GE DigitalFlow GS868 Service Manual page 36

Chapter 3. Diagnostics
3.2 Displaying Diagnostic Parameters (cont.)
[F1]
For example, pressing
Ch1 label
Ch1 DN Transit usec
519.7
(error codes appear here)
Tdown DELTA PEAK %
Table 3 below lists the available diagnostic parameters for the Model GS868. The first column in the table shows the
parameter as it appears on the option bar, while the second column shows the parameter as it appears in the prompt area
after it has been selected.
Option Bar Screen Display
SS up UP Sig Strength
SS do DN Sig Strength
SNDSP Soundspeed Ft/s
Tup UP Transit S usec
Tdown DN Transit usec
DELTA DeltaT usec
PEAK% PEAK%
Qup UP Signal Q
Qdown DN Signal Q
AMPup UP Amp Discrim
AMPdn DN Amp Discrim
CNTup UP DAC Counts
CNTdn DN DAC Counts
26
Tdown
displays the parameter, as shown in the following prompt.
Press the 
gSITE
diagnostic parameter or to
Qup
Table 3: Available Diagnostic Parameters
Displays the signal strength for the upstream
transducer.
Displays the signal strength for the downstream
transducer.
Displays the measured sound speed of the fluid.
Displays the upstream transit time of the ultrasonic
signal in microseconds.
Displays the downstream transit time of the ultrasonic
signal in microseconds.
Displays the difference in µsec between upstream and
downstream transit times.
Displays the percentage of peak (set to +50 by
default).
Displays the signal quality for the upstream
transducer.
Displays the signal quality for the
downstream transducer.
Displays the value for the amplitude
discriminator of upstream transducer.
Displays the value for the amplitude
discriminator of downstream transducer.
Displays the AGC DAC count for upstream gain
setting.
Displays the AGC DAC count for
downstream gain setting.
and  keys and the appropriate
]
EXIT
the Diagnostics Menu.
Description
[Fx]
key to display a different
Good Bad
50–75 <50 or >75
50–75 <50 or >75
N.A. N.A.
N.A. N.A.
N.A. N.A.
N.A. >10,000 µsec
N.A. N.A.
 1200
–400 to +400
 1200
–400 to +400
24 ± 5 <19 or >29
24 ± 5 <19 or >29
N.A. N.A.
N.A. N.A.
DigitalFlow™ GS868 Service Manual