Ophir Optronics Ltd QSR Manuel D’Utilisation
Chapter 5 – Measuring with the Photodiode Head
Adjusting Calibration Factors
Zeroing the Instrument
To zero the instrument for a photodiode head, refer to Zeroing the Instrument in
Chapter 4 – Measuring with the Thermopile Head.
Chapter 4 – Measuring with the Thermopile Head.
Note: When zeroing the instrument for photodiode heads, it is unnecessary to
disconnect the head. Turn the laser off instead, and cover the head.
Setting Line Frequency
To set the line frequency for a photodiode head, refer to Setting Line Frequency
in Chapter 4 – Measuring with the Thermopile Head.
in Chapter 4 – Measuring with the Thermopile Head.
Adjusting Calibration Factors
Warning: Adjusting the calibration factor makes a permanent change in the head.
It is strongly recommended that before making any change to the factor,
the original factory setting is recorded separately. This will make it
easier to restore the value to its original setting later if needed
the original factory setting is recorded separately. This will make it
easier to restore the value to its original setting later if needed
Photodiode detectors are inherently very linear but do vary broadly in sensitivity
from wavelength to wavelength. In addition, Ophir PD300 models are equipped
with both a built in and a removable filter to enable measurement of higher
powers without detector saturation. The transmission of these filters depends on
wavelength. The PD300 has a built in calibration adjustment for wavelength. For
more information on the PD300 built in calibration adjustment, refer to
Appendix B – Calibration, Traceability, and Recalibration. The user cannot
recalibrate the whole calibration curve, but can adjust the overall calibration,
which in turn adjusts all wavelengths proportionately.
from wavelength to wavelength. In addition, Ophir PD300 models are equipped
with both a built in and a removable filter to enable measurement of higher
powers without detector saturation. The transmission of these filters depends on
wavelength. The PD300 has a built in calibration adjustment for wavelength. For
more information on the PD300 built in calibration adjustment, refer to
Appendix B – Calibration, Traceability, and Recalibration. The user cannot
recalibrate the whole calibration curve, but can adjust the overall calibration,
which in turn adjusts all wavelengths proportionately.
To adjust the power calibration factor:
1. Click the right mouse button and select Calibrate from the pop-up menu.
OR
Open the Functions menu and select Calibrate. The Adjust Calibration
Factor dialog box appears.
Factor dialog box appears.
StarLab User Guide
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