Why doesn't the SDM8X50 make a clicking sound?

The hermetically sealed relays used in the SDM8X50 are much quieter than the relays used with the retired SDMX50-series multiplexers. Although listening for the clicking on the SDMX50-series multiplexers was a common method to verify that the multiplexer was powered and communicating with the data logger, that test does not work for the SDM8X50.

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