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+Test Equipment Notes
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+===
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+
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+Buses are a harsh environment both physically and electrically.
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+In order to make sure electronic components are ruggedized against
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+the environment they'll be put in, this document collects different
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+resources on test equipment and notes on testing.
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+
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+RF Spectrum Analyzer
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+---
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+
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+[HackRF](https://github.com/mossmann/hackrf) along with software that does [spectrum analysis](https://github.com/pavsa/hackrf-spectrum-analyzer)
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+looks to be a good reasonably priced and open source hardware solution.
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+
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+Audio Analyzer
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+---
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+
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+[Spek](https://github.com/alexkay/spek) looks to be a nice FOSS front end for audio spectrum analysis.
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+
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+We probably only want decibel measurements to determine what loudness the DIU and other speaker elements should be.
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+
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+I have used a cheap [BAFX3370](https://www.amazon.com/BAFX-Products-Pressure-30-130dBA-Warranty/dp/B00ECCZWWI) decibel
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+meter to get some rough measurements.
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+Ideally there would be a microphone or other decibel monitoring device on the bus to get a better reading.
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+
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+Test Fixture
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+---
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+
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+To simulate the vibration of the bus, a suitable [test fixture](https://en.wikipedia.org/wiki/Test_fixture) should be developed.
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+
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+At a minimum, the sway and resonance of the fixture should be variable to test how well the assembly is against vibration that
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+can occur on the bus.
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+
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abetusk