Bell & Howell test patterns: Difference between revisions
→Test pattern types
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* White screen, 933 Hz tone (medium clicking, 15 seconds)
* White screen, 933 Hz tone (30 seconds)
* White screen, 933 Hz tone (60 seconds)
* White screen, 967 Hz tone (60 seconds)
* White screen, 1000 Hz tone (15 seconds)
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