STRATAVIEW ™

Reflection/Refraction Seismograph

Features

Ideal for reflection, refraction, marine, VSP and tomography surveys.
Built-in interpretation software calculates geologic cross section from refraction data.
Built-in high-speed hardware correlator for efficient vibrator and mini-sosie surveys.
Line, geophone and instrument tests.
Light weight and low power.
Allows easy expansion, 12 to 600 channels with Aux.
12 to 72 channel portable.
12 to 132 channel rack mount.
Networkable to 600 channels.
Optional Windows NT-based PC controller for high cycle time applications: marine, land and tomography.

General

The StrataView is the first seismic recorder flexible enough to meet the changing needs of exploration, research and geotechnical studies - you may never need another seismic recorder! StrataViews are light and portable when you need to do a refraction job. StrataViews plug together easily to build larger systems for 2-D and 3-D reflection surveys with vibrators or impulsive sources. And the fast cycle times and wide bandwidth combine for the preferred choice for marine, VSP and tomography surveys.

The StrataView comes with the easiest-to-use software in the business. A menu bar and simple pull down windows let you quickly configure the system and start collecting data.

StrataView seismographs are carefully engineered to provide performance unmatched in other systems. After digital conversion of the geophone signals, data is streamed into digital signal processing chips (DSP's). These specialized CPU's perform low cut, high cut, notch filtering and correlation in a fraction of the time required by Pentium type processors. DSP chips run cool and use little power, extending the operating temperature of the StrataView beyond any similar system.

Refraction Surveys

StrataView software helps you pick first arrivals and plot travel time curves in the field. On screen layer assignment lets you process data while waiting for the next shot.

The StrataView software will even analyze your data and print out a seismic cross section while still on site.

Reflection Surveys

Use the StrataView for shallow high resolution reflection surveys, deep petroleum studies using explosives - even 3-D vibrator surveys. Turnkey systems are available with roll along switches, radio blasters, geophones and energy sources for any kind of survey.

Marine Surveys

When combined with the Windows NT Marine Controller, the StrataView boasts cycle times of under 0.5 second, write to tape in real time - even provides on line QC features.

VSP, Tomography and Downhole Surveys

High cycle times and wide band width provide high resolution and time efficient data collection.

RX Series High Dynamic Range Configuration

The RX series instruments are the highest dynamic range and lowest distortion true 24 bit recorders made. Sigma-Delta A/D converters by Crystal Semiconductor provide 0.3 to 1.7 kHz bandwidth. The RX offers extra long record lengths, built-in line testing and real time correlation for efficient surveys.

R Series High Resolution Configuration

For those requiring ultra-high resolution and sampling, the R series system offers among the highest bandwidth in the industry - 14 kHz at 32 microsecond sampling. Unique oversampling and anti-alias filters still provide 113 dB measured dynamic range. The R series instruments offer excellent value for cost sensitive applications.

Instrument and Geophone Tests

Both the R and RX series instruments can be tested using precision oscillators. Built-in software performs daily and monthly tests suites or can be custom configured.

The RX series instruments are capable of checking cable and geophone performance.

Configurations

All StrataView seismograph modules come with a large daylight-visible LCD screen, built-in printer, internal hard drive data storage and SCSI tape port. Data storage in SEG-2, SEG-Y and SEG-D is available. Systems can be configured as follows:

Stand-alone weather proof 12V portable module, 12 to 72 channels.
Stand-alone rack mount 110/220V module, 12 to 132 channels (RX series only).
Two or more StrataView modules connected together with StrataLink network. All operations from one keypad.
One or more StrataView modules connected to the CNT Windows NT PC controller for marine, land, VSP or tomography applications.

Specifications

A/D Conversion:

R Series: 24 bit A/D process using 32 kHz over sampling, digital anti-alias and decimation to user selected sample rate.
RX Series: 24 bit A/D conversion using Crystal Semiconductor sigmadelta 2nd generation converters.
Dynamic Range:
R Series: 138 dB theoretical, 113 dB measured @ 2ms, 3 to 150Hz
RX Series: 144 dB theoretical, 125 dB (instantaneous measured). @ 2ms, 0 dB
Distortion:
R Series: 0.005% @ 2ms, 3 to 150Hz
RX Series: 0.0003% @ 2ms, 0.3 to 206Hz
Bandwidth:
R Series: 3.0 to 14kHz, < 1Hz optional
RX Series: 0.3 to 1.7kHz

Common Mode Rejection:

R Series: >-90 dB @ < 100Hz
RX Series: >-110 dB @ <100Hz, 48 dB pre-
amplifier gain

Crosstalk:

R Series: -85 dB @ 24Hz
RX Series: >-120 dB @ 100Hz, 0 dB

Noise Floor:

R Series: 0.25 µV, RFI @ 2ms, 3 to 150Hz
RX Series: 0.18 µV, RFI @ 2ms, 3 to 206 HZ,
48 dB

Trigger Accuracy:

R Series: 1 microsecond
RX Series: 1/128 of sample interval

Maximum Input Signal:

R Series: 300mV, P-P
RX Series: 10V, P-P
Input Impedance: 20 KOhm, 0.02 µf.
Preamplifier Gains:
R Series: 36 dB, followed by 24 dB floating point amplifier
RX Series: 0,24,36 and 48 d
Pretrigger Data: Up to 4096 samples
Stacker: full 32-Bit

Anti-alais Filters:

R-Series: Digital, automatically selected to correspond to sample rate. -3 dB corner frequency, down 80 dB at Nyquist, except -74 dB when sampling at 16KHz and none at 32Khz.
RX Series: 82% of Nyquist, down 130 dB.

Acquisition and Display Filters:

Low Cut: OUT, 10, 15, 25, 35, 50, 70, 100, 140, 200, 280, 400Hz, 24 or 48 dB/octave, Butterworth
Notch: 50, 60, 150, 180Hz and OUT, with the 50 dB rejection bandwidth 2% of center frequency.
High Cut: OUT, 250, 500, or 1000Hz, 24 or 48 dB/octave
Custom frequencies available. Display filters do not affect data.

Sample Interval:

R Series: 0.032, 0.064, 0.128, 0.25, 0.5, 1.0, 2.0ms
RX Series: 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 16.0ms

Record Lengths:

R Series: 24,000 samples per channel for 12 or 24 channels, 12,000 for 36 channels
RX Series: 16,000 samples/channel standard, 64,000 optional, independent of the number of channels
Correlator: Hardware full precision correlator. Operates either before or after stack.
Automatic Gain Control: Digital AGC with user adjustable window. Display only - does not affect raw data
Roll Along: Any number of channels rolled through existing channels.
Number of Channels: 12 to 72 channels per 12V portable module, 12 to 132 channels per rack mount module, RX series only. Modules stackable to form systems of up to 600 channels, controlled internally from 1 keypad or externally by a PC based computer.

Line Testing:

R Series: Real-time full waveform noise monitor
RX Series: Real-time full waveform noise monitor, geophone pulse locates dead or out of spec geophones, continuity
Display: Large, daylight visible VGA compatible with 15 x 20cm viewing area, backlit for night operation. External controllers available with up to 1024 x 1280 color or B&W displays.
External Controller: PC based NT controllers for land, marine, VSP and tomography operations. Ask for separate data sheet.
Data Formats: SEG-2, SEG-D and SEG-Y depending on configuration
Data Storage: Internal hard drive or DAT, DLT, Exabyte, 3480, 3490, 3590 or other external SCSI device.
Plotter: Four inch (11cm) wide built in plotter, or other external wide carriage plotter.
Triggering: Positive, negative or contact closure, software adjustable threshold.
Delay: 0 to 9999ms in 1 ms increments
Survey Geometry: Stores user definable shot, geophone locations using flexible coordinate system

Power Consumption:

R Series: 30W plus 1.0W per channel.
RX Series: 38W plus 0.8W per channel
Environmental: -10° to +40°C. Operates in light rain
Connectors: NK-27-21C for 12 and 24 channels, Bendix 61P connectors for larger surveys

Standard Components

StrataViewT module complete with daylight-visible LCD screen, built-in printer, internal hard drive data storage, SCSI tape port and manual.

Order Information

Description		Order Number
StrataView R12		530-325-0320
StrataView R24		530-325-0330
StrataView R48		530-325-0350
StrataView R60		530-320-0360
StrataView R72		530-325-0370
StrataView RX12		530-325-0380
StrataView RX24		530-325-0390
StrataView RX48		530-325-0400
StrataView RX60		530-325-0410
StrataView RX72		530-325-0420

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