Configuring Meter Inputs
ARC Plus Version 3 Instruction Manual
49
Meter Type
Your selection for calibration type determines how the ARC Plus scales the raw input value:
Millivolt
Does not scale the raw input voltage; it applies a calibration constant
of 1. A 300mV sample will be displayed as 300 on the ARC Plus, and
the channel cannot be manually calibrated.
Linear
Multiplies the raw input voltage by a calibration constant that is
determined by comparing the sample voltage to the value entered
during manual calibration. The Linear (Absolute) input type displays
the absolute value of a linear input, and the Linear (Negative) input
type is used for values with a negative voltage input; positive values
are clipped to 0.
Degree
Divides the raw input voltage by a 0.1 to show temperature readings
from the Burk Technology BTU-4 temperature unit, which provides a
10mV / degree output. The decimal setting for channels configured
for degree is locked at 1 (000.0).
Indirect
Multiplies the raw input voltage by the scaled value of the previous
channel and multiples the product by a calibration constant.
Squared
Squares the raw input voltage and then multiples the product by a
calibration constant.
Setting the Voltage Range
Note: The Voltage Range is only configurable when using legacy PlusBus units.
Under the
Voltage Range
heading, select the input range that most closely matches the
expected range of sample values. Supported input ranges are (-5 to 5), (0 to 5), (-10 to 10), and
(0 to 10).
Sample Type and Timing
The ARC Plus can optionally take an average, minimum or maximum of a meter channel. To
select this behavior, use the
Sample Type
column. Set the timing (in seconds) from the
Sample
Time (sec)
column.
For example, to use the average value of a channel over a one-minute period, select
Average
for
the Sample Type, and enter
60
in the Sample Time column.
Decimal Places
Use the
Decimal Places
column to select the location of the decimal place when the ARC Plus
reports the channel reading. For example, a scaled value of 1200 can also be displayed as 1.200,
12.00 or 120.0.
