GE DigitalFlo XGM868i - Page 27

DigitalFlow™ XGM868i Service Manual 19
Chapter 3. Diagnostics
3.2 Displaying Diagnostic Parameters (cont.)
Table 3: Available Diagnostic Parameters
Option Bar Description Good Bad
SS up Displays the signal strength for the upstream transducer. 50–75 <50 or >75
SS do Displays the signal strength for the downstream transducer. 50–75 <50 or >75
SNDSP Displays the measured speed of sound in the gas. N.A. N.A.
Tup Displays the upstream ultrasonic signal transit time. N.A. N.A.
Tdown Displays the downstream ultrasonic signal transit time. N.A. N.A.
DELTA
Displays the transit time difference between the upstream and
downstream signals.
N.A. N.A.
Tot K Displays the total number of K factors. N.A. N.A.
PEAK% Displays the percentage of peak (set to +50 by default). N.A. N.A.
Qup Displays the signal quality for the upstream transducer. >1200 –400 to +400
Qdown Displays the signal quality for the downstream transducer. >1200 –400 to +400
AMPup
Displays the value for the signal amplitude of the upstream
transducer.
24 ± 5 <19 or >29
AMPdn
Displays the value for the signal amplitude of the downstream
transducer.
24 ± 5 <19 or >29
CNTup Displays the AGC DAC count for the upstream gain setting. N.A. N.A.
CNTdn Displays the AGC DAC count for the downstream gain setting. N.A. N.A.
P#up Displays signal peaks for the upstream transducer. 100-2300 <100 or >2300
P#dn Displays signal peaks for the downstream transducer. 100-2300 <100 or >2300
TEMP Displays the gas temperature (from 0/4-20 mA input). N.A. N.A.
PRESR Displays the gas pressure (from 0/4-20 mA input). N.A. N.A.
AcVOL Displays actual volumetric flow. N.A. N.A.
StVOL Displays standard volumetric flow. N.A. N.A.
Tu S
1
Displays Skan transit time upstream. N.A. N.A.
Td S
1
Displays Skan transit time downstream. N.A. N.A.
DT S
1
Displays Skan Delta T. N.A. N.A.
Tu M
1
Displays Measure transit time upstream. N.A. N.A.
Td M
1
Displays Measure transit time downstream. N.A. N.A.
DT M
1
Displays Measure Delta T. N.A. N.A.
Vinst Displays the instantaneous velocity. N.A. N.A.
1
available only if Burst Mode = S/M