Panametrics DigitalFlow GS868, Руководство по программированию, Страница: 28 / 146

Chapter 1. Programming Site Data
18 DigitalFlow™ GS868 Programming Manual (2-Channel)
Both the upstream and downstream transducers transmit ultrasonic pulses in bursts, which consist of a series of
transmit pulses. XMIT SAMPLE SIZE determines how many bursts are sent in one direction 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.
13. Press [ENT] to accept the current M>S_Switch value or enter a 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 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 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.