Hi all,
another reason to get low readings from the UV meter can be a drift
in the baseline. The photometer is properly calibrated only when
you turn it on, I think. Since we have our machine running in the
coldroom without (usually) turning it off for month, we have observed
wrong 260/280 ratios and weak signals at 280 nm. This was simply
cured by turning off and on.
Gottfried
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