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A moisture sensing unit (30, FIG. 1 or 58, FIG. 4) is included within a hermetically sealed package. A localized external portion of the package in close proximity to the unit is cooled while the temperature and the alternating-current capacitance and/or conductance characteristic of the unit are me

A moisture sensing unit (30, FIG. 1 or 58, FIG. 4) is included within a hermetically sealed package. A localized external portion of the package in close proximity to the unit is cooled while the temperature and the alternating-current capacitance and/or conductance characteristic of the unit are measured. The measured characteristic exhibits a sharp increase at the temperature corresponding to the dew point of the atmosphere within the package. In turn, the dew point temperature is a direct indicator of the moisture content of the package.

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An electrical assembly comprising a housing (52, FIG. 4), an interior sealed compartment (54, FIG. 4) defined by said housing, plural conductive elements (17 through 22 . . . 35 through 40, FIG. 1) mounted in said housing, each of said elements having an interior end extending into said compartment

An electrical assembly comprising a housing (52, FIG. 4), an interior sealed compartment (54, FIG. 4) defined by said housing, plural conductive elements (17 through 22 . . . 35 through 40, FIG. 1) mounted in said housing, each of said elements having an interior end extending into said compartment and an exterior end extending outside of said housing, and a moisture sensing unit (30, FIG. 1 or 58, FIG. 4) mounted in said compartment, said assembly being CHARACTERIZED IN THAT said housing includes an exterior recess (50, FIG. 3 or 60, FIG. 4) in close proximity to and in aligned registry with said unit, said recess being adapted to receive therein a cooling head (62, FIG. 4).