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PE 1300 AAS Noisy chopper

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mickey:
Having problem with a noisy chopper.
AAS Instrument: Perkin Elmer AAS 1300.
Uses: Cold Vapour and Hydride Generation.
Lamp: EDL (electrodeless discharge lamps)
Effect of noisy chopper: minute vibration of EDL causing very noisy baseline drifts.
Action taken: checked posibility of chopper touching casing but that is not the case.

Any help, suggestions/advice would be appreciated.

mickey

kevins:
Please check the chopper bearing, it may be lost of lubricant.

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