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The procedure for connecting sensors to the
is as follows:
1.
Place the
MicroTrap™
in a protective shelter and/or
a safe distance away from the detonation area. This
distance may be closer than what is considered safe for
the User. Once the setup is completed, the
does not require the User to collect the data; it does so
automatically without assistance.
2.
For each sensor you intend to use, run a length of coaxial
cable from the
MicroTrap™
excess length to compensate for cable shortening or
cable damage from each test (if applicable). Shorter lengths of coaxial cable may be connected together using the wire cutters
and electrical tape. A male BNC connector should be attached to the end of the coaxial cable that is to be attached to the Scope
inputs (labeled
1 2 3
4) on the back of the MicroTrap™. Convenient
purpose. The
Adapters
can be connected to the coaxial cable using the wire cutters and electrical tape. The connection should be
"shielding to shielding" and "center to center" conductor. Ensure that the center conductor and the shielding do not touch each other.
3.
Make note the calibration factors of the sensors being used. If using multiple sensors of the same type are to be used, make note of
the serial number and calibration factor of each sensor. These calibration factors are generally used in equations that relate voltage
to engineering units. You will need to enter these calibration factors into the
voltage versus time, to graphs of the appropriate engineering units versus time.
4.
Install your sensors in their final positions.
5.
Connect the coaxial cable to your sensors using the appropriate connectors, or your wire cutters and electrical tape. Note that the
polarity of the connection is typically important to indicate positive or negative readings from the sensors. The centre conductor of
the coaxial cable is termed "active" and the shielding is "common". Remember to connect and adjust the settings on your amplifier or
signal conditioner(s) as required.
6.
Connect the coaxial cables to the Scope inputs (labeled
7.
The
MicroTrap™
is now ready to begin the recording sequence, as detailed in
5.3 Signal Cable Protection
It is important to protect the gauge signal cable from damage caused by personnel and machinery operating at the test area. If testing
explosives, it is also important to protect the cable from damage caused by detonation of other holes and/or surface accessories such as
detonating cord, detonating relays, and shock tube bunch blocks.
The cables may be protected in many ways. Experience has shown that it is best to lead the
detonating cord and leave a barrier of sand or drill cuttings between the cables and the detonating cord. A danger point is the collar
area of the holes as the detonating cord or shock tube bunch blocks that initiate the downlines may cross directly over the
or coaxial cable. A good procedure is to protect the area where there is a cross over for about 1.5 m (5 ft) along the length of cable.
Experience has shown that a sand or stemming barrier thickness of 15-30 cm (0.5-1 ft) is sufficient to protect the cables.
5.4 MicroTrap™ Setup Procedure For Recording Voltage Signals
Now that your sensor(s) are placed and connected to the MicroTrap™, it is time to being the recording sequence. Remember that the
MicroTrap™
should already be programmed with the appropriate number of tests, number of channels per test, record rates, trigger level,
and pre-trigger memory allocation as described in
T: +1-613-545-0466
MicroTrap™
MicroTrap™
to that sensor with enough
Chapter
1.4.
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BNC Adapters
have been supplied with the
MREL Data Acquisition Suite
1 2 3
4) on the back of the MicroTrap™.
Chapter 5.4
www.mrel.com
1 2 3 4 Connectors
MicroTrap™
to convert the graphs of
below.
PROBECABLE
and coaxial cable under the
4 3
for this
PROBECABLE
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