5-1
IM AQ6380-02EN
Maintenance
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App
Index
5.1 Inspection of Wavelength Accuracy
Perform a check of the instrument’s wavelength accuracy.
Use a light source such as a gas laser whose wavelength accuracy is known.
Light so urce
SM optical fiber (9.5/125 μm)
AQ6380
Procedure
1.
Connect a light source to the instrument as shown in the figure above, then measure
spectrums of the light source.
Confirm that the THRESH 3 dB center wavelength of the measured spectrum matches the
wavelength of the light source (is within the wavelength accuracy standard).
For more information, see section 6.2, “Spectrum Width Measurement,” in IM AQ6380-01EN.
2.
If the wavelength error is large, use the internal reference light source to calibrate
wavelengths.
For the calibration procedure, see section 3.5.
3.
For performing wavelength calibration, check wavelength accuracy again according to
procedure.
Note
If the wavelength error of the instrument is outside of [+/-] 5 nm, you cannot perform wavelength calibration
with the internal reference light source. In this case, readjustment is necessary. Please contact your nearest
Yokogawa representative.
Chapter 5 Maintenance
