne@gmail.com   
      
   "Johny B Good"  wrote in message   
   news:op.v137d1elkd9x7s@fred...   
   > On Tue, 20 Sep 2011 13:31:15 +0100, Jim Wilkins    
   > wrote:   
   >...I see odd readings on   
   >> the   
   >> input of a UPS too, but they have always been higher than expected.   
   >>   
   >   
   >  When you say higher than expected, do you mean, for example in the case   
   > of an APC SmartUPS 700, higher than the expected 20W maintenance load   
   > (fully charged battery, or, indeed, no battery at all)[1] plus the load,   
   > say 100W, giving a reading higher than the expected sum total figure of   
   > 120W?   
   >   
   > Regards JB Good   
      
   The UPS in question is a Tripplite 1050 I bought second-hand with apparently   
   bad batteries, which recovered nearly their full capacity after a few test   
   cycles.   
      
   I thought its initial power demand was ~60W but noticed a brief peak of 100W   
   after posting that. I had seen ~130W with a laptop plugged in and booting.   
   Now it makes sense.   
      
   That laptop is becoming a data logger. Yesterday I added a dual serial port   
   PC card to run both a Dataq DI-194RS four channel A/D and a serial-output   
   Radio Shack DVM. Since the meter isn't fast enough to catch inrush or   
   switching supply current I got some of these to use with the 194:   
   http://www.gmw.com/magnetic_sensors/asahi/current-sensors-HA.html   
   and ordered these to read thermocouples:   
   http://parts.digikey.com/1/parts/2004324-ic-thermocouple-a-w-com   
   -8msop-ad8495crmz.html   
      
   The 400MHz laptop draws only ~8W with the screen off and should run for days   
   from a truck battery.   
      
   jsw   
      
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