5
Units of Measurement/Beeper
The Model 2000 can output velocity in ft/s or m/s. When the beeper symbol is shown, the beeper is
active. Press down on the ON/C and OFF keys simultaneously to cycle between:
• FT/S no beeper
• M/S no beeper
• F/S with beeper
• M/S with beeper
Fixed Point Average/Time Constant Filtering
The fluid dynamics around the sensor electrodes may cause the readings to bounce around. To stabi-
lize the readings, the output to the display is dampened. The display can be dampened by Fixed Point
Averaging (FPA) or by time constant filtering (rC).
Fixed Point Averaging is an average of velocities over a fixed period of time. Time constant filtering is
a software algorithm that mimics an RC analog circuit. Press the 5 and 6 keys simultaneously to
alternate between the FPA and rC displays.
FPA
The display will show the letters FPA when you first switch to the FPA display. Except for the first
period, the display is updated at the end of each averaging period. For example, if the FPA is set to 10
seconds, the display is updated once every ten seconds. The FPA display will have a horizontal time
bar under the velocity output. The time bar provides an indication as to the amount of time left until the
display is updated.
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