Simrad EQ60 - Manual (Page 60)

Simrad EQ60
48
857-164342 / Rev.C
1 Position the cursor over the Line field.
2 Press the left mouse button.
The line number increments, and the Line field is presented
with a red colour.
Stop recording
To stop the recording:
1 Click the Line field once again.
- The original colour is restored.
Size of stored raw data
The total size of raw data files stored on disk during operation
depends on several user selections. From these selections you
may estimate approximately the total amount of raw data stored
in a given time period for each installed channel using the
following equation:
X = (B bytes per sample) S ((8 S R) / (c S tau samples per ping))
S (M ping per sec) S 24 S (3600 sec per day) S (K days)
Where:
X = Total amount of stored raw data in bytes for one channel
B = 4 (Given by the echo sounder)
R = Maximum range in meters (User set)
c = Sound speed in water in meters per sec (User set)
tau = Pulse duration in seconds (User set)
M = Ping rate in ping per seconds (User set)
K = Number of operating/storage days (User set)
Thus, you can affect the amount of stored raw data by changing
e.g. the range, pulse duration, and ping rate settings.
Example:
With range = 10 m, pulse length = 256 µS, 15 pings per second
and sound velocity = 1500 m/s, the storage requirement will be
45 Mb per hour. If you increase the range to 80 m, and reduce
the ping rate to 7 pings per second, the storage requirement will
be 60 Mb per hour.
Related topics
→
Store, page 108
→ Status bar and Line field, page 64
Playback
When replaying the recorded signal, the ping rate is not limited
by the speed of sound in water. Hence, a higher ping rate is
possible during replay than during normal operation.