Guralp Systems CMG-5TD Installation
Installation
1
CMG-5TD
Accelerometer
Check you have all components and cables.
•CMG-5TD strong motion broadband accelerometer
•GPS Receiver
•Blue/grey sensor data and power cable
↔
•Brown GPS sensor cable
•Sensor calibration data booklet
You will need a 12–24 Volt DC power supply and a
Windows or Linux PC with an RS232 (COM) port.
Keep the packaging, in case you need to transport the
sensor at a later date.
Prepare the installation site. The instrument should be installed on a solid surface, such as a
2
concrete floor.
To create a suitable surface in a temporary site:
1. Dig a pit, or machine-auger a suitable hole for the sensor.
2. Prepare a quick-setting cement/sand mixture, and pour it into the hole.
3. Agitate (“puddle”) the mixture until the surface is level.
4. Leave the mixture for between 2 and 12 hours, depending on the type of cement used.
Scribe an accurate North/South line on the surface.
↔
3
Place the sensor in position and rotate it until it’s studs
and orientation lines align with the scribed line.
If you are using a base-plate and ring:
1. Fit the longer three screws half way into alternate
holes in the round base-plate and add a lock-nut to
each (left-hand top picture).
2. Drill through the centre of the North/South line and
use the anchor bolt to fasten the round base-plate to
the surface with the screw-heads uppermost. Rotate
to the correct orientation before tightening.
4. Screw the indented mounting ring onto the bottom of
the sensor (right-hand top picture).
5. Fix the sensor onto the base-plate using the shorter
set of three screws through the mounting ring.
6. Use the bubble level to check the sensor attitude and
adjust the mounting feet as required.
Installation
4
CMG-5TD
RS232
PC
+
Power
supply
Connect the various components together:
GPS
–
•Connect the brown cable from the GPS receiver to
the GPS connector on the sensor;
•Connect the 9-pin ‘D’ connector on the blue cable to
your PC’s serial (COM) connector;
•Connect the free, stripped end of the grey cable to
the power supply. Connect the black wire to the
negative (–) terminal and the red wire to the positive
(+) terminal;
•The blue and grey cables are joined together at a 10pin mil-spec socket. Attach this to the DATA
connector on the sensor. Do this step last.
5
6
Start the PC and run Güralp Systems’ Scream! software.
If you have not run Scream! before, the Setup window
will open. Otherwise, choose File → Setup... from the
main menu and view the Com Ports tab.
Set the Baud Rate to 38,400 and click OK. Data
streams should start appearing in the main window.
Highlight the Z, N and E streams by control-clicking
them and press Enter to open a waveview window.
Remove the screw-on cap protecting the offset
adjusters. With a small screwdriver, adjust each offset
until the corresponding output in the waveview window
is close to zero. Zoom in as necessary.
Replace the pressure cap. The sensor is now ready for
use.
Please refer to the full manual for detailed
instructions on usage, calibration and
troubleshooting.
MSH-050-0003-C : Page 2 of 2
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