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INF-TN1FSH-E
6.3.3. Checking demodulated waves (Pulse Doppler)
Monitor the waveforms and check the state of demodulated waves.
Window and demodulated wave
CH1
(ADN)
CH2
(RWIN)
Doppler signal
Demodulated wave
CH1: 500mV/div
CH2: 5V/div
TRIG: CH3 or EXT TRIG
+EDGE
500 mV
to
4 V
Window
Amplitude by
Point
1. The amplitude of demodulated wave (amplitude due to Doppler signals) within the HIGH zone (window) of RWN
of CH2 is kept within 3.2 Vpp.
(1) When amplitude is small: Echo sensitivity is low. See the following figure.
(2) When amplitude is larger than 3.2 Vpp: The flow transmitter may be defective. Inform us of the details of the
error.
When there are no Doppler signals
CH1
(ADN)
CH2
(RWIN)
Demodulated wave
No doppler signals
If there are no reflectors such as air bubbles and particles within the measured fluid, sufficient amount of Doppler
signals cannot be obtained, resulting in measurement error.
6.3.4. Measures against hardware failure
If hardware failure is detected by performing maintenance and inspection and troubleshooting in Chapters 5 and 6,
inform us of the details of the failure and the messages in RAS information.
