Yokogawa DR240 - Manual (Page 35)

2-9 IM DR232-01E
2
Functions
Recording Span
The maximum value and the minimum value of the measurement range are decided when setting
the type of input. The difference between the minimum value and maximum value which will be
recorded within this measurement range, is called the recording span. The value on the left and
right side of the recording are called the left span and right span respectively.
Starting/Stopping Recording
Usually starting/stopping movement of the chart and trend recording is carried out by pressing the
appropriate key on the operation panel. But movement of the chart and trend recording can also
be started/stopped upon alarm occurrence or by remote control (event/action function).
Recording Method of Trend Recording
Chart movement can start by either key operation or event/action function and selected channels
will thus be recorded as trend recording.
Normal Recording
Selected channels will all be recorded regardless of the below mentioned occurrence/release of
alarms or group settings. Recording will start when the chart starts moving.
Trend Recording upon Alarm Occurrence
• Trigger Recording
All channels where an alarm occurred will be recorded. Even when the alarm is released,
recording will continue.
• Level Recording
All channels where an alarm occurred will be recorded. When the alarm is released, recording
will stop.
Group Trend Recording
Channels can be clustered in a group, and only those channels will be recorded.
Recording Zone
The recording span of measurement values on the chart is called recording zone. For each channel
you can set between what locations on the chart the measurement values will be recorded.
It is possible to assign zones so that the analog trend recordings of each individual channel will
not overlap. This setting is only valid for trend recordings in the analog trend mode. The default
setting is the full recording width of 250mm.
The left and right boundary of the recording zone (left position and right position respectively)
correspond to respectively the left and right span of the recording span.
Zone 1 Zone 2 Zone 3
Left position of zone 1
(=left span of ch1)
Right position of zone 1
(=right span of ch1)
Trend of channel 1 Trend of channel 2 Trend of channel 3
Scale Values
Scale values are used to mark the divisions of zones and three different scale format can be
selected.
2.3 Recording Functions