User's Manual

Page 76 SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS 7ML19985LT01
mmmmm
Parameters
2.4.9. TVT shaper
Adjusts the TVT (Time Varying Threshold) at a specified range (breakpoint on
the TVT). This allows you to reshape the TVT curve to avoid unwanted echoes.
There are 120 breakpoints.
To use TVT shaper via SIMATIC PDM:
Open the menu Device – Echo Profile Utilities and click on the tab TVT Shaper
(see
TVT Shaper on page 47 for more details).
To use TVT shaper via the local display interface (LDI):
a) Go to Shaper Mode (2.4.8.4.) and select option ON.
b) In TVT shaper, go to Breakpoint 1-9 (2.4.9.1.).
c) Open Breakpoint 1 and enter the TVT Offset value (between –50 and 50).
d) Go to the next Breakpoint and repeat step (c) till all desired breakpoint
values have been entered.
2.4.9.1. Breakpoint 1-9
2.4.9.2. Breakpoint 10-18
2.4.9.3. Breakpoint 19-27
2.4.9.4. Breakpoint 28-36
2.4.9.5. Breakpoint 37-45
2.4.9.6. Breakpoint 46-54
2.4.9.7. Breakpoint 55-63
2.4.9.8. Breakpoint 64-72
2.4.9.9. Breakpoint 73-81
2.4.9.10. Breakpoint 82-90
2.4.9.11. Breakpoint 91-99
2.4.9.12. Breakpoint 100-108
2.4.9.13. Breakpoint 109-117
2.4.9.14. Breakpoint 118-120
Notes:
• Shaper Mode (2.4.8.4.) must be turned ON in order for TVT shaper
breakpoints to be transferred.
• We recommend using SIMATIC PDM to access this feature.
Values
Range: –50 dB to +50 dB
Default: 0