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This configuration can be used for centimetre accurate transmitter location as per section
3.5 ACCURATE TRANSMITTER LOCATION. If the null spot cannot be found try increasing
the distance between the transmitter and antenna and/or reducing sensitivity.
3.3. PRE-DEPLOYMENT CHECKS
Before each deployment ensure that the following checks have been completed.
1.
Ensure that the system has been installed as per section 4.2 3002RS ROV SYSTEM
INSTALLATION.
2.
Visually inspect all system components to ensure that they are secure and undamaged.
Pay close attention to all cables and connectors. Refer to section 4.2 3002RS ROV SYSTEM
INSTALLATION.
3.
Ensure that the antenna is mounted so that it will be orientated parallel to the expected
transmitter orientation for general tracking applications. Refer to section 4.2 3002RS ROV
SYSTEM INSTALLATION
4.
Confirm that the 3011 EM POD is being supplied with +24VDC from the ROV with the
correct polarity. Refer to section 4.4.2 BURTON 5507-1508 BULKHEAD.
5.
Ensure the 3002RS is turned ON and the batteries are showing more than 50% remaining
capacity. Refer to section 5 3002RS BATTERY TEST AND REPLACEMENT.
6.
Confirm the RS232 data link is configured as per section 4.3 RS232 LINK SETTINGS and
enabled.
7.
Complete 3.2 3002RS SYSTEM FUNCTION TEST
8.
If using AUDIOSCOPE, confirm that it has been configured and tested as per the
AUDIOSCOPE manual.
3.4. APPROXIMATE TRANSMITTER LOCATION
Before each use ensure that all checks in section 3.3 PRE-DEPLOYMENT CHECKS are
completed. The typical procedure for determining the approximate position of a 22Hz
electromagnetic transmitter is given below.
1.
Switch ON the 3002RS by turning the SENSITIVITY & ON/OFF control
clockwise, set the sensitivity control to half scale and ensure the mode
toggle switch on the front of the 3002RS is in the RS232 position.
2.
The antenna should be held stationary and as close as possible to the
pipeline. Ideally it should be placed directly on top of the pipeline. The
antenna should be orientated parallel to the expected transmitter
orientation as shown to maximise received signal and range.
3.
Increase the sensitivity to the maximum setting possible without allowing the background
noise level to exceed 30% on the bargraph. The optimum background noise level for
identifying an EM signal is typically 30% or less. It will be extremely difficult to detect a
signal if the background noise level is more than 70%. If the background noise is more
than 70% then the 3002RS sensitivity must be reduced or the source for the excessive
background noise must be identified and removed. Note that more sensitivity is not always
best, if there is significant background noise and the sensitivity is too high then the
transmitter signal may be hidden by the background noise. Depending on the frequency of
the background noise there may be no indication of the noise level on the 22Hz bargraph
3002RS_5002_A01
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