VRC2000 Installation and Operations Manual Page 37
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inputs are primarily used to calculate power readings (Power = Current *
Voltage). The VRC2000 will say [I] to indicate an indirect configuration.
Indirect values are obtained by multiplying the values of the two previous
consecutive metering channels readings together. See the examples below.
Example 1
Indirect value for metering channel 3 =
(sample for metering channel 1) * (calibration constant for metering
channel 1)
*
(sample for metering channel 2) * (calibration constant for metering
channel 2)
*
calibration constant for metering channel 3
Example 2
Indirect value for metering channel 1 =
(sample for metering channel 16) * (calibration constant for metering
channel 16)
*
(sample for metering channel 15) * (calibration constant for metering
channel 15)
*
calibration constant for metering channel 1
CHANNELS 1 AND 2 NOTE:
As shown in Example 2, denoting an indirect value for metering channels 1 and
2 will result in calling up values from metering channels 15 and/or 16 (the two
previous channels).
Power Readings. Metering channels defined as power readings
mathematically square the input to the metering channel, then multiply the
result by the calibration constant. The VRC2000 will say [P] to indicate a
power configuration. Power readings automatically square the value of a
metering channel’s input sample.
Power values = [(sample) * (sample)] * (calibration constant)
METER CHANNEL OVERLOAD NOTE:
Be very careful not to overload any of the metering channels with excessive
voltage or current. Overloads can seriously damage your VRC2000.
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