APG DCR-1004 user manual - Manual (Page 18)

DCR-1003 and DCR-1004 Rev. A3, 10/08
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MODE DESCRIPTION
7 Set the sample rate delay as high as is practical in your application to allow
more time for the previous sound wave to dissipate before transmitting the
next wave. This will minimize the chances of multiple-echo interference.
8 Set the samples averaged as high as is practical in your application to help
minimize the effects of waves and ripples on a liquid target. A greater number
of target readings averaged together will result in a more stable displayed
output of a wavy surface.
9 Set the out-of-range samples as high as is practical in your application to
filter out unwanted intermittent objects and still assure the intended target is
being tracked smoothly.
10 Set the window as small as is practical in your application to help isolate the
intended target (rarely needs to be set to less than 0.33 ft.). A smooth slower
moving surface will allow for a small window setting, while a wavy and fast
moving surface will require a larger window setting.
Filtering Guideline 2 - Ignoring Intermittent Obstacles
To prevent splashing, agitators, or other intermittent objects from being
detected even though they are occasionally in the ultrasonic detection beam
MODE DESCRIPTION
7 & 9 Modes 7 and 9 should be increased. If the sample rate delay (Mode 7) is set to
0.250 seconds, and the out-of-range samples (mode 9) is set to 10, then the
DCR will require only 10*0.250 or 2.5 consecutive second of readings
outside the window (mode 10) before the new target will be recognized. If the
numbers are increased to 0.500 seconds and 40 out-of-range samples, then the
DCR will require a much greater time of 0.500*40 or 20 consecutive second
of readings outside the window before the new target will be recognized.
10 Should be kept to a small value to help qualify only echoes from the target
surface.