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6.9 Simultaneous ACCA and
ACVG Survey
The PCMx allows users to conduct both an ACCA and
an ACVG survey simultaneously. By collecting the data
in one pass of the pipeline, rather than two, survey time
can be reduced significantly.
Procedure:
1. Connect the transmitter to the pipeline and ground
using the procedure described previously.
2. Set the PCMx transmitter to either ELCD or LFCD
mode.
3. Connect the A-frame to the PCMx locator via the
accessory socket, and turn on the locator.
4. The PCMx will automatically select ACVG mode
and an A-frame symbol will be displayed.
5. Press the ‘f’ key until the mode of the PCMx locator
matches either ELCD or LFCD as chosen from the
transmitter.
6. Begin your survey and with the PCMx on top and in
line with pipe, together with A-frame parallel to pipe.
7. The display will show the Fault Find direction arrows
and dBuV reading. Press the Antenna key once to
initiate a 4Hz current reading. Note: the arrows on
the display will now indicate the flow of PCM
transmitter current (CD) and not the Fault Find
direction arrows.
8. To save or reject a reading, press the Up or Down
arrow. Both Fault Find and 4Hz current data will be
saved in the log.
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