Panametrics DigitalFlow GC868, Руководство по программированию, Страница: 28 / 134

Chapter 1. Programming Site Data
1-17 DigitalFlow™ GC868 Programming Manual (2-Channel)
After completing these steps, the program returns to the SETUP window. Table 1-4 on
the next page lists the default values and limits for SETUP parameters.
1.6.5.2 Setting Response
Time
Use this option to specify the number of readings that occur before the meter will
respond to a step change in flow rate. In general, the smaller the number of
readings, the less steady the display will appear.
1. Press [F2] = AVRG to enter the AVERAGE submenu.
2. Use the [
→
] and [F1]-[F4] keys to select the desired option. The available
response time options are 1, 2, 5, 10, 30, 60 readings and STATS . For best results,
select STATS (statistics), as this increases the response time under steady flow
conditions while still allowing a rapid response to changes in flow rate.
After completing this step, the program returns to the SETUP window.
1.6.5.3 Initializing the
System
Use this option to initialize (reset) all of the parameters within the SETUP menu to
their default values.
1. Press [F3] = INIT.
2. Press [F1] = NO to keep the current values or press [F2] = YES to reset all values
to their default settings.
Table 1-4: Default Values and Limits for SETUP Parameters
Parameter
Default
Value Low Limit High Limit
Signal Low Limit 50 -20 100
Signal High Limit 68 25 100
Cor. Peak Limit 400 0 500
Soundspeed ±
Limit
10% 1% 50%
Velocity Low Limit
-75.0 ft/sec
(-23 m/sec)
-500 ft/sec
(-150 m/sec)
+500 ft/sec
(+150 m/sec)
Velocity High Limit
75.0 ft/sec
(23 m/sec)
-500 ft/sec
(-150 m/sec)
+500 ft/sec
(+150 m/sec)
Acceleration Limit
5.0 ft/sec
2
(4.6 m/sec
2
)
0
100 ft/sec
2
(30 m/sec
2
)
Amp. Discrim Low 14 0 100
Amp. Discrim High 34 0 100
Delta T Offset 0 -1,000 µsec 1,000 µsec
Skan T Offset 12.6 µsec -500 µsec 500 µsec
% of Peak 80% 1% 100%
XMIT Sample Size 8 2 32
M>S Switch 5 µsec 0 µsec 250 µsec
# shifts 3 0 10
A Divisor 2.5 0.1 10
# Transmit Pulses 1 1 16
T Window 1 0 1,000
R Window 10 10 128