Chapter 1. Programming Site Data
26 DigitalFlow™ GF868 Programming Manual (1-Channel)
1.10.1 Setting Transducer Signal Limits (cont.)
1.10.2 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. To enter the AVRG submenu, press [F2] at the SETUP window.
2. Use the [ and [F1]-[F4] keys to select the desired option. The available response time options are 1, 2, 5, 10, 30, 60
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.
The GF868 program returns to the SETUP window. Remember to record all programmed data in Appendix B, Data
Records.
Table 2: Default Values and Limits for SETUP Parameters
Parameter Default Value Low Limit High Limit
Signal Low Limit 20 -20 100
Cor. Peak Limit 100 0 500
Velocity Low Limit -300.0 ft/sec (- 85 m/sec) -500 ft/sec (-150 m/sec) +500 ft/sec (+150 m/sec)
Velocity High Limit 300.0 ft/sec (85 m/sec) -500 ft/sec (-150 m/sec) +500 ft/sec (+150 m/sec)
Acceleration Limit
100 ft/sec
2
(30.48 m/sec
2
)
0
250 ft/sec
2
(76 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 58 μsec -500 μsec 500 μsec
% of Peak 50% 1% 100%
XMIT Sample Size 8 2 32
M>S Switch 50 μsec 0 μsec 250 μsec
# shifts 3 0 10
A Divisor 2.5 0.1 10
# Transmit Pulses 4 1 16
T Window 0 0 1,000
R Window 10 10 300
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