Purpose of test:  To measure the performance of a new PCB for 3-phase use. 

Hardware: My prototype 3-phase PCB with Vcc = 5V.  This board is being run with 
          all three phases in parallel because I only have single-phase power on the 
          premises.  

Software: A test sketch to measure and display the average power that is flowing on 
          each phase.  Each value is the average power over a three second period.  
          The software delays the samples from two of the voltage and current sensors so as to simulate a genuine 3-phase supply.

Method:   With the sketch running, insert a CT into each of the jack-sockets in turn.
          Apply a 2 kW load for a few seconds and then remove the CT.  The test data
          below has been annotated to show when each change occurred.

Results:  With no CT connected, background drift is minimal. When the CT is inserted, 
          drifts of approx 0.1 Watt are seen on each channel.  When 2 kW is applied to 
          one of the channels, there is no noticeable effect on the other two channels.  

Summary:  The absence of background drift and crosstalk between channels is most
          encouraging.  The performance would be likely to be even better in a genuine 
          3-phase environment.  This hardware would appear to provide a suitable platform
          for a   3-phase PV Router.

RAE, August 2014

----------------------------------
Sketch ID:  threePhase_measureOnly.ino
ADC mode:       free-running
Cycles per second set to: 50
sample sets per main cycle = 32.05
Triacs to be armed on cycle #14      <- not relevant for this sketch
Extra Features: none
powerCal for L1 =      0.0660  <- nominal value for 5V operation
phaseCal for L1 =      0.50
powerCal for L2 =      0.0660
phaseCal for L2 =      0.50
powerCal for L3 =      0.0660
phaseCal for L3 =      0.50
----

free RAM = 487
Go!
  -0.00  0.25  0.53   <- no CTs connected
  -0.00  -0.00  -0.00
  -0.00  0.01  -0.00
  0.00  -0.00  -0.00
  0.00  0.00  0.00
  -0.01  0.01  0.00
  -0.01  0.00  -0.01
  -0.05  -0.00  0.06  <- CT inserted into CT1
  0.03  0.08  0.04
  0.14  0.07  0.01
  0.08  0.04  -0.02
  0.15  0.12  0.04
  1039.02  0.06  0.00  <- 2 kW applied to CT
  1828.77  0.04  0.05
  1825.64  0.10  0.13
  1823.42  0.08  0.05
  1822.91  0.11  0.05
  1487.65  -0.03  0.01  <- current removed
  0.04  0.11  0.04
  0.13  0.12  0.04
  0.11  0.00  -0.01
  -0.00  -0.00  -0.00  <- CT disconnected
  -0.00  -0.01  -0.01
  0.00  -0.04  0.06  <- CT inserted into CT2
  0.00  0.15  0.04
  0.12  0.04  0.04
  0.10  -0.01  0.06
  0.12  1365.70  -0.02  <- 2 kW applied to CT
  0.08  1818.43  0.07
  0.11  1814.92  0.06
  0.14  1822.94  0.05
  0.08  1821.13  -0.03
  0.13  210.31  0.09   <- current removed
  0.16  0.05  0.09
  0.08  0.05  0.01
  0.13  0.18  0.02
  0.08  0.05  0.01
  0.03  -0.01  -0.00   <- CT disconnected
  0.01  -0.00  -0.00
  0.01  0.01  -0.00
  -0.01  -0.01  0.00
  0.11  0.11  0.06   <- CT inserted into CT3
  0.11  0.09  0.06
  0.08  0.06  0.04
  0.07  0.16  0.06
  0.18  0.05  1701.81  <- 2 kW applied to CT
  0.10  0.10  1837.16
  0.09  0.03  1832.54
  0.14  0.10  1828.41
  0.10  0.10  1827.18
  0.07  0.09  1698.93   <- current removed
  0.08  0.06  0.09
  0.10  0.10  0.04
  0.09  0.01  0.02
  -0.01  0.01  0.10
  -0.01  -0.00  -0.01
  0.00  -0.01  0.00
  -0.00  -0.01  -0.00
  0.00