APG DCU-1100 user manual - Manual (Page 13)

Rev. A2, 11/06 DCU-1104 and DCU-1108
13
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the Units (Mode 1) have been set. The blanking distance can also be used to
ignore unwanted targets close to the sensor such as welds, seams, pipe fittings,
or gaskets.
MODE DESCRIPTION PARAMETERS
4 Pulses Units = 42 Khz soundwaves
Range = 1-20
Default = 20
The Pulses mode controls how many pulsed soundwaves are transmitted in
each ultrasonic burst. The DCU-11 sends out a transmission burst of pulses and
measures the time it takes for the echo to return. Up to a certain point, the more
pulses that are sent in a burst, the stronger the returning echo. When detecting a
soft target in damping environments, increase the strength of the echo by
increasing the number of pulses. In acoustically active environments, small
enclosed areas, or hard surface areas, decrease the number of pulses in order to
decrease the energy transmitted and reduce multiple echoes.
Filtering
MODE DESCRIPTION PARAMETERS
5 Sample Rate Units = Seconds
Range = 0.120-1 (1- 8 in AutoSense mode)
Default = 1
The sample rate or time between ultrasonic bursts can be adjusted to achieve
the reaction time needed for the application. Typically, product levels change
slowly requiring a slow sample rate (1-8 seconds).
MODE DESCRIPTION PARAMETERS
6 Averaging Units = Samples
Range = 1-50
Default = 10
Averaging sets the number of samples that will be averaged in the first-in-
first-out (FIFO) average buffer. The DCU-11 will take readings at the rate
determined by Mode 5. Therefore, a setting of 10 in Mode 6 with a 1 second
sample rate, would result in a 10 second average updated once each second.