Xylem photoLab 6600 UV-VIS - Manual (Page 27)

photoLab
®
6600 UV-VIS Operation
27 ba75848e01 08/2009
AutoCheck With the AutoCheck function the photometer checks and calibrates the
optical measuring unit. The AutoCheck is automatically carried out if
measurement settings were changed since the last measurement, e.g.:
z if a different wavelength was selected or
z if a different method was selected.
If necessary, the photometer asks you to remove the cell from the cell shaft.
With unchanged measurement settings, the AutoCheck is carried out in the
background at regular intervals of 5 minutes. The AutoCheck can only be
carried out in the background if the cell shaft is empty. If a cell is in the cell
shaft the AutoCheck is carried out only after the cell was removed.
Note
Remove the cell from the cell shaft after every measurement. Thus the
photometer can carry out the regular AutoCheck.
Cells must be completely removed from the cell shaft.
Cells that are removed only half disturb the AutoCheck measurement and, as
a consequence, falsify measured values until the next AutoCheck is carried
out.
Plastic cells that are not recognized by the automatic cell recognition also dis-
turb the AutoCheck.
Note
During a running kinetic measurement the photometer cannot carry out any
AutoCheck. That is why in this case a warm-up time of two hours is required.
After this time the signal is stable enough so that the measurement accuracy
is secured over a longer period of time.
Display illumination The photometer automatically switches off the display illumination if no key
has been pressed for 5 minutes. The illumination is switched on again with
the next keystroke. The function of the key becomes active only with the
following keystroke.
Switching off To switch the photometer off, keep the <ON/OFF> key depressed until the
photometer is switched off.