DigitalFlow™ GF868 Programming Manual (1-Channel) 25
Chapter 1. Programming Site Data
1.10.1 Setting Transducer Signal Limits (cont.)
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 M>S_Switch value. DO NOT change this value unless advised to do so by the factory. The default value for this
parameter is 50 sec and values from 0 to 250 sec are acceptable.
14. 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.
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 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.
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 GF868 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 300 are acceptable.
Note: If the T WINDOW prompt is set to 0, the R WINDOW prompt does not appear, and the GF868 uses a R
WINDOW Width based on the expected arrival of the signal.
After completing these steps, the program returns to the SETUP window. Table 2 on the next page lists the default values
and limits for SETUP parameters.
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