Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 91)

<6. Analysis Results Windows>
6-16
IM 11B03G03-03E
n Creating Graphs in a History Record Window
l Procedure
(1) While one of the four history record windows is open, click on the [Draw A], [Draw B], or
[Draw C] command in the [Graph] menu or any of the buttons on the toolbar. The
Graph Setup dialog box pops up.
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(2) Select the peak names to be shown on a graph from the list box at the bottom right, as
described below.
Selecting consecutive peak names: Drag the mouse from the first peak name to the last
one.
Selecting nonconsecutive peak names:
(a) Click on the first peak name or the range of peaks.
(b) Click on the second peak name or the range of peaks while holding down the [CTRL]
key.
(c) Repeat step (b) to select all the necessary peak names.
The selected peak names will be highlighted.
• You can select a maximum of six peak names at one time.
• If you have selected the wrong range of peaks, make selection again.
(3) Set up the vertical axis scale (the concentration scale for the Concentration Analysis History
window and the retention time scale for the Retention Time History window).
(a) Select either Linear or Logarithmic scale.
(b) Select either Auto or Manual for the scale setting. In automatic scaling, the system
automatically sets the scale appropriate for the selected range of peaks. In manual
setting, the minimum and maximum values of the axis should be entered here.
• Zero and negative numbers cannot be indicated correctly in a logarithm scale. Always
select the linear scale if data values include zero or negative numbers.
(4) Set the range of the time axis.
(a) Select either Auto or Manual. In automatic setting, the system graphs the entire range
of the time shown in a history record window. In manual operation, select the starting
time and ending time from the drop-down list box. The system graphs the data within
the selected range only.
• The starting time must be earlier than the ending time.
(5) Select enabled/disabled display of upper/lower limits. To view upper/lower limits in the
graph, check the box next to Upper Limit and/or Lower Limit and enter the value(s).
The upper limit value is indicated in a red line, and the lower limit value is in a blue line. Both
or either of the limits can be viewed.
(6) For the format of the peak name displayed in the legend box, select either “Strm# - Peak#
- Peak name (unit)” or “Only Peak name (unit).”
4th Edition : Mar. 21, 2012-00