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EDAS-24GN
Universal Earthquake Data Acquisition Server
The EDAS-24GN seismic data acquisition server is extensively utilized in various fields including earthquake monitoring, reservoir dam structure inspection, hydrological observation, scientific array deployment, reservoir-induced earthquake research, mine seismic detection, and urban active fault exploration. It is currently employed by seismic bureaus across all provinces, municipalities, and autonomous regions in China for earthquake surveillance. The server is widely adopted in both national and regional seismic networks, with nearly all stations utilizing EDAS series servers for real-time data transmission. Furthermore, the technology has been implemented in multiple international seismic networks, including those in Indonesia, Bangladesh, Cuba, and several other countries.
OVERVIEW
Description
The EDAS-24GN is a high-resolution seismic data acquisition server with an extended dynamic range and low-latency real-time data streaming capabilities, specifically designed for use in seismic observation stations, earthquake early warning systems, and integrated seismic monitoring networks. This device converts multiple analog voltage and frequency inputs into digital outputs while supporting data collection, recording, and network/serial port transmission. Featuring compact design, lightweight construction, and energy-efficient operation, it provides large-capacity data storage solutions tailored for modern geophysical applications.
Technical Parameter
Seismic data acquisition channel
▲Number of data acquisition channels: 1) 3/6 seismic/ strong earthquake/hypersingal data acquisition channels,2 ) 3/6 hypersingal data acquisition channels, 3) 3 frequency data acquisition channels;
▲Input signal full value: ±2.5V, ±5V, ±10V or ±20V, double-ended balanced differential input;
▲Input impedance: 500KΩ (single side);
▲ A/D conversion: 24 bits;
▲ Dynamic range: ≥135dB@ sampling rate of 50Hz;
▲ Zero input noise <2μV (±20V range)
▲Nonlinear distortion: <-110dB@ Sampling rate is 50Hz;
▲ Crosstalk/passband fluctuation: <-110dB/0.1dB;
▲Out-of-band attenuation:>135dB;
▲Digital filter: FIR digital filter, which can be set for linear phase shift and minimum phase shift;
▲ Output sampling rate: 1,10,20,50,100,200,500,1000,2000Hz;
▲Multiple sampling rate output: each channel supports multiple sampling rate data output at the same time;
▲Minimum output interval of real-time data: 10 sampling points/bag (low-latency realtime data is provided for earthquake early warning service);
▲Qualcomm filter: DC, 10,30,100,300,1000,3000S;
▲Analog signal generator: 16-bit DAC, programmed waveform output, ±20mA;
▲Loop self-test: The analog channel input can be programmed to connect to the calibration output or signal ground;
▲The calibration signal type: square wave, sine wave, pseudo-random binary code signal frequency, amplitude and period can be set;
▲Local record format: EVT, optional compressed format, support Mini SEED format;
▲ Recording function: supports simultaneous recording of continuous data and triggered event data;
Pre-signal acquisition channel
▲Input signal full value: ±10V, doubleended balanced differential input;
▲Input impedance: 1MΩ (single side);
▲A/D conversion: 24 bits;
▲Dynamic range:>135dB@ Sampling rate: 1 Hz; Real-time data output interval: 1 second;
▲Local record format: compressed format or precursor instrument data format;
Frequency measurement channel
▲Measurement range/measurement acc-uracy: 10Hz~ 200KHz/output data*10-6;
▲Resolution/ input impedance: 5*10-7/1MΩ;
▲Local record format: compressed format or precursor instrument data format;
▲ Real-time data output interval: 1 second;
▲Output dimension: Hz;
▲Stability of the base during measurement:10⁸, when GNSS module is synchronized;
▲Timing accuracy: When the GNSS module is synchronized, the clock accuracy is less than 0.1ms;
▲Timing input: IRIG-B code time signal, supporting GPS and Beidou timing system;
▲Attachment GNSS module: output IRIGB code time signal; communication
▲Communication interface: two RS232C serial ports, one standard 10M/100M Ethernet card;
▲ Communication protocol: support TCP/IP, FTP, Telnet, HTTP and so on;
