Log on Change
25
LOG-ON-CHANGE (ONLY LOG/CHART OUT OF LIMITS
READINGS)
This feature reduces the size of log and chart files by
ignoring readings that are within adjustable specified limits.
To specify the limits;
Double click
in the
inst.1 Min
column and enter the
value
below
which readings are to be
logged. Repeat in the
Max
column, and
enter the value
above
which readings
are to be logged.
Check
the radio button
record when out of
tolerance
, and
Click
the
OK
button.
The chart will now only register
out of
limits
readings which will be separated
by grey vertical bands signifying periods
of
in limit
readings. It will still be
necessary to set the
Sample Frequency
buttons.
Check
the radio button
record all readings
to
return to normal logging/charting.
Factor and Offset adjustments
A factor adjustment
can be made to enable readings of
differing orders of magnitude to be charted on the same
scale. For example, a X10 factor applied to ambient
temperature readings would enable them to be charted
alongside process temperatures of 200
o
/400
o
C -
400
o
/1470
o
F. Factor adjustments can be greater or less than
one.
Offset adjustments
can be applied to any trace to adjust its
position with respect to the scale. For example, the readings
from a particular instrument may be known to be 4
o
low
due to poor siting of the sensor. An adjustment of +4 in the
Offset column will remove this error.
Sizing and positioning your chart
Click
to make the chart smaller or larger.
If required, it is possible to super-impose
a small chart screen on top of or beside
the
CALCOMMS
screen so that both are
visible.
Other Logging and Charting Options
