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Luminous suppression error when turning off the 8564E

Question asked by magnetling on Mar 30, 2018
Latest reply on Apr 14, 2020 by noiseguy

I have the wonderful spectrum analyzer 8564 E. Only when turning off the light spot is not suppressed. You see a roughly rectangular light field that fades in 1-2 seconds. What could I investigate for lack of circuit?

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