DAD Self Test failed due to failed Spectral Flatness

Hi,

When self test on DAD G7117C with 10mm MaxLight Flowcell is performed, it fails because of the spectral flatness (measured 3.3587 AU and limit is 0.002 AU).

Whats exactly calculated in spectral flatness?
What could be a reason that this test fails?

PM on system was performed a few days ag, lamp is about 1033h on-time.. it was on for 0.68h before test was started..

Kind regards,

Chantale

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