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9
PAN
Th
e Pan function can be used to pan left, right, up, or down
on the chromatogram trace. Select Operation/Chart/Pan and
press Enter and the Pan tool will appear in the lower left
corner of the screen. Use the up arrow to Pan up the Chart;
use the down arrow to Pan down the Chart; use the left arrow
to Pan left on the Chart; or use the right arrow to Pan right on
the Chart. Once the desired chart view has been achieved,
press Accept to save the new chart view, or press Cancel to
return to the original chart view. The x-axis range is –60 to 0
minutes. The y-axis range is –500mV to 2.5V. To go directly
to Zoom from Pan, press Enter.
USER DEFINED SCALE
Th
e User Defined Scale screen can be used to enter user
defined x-axis and y-axis values for the chart scaling. Select
Operation/Chart/User Defined Scale and press Enter to reach
the User Defined Scale screen. Enter the minimum and
maximum x-axis and y-axis values in the window that
appears. The x-axis range is –60 to 0 minutes. The y-axis
range is –500mV to 2.5V. Once the new chart values have
been entered, press Accept to save the new chart settings or
press Cancel to return to the original settings.
ENABLE/DISABLE Y-AXIS AUTOSCALE
The Enable Y-Axis Autoscale function causes the chart to
automatically scale to the highest peak and ensures that the
chromatogram trace will always be on-scale. Select
Operation/Chart/Enable Y-Axis Autoscale and press Enter to
enable this feature. Select Operation/Chart/Disable Y-Axis
Autoscale and press Enter to disable this feature.
RESET SCALE
Th
e Reset Scale function will zoom out the chart view to its
maximum x-axis and y-axis values: -60 to 0 min; -500mV to
2.5V. Select Operation/Chart/Reset Scale and press Enter
to reset the chart axes.
3.2.5 AUTOZERO
The Autozero function can be used to zero the output on the
detector. To autozero, select Operation/Autozero and press
Enter using the up/down arrows on the keypad. The autozero
voltage will depend on the full-scale voltage setting on the
detector. For a 1V full-scale voltage setting, the default
Autozero value is 5mV. For a 10mV full-scale voltage setting,
the default Autozero value is 0mV. If the Custom Autozero
Output has been enabled, the detector will be autozeroed to
the value selected, from 0 to 100mV. Refer to Section 3.3.2
for more details on setting the Custom Autozero Output
value.
3.3 METHOD
Methods are created to set the temperature, gas flow, gain,
a
nd event settings on the detector.
3.3.1 NEW
Select Method/New and press Enter to bring up the New
Method window. Enter the Method Name, Temperature, Gas
Flow, Gain, and Timed Events using the keypad. Use the
up/down arrows to tab through the method parameters.
Method Name: The Method Name may include the following
characters: A - Z, a - z, 1 - 9, <space>, or . (period). Rapidly
press a button on the keypad to cycle between letter and
number options. For upper case, press Shift and then enter
the letter. The method name may contain up to 80 characters;
only 25 will be displayed in the main operation screen due to
space limitations.
Temperature: Enter a temperature value between 25
-120
o
C
u
sing the keypad.
Gas Flow: Enter a value between 0.0 – 4.0L/min using the
keypad.
Gain: Enter a value of 1, 2, 4, 8, or 16 using the keypad.
Each increase in gain setting will produce twofold signal
amplification over the previous setting.
Events: Events can be added to the method in order to
program timed gain changes or timed external output events.
Timed gain changes can be used so sample compounds of
widely varying concentration can be on-scale in the same
chromatogram. Timed external output events can be used to
trigger events on other instruments.
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