GE Panametrics GF868 Programming Manual page 35

March 2003
Setting Signal Limits
(cont.)
1-26
Both the upstream and downstream transducers transmit ultrasonic
pulses in bursts, which consist of a series of transmit pulses.
determines how many bursts are sent in one direction
SAMPLE SIZE
before sending in the other direction. The default value for this
parameter is 8 and values of 2, 4, 8, 16 and 32 are acceptable.
12.Press to accept the current M>S_Switch value or enter a
[ENT]
new value and press [ENT]
IMPORTANT: Consult the factory before performing this step.
If the burst mode is set to Skan/Measure (S/M), the meter switches
from Skan to Measure Mode when Delta T is less than the
value. DO NOT change this value unless advised to do
M>S_Switch
so by the factory. The default value for this parameter is 50 µsec and
values from 0 to 250 µsec are acceptable.
13.Press [ENT] to accept the current # shifts value or enter a new
value and press
[ENT]
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.
14.Press to accept the current A Divisor value or enter a new
[ENT]
value and press [ENT]
is used in the calculation of the Measure Mode integrated
A Divisor
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.
15.Press to accept the current # Transmit Pulses value or enter
[ENT]
a new value and press
IMPORTANT: Consult the factory before performing this step.
specifies the number of pulses in a burst. The
# Transmit Pulses
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.
16.Press to accept the current T Window (Cycles) value or enter
[ENT]
a new value and press
IMPORTANT: Consult the factory before performing this step.
Normally, the Model GF868 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.
.
.
.
.
[ENT]
[ENT] .
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