Precision Digital PD662 - Manual (Page 22)

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.