HA243820
Issue 5 Mar 98
Section 3
Page 3 - 23
MODEL 346 INSTALLATION AND OPERATION MANUAL
3.5 CHART PRINTING (ANNOTATION OPTION REQUIRED)
3.5.1 INTRODUCTION
Three chart printing modes (noprint, over-print and breaktrace) are available and are fully discussed in the
instrument configuration description (section 4.9). Briefly,
NOPRINT
Turns off all character string printing.
OVERPRINT
Prints all character strings without changing the chart speed. Faster chart speeds cause the
printing to become taller (see ‘High Speed printing’, below) The printing appears on top of
the channel traces.
BREAKTRACE
Interrupts the chart timing to optimise print speed with legibility. The chart speed change, log,
alarm and custom messages are printed as quickly as possible by advancing the chart be-
tween each line of dots, as soon as each line is finished. Scales are printed at normal chart
speed.
Note...
If any change which affects the character of the record (Chart Speed, Trace History, Range Magnify, etc.)
takes place whilst other information is being printed, a red line is drawn on the chart when each change
occurs. The normal printing for each change is delayed until the current printing job is complete.
Alarm and Custom Messages interrupt all other printing jobs except the Log. An interrupt occurs only after a
line of text is completed.
Channel scale/descriptor and Time messages are printed alternately every 5 cm of chart (see figure below).
The channel scale and descriptor message is printed for a particular channel, only if the channel linearisation is
not selected OFF in the channel configuration.
The ID/Batch No./Chart Speed/Date/Time line is printed at the next 5 cm. interval after the highest number
channel scale.
The channel number is printed in the appropriate colour next to the channel trace, immediately above the de-
scriptor print line.
HIGH SPEED PRINTING
With high chart speeds, text characters become vertically elongated to the extent that they can become difficult
to read. For this reason, the following should be noted:
1. Time and channel descriptors are not printed at chart speeds greater than 400 mm/hr.
2. In overprint mode, alarm messages, custom messages and logging do not occur at chart speeds greater
than 400 mm/hr.
3. In break-trace mode, all printing except time and channel descriptors operate at all speeds.
