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Rate of Change Meter
A configuration mode of the
Extended meter
which allows the display of rate
based on successive readings. The conversion to engineering units is achieved
with the combination of a multiplier from 0.1 to 10,000 and a scale factor.
Reading
The value displayed by the meter. “Taking a reading” is the action of the meter
to make an analog-to-digital conversion. Readings are taken at 60/sec with 60
Hz power or 50/sec with 50 Hz power, and are displayed with an update rate of
3.5/sec with 60 Hz power or 3.0/sec with 50 Hz power.
Remote Display
A display mode which allows the meter to serve as a remote display to another
meter when connected to it by a 4-wire phone cord. Also allows the meter to
transmit raw measurement data to a computer and then display processed data
from the computer. A serial communications option board is required in the
meter. If such a board is not installed or no serial data is received, the meter
displays
rESEt
.
Reset
See “Function Reset” and Meter Reset.”
RS485 Half Duplex
Serial communications implemented with two wires, allowing data transmission
in both directions, but not simultaneously.
RS485 Full Duplex
Serial communications implemented with four wires, allowing data transmission
in two directions simultaneously.
Run Mode
The normal operating mode of the meter, where readings are taken, as opposed
to the
menu mode
.
Scale
A constant multiplier used to go from A/D
converter counts to displayed counts. This is
the slope term
m
in the straight line formula
y
= mx + b
, where
y
is the displayed reading in
counts,
m
is the scale factor,
x
is the measured
reading in counts, and
b
is the offset. For direct
readout in (milli)volts or (milli)amps, scale is 1.
Scaling
The process of setting
scale
and
offset
so that
the meter converts analog-to-digital con-
version counts to engineering units (such as
psi).
Scaling, Coordinates of 2 Points Method
A scaling method where four numbers are entered manually: low input, desired
reading at low input; high input, and desired reading at high input. The meter
then applies a straight line fit. The decimal point is set by the separate
dEC.Pt
menu item.
Scaling, Scale and Offset Method
A scaling method where
scale
and
offset
are entered manually.
