
350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 8 of 10
8.3.2 Results
8.3.2.1 Accuracy
Tables 8–1 and 8–2 below show details of the errors measured in the vertical and lat-
eral offsets between the target cable and the centre of the coil array.
Notes:
1. Positive values show that the vertical range or the lateral offset indicated by the
350 System was greater than the distance measured using a tape measure.
2. The response of the 350 System proved to be symmetrical about its central axis. The fol-
lowing tables therefore show only the response to the port side.
3. Lateral offsets, vertical range, and errors are all listed in units of centimetres.
4. ‘o/s’ signifies that the 350 System switched to one-sided calculations – to indicate which
side the cable lay but not its offset distance.
Tables 8–1 and 8–2 indicate the measurement accuracy that you may achieve using the
350 System under ideal conditions. These tables are for general information only – you
should not use them to correct measurements you have already taken.
Table 8–1: Vertical measurement errors
Vertical
range
Lateral offset
-800 -600 -400 -300 -250 -220 -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0
500 -129 -95 -58 -27 -27 -28 -26 -22 -15 -14 -10 -10 -9 -7 -6 -2 -1
400 -89 -74 -37 -12 -12 -11 -9 -6 -4 -4 -2 -4 -5 -4 0 3 5
350 -72 -64 -34 -11 -11 -7 -3 -2 -1 1 2 2 1 3 4 7 8
300 -48 -44 -24 -7 -5 -2 0 2 1 2 3 2 2 1 5 8 11
250 -19 -34 -22 -7 -4 -3 -1 0 1 2 4 3 4 4 4 4 6
200 -29 -27 -16 -4 -2 1 2 3 1 4 5 4 2 1 2 1 7
180 o/s o/s -15 -4 -2 -1 1 2 3 5 5 5 3 2 -1 2 6
160 o/s -10 -14 -3 -2 0 2 2 2 2 3 4 3 2 0 4 6
140 o/s o/s -9 -2 0 2 3 3 3 5 6 6 5 3 0 2 4
120 o/s o/s -4 -1 1 3 4 4 5 4 3 4 4 4 2 4 4
100 o/s o/s 1 1 0 1 2 3 3 4 6 4 3 1 0 2 1
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