User's Manual

PL-611 IQ Radar 300 Page 77
Parameters
Parameters Parameters
Parameters
breakpoints, the effective bias to the shaper can be broadened to suit the desired
correction. In the case of multiple false echoes, shaping can be applied along different
points of the curve. Shaping should be applied sparingly in order to avoid missing the
true echo.
To change a breakpoint:
1. Confirm that P831, TVT shaper, is ON.
2. Go to P832
3. Press
twice to highlight the index value
4. Press
or to scroll through the 40 points (or type in the desired point)
5. Enter the value from –50 to 50
6. Press
P833 TVT Start Min
Use this feature to adjust the TVT Curve height to ignore false echoes (or pick up true
echoes) near the start of the Echo Profile.
Range: 30 to 225
Values
Pre-set: 50
Related Parameters
• P834 TVT Start Duration
Enter the minimum TVT Curve start point (in dB above 1 uV RMS).
This feature should only be used if increased Near Blanking (P800) would extend farther
than desired into the measurement range.
P834 TVT Start Duration
Use this feature in conjunction with TVT Start Min (P833) to ignore false echoes (or pick
up true echoes) near the start of the Echo Profile.
Range: 0 to 9999
Values
Pre-set: 30
Related Parameters
• P833 TVT Start Min
• P835 TVT Slope Min 77
Enter the time (in ms) for the TVT Curve to decrease from the TVT Start Min (P833) point
to the TVT Curve baseline.
P835 TVT Slope Min
Enter the minimum slope (in dB/s) for the middle of the TVT Curve.
Range: 0 to 9999
Values
Pre-set: 200
Related
• P834 TVT Start Duration