GE DigitalFlow GS868, Service Manual

Page: 36 / 74

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