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Hi Tony,
I had a quick read through the paper work that came with the device today. All I could find is that the exposure time may be manually set between 15 and 1000ms.
The setting I used I assume was automatic, but it seemed to update the graph around every second.
I don't think it is suitable for astro stuff except the sun. There is no way of cooling the detector (linear CCD I think) easily. The resolution stated at about 2.5nm? What ever it is it's fairly coarse.
We use it mostly to demonstrate coarse lines in "flame tests" (for ions), discharge tubes and fluro' tubes (mercury) and transmission through solutions.
I don't have any info on the optical fibre.
It works well for High School demo's of general spectroscopy.
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