Xylem photoLab 6100 VIS - Manual (Page 71)

photoLab
®
6100 VIS Operation
71 ba75847e01 08/2009
4.6.3 Measuring against the Reference absorbance
Each time the photometer is switched on, the absorbance or transmission is
measured against the absorbance of the zero adjustment as a basis. You
can, however, also determine a Reference absorbance and use it as the
basis.
The Reference absorbance refers to the adjusted wavelength. The measured
value remains stored until
z the photometer is switched off
z the cell type is changed
z the wavelength is changed
z a new reference value is measured
z it is deleted manually ([Reference] / Delete).
z the Absorbance / % Transmission measuring mode is exited
Single and multiple
determination
The Reference absorbance can be determined with single or multiple
determination. With multiple determination, the mean value is calculated as
the median from the individual measured values.
Measuring the
Reference
absorbance
The settings of the last
measurement are active.
1 Start the reference measurement
with [Reference].
If a value for the reference
absorbance is already stored, it
can be deleted or overwritten by a
new reference measurement.
After the reference absorbance
value has been deleted, the
photometer measures against the
absorbance of the zero
adjustment.
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Absorbance / % Transmission
Absorbance 04/16/07 9:52
To start measurement,
insert cell or press <Start/Enter>
489 nm 10 mm
Setup Wavelength Transmission Reference