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. 2017 Jul 31;7:6855. doi: 10.1038/s41598-017-06926-1

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The effect of environmental factor on measured data. (a) The variation in S₂₁ and temperature for a 20 dB attenuator recorded over a two days period. (b) The effects of vibration (movement) on the S₂₁ through a 3-1-3 tank using phase-stable cables. The curves have been offset from the original values in the S₂₁ axes to better illustrate the errors introduced. Steady state 1 and 2 means measurement before and after vibration.