Guralp Systems CMG-40T - Manual (Page 4)

CMG-40T
1 Introduction
The CMG-40T is an ultra-lightweight seismometer consisting of three sensors
in a sealed case, which can measure the north/south, east/west and vertical
components of ground motion simultaneously.
The 40T has a rugged, waterproof stainless steel design for ease of installation.
The lightweight sensor elements are designed so that no mechanical clamping is
required. Because of this, the 40T is ready to record ground movements as soon
as you provide it with power. In addition, the sensor does not have to be
levelled or centred as long as the base is within 3 ° of horizontal. For the best
results, however, you should install where possible on a hard, near-horizontal
surface well coupled to the bedrock.
Each seismometer is delivered with a detailed calibration sheet showing its
serial number, measured frequency response in both the long period and the
short period sections of the seismic spectrum, sensor DC calibration levels, and
the transfer function in poles/zeros notation.
4 Issue A