Panametrics DigitalFlow GM868, Service Manual

Page: 34 / 72

Chapter 3. Diagnostics
24 DigitalFlow™ GM868 Service Manual
3.2 Displaying Diagnostic Parameters (cont.)
Table 3 below lists the available diagnostic parameters for the Model GM868. 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
nsec
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 the 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.
P#up UP +- Peak Displays signal peaks for the upstream
transducer.
100-230
0
<100 or
>2300
P#dn DN +- Peak Displays signal peaks for the
downstream transducer.
100-230
0
<100 or
>2300