Campbell Scientific CS11-L Current Transformer - Manual (Page 16)

CS11-L Current Transformer
Current(3). The measured current in Amps rms for each of
the three line conductors.
VphaseI(3). The measured phase angle in radians that the
voltage leads the current for each of the three line
conductors. The cosine of VphaseI is the power factor.
VHarmRatio(3). The measured voltage harmonic distortion
ratio given as the total harmonic content divided by the
fundamental content at LineFrq Hz for each of the three line
conductors. VHarmRatio is unitless.
IHarmRatio(3). The measured current harmonic distortion
ratio given as the total harmonic content divided by the
fundamental content at LineFrq Hz for each of the three line
conductors. IHarmRatio is unitless.
6. Programming
SCWin users: This manual was written primarily for those whose
needs are not met by SCWin. Your procedure is much simpler:
just add the CS11-L (in the Miscellaneous Sensors folder), save
your program, and follow the wiring shown in Step 2 of SCWin. NOTE
The datalogger is programmed using either CRBasic or Edlog. Dataloggers
that use CRBasic include our CR200(X)-series, CR800, CR850, CR1000, and
CR3000. Dataloggers that use Edlog include our CR500, CR510, CR10(X),
CR21X and CR23X. In CRBasic, the VoltSE instruction is used to measure
the sensor. In Edlog, a P1 instruction is used.
In order to monitor the amperage of an alternating current circuit, the program
must take many samples from the CS11-L sensor to capture the waveform over
a specified time, and then calculate the average energy under the curve. There
are many methods to do this, depending on the datalogger, the untapped
programming capacity, and other factors.
TABLE 6-1 shows the maximum amperage for each datalogger, depending on
the range code.
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