In addition to what 57 said, for TV signals try to find broadcasts of colour test patterns. Many SD stations show these while off the air. For HD, HDnet schedules a series of patterns at least once a week. Showcase HD transmits a standard colour bar and PLUGE most mornings just before 6:00 (or maybe it's 7:00).
You can use these along with the glasses and instructions that you got with DVE to help calibrate your TV sources.
You can use these along with the glasses and instructions that you got with DVE to help calibrate your TV sources.