Chapter 3
Theory of Operation
Trimble S, VX, SPS & RTS Service Manual3 - 30 P/N 57150002, Revision 5.0
F
Pressure sensor
The instrument has an internal barometer. This sensor is capable of providing temperature and
atmospheric pressure readings. The sensor also contains a thermometer but it is not used.
The application software in the TCU uses the pressure information to calculate the PPM correction
for the EDM. Note: this correction is not made in the instrument and is available for the application
software.
The Pressure sensor is not available on the Trimble S3 and SPSx20 instruments.
Location of sensor
Fig. 3-30 Pressure sensor location
Function description
The sensor is connected to the PSM board which is responsible for controlling the sensor. Specific
parameters are included in the sensor such as correction values for the barometer.
Service
Maintenance
The Pressure sensor is calibrated from the supplier. A connection test is made after installation.
Replacement of spare parts
• Pressure sensor
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