Introduction
The seismometer unit is self-contained apart from its 12 V power supply. Centring
can be carried out by sending control signals to the instrument, either through the
hand-held control unit or through an attached Güralp digitizer.
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.
2.1
Options
2.1.1 Form factors
The CMG-3ESP can be supplied in several forms, besides its standard configuration:
•
The CMG-3ESP Compact is internally identical to the standard 3ESP, but has a
different arrangement of components allowing it to fit in a smaller casing.
•
The 3ESP can also be supplied in a slimline form factor, with vertically-stacked
sensors, suitable for installation in post-holes (see Section 3.5, page 17.)
•
The 3ESP is also available in borehole form as the CMG-3ESPB.
Any of these can be supplied with integral digitizers and data modules, allowing the
3ESP to form a complete, integrated seismic installation.
2.1.2 Output types
The standard 3ESP has a single 26-pin mil-spec waterproof connector for signals,
control and power.
4
Issue G - February 2016
