Guralp Systems Limited
MAN-T60-0001 - CMG-6T Operator's Guide

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1. Introduction 2. First Encounters 3. Calibrating the CMG-6T 4. Connector pin-outs 5. Specifications 6. Revision history

Section Index: 1.1. Response options

Chapter 1. Introduction

The CMG-6T is an ultra-lightweight seismometer consisting of three sensors in a sealed case, which can measure simultaneously the North/South, East/West and vertical components of ground motion over a wide frequency range. This frequency response is made possible by advanced force-balance feedback electronics.. It is ideally suited for rapid, temporary installations in locations with medium noise.

The 6T has a rugged, waterproof, lightweight aluminium design for ease of installation. The robust sensor elements are designed so that no mechanical clamping is required. Because of this, the 6T 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 the horizontal. For the best results, however, you should install where possible on a hard, near-horizontal surface, well coupled to the bedrock.

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.

1.1 Response options

The 6T 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) or 0.01 Hz (100 s). The 6T is also available as the high-frequency CMG-6T-1 variant, which has a 100Hz to 1s response.

Two variants, the CMG-6V (vertical) and CMG-6H (horizontal), are available for single-component applications.

Next

1. Introduction 2. First Encounters 3. Calibrating the CMG-6T 4. Connector pin-outs 5. Specifications 6. Revision history