Test Equipment Notes
===

Buses are a harsh environment both physically and electrically.
In order to make sure electronic components are ruggedized against
the environment they'll be put in, this document collects different
resources on test equipment and notes on testing.

RF Spectrum Analyzer
---

[HackRF](https://github.com/mossmann/hackrf) along with software that does [spectrum analysis](https://github.com/pavsa/hackrf-spectrum-analyzer)
looks to be a good reasonably priced and open source hardware solution.

Audio Analyzer
---

[Spek](https://github.com/alexkay/spek) looks to be a nice FOSS front end for audio spectrum analysis.

We probably only want decibel measurements to determine what loudness the DIU and other speaker elements should be.

I have used a cheap [BAFX3370](https://www.amazon.com/BAFX-Products-Pressure-30-130dBA-Warranty/dp/B00ECCZWWI) decibel
meter to get some rough measurements.
Ideally there would be a microphone or other decibel monitoring device on the bus to get a better reading.

Test Fixture
---

To simulate the vibration of the bus, a suitable [test fixture](https://en.wikipedia.org/wiki/Test_fixture) should be developed.

At a minimum, the sway and resonance of the fixture should be variable to test how well the assembly is against vibration that
can occur on the bus.