PD662 Loop-Powered Meter
Instruction Manual
22
Signal Input Conditioning Function (
Fnc
)
The PD662 provides linear and square root signal input conditioning
functions for inputs from linear and non-linear transmitters.
Linear (
Lnr
)
Meters are set up at the factory for linear function using two-point linear-
ization. Multi-point linearization with up to 32 points may be used. The
linear function provides a display that is linear with respect to the input
signal between each set of input points.
Square Root (
sqr
)
The square root function is used to linearize the signal from a differential
pressure transmitter and display flow rate in engineering units.
Information Menu (
info
)
The Information menu is located in the
Advanced
Features
menu, to ac-
cess Information menu see Advanced Features Menu on page 20.
It shows software identification number, version number, and calibration
temperatures. To determine the software version of a meter:
1. Go to the
Information
menu (
info
) and press
Enter
button.
2. The meter will automatically scroll through the software release
number and software version. The meter temperatures at the
time of last internal calibration in
°
C and
°
F are displayed for
calibration troubleshooting. Pressing the
ENTER
,
RIGHT
, or
UP
buttons will progress the information display.
3. Following the information display, the meter will exit the
Advanced
Features
menu and return to run mode.
Input Signal Filter (
FIL
)
The noise filter is available for unusually noisy signals that cause an
unstable process variable display. The noise filter averages the input
signal over a certain period. The filter level can be set to low (
LO
), high
(
HI
), or off (
OFF
). The higher the filter setting, the longer the averaging
time and so the longer the display may take to find its final value.
The filter contains a noise filter bypass feature so that while small
variations in the signal will be filtered out, large, abrupt changes to the
input signal are displayed immediately.
