Seismic Source Co

Products

High Resolution Seismic Recording System

with High Speed, Compact Size & Low Power

DAQlink4 is the fourth generation of portable seismograph systems. It can be configured as a stand-alone monitoring system, a refraction system or a distributed seismic reflection system.

Vscope software controls the seismograph, providing acquisition control, data QC and file storage. This seismograph utilizes industry standard Ethernet for command, control, and fast data file transfer.

	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 27 KHz
	Low Distortion – 0.00008% THD @ 500 sps
	Wide Dynamic Range – >125 dB @ 500 sps
	Low Noise – less 0.2 µV RMS @ 500 sps
	Multiple Time Synchronization Modes
	GPS Clock Discipline for Autonomous Recording
	VHF/UHF Radio for Underground Use
	Multiple Trigger Modes
	Trigger on hammer switch for shot acquisition
	Trigger using GPS time for noise monitoring
	Trigger using LTA and STA for event monitoring
	Two trigger circuits available, one for standard and a second for low-voltage inputs
	Multiple Data Storage Methods
	16 Gbytes internal memory card standard
	External mounted, USB-compatible Memory Plug for data backup and transfer
	Ethernet connection for fast data transfers and remote data storage
	Built-in Ethernet Network
	Use network to configure seismograph and monitor acquisition
	Compatible with cables, Wi-Fi and Cellular Data
	Internal FTP server for external data access
	Built-in Acceptance Testing
	Instrument Tests:
	Distortion, Cross-feed, CMRR, Impulse & Noise
	Sensor Tests:
	Resistance, Frequency, Damping, Sensitivity

DAQlink4

daq4 24d

24 Channel Seismograph

	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
	Continuously record and store data
	Use LTA (Long Term Average) or STA (Short Term Average) to detect events
	Includes automatic email notifications as events are located

distributed daqlink4

Multiple Node System

daqlink4

Downhole Data Acquisition

Distributed DAQlink4 System

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 trig-gering 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 con-trols the seismograph network and stores the acquired seismic data. This computer can be simultaneously providing Quality Control as the project is acquired. Seismic data can be stored in Raw (*.dat), SEG‑2 (*.sg2), SEG‑D (*.sgd), SEG-Y (*.sgy), or ASCII (8.csv), MiniSEED formats.

daq4 24d

Distributed DAQlink 4

daqlink4

Large Projects

daqlink4

Small Crews

Distributed Connection Options

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 DAQlink 4, or the entire DAQlink 4 system, to a cellular data modem and download data from anywhere via the Internet.

Expandability and Flexibility

All DAQlink4 seismographs are compatible with the entire line of Seismic Source Co source control electronics. This includes the Force3 Vibroseis controller, the Boom Box 3 dynamite synchronizer and the RTM3 remote trigger module. DAQlink nodes are also compatible with the Universal Encoder 2. Use the UE2 for precise source operation.

Includes VibraScope Software:

distributed daqlink4

	Functions:
	Configures DAQlink4 for Acquisition
	Monitors Seismograph Operation
	Offloads and Evaluates Data
	Features:
	Data Display
	Analysis – Amplitude & Phase Spectra
	RMS Noise and Signal Graphs
	Expansion:
	For larger systems, DAQlink4 seismographs are compatible with the full line of iSeis Sigma Field Software, including SourceLink & Sigma Observer.

DAQlink4 Features and Specifications:

Technical Features:

	A/D Conversion:		24-bit, high-speed, delta-sigma converters
	Dynamic Range:		Greater than 125 dB (measured @ 500 sps)
	Crossfeed:		Better than 125 dB (measured @ 500 sps)
	Common Mode Rejection:		Better than 100 dB (measured @ 500 sps)
	Total Harmonic Distortion		Better than 0.00006% (measured @ 500 sps)
	Noise Floor:		0.15 mV RMS (measured @ 500 sps)
	Bandwidth:		0 to 32 KHz (unfiltered)
	Preamp Gain (User Selectable):		x1 (0 dB), x4 (12 dB) & x16 (24 dB)
	Maximum Input Signal:		x1 gain - 6.5 Volts peak to peak
	Input Impedance:		100k Ohms
	Digital Filter (User Selectable):		Low-Cut Filter - Disabled, 0.001-120 Hz Filter Type - Linear or Minimum Phase
	Anti-Alias Filter:		85% of the Nyquist frequency
	Sampling Interval::		0.0156, 0.0313, 0.0625, 0.125, 0.250, 0.500, 1.00, 2.00, 4.00, & 8.00 milliseconds
	Sampling Rate::		64,000, 32,000; 16,000, 8000, 4000, 2000, 1000, 500, 250, & 125 sps
	Record Length:		Unlimited (with Continuous Recording)
	Record Modes:		DAQlink (Triggered by External Event) Sigma (Continuous Recording)
	Trigger Accuracy::		±1 microsecond at any sampling frequency
	Pre-Trigger Delay:		Up to 32 seconds
	Post-Trigger Delay:		Up to 100 seconds

Physical features:

	Internal Network:		100-BaseT Ethernet Includes real-time data transfer
	Internal CF-Card Memory:		16 Gbytes Standard (can be expanded)
	GPS Interface Standard		Internal Clock synchronized to GPS time GPS Time and Position saved with data
	Optional External Removable Memory:		32 Gbytes (can be expanded)
	Power Consumption (24 channels):		Less than 0.12 watts/channel
	Power Requirements:		9 to 27 VDC
	Included Tests:		Internal tests for verification of the instrument and the geophone spread
	Dimensions:		Dimensions: ..... 280 x 246 x 56 mm (11.0 x 9.7 x 2.2 inches) Weight: .............. 2.0 kg (4.4 pounds)
	Operating Temperature:		-40° to 85° C
	Case:		Sturdy Milled Aluminum Weatherproof seal - IP67

A complete DAQlink 4 Field System typically includes the following:

	1 ... DAQlink 4 Seismograph
	1 ... ........ Power Cable
	1 ... ........ Ethernet Data Cable
	1 ... ........ Trigger Port Cable
	1 ... Hammer Switch with Extender Cable
	1 ... “Y” Cable (for connecting to spread)
	2 ... 12 Channel Spread Cables
	24. Geophones (customer selects frequencies)
	12V Battery (customer provided)

Downloads:

		Download DAQLink 4 Brochure
		Download DAQLink 4 Marine Acquisition Brochure
		Download DAQLink 4 MASW Brochure

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