Dwyer UXF3 - Manual (Page 128)

-120-
6.6.6.2. Checking sending/receiving
Monitor the waveform, and check the status of received waveform.
a) Normal status
Transmitted/received waveform for
both forward and reverse directions
CH1 : 500mV/div
CH2 : 5V/div
Point
1. Check that overall noise level is kept at 0.3
Vp-p or lower.
Relationship between the received
waveform and the sampling window
CH1 (SMP)
CH2 (SIG)
Magnified
Noise level
Pipe inside echoic wave (generated only
in case of V method mounting).
In mounting by the Z method, there is no
echoic wave.
㩷
Forward direction:
Sends from the upstream of the
detector, and receives at the
downstream.
Reverse direction:
Reverse procedure of forward direction.
Sampling window
CH2 (WID)
CH1 (SIG)
CH1 : 500mV/div
CH2 : 5V/div
Point
1. There is the received waveform
for SMP of
CH1 in front of the center of LOW.
2. The received waveform is approximately
0.75Vo-p.
Magnified view of signals
CH1 : 500mV/div
Point
1. Startup is kept within 3 to 6 waves.
2. The peak (amplitude) does not fluctuate.
If the peak fluctuates vertically, air may be
mixed in.
3. The time base must not fluctuate.
If it does, there may be influence by turbulent
flow or drift current.
The received waveform controls the peak to be approximately 1.5Vp-p.
Peak fluctuation
Time base fluctuation
Forward direction Forward direction Reverse direction
Received waveform Transmitted waveform
Bulletin F-107-UXF3