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< PART – B Software >
B-90
IM 39J06B40-01EN 14th Edition: May 30, 2022
B7.3.3. Calibration
Calibration must be done to achieve accurate temperature measurement by setting
calibration parameters in the DTSX3000 beforehand.

Calibration
To perform temperature calibration, select [Use], and then specify the following
parameters.
- Calibration Type
Select the calibration type from Manual Input, Remote Input and Optical Switch.
For the [Manual Input] calibration type, DTSX3000 temperature measurement (DTS
Reading) offset is calibrated using the temperature reading of an external
thermometer (Thermometer Reading). If [Manual Input] is selected, specify the
temperature reading of an external thermometer, and the DTSX3000 measured
temperature.
- [Thermometer Reading]
Specify the temperature reading of an external thermometer as a value
from -273.15 [deg C] to 999.99 [deg C] in units of 0.01 [deg C].
- [DTS Reading]
Specify the DTSX3000 temperature measurement reading before calibration
as a value from -273.15 [deg C] to 999.99 [deg C].
For the [Remote Input] calibration type, DTSX3000 temperature measurement offset
is calibrated using actual thermometer temperature reading at a specified position. If
[Remote Input] is selected, specify the position for temperature calibration, and the
temperature averaging distance of the DTSX3000.
- Position
Specify the position for temperature calibration as a value from 0.0 [m] to
50000.0 [m] in units of 0.1 [m]
- Averaging Distance
Specify the distance in meters centered at the specified position to be used for
averaging in temperature calibration as a value from 1.0 [m] to 20.0 [m] in units
of 0.1 [m].
For the [Optical Switch] calibration type, DTSX3000 temperature measurement
offset is calibrated using settings stored in the optical switch memory.
Tip
- The Optical Switch option can only be selected as the Calibration Type for the first fiber section.
- If no optical switch is installed, temperature calibration is not performed.
- Wavenumber
Specify the wavenumber. This parameter determines the temperature scale factor.
Select [Default Or Other Section] or [Setting] as the wavenumber setting mode.
If [Default Or Other Section] is selected, the average of the wavenumber values
specified for other fiber sections is used as the wavenumber. If no fiber section is
specified with a wavenumber, the default wavenumber value is used.
If [Setting] is selected, a specified wavenumber is used. Specify the wavenumber
as a value from 0.01 cm -1 to 999.99 cm -1 in units of 0.01 cm -1.
The wavenumber can also be calculated using pre-calibration DTSX3000 measured
data and the temperature readings of a reference thermometer.