Waters 2489, Operator'S Manual

Page: 76 / 234

3-8 Preparing the Detector
numbered 11 or 12, scroll to the desired item on the choice list, then press
Enter.
The table below explains the functions of the primary and secondary keys on
the detector keypad.
Detector keypad description
Key
Description
Unshifted Shifted
HOME – Displays the
absorbance screen containing
the icons, and the Wavelength
and AUFS fields. ? – Displays context-sensitive
help when available.
Chart Mark – Causes a
momentary pulse to the
analog output (A and/or B,
depending upon the current
settings). This key has no
effect if chart mark is disabled
on both channels. SCAN – Displays the list of
options for generating and
manipulating spectra.
Auto Zero – Sets the
absorbance offset so that the
analog output (A and/or B,
depending on the current
settings), reads 0 AU. You can
enable or disable the auto zero
function from the third
absorbance screen (see the
figure on
page 3-18 ).
λ/λλ
– When you are on the
absorbance screen, use this
key to toggle between single
and dual wavelength modes.
The current mode is indicated
by an icon on the display.
Run/Stop – Starts or stops
(freezes) the run clock. (The
elapsed time appears near the
lower-right corner of the
absorbance screen.) Initiates
scans. Reset – Resets the detector
run clock to 0 minutes.
Returns the detector to initial
conditions for the current
method.
?
HOME
SCAN
Chart Mark
λ/λλ
Auto Zero
Reset
Run/Stop