Thermometer Failures

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One of our most serious concerns came from two thermometer failures during the summer, one of which (370008008D4EB610) failed in the middle of the night while being read:

Shown below are the waveforms from:

The Dallas 1-wire thermometers were being read using a DS9490R adapter. The thermometer is using external power from the adapter. For this test, devices were repeatedly sent:

The flexible speed setting was chosen to match the timing of regular speed operation as well as possible; the settings chosen were: