When I set up my HDR the dish was already set up for a Sky box. (same direction for same satellite ) so I've not been there.
However a satmeter would not be much use if it didnt work with a new set top box !!
I've heard about folk using batteries to set up dishes without using a coax connection to the Set Top Box. But if you are setting up the system there is no point.
If you are unsure about polarity, just make sure the connection on the satmeter marked LNB goes via about a meter of coax to the LNB (a meter lets you stand behind the dish, while manouvering the dish).
The other connection, usually marked "to reciever" goes via a longer coax to LNB1 on the HDR.
See p16 of the user manual for the various options.
Hope this helps
David