GE DigitalFlow DF868 Programming Manual page 43

March 2008
Transit-Time SIGNL
Options (cont.)
1-34
[F1]-[F4]
11. Use the [→] and
XMIT Sample Size
the from the option bar.
Both the upstream and downstream transducers transmit ultrasonic
pulses in bursts, which consist of a series of transmit pulses.
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.
[ENT]
12.Press to accept the current
value (0 to 16) and press
Use this prompt to enter the number of errors the DF868 can record
before it displays an error message. The default value is 6.
[ENT]
13.Press to accept the current Minimum Peak % Limit or enter a
[ENT]
new value and press
Use this prompt to enter the minimum percent of peak that the DF868
can use to measure transit time. The DF868 accepts values from -100
to +100.
[ENT]
14.Press to accept the current Maximum Percent of Peak value
or enter a new value and press
Use this prompt to enter the maximum percent of peak that the DF868
can use to measure transit time. The DF868 accepts values from -100
to +100.
[ENT]
15.Press to accept the current
[ENT]
new value and press
Normally, the Model DF868 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]
16.Press to accept the current
[ENT]
new value and press
Normally, the Model DF868 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.
The program returns to the initial
all programmed data in Appendix B, Data Records.
keys to select one of the preset values for
# of Errors
value or enter a new
[ENT]
.
.
[ENT]
.
T Window (cycles)
.
R Window (cycles)
.
SETUP
window. Remember to record
Programming Site Data
XMIT
value or enter a
value or enter a