CMG-40TDE
Triaxial seismometer
Operator's Guide
Part No. MAN-040-0004
Designed and manufactured by Güralp Systems Limited
3 Midas House, Calleva Park Aldermaston RG7 8EA England
Proprietary Notice: The information in this manual is proprietary to Güralp Systems Limited and may not be copied or distributed outside the approved recipient's organisation without the approval of Güralp Systems Limited. Güralp Systems Limited shall not be liable for technical or editorial errors or omissions made herein, nor for incidental or consequential damages resulting from the furnishing, performance, or usage of this material.
Issue A 2012-08-31
Table of Contents
1 |
Introduction........................................................................................................................... |
3 |
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1.1 |
Connections.................................................................................................................... |
6 |
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1.1.1 DATA........................................................................................................................ |
6 |
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1.1.2 NET........................................................................................................................... |
7 |
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1.1.3 GPIO.......................................................................................................................... |
7 |
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1.1.4 USB........................................................................................................................... |
7 |
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1.1.5 GPS........................................................................................................................... |
7 |
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2 |
Getting started....................................................................................................................... |
8 |
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3 |
Understanding the manuals................................................................................................. |
9 |
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4 |
Connector pin-outs.............................................................................................................. |
10 |
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4.1 |
DATA............................................................................................................................ |
10 |
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4.2 |
NET............................................................................................................................... |
11 |
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4.3 |
GPIO.............................................................................................................................. |
12 |
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4.4 |
USB............................................................................................................................... |
13 |
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4.5 |
GPS................................................................................................................................ |
14 |
5 |
Revision history................................................................................................................... |
15 |
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Operator's Guide
1Introduction
The CMG-40TDE seismometer is a three-axis, broad-band, forcefeedback seismometer packaged together with a 24-bit digitiser and a flexible data acquisition and storage unit, all in a single sealed case. The entire system is selfcontained except for its power supply.
The 40T system combines low-noise components with high feedback loop gain to provide a linear, precision transducer with a large dynamic range.
August 2012 |
3 |
CMG-40TDE
The CMG-40TDE 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.
The CMG-40TDE consists of three internal modules, the 40T sensor, an integrated digitiser and an integrated data acquisition system
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Issue A |
Operator's Guide
The integrated digitiser is a CMG-DM24, a low-noise, 24-bit ADC module specifically designed for seismic data. The built-in digital signal processor (DSP) provides simultaneous, multiple sample-rate data streams at user-selectable rates. Up to 6 streams of data for each component are available at sample rates from 1 to 1000 samples/s. A precision microprocessor-controlled time-base synchronizes the analogue-to-digital converters to the DSP and provides time-stamps for data. A separate microprocessor system handles configuration and sensor control, including mass centring and calibration.
The integrated data acquisition system is a CMG-EAM, which provides serial and Ethernet communications, along with a convenient web-based interface to all functions, including digitiser and sensor configuration and control. It can act as a data recorder as well as a protocol converter and communications controller. Based around the powerful and stable Linux operating system, the CMGEAM 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.
August 2012 |
5 |
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