Guralp Systems CMG-3ESPCD - Manual (Page 7)

CMG-3ESPCD Digital Broadband Seismometer Introduction
port or to a Güralp Systems data module using the cable supplied. The
digitiser also controls the instrument's centring and mass locking processes.
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 Sensor response
The 3ESPCD can be supplied with a response which is flat to velocity from
100 Hz to any of 0.1 Hz (10 s), 0.033 Hz (30 s), 0.016 Hz (60 s), 0.01 Hz (100 s)
or 0.0083 Hz (120 s). Alternatively, a hybrid response function may be
provided. See section 7.1.1 on page 77 for more details.
If you do not require high-frequency data, a low-pass filter may be installed at
a frequency (below 100 Hz) that you specify.
MAN-C3E-0002 7 Issue B - November 2013