Operating Manual

Accu-Wave Chapter 5 Radar Fine Tuning
TN Technologies 5-27
“Dynamic Threshold Setup” Menu
[“Service Only Items” must be enabled]
Display Comments
Do not enable
dynamic threshold
Change to “Do”→→
Continue as is.↓↓
When set to default value of “Do not enable dynamic
threshold,” the menu items below are not displayed.
Change to “Do” to enable dynamic threshold. Reset to
“Do not” at any time to disable dynamic threshold.
Direct Entry Code: ‘026060’
Change
dynamic threshold
by .8000 each sec
NEXT↓↓
If there is no acceptable echo with an amplitude
greater than the present value of the dynamic
threshold, the dynamic threshold is decreased by the
factor entered here (value must be less than 1.0).
Direct Entry Code: ‘010003’
dynamic threshold
base= signal str/2^1
NEXT↓↓
The initial baseline value of the dynamic threshold is
set at the amplitude of the previously accepted echo
divided by 2
K
. Enter the value of the exponent K. For
example, if 3 is entered, the initial baseline value will
be 1/8 (1/2
3
) of the amplitude of the previously
accepted echo.
Direct Entry Code: ‘058004’
Dynamic threshold
increase smoothing
factor 1.000
{0.001 to 1.0} NEXT↓↓
Enter value for the “increase smoothing factor” (ISF).
Default value is 1.0 or no smoothing. If the new base
threshold value is greater than the old threshold, the
base value of the dynamic threshold will be equal to:
threshold
old
+ [ISF x (threshold
new
– threshold
old
)]
Direct Entry Code: ‘149013’
Dynamic threshold
decrease smoothing
factor 1.000
{0.001 to 1.0} NEXT↓↓
Enter value for the “decrease smoothing factor”
(DSF). Default value is 0.1. If the new base threshold
value is less than the old threshold, the base value of
the dynamic threshold will be equal to:
[threshold
old
+ [DSF x (threshold
new
– threshold
old
)]
Direct Entry Code: ‘149023’
Overall echo selection process
Note: The following example illustrates how the Radar Fine Tuning tools work in
combination with one another. It is not intended to reflect the setup of a
typical application.
Range of Interest (ROI) Setup:
• Primary Measurement: Level
• Distance REF LINE to zero level point: 25.00 ft