Siemens SITRANS LR250 Operating Instructions Manual page 130

Parameter reference
TVT shaper (2.5.11.)
Note
• The range is –50 to 50 dB.
• Shaper Mode (2.5.10.4.) must be turned ON in order for TVT shaper points to be
transferred.
Adjusts the TVT (Time Varying Threshold) at a specified range (breakpoint on the TVT). This
allows you to reshape the TVT to avoid unwanted echoes. There are 40 breakpoints arranged in
5 groups. (We recommend using SIMATIC PDM to access this feature.)
To use TVT shaper via SIMATIC PDM:
1. Go to Level Meter > Setup > Signal Processing > TVT setup > Shaper Mode and select On.
2. Open the menu Device – Echo Profile Utilities and click on TVT Shaper. For more detail see
TVT Shaper via SIMATIC PDM (Page 86).
To use TVT shaper via LUI (local user interface):
1. Go to Shaper Mode (2.5.10.4.) and select ON.
2. In TVT shaper, go to Breakpoints 1-9 (2.5.11.1.).
3. Open Breakpoint 1 and enter the TVT Offset value (between –50 and 50 dB).
4. Go to the next Breakpoint and repeat step 3 until all desired breakpoint values have been
entered.
Breakpoint 1-9 (2.5.11.1.)
Values
Breakpoint 10-18 (2.5.11.2.)
Values
Breakpoint 19-27 (2.5.11.3.)
Values
128
Range: –50 to 50 dB
Default: 0 dB
Range: –50 to 50 dB
Default: 0 dB
Range: –50 to 50 dB
Default: 0 dB
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 08/2014, A5E32221386-AC