Chopper Wheel Motor Assembly
Precision DC motor with infrared chopper wheel for lock-in amplification in monochromator-based spectrometers (9027.30.40). Modulates light source for signal detection. Electrical modulation component under 9027.90.56.30.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If DC motors sold separately without chopper wheel
General electric motors classify in chapter 85 regardless of potential applications.
If used in non-spectroscopic measuring instruments
Parts classification follows principal instrument per chapter note 2(b).
If general laboratory motion control components
Non-dedicated lab equipment parts fall to machinery provisions.
Not sure which classification is right?
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Import Tips & Compliance
• Specify chopper frequency, blade count, and compatible detection systems
• Document electrical specifications (RPM, voltage) and thermal management features
• Include vibration isolation specifications proving analytical instrument quality
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