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What output are you expecting? Sp pd8 is a 6v hub.
Dynohubs are constant current devices. The voltage a hub generates is generally proportional to the speed you're going and also dependent (inversely proportional?) to the resistance of the load it is driving.
A "6V hub" is one that will generate roughly 6V at the bottom of end of normal cycling speeds (assuming it is built into an appropriately sized wheel) and driving a typical lamp. Modern lamps have voltage regulators to protect the lighting from over-voltage, and they throw away the excess power generated as heat. On a near-open circuit (i.e. just the mutlimeter) you can see 50V+ from a 6V dynohub if you give the wheel a good spin.
A "12V hub" will generate 12V at the bottom end of normal cycling speeds, but produce half the current of the "6V" hub.
Lights/etc will be designed to run against one or the other of the systems.
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Greenbank
What output are you expecting? Sp pd8 is a 6v hub.