10 PCM
+
Operation Manual
Touch Gain Control and Bargraph
Control of the gain is via the up and down arrows increase
or decrease PCM
+
gain level. The lower the gain reading,
the stronger the signal source.
Signal strength is shown on the bargraph.
The numerical display shows the bargraph percentage.
If bargraph indicates full scale, the numerical display
indicates 99.9; touch the gain control once counter
clockwise to reduce to 60% of full scale.
3.6 Depth measurement
The depth measurement is automatically displayed in all
modes except 8KFF and ACVG. Depth measurements
are displayed as follows:
Less than 1 Meter, depth displayed in cm.
Greater than 1 Meter, depth displayed in m.
Less than 3 feet – distance is displayed in inches.
Greater than 3 feet – distance is displayed in feet.
Note: To obtain accurate depth measurement the PCM
+
must be directly over a pipe with the blade at right
angles to the target.
3.7 Locate current
Locate current is displayed automatically and can be
displayed in CPS, ELF, ELCD, LFCD and 8kHz modes.
Press and hold the function key to toggle between
depth and locate current. Locate current will be
displayed in mA.
3.8 Recording measurements
When a PCM
+
reading is taken and saved, the datalogger
in the PCM
+
will store the log number, PCM
+
current in
mA and dB, current direction, depth, phase angle and
locate current. When linked to a GPS compatible PDA
running SurveyCERT
™
, the datalog is updated with the
GPS position and time stamp.
The PCM
+
can store up to one thousand datalogs in the
receiver’s memory.
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Taking a Pipeline Current Measurement
To achieve accurate results the receiver must be kept as
still as possible and directly over the pipeline while taking
readings.
When taking measurements the white arrow on the
bottom of the magfoot should be pointing away from
the transmitter.
Press and hold the Antenna Select key to initiate the
PCM
+
current measurement.
The signal strength bargraph will scroll across the
screen and after 4 seconds the measurement cycle
is complete. The reading will remain on the display
until it is saved or rejected.
Note: Before the reading is saved or rejected the 4Hz
current reading is a ‘live’ reading. This is particularly
useful as fluctuations in readings may indicate the
presence of interference. The user may choose to
save the reading or move to another point along the
pipeline. If the 4Hz current reading is fluctuating the
user can go into the menu, select SIGL and select
‘LOW’. This feature is useful in areas where there may
be interference, in this mode the measurement cycle
will be longer than 4 seconds.
Once a measurement cycle has been initiated the PCM
+
provides the user with the ability to ‘hold’ the reading and
decide whether to save the reading or return to a ‘live’
reading. To ‘hold’ a measurement reading, carry out the
following:
When the 4Hz measurement cycle has completed
momentarily press the Antenna Select key, the 4Hz
current reading will now be frozen. To return the
4Hz reading to a ‘live’ condition press the Antenna
Select key.
To accept the reading press the Up arrow or to
reject the reading press the Down arrow key.
Note: A flashing reading means reading is marginal and
should be taken again. This may be caused by moving
metal or nearby vehicles.
Saving or rejecting readings
Once a PCM
+
current reading has been obtained a log
number 1-1000 is shown in centre-left of the display. This
is the log number that will be used if the reading is saved.
To save the reading press the Up arrow key and to reject
the reading press the Down arrow key.
Once the log is saved or rejected, the PCM
+
Receiver will
return to its previous locator mode.
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