English to French Science Physics Photometers

An image displaying a blank tube will be displayed
on screen. When this is replaced by 0.00 the
instrument is finished blanking and ready to take a
reading.
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Error messages are coded 7, 8 and 9 and all relate to
blanking the instrument. In the first instance, the user
should check the operating technique and sample clarity.
If these are in order, then these errors indicate a fault in
the optics :-

Merci d'avance!