Measure with an ohmmeter between each pin and case. If one is connected to the case, that is ground (shield). If neither is, it doesn't matter.
Other than that, there is no "polarity" since they have no DC applied to them (note that).
Measure with an ohmmeter between each pin and case. If one is connected to the case, that is ground (shield). If neither is, it doesn't matter.
Other than that, there is no "polarity" since they have no DC applied to them (note that).