Campbell Scientific CS11-L Current Transformer - Manual (Page 14)

CS11-L Current Transformer
MaxVrms The MaxVrms parameter is the expected maximum rms
(root mean square) voltage to measure. MaxVrms is
specified at the primary of the potential transformer, or
equivalently, the non-datalogger side of the potential
transformer. Typical values are 120 or 240. The datalogger
uses VMult and MaxVrms to calculate which input range to
use for the voltage measurement.
ChanI The ChanI parameter is the single-ended channel for the
current measurement. For single-phase configurations
(ConfigAC = 1) with RepsI greater than 1, the datalogger
makes multiple current measurements on increasing
consecutive channels starting at ChanI. For split-phase
configurations (ConfigAC = 2), the datalogger makes two
current measurements on increasing consecutive channels
starting at ChanI. For three-phase configurations
(ConfigAC = 3), the datalogger makes three current
measurements on increasing consecutive channels starting at
ChanV.
IMult The IMult parameter is the current transformer multiplier as
input amps per output mV. A typical value is 15 amps/333
mV (or 0.045045).
MaxIrms The MaxIrms parameter is the expected maximum rms
current to measure. MaxIrms is specified at the primary of
the current transformer, or equivalently, the non-datalogger
side of the current transformer. The datalogger uses Imult
and MaxIrms to calculate which input range to use for the
current measurement(s).
RepsI The RepsI parameter is the number of current measurements
to make on consecutive single-ended input channels. This
parameter is used only in configuration 1 and is ignored by
the datalogger for configurations 2 and 3.
Results Returned
In each of the three configurations, DestAC may be a single-element variable
or a dimensioned variable array. The ACPower instruction will store as many
results as will fit in DestAC.
If the LineFrq value is between 2 and 20, inclusive, (for example, the expected
frequency is not known or “wild”), the phase (VPhaseI) and harmonic ratio
(VHarmRatio) will not be included in the results.
ConfigAC = 1 Returns a maximum of 3 + 4•RepsI values in the following
order:
Power(RepsI). The real power in Watts measured by the
voltage and each current measurement, repeated to give
RepsI values.
MeasFrq. The measured voltage frequency in Hz.
Voltage. The measured voltage in Volts rms.
8