Difficulty Beyond 5.0 ABS

We're trying to get a reading from a Cary 5000 above a 5.0 absorption between 200-400nm. Specifically, we want to measure between 7 and 8 ABS, but we're getting erratic readings starting around 5.8-6.2 ABS, and cannot get any workable data once we are outside of visible ranges.

Any help, manuals or guides you can point me to would be greatly appreciated!

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