What´s the issue? Just set the wavelength on your CDS and a suitable reference, if needed. If you share more details about the model#, I can point you to the user manual.
Here´s an old, but useful document about DAD optimization:
For the reference wavelength, there´s a guideline on page 12 of the DAD optimization document. There is no need to use a reference, but often it´s beneficial. Make sure the reference WL is well separated from the signal WL, as shown in the document. There are many pages on the topic "reference".
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