TTS2+ Digital Recorder

This is our current recorder, with units in use worldwide. The analog units are similar to the well proven TTS2, but with a completely new fully integrated digital unit. This unit contains four parallel processors, to give no-compromise performance with great versatility.

For example it will record 240 channels at 1ms. with no delay between records, and display all channels on screen each shot.

Its features have been designed to improve its versatility and ease of use, and to support the requirements of a particular customer. Like its predecessor, it has become renowned for its reliability under all conditions.

On this page:
Key Features • Brief Specifications

Downloadable Documentation (in Adobe Acrobat PDF format):
Operator Manual 1798K • Manufacturer Full Specifications 45K

TTS2+ Key Features include:

• Optimised for high resolution surveys - Zero dead time between shots for any configuration.
  
  
• Up to 240 seismic channels.
  
  
• ¼ ms. to 2ms. sample rates
  
  
• Highly integrated, VME based multi-processor controller for performance and reliability.
  
  
• True pre-emptive multi-tasking real time operating system controls all data handling
  
  
• Windows NT© based GUI, for ease of interfacing and third party support.
  
  
• Crystal 24 bit Sigma-Delta seismic ADC's on all channels, give 120 dB dynamic range.
  
  
• Dual SCSI bus, up to 6 recording devices can be on-line, with automatic changeover.
  
  
• Analog multiplexed output and single trace gather.
  
  
• Project based software allows rapid configuration and reconfiguration.
  
  
• Every seismic channel data can be displayed every shot, on a high resolution video screen - even up to 240 channels.
  
  
• High speed, hard copy output.
  
  
• On-screen and automatic archive filing of all devices, gives both instant and post-processed logging and QC.
  
  
• Simple and reliable software upgrades, with single executable file of less than 1 Megabyte - can be done by e-mail.
  
  
• Support for all popular 'bird' controllers and source controllers.
  
  
• Automatic and manual integrated system test and analysis.
  
  
• Automated cable tester, with capacitance measurement.
  
  
• Interfaces with direct, pre-amplified and transformer coupled streamers.
  
  
• Unrivalled hardware and software support, direct from our workshop
  
  
• No agents, all systems are installed by our own engineers.
  
  
• Approved by all major oil companies.

TTS2+ Brief Specifications:

Electrical:

Analog to Digital Conversion
Type: Delta-sigma
Make/Model: Crystal Semiconductor 5321/5322
Resolution: 24bits
Converters per channel: 1

Maximum Channels per Sample Rate
240 @ 2ms.
240 @ 1ms.
120 @ 1/2ms.
48 @ 1/4ms.

Channel Programming
Minimum number: 12
Channel selection multiple: 4
Channels per analog module: 64
Auxiliary channels: 0 or 4

Average instantaneous dynamic range
116dB @ 24dB fixed gain, 1ms. sample rate

Input characteristics
Transformerless, instrumentation amplifier, Varistor protected
Input impedance 1M*.

Maximum input signal
580mV. rms @ 24dB K gain.

Equivalent input noise
(source resistance 2,000*)
typically, 0.7uV @ 1ms and 24dB K gain

Common mode rejection
Better than 90dB @ 50Hz. 2V.

Overall fixed gain
Base gain of 24dB or 30dB.
Software adjustable from +0 to +24dB., in steps of 6dB.

Interchannel Crossfeed
Less than -90dB at full scale input.

Total Harmonic Distortion
Typically 0.002% @ 24dB, 7.8Hz, full scale -6dB

Low Cut filter
Type: analog, Butterworth
Slope: 18dB/octave.
Selection: software, 4 fixed frequencies.
Frequency: programmable by plug-in module.
Filter out: 6dB @ lowest filter program.

Anti-alias Filter
Type: digital, FIR, linear phase
Stop band attenuation: 130dB min.
Cut-off frequencies:
205Hz. @ 2ms.
411Hz. @ 1ms.
825Hz. @ 1/2ms.
1650Hz. @1/4ms.
System Master Clock
Frequency: 1.024Mhz.
Tolerance: < 10ppm.

Digital Data Formats - SEGD
8058 - 32bit IEEE demultiplexed
8015 - 20bit demultiplexed

Record Length
Minimum length: 96ms.
Selection interval: 4 samples.
Maximum length: depends on channels/sample rate, no limits on typical operation - >20s @ 120 channels 1ms.

Tape Interface
Type: SCSI-2 (8bit)
Media: 3490E
DAT

QC Features:

Test generator (internal)
Sinewave: 18 levels: 512mV to 1 uV in 6dB steps
8 frequencies:7.8Hz to 1000Hz.
Distortion: <0.002%
Pulse: positive, negative, to SEG specs.
Terminated inputs.

Cable Testing (integral)
Impulse test with transducer connected.
Continuity, Leakage, Capacitance, Manual and Auto modes.

VDU monitor
Raster scan of seis channels
Analysis of test records by histogram and table.

Near trace gather (profiler)
Select any channel
Compressed analog output with trigger
Fixed output data stream, sample rate independent.

Oscilloscope monitor
Realtime multiplexed analog output, from each analog box, or all channels.