Santec OTF-930 - Wavelength Offset (Calibration)

7-10
OTF-930 Operation Manual
7.8. Wavelength Offset (Calibration)
The OTF-930 is calibrated during manufacture and should not normally require re-calibration.
It is useful, however, to have the ability to apply an offset to the wavelength setting; for
example, to compensate for the difference between a wavelength in air or in vacuum, or to
match the
OTF-930 calibration to that of other instruments in the same system. A Wavelength
Offset function, which provides up to 1.0nm adjustment, is provided for this purpose. The
Wavelength Offset procedure is described below.
1.
Check that the unit is in standard operating mode and the lter position is set at a
known wavelength.
2.
Press the CAL Key. The Wavelength Display Panel changes to indicate the
currently set wavelength and the Optical Power Display Panel changes to show
‘CAL’.
3.
Enter the value of the new wavelength for this position of the lter using either
the
Numerical Keypad or the Up / Down Arrow keys. To cancel the input press the (-)
Key and the display will return to its currently set value.Do not press the enter
(ENT) key as this also has the effect of canceling the input.
4. Press the CAL key to save the entered value, set the Wavelength Offset and return to
normal operating mode. If a wavelength has been entered such that the Wavelength
Offset is greater than 1.0nm from the factory setting the CAL key will not have an
effect. In this case press the CL or BS keys to clear the input and re-enter the
wavelength, or press the Wavelength/ Power Selector Key to cancel the operation.
If
the CAL key is not
pressed within 10 seconds the unit will return to normal operation and the calibration
data will not be saved.
5. Note that if the CAL button is twice without entering a numeric value inbetween the
calibration data will be erased and the data will be returned to the factory calibrated
data.