Section 3
Page 3 - 26
MODEL 346 INSTALLATION AND OPERATION MANUAL
HA243820
Issue 5 Mar 98
3.5.5 RANGE MAGNIFICATION
When Range Magnification (see section 5) is actuated by action equation or through the operator menu, all
selected traces immediately change range. A line is drawn across the chart and new ranges are calculated by
the recorder based on the Magnification Factor.
The measured value at time of initiation is located at the centre, unless a ‘Magnification Centre’ value has pre-
viously been entered as a part of the relevant channel’s configuration. See section 5.5 for a full description.
Scale printing during magnification uses the new ranges. When magnification is turned off, all scales are
printed before the traces return to their originally configured ranges. Magnified ranges are printed as:
RANGE MAGNIFIED
CH 2 DISCHARGE FLOW MGD
20 45 70
CH 1 REACTOR PRESSURE PSIG
740 840 940
________________________________________
*
CH 2 DISCHARGE FLOW * MGD
0 100 * 200
*
*
CH1 REACTOR PRESSURE * PSIG
0 500 * 1000
3.5.6 TRACE HISTORY
When Trace History is activated, a line is drawn across the chart. Above the line the history chart speed and
‘history start’ are printed. After the printing of the Pre-event History, a further line is drawn and identified as
‘history trigger’, with the trigger time printed at the right edge of the chart.
Because Trace History can have its own magnification, all history scales are printed before the recorder returns
to its original status. Trace History is printed as:
HISTORY RANGES
CH 2 DISCHARGE FLOW * MGD
0 100 * 200
CH 1 REACTOR PRESSURE * PSIG
0 500 * 1000
HISTORY TRIGGER P13:46
200 MM/HR HISTORY START