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Data analysis
software verification Benchmark 1 Function of test
The function of
this test is to check the ability of the analysis package to import and convert
the supplied ASCII data into engineering form ready for the computation of the
following basic signal statistics: Maximum signal level Minimum signal level Mean level Standard deviation Root mean square Test Group A Signal Details
The data are
integers simulating an Analogue to Digital Converter (ADC) output. The data are
constrained to lie in the range –32767 to +32767 and the intended full scale
range of the ADC is +/-10 Volts. For each of the signals three files are
supplied simulating output from 12, 14 and 16 bit ADCs. In all cases the full
range equivalent value for a 10 Volt input will be 32768. Twenty-four
files in eight subsections are supplied for this test group. All files have the names starting with EIS_DATA_ followed by: A_1_12bit.TXT ) A_2_12bit.TXT ) A_3_12bit.TXT ) A_4_12bit.TXT ) A_5_12bit.TXT ) A_6_12bit.TXT ) A_7_12bit.TXT ) A_8_12bit.TXT ) Analysis parameters to be used
The data is
supplied in ASCII form and each file represents one signal. When loaded into an
analysis package the data should be set to a sample rate of 250 samples per
second. To be
representative of normally acquired data the signals should be scaled to
represent a full-scale value of 10.0 Volts (i.e. the supplied numbers should be
divided by 3276.8) In each case
the analysis should be performed on the entire signal. Reference results
The design case
for the signals is: 7.5126 Volts for the positive
signals -7.4873 Volts for the negative signals Based on the
above the above the reference analysis results should be as shown in Table 1.
Table 1. Reference
results for Group A signals. Acceptable tolerance in
computed results
The tolerance
on the results of the specified analyses should be no more than the equivalent of
+/- 1 ADC level.
Table 2. Permitted
tolerances Typical erroneous results and
their causes
If good
agreement with the reference results is obtained for the short signals and poor
results for the long signals the most likely cause is the use of single
precision floating point computation for both cases instead of double
precision. Results return documents.
In order to aid
the working party in the development of benchmark data users are invited to
submit the results obtained when employing the tests. These submissions will be
assessed by the working party and summaries may be used in presentations and
publications of the working party’s activities. If you wish to
submit results please use the document contained in Appendix A. Issue 2 08/08/2003 © Engineering
Integrity Society 2002 Appendix A Analysis
results return. Name: - Organisation:
- Date: -
Address: -
Email: - Tel:
- Fax: - Analysis Package used: - Version:
- Computer Hardware and operating system details Processor: - Speed:
- Memory
size: - Mb Operating System: - Version:
-
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