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350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 20 of 32
The Run/Display screen (Section 6.2.1.2) and the Forward Search screen (Sec-
tion 6.2.1.3) both include a display of the signal voltages received on each chan-
nel.
The Spectrum analyser (Section 6.2.1.4) display shows a clear representation of
the received tone signal and the level of noise frequencies across the received
band.
The oscilloscope display shows the actual received signal after amplification but
before signal processing. You may use this display to check for the effects of coil
saturation (Section 6.2.1.4).
At a pre-set interval, the System will remind you to check the tone frequency. Use the
System Parameters to set a suitable value for the reminder interval, up to a possible
360 minutes. The default setting is 30 minutes. A setting of zero switches off the
reminder facility, but you should not use this setting.
Coil Calibration Constants
During manufacture of the 350 system, TSS takes every care to match the coils and
their pre-amplifiers to each other. However, there will inevitably be some small resid-
ual differences between individual sensing coils.
Each of the sensing coils supplied by TSS has an identification plate that includes a
calibration constant. The 350 system requires this information so that it can compen-
sate for the residual differences between sensing coils.
During the coil installation process (Section 3.2.2), you should have recorded the cal-
ibration constants for each of the six coils, together with their serial numbers and loca-
tions. The Configuration Log form in Appendix F includes a suitable space for you to
record these details.
TSS supplies the System with the port and starboard coil triads already assembled,
and with the SDC configured with the relevant calibration details. Use the System
Parameters window to check the calibration values are correctly configured.
If you exchange a sensing coil for any reason, enter the new five digit value for the
calibration constant in the relevant box on the screen. Do not change any other val-
ues.
Each of the six calibration constants will be different, and you must enter them care-
fully. The numbers include an error-checking element that helps to ensure valid data
entry.
6.2.2.1 Altimeter
The Altimeter option allows you to change the altimeter configuration for specific
installations and to view data transmitted by an altimeter connected directly to the
SEP.
To view data transmitted by an altimeter connected to an SDC serial communication
port, use the Terminal Window described in sub-section 6.2.1.4.
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