March 2008
1-22
Programming Site Data
Setting Transducer Signal
Limits (cont.)
An offset between the upstream and downstream transit times is
specified at this prompt. The default value for this parameter is 0
μ
sec
and values from –1000 to 1000
μ
sec are acceptable.
10.
Press
[ENT]
to accept the current
Skan T Offset
value or enter a new
value and press
[ENT]
.
At this prompt, specify a time measurement offset that compensates
for any shift resulting from cross-correlation. The default value for
this parameter is 58
μ
sec and values from –500 to 500
μ
sec are
acceptable.
Note:
If you enter a value of 0 for this command, you enable a
special mode of operation, ACTIVE SKAN T-OFFSET, that
dynamically calculates the offset.
11.
Press
[ENT]
to accept the current
% of Peak
value or enter a new
value and press
[ENT]
.
The percentage of peak used to calculate the transit times and Delta T
is specified at this prompt. The default value for this parameter is
50% and values from 1 to 100% are acceptable.
12.
Use the [
→]
and
[F1]-[F4]
keys to select one of the preset values for
the
XMIT Sample Size
from the option bar.
IMPORTANT:
Consult the factory before performing this step.
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
μ
sec and
values from 0 to 250
μ
sec are acceptable.
14.
Press
[ENT]
to accept the current
# shifts
value or enter a new value
and press
[ENT]
.
Summary of Contents for DigitalFlow GS868
Page 7: ...Chapter 1 ...
Page 59: ...Chapter 2 ...
Page 77: ...Chapter 3 ...
Page 90: ...Chapter 4 ...
Page 104: ...Chapter 5 ...
Page 110: ...Chapter 6 ...
Page 122: ...Appendix A ...
Page 131: ...Appendix B ...
Page 132: ...Data Records Option Cards Installed B 1 Initial Setup Data B 2 ...
Page 136: ...Appendix C ...
Page 156: ...Appendix D ...