ISQ EC and ISQ EM Mass Spectrometer Preinstallation Requirements Guide
Page 36
task best handled by a company or consultant specializing in
that field. Contact your regional Thermo Fisher Scientific
Customer Service office for assistance in locating a power
consultant. Having a poor quality power source degrades the
ISQ EC or ISQ EM MS system performance.
Some examples of poor power source quality are:
•
Harmonic distortion causes noise in the power supply
lines and degrades instrument performance. Harmonic
distortion is a high-frequency disturbance that may
affect operation of your ISQ EC MS. This disturbance
appears as distortion of the fundamental sine wave.
Total harmonic distortion should be less than 6%.
•
Slow changes are gradual, long-term changes in average
root mean square (RMS) voltage level, with typical
durations greater than 2 s.
•
Sags and swells are slow changes in average root mean
square (RMS) voltage level, with typical durations
between 50 ms and 2 s.
•
Transients, even of a few microseconds duration cause
electronic devices to fail or to degrade and significantly
shorten their lives. Transients (or impulses) are brief
voltage excursions of up to several thousand volts with
durations less than 50 ms.
♦
Voltage variations must not exceed 10% of the nominal value.
♦
Transient overvoltages must not exceed those specified in
category II of IEC 60364-4-443.
Use Table 3 to determine how many circuits and wall outlets you
need. Keep in mind:
♦
Power must be single-phase.
♦
Wall outlets must have earth-ground hard-wired to the main
panel.
♦
Included power cords are 2 m (6 ft) long.
