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Thermo Fisher Scientific

Quality of Power


  • The quality of power supplied to your system is very important for its performance.
  • The quality of line voltage must be stable and within the specifications.
  • The line voltage must be free voltage surges, sags, or transients.


Q Exactive GC


Definitions for the most common voltage disturbances
  • Harmonic distortion is a high-frequency disturbance that might affect operation of your system. This disturbance appears as distortion of the fundamental sine wave.
  • Slow average is a gradual, long-term change in average root mean square (RMS) voltage level, with typical durations greater than 2 s.
  • Sags and surges are sudden changes in average RMS voltage level, with typical durations between 50 μs and 2 s. 
  • Transients (or impulses) are brief voltage excursions of up to several thousand volts with durations of less than 50 μs.
Additional Information
  • Harmonic distortion causes noise in the power supply lines and degrades instrument performance.
  • Constant high line voltage, impulses, or surges in voltage can cause overheating and component failures.
  • Constant low line voltage or sags in voltage can cause the system to function erratically or not at all.
  • Transients, even of a few microseconds duration, can cause electronic devices to fail catastrophically or to degrade and eventually shorten the lifetime of your system.
  • Thermo Fisher Scientific recommends using power monitoring and conditioning devices.


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