LADD IP Holdings Pty Ltd atf BMT IP Discretionary Trust TRV5R2Y Manual Do Utilizador
BMM
®
System
Manual
– Monitoring Procedures
16
www.bmt.com.au
o Don’t spend too much time getting the precise location of this peak. At this stage
you are just trying to find the approximate location of the peak, so
1 m is good
enough.
o Turn 90
and move the Detector. If the signal decreases you are going the wrong
way so walk in the opposite direction, towards the increasing signal strength.
Walk forward until the signal starts to decrease. Return to the peak (location
Walk forward until the signal starts to decrease. Return to the peak (location
).
o You are now close to the BMM
®
and it is time to pinpoint the location.
h) Stand still and move the Detector across your body in a straight line
at constant elevation (refer to Section 4.2) to locate a maximum
value (location
value (location
).
i) Turn 90
and repeat the scan technique to locate the maximum
signal strength in that direction (location
).
j) Repeat steps (d) and (e) until you are confident that you have
located the peak.
k) Place the receiver coil level on the ground, at the location of the
peak signal. Review the display – Is the Range realistic for the
expected depth? Is the BMM letter correct? Is the peak validated? (see Section 4.5) If
satisfied, press
expected depth? Is the BMM letter correct? Is the peak validated? (see Section 4.5) If
satisfied, press
Store Reading
to record the signal. Hold it still while the Detector displays
Please wait...
A different tone will sound when complete.
l) Mark the location with a suitable marker (stake, flag, paint, etc.) and write the BMM
letter (from the Detector), on the marker. This letter must be recorded when the point
is surveyed.
is surveyed.
m) Repeat until all transmitting BMM
®
s have been located – one or more may fail during
the blast.
n) Switch the Controller and RPM off when complete – the data is stored for later
downloading.
4.4
Graphical Display
The graphical representation of the signal strength on the Controller is designed to be more
intuitive and easier to use than looking at a 4-digit number that is constantly changing. This is
because all of our senses are analogue – we don’t process digital data as efficiently as analogue
information. If the signal was perfectly stable then it wouldn’t be too bad but environmental
interference means that there will constantly be some random fluctuation of the signal and the
more it fluctuates, the more difficult it is for an operator to “process” the numeric data to
determine whether that average is going up or down.
The most efficient search procedure, set out in this manual, is based on simply knowing whether
the signal is increasing or decreasing, and indeed, looking for the point where it changes from
increasing to decreasing. The graphical display clearly shows these humps, even if the signal is
intuitive and easier to use than looking at a 4-digit number that is constantly changing. This is
because all of our senses are analogue – we don’t process digital data as efficiently as analogue
information. If the signal was perfectly stable then it wouldn’t be too bad but environmental
interference means that there will constantly be some random fluctuation of the signal and the
more it fluctuates, the more difficult it is for an operator to “process” the numeric data to
determine whether that average is going up or down.
The most efficient search procedure, set out in this manual, is based on simply knowing whether
the signal is increasing or decreasing, and indeed, looking for the point where it changes from
increasing to decreasing. The graphical display clearly shows these humps, even if the signal is