The Distributed DAQlink 4 System is the combination of a standard DAQlink 4 seismograph and internal, high-speed, network extenders. Using inexpensive twisted pair telephone cable, these network extenders will send triggering times and receive seismic data from other DAQlinks. These cable links can send reach 10,000 ft, or three kilometers in length.

The entire system is connected to a computer which controls the seismograph network and stores the acquired seismic data. This computer can be simultaneously providing Quality Control as the project is acquired. The final data files can be stored in SEG‑2, SEG‑D, SEG-Y, ASCII or MiniSEED format.

System Features:

Cutting-Edge Performance

1 to 24 channels per seismograph node

High-Speed 24bit ADC – up to 64,000 sps

Wide Bandwidth – DC to 32 KHz (unfiltered)

Low Distortion – 0.00006% THD @ 500 sps

Wide Dynamic Range – > 144 dB (system) and >124 dB (measured) @ 500 sps

Low Noise – less 0.15 µV RMS @ 500 sps

Multiple Time Synchronization Modes

GPS Clock Discipline for Autonomous Recording

VHF/UHF Radio for Underground Use

Or synchronize multiple DAQlink via cable

Multiple Trigger Modes

Trigger on hammer switch for shot acquisition

Trigger using GPS time for noise monitoring

Two trigger circuits available, one for standard and a second for low-voltage inputs

Multiple Data Storage Methods

Built-in Ethernet Network

Built-in Acceptance Testing

Operation Modes:

Operate as Stand-Alone Seismograph

Use a sledgehammer and hammer switch

Small, lightweight unit for small, fast crews

Operate as an Acquisition System

Use a vibrator and Force 3 controller

Network a computer to Monitor Acquisition,
Quality Control Data, and Store Shot Records

Passive Monitoring

True Continuous Recording

Use Cellular Modem for Remote Data Collection

Works with surface or downhole sensors

Automated Event Detection

Distributed DAQlink 4 with Built-In Network Extender Features:

High-speed time break, system status and data transfer

Uses inexpensive twisted pair telephone cable

Simple setup and configuration

Allows seismograph spacing of 10,000 ft, 1.9 miles or 3 kilometers

Standard DAQlink 4 Seismograph
with standard top-mounted connectors

Vibrators or Impulse Sources

Other DAQlink 4 Connection Options:

Besides the Network Extender option, seismograph networks can be constructed using the 100Base-T network

Cable Solution - 100 meters maximum between network switches

WiFi solution - typical line of sight or 1 Km with 900 MHz units (distance depends on environment)

Cellular Data Modem Solution – Connect each DAQlink4, or the entire DAQlink 4 system, to a cellular data modem and download data from anywhere via the Internet

Distributed DAQlink 4 Trigger Options:

Cabled solution - wired trigger signal is connected to each DAQlink unit

VHF Radio solution - Wireless Trigger box is connected to each unit - Trigger signal is sent via VHF radio

GPS solution - if all DAQlinks units have GPS synchronization, then the triggering will be synchronized via the GPS time. Only one DAQlink needs to be wired to the trigger signal. The other DAQlinks will start at correct GPS time via Ethernet commands from the Vscope software.

Trigger Storage - with the DAQlinks continuously recording with GPS synchronization, store the GPS trigger times at the Source Points and Post process Shot Records.

Downhole Recording

MegaDAQ - Multiple DAQlink 4 Seismographs
in a single chassis 

All connectors have been relocated to the side of the case, enabling DAQlinks to be stacked.

With the connectors centralized, cable runs are shorter and easier to maintain.

With the seismograph modules in a central location, they can be networked for real-time data.

MegaDAQ configurations utilize a single GPS module for consistent timing.

The MegaDAQ configuration packs the largest number of channels into the minimum amount of space.