Guralp-systems CMG-6T Manual de usuario descargar pdf (Pagina 16)

CMG-6T

1. Prepare a hole of 60 – 90 cm depth to compacted subsoil, or

down to the bedrock if possible.

2. On granite or other hard bedrock, use an angle grinder to plane

off the bedrock at the pit bottom so that it is flat and level.

Stand the instrument directly on the bedrock, and go to step 7.

3. On soft bedrock or subsoil, you should install a pier as depicted

below.

4. Pour a layer of loose, fine sand into the pit to cover the base.

The type of sand used for children's sand-pits is ideal, since the

grains are clean, dry and within a small size range. On top of

the sand, place a smooth, flat granite plinth around 20 cm

across, and shift it to compact the sand and provide a near-level

surface.

Placing a granite plinth on a sand layer increases the contact

between the ground and the plinth, and improves the

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Guralp-systems CMG-6T Manual de usuario Pagina 16