Guralp Systems digital equipment can operate in one of several transmission modes. These modes relate to how the unit uses its Flash memory. Read more...
This “how-to” explains the different ways to connect to a DM24 digitiser (or a sensor incorporating a digitiser module) with modem, as shown in the diagram below. Read more...
Güralp sensors and digitisers include comprehensive triggering facilities, which allow you to record seismic events in detail as they occur.
In this article, we will consider a Guralp digital sensor connected to a central recording station over a dial-up link. This link is too slow for real-time acquisition at high data rates. When an event occurs, we want the sensor to record high-rate data and save it in its Flash memory, so that it can be downloaded over the dial-up link at a later stage. Read more...
Güralp DM24 digitisers are available in three-channel and six-channel versions. (Both actually have an additional full-specification input channel so you may also see them referred to as four-channel and seven-channel units.)
A six-channel DM24 can be configured to appear either as a single six-channel system, with a single System ID and Serial Number (used to identify the streams), or as two virtual three-channel digitisers, sharing a single System ID but with two separate, distinct Serial Numbers. The only differences between the two modes are the names of the resulting output streams.
This document explains how to configure each of the modes and how to switch between them. Read more...
Guralp digitisers and digital instruments can be supplied with external triggering capabilities installed. The external trigger system is designed for maximum flexibility: you can trigger other digitisers or your own equipment using built-in relays and any equipment may be used as a trigger source, using the built-in opto-isolator. Read more...
In order to alert listeners that an event is in progress, the datalogger implements a ground motion notification mechanism. This mechanism implements a message bus over TCP which carries notifications as messages. Read more...
This document applies to systems running the Platinum operating system. This includes acquisition systems such as EAMs and NAMs, digitisers such as Affinity systems and DM24SxEAMs and digital instruments with embedded acquisition modules such as 3TDEs, 40TDEs and 5TDEs. Read more...
The DM24 has a 1kb buffer inside its firmware, which can be used to store information about attached sensors. Users are free to store any data they wish in the digitiser’s information block.
Typically, this is used to store calibration parameters, poles and zeroes, etc. Newer digital sensors have their calibration information pre-loaded into the information block, in the format described below. DM24mk3 instruments use this information to perform their strong motion calculations. Read more...
