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QA / QC Testif-I 

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TESTIF-I

Overview

TESTIF-I, is a field-based Technical Audit service developed by Verif-I Ltd., UK, and offered by The Vision Group, which comprises software to test seismic instruments, and hardware to test geophones, and vibroseis electronics, and performance (see Sandwich box description later in this section).

The Testif-I instrument and source test analysis software is a Windows 95/98/NT/2000 or Linux (Red Hat 7.2 ) based test analysis system for processing both modern and legacy recording system instrument and source tests. Due to very efficient design, large channel sets can be processed on even low to medium specification computers. 

Data tapes in most recognized SEG D or SEC Y formats are easily read into the system where the data format is automatically identified and decoded. To ensure the tape header is correct it can be checked using a detailed header annotation. The complete data file format can be examined with a hex viewer. 

Channels can be viewed as a group with a complete camera type display or channels can be viewed on an individual basis.

Source test analysis is provided for vibrators and receiver response tests are analysed using hydrophone sensitivity and receiver step impulse analysis utilities.

Data Input

  • SEG D or SEG Y SCSI tape reading using Windows ASPI or Linux SCSI control

  • SEG D or SEG Y file input via network or removable media e.g. CD

  • The SCSI tape read module proven with 3480/3490,3590,9 track, DAT and Exabyte

Data Examination

  • Annotated SEG D and SEG Y tape header

  • Hex file viewer

  • Tape and disk file record listing

  • Camera display

  • Trace plot

  •  Spectral analysis of multiple channels/samples

 Mathematical Operations

  • Correlation

  • Summation, subtraction

  • Multiplication, division

Instrument test analysis routines include

  • Noise and offset (time and frequency domain)

  • Distortion

  • Dynamic Range (time and frequency domain)

  • Gain Accuracy (time and frequency domain)

  • Common mode rejection ratio (CMRR) (time and frequency domain)

  • Impulse analysis amplitude and phase (time and frequency domain)

  • Crossfeed analysis including Nessie, Sercel 408, 358,338 versions (time and frequency domain)

  • IFP test analysis for older systems

Source/receiver analysis

  • Multi-vibrator hardwire similarities

  • Automatic calculation of start time errors

  • Hydrophone sensitivity frequency domain calculation

  • Receiver step impulse analysis

Output

  • Graphical results to printer under Windows

  • Graphical results to file as bmp, png or jpg

  • Tabular results output to disk

Other features

  • Error flagging of peg and ground electronics serial numbers on failure list (Q, FRS, 388,408 only)

  • Display of ground electronics performance over time (Q, FRS, 388, 408 only)