Kongsberg Simrad SN90 Reference Manual page 564

Simrad SN90 Reference Manual
Generator
In order to run this test, a built-in signal generator is used. You must specify the
amplitude and frequency to be used by this generator. The signal generator creates
a test signal inserted in parallel with the signal measured on the transducer.
Transmit Pulse
Select or
Voltage
Voltage is always measured during reception. Voltage measurements during
transmission are not reliable. By default, the system measures current during
transmission.
Text lines
Several text lines are provided under the graphic presentation.
1 The upper information text line below the graphic presentation specifies the
current colour scale. The colours used are rated from the weakest (in dB) to
the strongest. If you have selected manual colour scale, the values shown here
will be the same as those selected.
2 Every sample received will have a value representing an echo. This is
identified as a non-zero value.
• The
Min(imum) non-zero
• The
Max(imum)
If you have selected automatic colour scale, the values will be the same as
those provided in the logarithmic scale in the upper text line.
The number of non-zero and zero samples are also specified.
• The
Non-zeroes
signal.
• The
Zeroes
echo. These are "dead" receiver channels.
3 The
Average signal level
from all the samples.
Related topics
Processor page, page 545
Element BITE dialog box, page 555
562
.
Current
value specifies the weakest echo received (in dB).
value specifies the strongest echo received (in dB).
value specifies how many samples that contain an echo
value specifies the number of samples that do not contain any
value presents the average signal level calculated
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