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April 2009
Displaying Diagnostic Parameters
As part of its measurement menu, the PT878GC offers a list of
diagnostic parameters to aid in troubleshooting in the event of
flowcell, transducer, or electrical problems. You can select any
diagnostic parameter for display as a measurement as discussed
in Chapter 6 on pages 6-7 and 6-8. Table 10-2 below shows all the
available diagnostic parameters and ranges.
Table 10-2: Diagnostic Parameters
Diagnostic
Parameter
ΔT
Amplitude Up
Amplitude
Down
T Up
T Down
Gain/Up
Gain/Dn
CNTup
CNTdn
10-6
Displays
Displays Delta T, or the differ-
ence between the upstream
and downstream transit times.
Displays the value for the
amplitude discriminator of the
upstream transducer.
Displays the value for the
amplitude discriminator of the
downstream transducer.
Displays the upstream
transit time of the
ultrasonic signal in micro
seconds.
Displays the downstream tran-
sit time of the ultrasonic signal
in micro seconds.
Displays upstream gain in dB.
Displays downstream gain in
dB.
Displays the AGC DAC count
for upstream gain setting.
Displays the AGC DAC count
for downstream gain setting.
Good
N/A
20-28
20-28
fluctua-
tions
N/A
N/A
N/A
N/A
N.A.
N.A.
Diagnostics and Troubleshooting
Bad
Continuous
large fluctu-
ations of 1
micro sec-
ond or
more.
<20 or > 28.
< 20 or > 28
fluctuations
N/A
N/A
N/A
N/A
N.A.
N.A.
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