Appendix 2 Study of Acoustic Interference - Report B179CR1
A Study of the Susceptibility of Animal Tag Reading RFID Equipment to Interference from Acoustic Signals Present in the Abattoir and Auction Market Environments
Contents
List of terms and abbreviations
Executive summary
1 Introduction
1.1 Background
1.2 Test samples
1.3 Test methodology
2 Preliminary investigations and on-site measurements
2.1 Test Equipment
2.2 Choice of Test Locations
2.3 Locations and Measurement Dates
3 Analysis of site data
3.1 Frequency Domain Analysis
3.1.1 Typical Peak Sound Levels
3.1.2 Conclusion
3.2 Time Domain Analysis
4 Design of an acoustic immunity test facility
4.1 Frequency Range And Stimulus Levels
4.1.1 Frequency domain
4.1.2 Time domain
4.2 Interfering Signal Duration
4.3 Defining the Degradation of Performance of the Test Samples
4.4 Test Equipment
5 Acoustic immunity test results
5.1 Frequency Domain
5.2 Time Domain
5.3 Summary of immunity testing
5.3.1 Results of Sample 1
5.3.2 Results of Sample 2
5.3.3 Results of Sample 3
5.3.4 Results of Sample 4
5.4 General Conclusions
Conclusions
References
List of Tables
Table 1: Stimulus levels to be applied for acoustic immunity testing
Table 2: Immunity test levels
Table 3: Results - 400Hz to 5kHz
Table 4: Results -5kHz to 10kHz
Table 5: Results -10kHz to 50kHz
Table 6: Results -50kHz to 80kHz
Table 7: Results -Composite interfering signal
Table 8: Further results - sample 3
List of Figures
Figure 1: Site data collection at the Stirling Auction Market
Figure 2: Data collection at the Thainstone Centre - Inverurie
Figure 3: Typical graphical output provided by the HP3561A instrument
Figure 4: Measurement using the HP3561A instrument at the Scotbeef site
Figure 5: Measurement using the HP3561A instrument at the Scotbeef site
Figure 6: Combined responses of cattle measurements made at the Scotbeef site
Figure 7: A measurement at the sheep run at the Scotbeef site
Figure 8: A further measurement at the sheep run at the Scotbeef site
Figure 9: Combined responses of sheep measurements made at the Scotbeef site
Figure 10: Measurement using the HP3561A instrument at the United Auctions site
Figure 11: Measurement using the HP3561A instrument at the United Auctions site
Figure 12: Combined responses of measurements made at the United Auctions site
Figure 13: Measurement using the HP3561A instrument at the McIntosh Donald site
Figure 14: Measurement using the HP3561A instrument at the McIntosh Donald site
Figure 15: Combined responses of measurements made at the McIntosh Donald site
Figure 16: Measurement using the HP3561A instrument at the Thainstone Centre
Figure 17: Measurement using the HP3561A instrument at the Thainstone Centre
Figure 18: Combined responses of measurements made at the Thainstone Centre
Figure 19: Combined responses of measurements made at all the sites
Figure 20: Combined responses and the stimulus level for test system
Figure 21: Typical sound timeline (Thainstone Auction market at Inverurie)
Figure 22: Detailed sound timeline of gate being slammed shut
Figure 24: Further sound timeline of a gate being slammed shut
Figure 25: Repeated and condensed timeline of a gate being slammed shut
Figure 26: Immunity test system (test object masked out)
Figure 27: Plan view of the test setup