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Spectra Graph Cursor Use
Table 7- 11
High Limit Cursor
Low Limit Cursor
Noise Level Set Cursor
Using Spectra Graph Data and Controls
When the Spectra Graph is first displayed:
● The data shown on the top highlighted line shows Velocity in feet-per-second (F/S) on the
left side.
● The volumetric Flow Rate in the current rate units is displayed on the right side.
You can scroll the data shown by pressing the <Up and Down> Arrows.
1. Pressing the <Up Arrow> changes the data in the highlight to [Diagnostic Data]
containing, from left to right: (Hz) Doppler shift frequency in Hertz, (mV) Signal Amplitude
in millivolts, (FFT Pk) Peak FFT magnitude and (%D) FFT Percent Deviation. Carefully
inspect the data for Signal Amplitude and Percent Deviation. Refer to the "Available
Adjustments to Spectra Graph" table and the "Reflexor Diagnostic Data" table in this
section for details. Press the <Down Arrow> to return to [Velocity].
2. Press the <Down Arrow> from Flow Velocity in feet per second (F/S) to advance to the
Noise Level Set cursor control. A numeric indication of the Noise Level Cursor position is
provided in the highlighted area. Refer to the "Available Adjustments To Spectra Graph"
table for details.
FUE1010 IP65 NEMA 4X
Operating Instructions, 12/2014, A5E03086491-AC
Cursor Definitions
Cursor
Definitions
This cursor appears as a vertical line on the right
side of the Spectra Graph. All signals to the right
of this line will be excluded from the flow calcula-
tion. Use this adjustment if the right side of the
Spectra Graph has noise that is larger in ampli-
tude than the signal that is produced by flow. The
cursor may be arbitrarily placed at two times the
maximum flow expected.
This cursor appears as a vertical line on the left
side of the Spectra Graph. All signals to the left of
this line will be excluded from the flow calculation.
Use this adjustment if the left side of the Spectra
Graph has noise that is larger in amplitude than
the signal that is produced by flow. The cursor
may be arbitrarily placed at one half the minimum
flow expected.
This cursor appears as a horizontal line on the
Spectra Graph. All signals below this line will be
excluded from the flow calculation. Position the
cursor approximately one quarter the height of
the FFT peak.
Functions
7.12 Reflexor
137
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