Rosemount Tank Radar AB LOOPRADAR 用户手册

5-11

Edition 1.

Ref. No: 307010E

Using the Display Panel

5.7 Disturbance Echo Handling

If the transmitter has locked to a disturbing echo you can create a Noise Threshold
Table in order to suppress the disturbing echo:
1.

Do the following to check where the disturbing echo is located and the corre-
sponding radar signal amplitude:

1. Choose sub menu [1-1] and set the Output Parameter to Ullage.
2. Note the Ullage value.
3. Choose sub menu [1-1] and set the Output Parameter to Amplitude.
4. Note the Amplitude value.
5. Choose sub menu [1-1] and set the Output Parameter to the desired

value (see the Key Parameter list).

Now you can start creating the noise table.

2.

Choose sub menu [6-1].

3.

Specify the number of points you want to use for the Noise Threshold Table.
In order to suppress a single peak signal four points is sufficient. For more
complicated noise tables you can use up to ten points.

4.

Choose sub menu [6-2] and enter the ullage values that correspond to the
desired noise table break points. The points must be added in consecutive
order. Use a margin of ± 0.3 meter, see illustration below.

5.

Choose sub menu [6-3] and enter the amplitude threshold values that corre-
spond to the desired noise table break points. A margin of + 5 dB is suffi-
cient in most cases.

+ 5 dB

Signal Amplitude

Ullage

Point 1

Point 2

Point 3

Point 4

6.

Return to measuring mode and check that the transmitter detects the product
surface.