GE DigitalFlow GS868, Programming Manual

Page: 31 / 171

Programming Site Data 1-23
March 2008
Setting Transducer Signal
Limits (cont.)
The number of shifts corresponds to the actual number of transmits
per cycle (number of signals added together in one direction to
produce an averaged signal for one interrogation of the fluid) and
need only be changed if the environment is very noisy or the acoustic
signal is weak. The default value for this parameter is 3 and values
from 0 to 10 are acceptable.
15.
Press
[ENT]
to accept the current A Divisor value or enter a new
value and press
[ENT]
.
A Divisor
is used in the calculation of the Measure Mode integrated
threshold level and is not normally changed. The default value for this
parameter is 2.5 and values from 0.1 to 10 are acceptable.
16.
Press
[ENT]
to accept the current # Transmit Pulses value or enter a
new value and press
[ENT]
.
IMPORTANT:
Consult the factory before performing this step.
# Transmit Pulses
specifies the number of pulses in a burst. The
default value for this parameter is 4 and values from 1 to 16 are
acceptable. For difficult conditions (i.e., long paths, high velocity or
high temperature), settings as high as 16 may be necessary.
17.
Press
[ENT]
to accept the current T WINDOW (Cycles) value or
enter a new value and press
[ENT]
.
IMPORTANT:
Consult the factory before performing this step.
Normally, the Model GS868 calculates the size of the transmit
window based on pipe size and fluid sound speed. However, for
special diagnostic purposes, it may sometimes be necessary to reset
the window size. The default value for this parameter is 0 and values
from 0 to 1000 are acceptable.
18.
Press
[ENT]
to accept the current R WINDOW (cycles) value or
enter a new value and press
[ENT]
.
IMPORTANT:
Consult the factory before performing this step.
Normally, the Model GS868 calculates the size of the receive window
based on pipe size and fluid sound speed. However, for special
diagnostic purposes, it may sometimes be necessary to reset the
window size. The default value for this parameter is 10 and values
from 10 to 128 are acceptable.
After completing these steps, the program returns to the
SETUP
window.