HMC-C011 Short Circuit and Output

The metal enclosure of my HMC-C011 has the same voltage as pin 4 (Vdc). I checked the soldering to ensure no unwarranted external connections between the lead and the gold plate.Is the device designed so that the metal enclosure has is connected to Vdc? If not, might this be indicative of a short circuit in the internal circuitry? Thank you.