HAWKER 800XP FLT CREW HAS A MALFUNCTIONING GENERATOR; EMER DECLARED; LANDED AS A PRECAUTION.

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APPROX 1 HR FROM ZZZ WE NOTICED A VIBRATION IN THE ACFT; WHICH AFTER FURTHER INVESTIGATION DETERMINED TO BE A FAULTY GENERATOR. AFTER WEIGHING OUR OPTIONS; WE DETERMINED THAT ZZZ WHICH WAS RPTING VMC CONDITIONS; WAS STILL TO BE USED AS OUR FINAL DEST. IN THIS CONTINUED PROCESS WE DETERMINED THAT THE APU GENERATOR WAS TO BE USED; WITH THE DEACTIVATION OF THE FAULTY GENERATOR. THIS WAS ACCOMPLISHED UPON REACHING THE APPROPRIATE APU OP ALT. AN UNDETERMINED AMOUNT OF TIME AFTER THIS NEW GENERATOR CONFIGN HAD BEEN ENTERED; WHEN WE WERE ADVISED BY ATC THAT ALL TFC HEADED TO ZZZ WERE NOW TO EXPECT HOLDING INSTRUCTIONS. UPON RECEIVING HOLDING INSTRUCTIONS; IT WAS DETERMINED THAT OUR HOLDING FIX WAS A GOOD DISTANCE OUT OF OUR CURRENT FLT PLAN RTE; THAT THE EFC TIME WAS APPROX 40 MINS AWAY AND THIS WOULD NOW HAVE US VERY NEAR A LOW FUEL SITUATION. WE RELAYED THIS INFO TO ATC ALONG WITH OUR CONCERNS OF THIS DEVELOPING INTO SOMETHING MORE SERIOUS. SEVERAL XMISSIONS LATER A PHONE NUMBER WAS REQUESTED BY MY COUNTERPART SO AS TO TRY TO RESOLVE THIS MATTER. SEVERAL MINS INTO THE PHONE CONVERSATION; I WAS INFORMED THAT AN EMER HAD BEEN DECLARED FOR US BY ATC. WE NOW RECEIVED A CLRNC BACK TOWARDS ZZZ AND PROCEEDED TO LAND SAFELY.