Best way would be to purchase a flyback transformer tester for television.
http://cpc.farnell.com/jsp/endecaSearch/manufacturer.jsp?comSearch=true&showImages=true&manufacturerDisplay=true&N=411+5818&Ne=1000
I think this one is for testing with the transformer out of circuit but others are available for testing in circuit.
Note that a different type is used for monitors.
sparky
May 2006