Troubleshooting
10.3 Test Facilities Graph Screen
FUS1010 IP65 NEMA 4X & IP66 NEMA 7
170 Operating Instructions, 01/2013, A5E02951520-AC
Signal Masking Function: (Hot Key 7)
Under conditions of extremely low signal amplitude, a noise spike associated with the flow
meter receive signal window may be present on the extreme left side of the graph display. If
this spike is large enough it may interfere with the signal detection routines.
1. To eliminate this noise from the signal processing routines, press the <7> key to invoke
the [Mask Set #] command, then press the <+> key until the noise is no longer present in
the receive waveform.
2. Press <0> to exit this command.
Hold Set Function: (Hot Key 8)
The [Hold Set #] command is used to set the Hold Set number higher if intermittent mis-
registration occurs. Press the <8> key on the keypad to invoke this function.
Table 10- 2 Description of Graph Screen Text Display Parameters
Screen Text Parameters Menu List Item Description
F Flow Measured flow rate in selected flow
units.
VS Vs m/s Sound Velocity in meters per second.
[ ] Display Metrics Represents the digital sample position
of the receive window.
Correlated plot Displays the receive waveform in its
proper superposition or registration.
The true delta time will be displayed by
NOT selecting "Correlated Plot".
Centroid Mark Indicates with a large vertical marker
the peak energy of the receive
waveform.
D Damping Displays the minimum and maximum
digital damping exponent along with the
active damping exponent.
Tn Tn (usec) Receive signal transit time in
microseconds.
dT DeltaT (nsecs) Transit time delta (difference) in
nanoseconds.
S Signal Strength Displays %Valc (amplitude), %Vaer
(aeration factor) and numeric ALC.
Signal-to-Noise Ratio Indicates the signal to noise ratio of the
receive signal. Increased damping will
increase the S/N ratio as the
asynchronous noise reduces.
SN
Envelope Percentage change of the signal from
Initial Makeup conditions.
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