I have been performing ASTM Drift and Noise Test on 1260 Infinity II DAD WR (G7115A) since yesterday, the results are the same - Noise failes at 254 nm (or so 0.03mah).
Module is new (less than 1 year).
In the last time I have performed Qualification, I also had the problem, I changed the lamp and test passed, but with many afforts (maybe once per 10 times). On this time, there were drift issues too.
In addition, I do tests without flow cell.
Could you please advise what should I do.