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6 – Operating Procedure
(a)
(b)
With a level
With applied roll
coil array
Horizontal
Range
Error
Figure 6-5: The effects of roll on measurement accuracy
For a target located centrally under the coil array as shown, the displayed value for lateral offset will
contain an error as follows:
Error
=
Z
sin
Roll angle
Where Z = the vertical distance between the centre of the coil array and the top of the target.
For example, measurements on a target located 1.0m below the centre of the coil array will include a
lateral offset error of 0.17m with 10° of roll applied to the ROV.
Vertical measurements made by the 440 System are relatively unaffected by small angles of roll. Under
the conditions described in the above example, the vertical measurement will contain an error of only
15mm.
6.6 Altimeter Data Format
You may use certain types of altimeter manufactured by Datasonics, Ulvertech, Simrad and OSEL with
the 440 System.
See
section 4.1.6.2 "Connection to the SDC" on page 4-7
for instructions to connect one of these
alternative types of altimeter to the SDC. You may connect the Datasonics unit either to the SDC
'COM2' port or directly to the SEP 'Altimeter' port.
You must configure the display software to use your altimeter type. See
section 6.2.2.1 "Altimeter" on
page 6-19
for instructions to do this.
The descriptions below include the individual data formats and the RS232 parameters for each type of
altimeter that you may use with the 440 System. Except for the OSEL altimeter, transmission starts
immediately after power-on.
Note that DeepView removes all spaces present in the altimeter string before interpretation. This is
because the UK90 format sometimes includes extra spaces which are not defined in its specification.
This removal of spaces applies to all types of altimeters which are connected directly to the SDC.
6.6.1 Benthos PSA 916
The PSA 916 transmits data at 9600 baud using 8 data bits, 1 stop bit and no parity by default. For
alternative configurations see its separate user manual.
DPN 402196 Issue 4.1
© Teledyne TSS
6- 35
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