Güralp 5TDE
Introduction
Güralp EAM offers unrivalled flexibility, even including the ability to run user-
installed scripts.
Each instrument 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 Setting the gain
The built in 5T sensor has a very large dynamic range. In order to exploit the
whole of this range, two separate outputs are available, one with high gain and
one with low gain. Normally, the high gain outputs are set to output a signal 10
times stronger than that from the low gain outputs. Only one set of outputs –
low gain or high gain – is sent to the digitiser and selection is made using
internal jumpers.
Note:
To change the gain, it is necessary to open the instrument.
This work must be carried out in a clean environment in order to
prevent contamination of the mechanical components by air-borne
dust.
Caution: ESD:
The Güralp 5TDE include components which can be
damaged by electrostatic discharge. Always work on a properly
grounded dissipative surface and wear a suitable grounded wristband.
Ground yourself by touching an earthed conductor before handling
any of the circuit boards.
In order to change the gain-setting jumpers, remove the instrument's lid as
follows:
•
Use a large, flat-bladed screwdriver to remove the pressure-release
screw located on the instrument's lid next to the bubble-level.
Caution:
Instruments are assembled at sea-level so there
may be a considerable pressure difference if opened at
altitude. Take care that the pressure-release screw does not
fly off during removal.
•
Use a small, flat-bladed screwdriver to remove the six small screws
located around the edge of the top of the lid.
•
Note the location of the lid with respect to the body. Use a pencil or
adhesive tape to mark both so that the instrument can be reassembled
in the correct orientation.
•
Using a medium, flat-bladed screwdriver, gently prise the lid away from
the body. A slot is provided in the top of the cylinder for this purpose.
Caution:
The lid-to-body seal uses 'O'-rings. Take care that
the lid does not suddenly fly off when this seal is broken.
MAN-050-0006
6
Issue E - August, 2017
