From: muratlanne@gmail.com   
      
   "Wu Ming"  wrote in message news:vjqm0c$1d9ru$3@dont-email.me...   
      
   Jim Wilkins  wrote:   
   > Look into the Kill-A-Watt or the PZEM-061 wattmeter.   
   >   
   > If you want to record data automatically a pair of PC-connected   
   > multimeters   
   > like the TP4000ZC can transmit current and temperature readings to a file   
   > in   
   > a computer. A spreadsheet can open the files as type .CSV to combine the   
   > separate log files, aligned by matching the timestamps. You should measure   
   > current with a separate AC clamp-on probe instead of running line power   
   > through the multimeter.   
   >   
      
   Would a smart plug also do?   
   ----------------------------------------------   
   It might. The Kill-A-Watt P3 shows the present value of Voltage, Amperage,   
   Watts or Volt-Amps, and the accumulated KWH and Hours:Minutes since it was   
   turned on. Its resolution is 0.01 KWH which may not be adequate for a small   
   appliance. The PZEM-061, which has more exposed wiring and is meant to be   
   enclosed, reads to 1 Watt-hour, better resolution at low power levels, plus   
   it can operate from 240V and measure up to 100A. I haven't tried other smart   
   plugs or AC power meters as these are good enough for me.   
      
   For both you would have to record the electrical values, temperature and   
   time at intervals to plot the data. They will do if you aren't busy with   
   something else. They won't easily show you the cycle timing of an on/off   
   thermostat but you can watch them to see the current turn on and off.   
      
   --- SoupGate-Win32 v1.05   
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