GE DigitalFlow GF868 - Page 34

Chapter 3. Diagnostics
24 DigitalFlow™ GF868 Service Manual (1 and 2-Channel)
3.2 Displaying Diagnostic Parameters (cont.)
Table 3 lists the available diagnostic parameters for the Model GF868. 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 signal strength for the upstream transducer. 50–75 <50 or >75
SS do DN Sig Strength Displays 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
Tot K K(Re) MultiK*KFactor Displays combination of all K factors. N.A. N.A.
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 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
the downstream transducer.
24 ± 5 <19 or >29
CNTup UP DAC Counts Displays AGC DAC count for upstream gain setting. N.A. N.A.
CNTdn DN DAC Counts Displays AGC DAC count for downstream gain setting N.A. N.A.
P#up UP +- Peak Displays signal peaks for the upstream transducer. 100 to
2300
<100 or
>2300
P#dn DN +- Peak Displays signal peaks for the downstream transducer. 100 to
2300
<100 or
>2300
TEMP Temperature F° Displays the gas temperature (4-20 mA input). N.A. N.A.
PRES Pressure psia Displays the gas pressure (4-20 mA input). N.A. N.A.
Mw Molecular Wt. Displays the average molecular weight of the gas. N.A. N.A.