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IM 1F5B2-01E
8. MAINTENANCE
8.4.3 Instructions on Use of Check Terminals of Amplifier Unit
Test all the check items hereinafter discussed in this subsection at the test points
between terminals P and COM and between terminals TP2 and COM.
CAUTION
Do not ground any test-purpose measuring instruments.
COM terminal
P termina
TP2 terminal
HHT terminal
Figure 8.4-1 Check Terminals of Amplifier Unit
(1) TP2 Terminal
Used for trigger level adjustment. See Subsection 8.2.3.
Using an oscilloscope, observe the voltage waveform appearing across terminals TP2
and COM. Make sure the ultrasonic emitter/detector of the sensor assembly and
related circuits are operating normally.
a.A waveform with the vortex frequency shown in Figure 8.4-2 should be observed at
this test point. The waveform should be neither at the power supply frequency nor
at a frequency at which the pipeline vibrates.
b.If piping conditions are inferior, the waveform should look like the one in Figure
8.4-3.
Figure 8.4-2 Normal Waveform at Terminal TP2
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