Waters 2489, Operator'S Manual

Page: 91 / 234

Using the operator interface 3-23
or a MassLynx system, you must select a data sampling rate of 1 point per
second.
Configuring event inputs (contact closures)
You also use the CONFIGURE key to edit event input settings and specify
switched output settings.
Using the Enter key and the numeric keypad (or the
▲
and
▼
keys) to select
the appropriate entry, you can edit four fields on the second Configuration
screen shown above:
Tip:
The default for Inject, Chart Mark, and Auto Zero is Low; the default for
Lamp is Ignore.
• Inject – You can specify the Inject input to signal the start of a run. This
event resets the run-time clock and applies initial method conditions
immediately:
– High – Start run when contact closure changes from off (open) to on
(closed).
– Low – Start run when contact closure changes from on (closed) to off
(open).
– Ignore – Do not respond to Inject start input.
• Chart mark – You can specify the chart mark input to create a chart
mark on channel A and/or channel B. You determine the response of the
channel using the enable chart mark function explained in the table on
page 3-19 and shown in the figure on page 3-18 .
– High – Create chart mark(s) when contact closure changes from off
(open) to on (closed).
– Low – Create chart mark(s) when contact closure changes from on
(closed) to off (open).
– Ignore – Do not respond to chart mark input.
• Auto zero – You can configure the auto zero input to auto zero
absorbance readings on channel A and/or channel B. You determine the
response of the channel using the enable auto zero function explained in
the table on page
page 3-19 and shown in the figure on page 3-18 .
– High – Auto zero the channel when contact closure changes from off
(open) to on (closed).