Teledyne 440, System Manual, Page: 82 / 256

5 – Operating Software
5-16 © Teledyne TSS DPN 402196 Issue 4.1
nications between the SDC and the SEP. For successful operations in the 440 mode this
should always show ‘440 Data GOOD’.
❐ System time
The system time is derived from the SDC system clock.
❐ System errors
The status bar shows the total number of uncleared system errors registered by DeepView.
Use the System Errors Window, described in
section 5.3.2.5 "System Errors Window" on page
5-18 , to see details of all the system errors registered since you powered-on the SDC, up to a
maximum of 600 lines.
❐ External Output status
❐ Logging status
Two fields in the status bar indicate the ON/OFF condition of the external output (used for log-
ging to a user-supplied data logger and to provide information for use by the optional video
overlay feature) and the internal logging.
Panel O shows the skew of the vehicle (the heading relative to the cable).
A thick coloured line P indicates the target position relative to the ROV centre line. As the survey starts,
this line extends upwards from the bottom of the screen until it reaches a point near the top of the snail
trail pane. The top of the line then continues to move to the left and right as the lateral offset of the
target changes while the remainder of the line scrolls vertically downwards in a ‘waterfall’ style of
display.
Segments of the line P can have any of three colours:
If the System receives no altitude information, a good target signal will always appears as a light grey
line.
If a target scaling value greater than 2000uV is used and the centre coil voltage is greater than both the
port and starboard signals by a value larger than the signal threshold, the Snail Trail and Coverage
Windows will adopt colours specific to this situation.
If the target is covered, the Snail Trail and Coverage Windows will display the target in dark green.
If the target is uncovered, the Snail Trail and Coverage Windows will display the target in light green.
5.3.2.2 Toggle Height Scale
Dependent upon specific survey requirements, the Height Scale Display
g
on the Run Window can be
modified. For example, if a small target is being tracked a reduced height scale may be required. This
feature provides the user with control over the displayed height range.
The vertical ranges for the 440 System are either 0m to 2m or 0m to 5m.
Light grey Good signals supplied by the coils. The target is covered.
Dark grey Good signals supplied by the coils. The target is exposed.
Dark blue The lateral range is outside 2m