100/180 MM GRAPHICS RECORDER: USER GUIDE
User Guide
Page 41
HA261742
Issue 16 Nov 04
3.4.6 Circular Trend Option
This option is available for 180 mm versions of the recorder only.
If this option is fitted, it replaces Vertical bargraph mode in the display scroll list, the Goto View menu and in the
Views configuration page (
).
The option allows up to 12 points to be traced as though on a circular chart. More than 12 points can be included in
the group, but only the first 12 traces and their associated faceplates are included in the real-time display. Entering
Trend History mode (by using the Options button or by continuously touching the screen for a few seconds), allows
all the points to be reviewed, but only in vertical trend history mode, described in
The option provides two alternative views called 'Full Screen' and 'Normal View'. These views are toggled between
by means of a push-button key near the top left corner of the screen. In each case, faceplates can be displayed, or not,
as required, using the Option key 'Faceplates On/Off' selection. The diameter of the chart is independent of faceplate
on/off selection. When quitting History, Normal view is always returned to.
Note: Alarm marks (section 3) do not appear on circular trend scales.
TREND MODES
The way in which traces are laid down on the chart depends on the action to be taken when the chart is 'full', as set up
in group configuration -
. The user can select 'Rotate' or 'New Chart'.
ROTATE
In the following description, the word 'segment' is used interchangeably with 'Major chart division'. The number of
Major chart divisions is a function of the selected chart speed, as described in Group Configuration (
With 'Rotate' selected, the traces start one major chart division anti-clockwise from the top of the chart and trace
clockwise until they reach the top of the chart ('12 o'clock'). At this point, the chart, complete with time stamps and
traces, rotates one major chart division anticlockwise, and the tracing process continues. When the chart is 'full', the
oldest segment-full of tracing is removed, leaving an empty segment to be traced-on when the chart rotates.
Figures 3.4.6b and 3.4.6c, below show Circular trending in 'Rotate' mode.
NEW CHART
With 'New Chart' selected, tracing starts at top of the chart (12 o'clock) and continue to trace clockwise round the
chart, back up to the vertical. When the chart is full, it is cleared, new timestamps are displayed, and tracing re-starts
from the top of the chart.
The start time of the tracing can be set as a part ('Start at') of group configuration, the choices available depending on
the time per revolution setting. The start time is placed at top centre of the chart, and 'backfilled', clockwise, round to
the current time.
Figure 3.4.6a, below, shows New Chart mode.
Note: The use of '12 o'clock' above is intended to be illustrative and only to explain angles in terms of a
normal analogue clock face. It does not mean that this position must actually be noon or midnight in real
time.
