They are very good for signal injection purposes, providing sweep and video signals at various amplitudes and polarities to inject into various stages of a set.
Personally, I prefer the later Sencore VA62 for that purpose, though. A bit more compact and easier to use. The B&K analysts can provide HOT plate drive direct to the flyback, though, which the Sencore can't do. And the B&K also has the ability to produce custom images by simply creating a new transparency slide for the flying spot scanner.
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