Guralp Systems CMG-6TD - Manual (Page 74)

CMG-6TD Calibrating the 6TD
6.3 Frequency response curves
The frequency response of each component of the 6TD is described in the
normalised amplitude and phase plots provided. The response is measured at
low and high frequencies in two separate experiments. Each plot marks the
low-frequency and high-frequency cut-off values (also known as –3 dB or
half-power points).
If you want to repeat the calibration to obtain more precise values at a
frequency of interest, or to check that a sensor is still functioning correctly,
you can inject calibration signals into the system using a Güralp digitiser or
your own signal generator, and record the instrument's response.
6.4 Obtaining copies of the calibration pack
Our servers keep copies of all calibration data that we send out. In the event
that the calibration information becomes separated from the instrument, you
can obtain all the information using our free e-mail service. Simply e-mail
[email protected] with the serial number of the instrument in the subject
line, e.g.
From: [email protected]
To: [email protected]
Subject: T6315
MAN-T60-0002 74 Issue F - February 2014