Waters 2475, Operator'S Manual, Page: 98 / 228

3-26 Using the Detector
– High – Starts run when contact closure changes from off (open)
to on (closed).
– Low – (Default) starts run when contact closure changes from
on (closed) to off (open).
– Ignore – No response to inject-start input.
• Chart mark – You can specify a chart mark input to create a chart mark
on channel A and/or channel B. To determine the response of the
channel, enable the chart mark function (see the table titled “Primary
and secondary function (method) parameters” on page 3-21 and the
figure “Secondary functions of the home screen” on page 3-17) :
– High – Creates a chart mark(s) when contact closure changes
from off (open) to on (closed).
– Low – (Default) creates a chart mark(s) when contact closure
changes from on (closed) to off (open).
– Ignore – No response to chart-mark input.
• Auto Zero – You can configure the auto-zero input to auto zero
fluorescence readings on channel A and/or channel B. To determine the
response of the channel, enable the auto-zero function (see the table
titled “Primary and secondary function (method) parameters” on
page 3-21 and the figure “Secondary functions of the home screen” on
page 3-17 ):
– High – auto zeroes the channel when contact closure changes
from off (open) to on (closed).
– Low – (Default) auto zeroes the channel when contact closure
changes from on (closed) to off (open).
– Ignore – No response to auto-zero input.
• Lamp – You can configure the Lamp input level to turn the xenon lamp
on or off from an external device:
– High – Turns lamp on when contact closure is on (closed).
– Low – Turns lamp on when contact closure is off (open).
– Ignore – (Default) does not respond to Lamp input.
Setting pulse periods
In the third Configuration screen (see the figure “Configuration screens” on
page 3-25 ), you set the pulse width or activate a rectangular wave on SW1 or