
350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 6 of 10
The frequency and amplitude of the tone current may affect the range measurement
capability and noise performance of the 350 System. Changes to the current and fre-
quency will not affect the accuracy of measurements made by the System.
The range information shown in Figure 8–1 applies only where the tone current at the
point of measurement is 30mA at a frequency of 25Hz.
8.3 SYSTEM TRIALS
This sub-section includes the practical results obtained using the 350 System at a
carefully established test site. The trials included measurements over a ±8 metre lat-
eral offset and a vertical range of 5 metres.
8.3.1 Trials Configuration and Procedure
The test site included the largest cable loop that could be laid in the available area
(see Figure 8–2). Equipment for use in the trials procedure included:
❐ A standard TSS 350 Cable Survey System.
❐ A hydraulic platform to support the coils of the 350 System.
❐ A loop of wire 60 metres in diameter as shown in Figure 8–2.
❐ A TSS Tone Generator to supply the cable loop with tone current at various ampli-
tudes and frequencies.
TSS conducted the tests using the central straight run of cable that spanned the
diameter of the loop. This arrangement reduced any effect that the current return path
around the outside of the loop may have had upon readings.
With the hydraulic platform located at the centre of the loop and the coil array posi-
tioned centrally over the test cable, the platform could raise and lower the coils to pre-
determined heights. The test procedure also specified the cable movements neces-
sary to simulate various lateral offsets.
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