Unexpected Signal Variation During Normal Operation - Teledyne 440 System Manual

9 – Maintenance

9.3.4 Unexpected Signal Variation During Normal Operation

Rest the ROV on the sea-
See sub section 7.2.4
For background compensation
Yes
System OK
Yes
System OK
Figure 9-13: Signal shifts – CHART 1
9-20
Signal variation with
ROV less than 3m off
of sea bed
bed
Perform a background
compensation
Check if the signal
variation is less than
10 µV
Variation more
Signal
than 10 µV
Variation
Variation less than 10 µV
Lift the ROV off the
seabed to 3m
Signal
increase less
than or equal
to 10 µV
No
Water
Temperature
set OK?
No
Yes
Perform Manual
Compensation
Section 6.
Lift ROV off the sea-bed
to 3m
Signal
increase less
than or equal
to 10 µV
No
Go to Chart 2
© Teledyne TSS
Is the
ROV
Stationary?
No
Yes
How many
channels are
affected?
More
than
one
One
Check the faulty
channel
Refer to sub-section 10.3.1
for single channel faults
DPN 402196 Issue 4.1