Minimate Pro Operator Manual 10–3
10.4.1. Soft Surface Installations
Always install and use the ground spikes provided with the Geophone. For the best installation, it
is suggested to bury the Geophone, or for very low level velocities, place a sandbag on top of it.
a. Burying and using the Ground Spikes with the Geophone
1. Screw the three ground spikes into the bottom of the Geophone and tighten.
NOTE: Do not over-tighten the ground spikes as this can damage the casing of the
Geophone.
2. Dig a hole from four inches (10 cm) to six inches (15 cm) deep.
3. Aim the arrow on the top of the Geophone in the direction of the Event.
4. Firmly press on top of the Geophone to push the spikes fully into the ground. Check
the Geophone to ensure it is securely in place and level.
5. The ground must be hard and compact with no loose material between the Geophone
and the compact ground material.
6. Compact the material around the Geophone while back filling to secure it to the
surrounding ground material.
7. Ensure that the Geophone is securely attached to the Vibration port on the
Minimate Pro.
8. Press the Sensor Check key on the Minimate Pro to ensure that the sensor is
properly attached.
b. Sandbagging the Geophone –Very Low Velocity Levels Only
Use this method of installation for monitoring where velocity levels remain very low.
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