
95
Reference Manual
00809-0100-4811, Rev DA
Section 6: Service and Troubleshooting
January 2015
Service and Troubleshooting
6.2.2 Plotting the measurement signal
The Radar Configuration Tool (RCT) has powerful tools for advanced troubleshooting. By using
the Waveform Plot function, you get an instant view of the tank signal. Measurement problems
can be solved by studying the position and amplitude of the different pulses.
To plot the measurement signal:
1. Start the RCT program.
2. Select the View > Plotting menu option, or select the Plotting icon in the RCT
workspace (Tools page at the left side of the workspace) and select the Read
button.
Figure 6-2. Waveform Plot in RCT
In a typical measurement situation the following pulses appear in the diagram:
P1 - Reference pulse. This pulse is caused by the transition between transmitter head and probe.
It is used by the transmitter as a reference at level measurements.
P2 - Product surface. This pulse is caused by a reflection on the product surface. In
Measurement Mode = Interface when Immersed Probe however, P2 indicates the interface since
the surface of the upper product is ignored.
P3 - Interface or probe end. This pulse is caused by reflection on the interface between an upper
product and a bottom product with a relatively high dielectric constant. It may also be caused
by the probe end if there is no product above. This pulse is shown when the transmitter is in
Measurement Mode = Level & Interface.
Different amplitude thresholds are used in order to filter out unwanted signals. The following
amplitude thresholds are used for the Rosemount 3300 Series Transmitter:
T1 - amplitude threshold for detection of the reference pulse P1.
T2 - amplitude threshold for detection of the product level peak P2.
T3 - amplitude threshold for detection of the interface level peak P3.
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