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Chapter 1
Laboratory Preparation
The FOCUS GC system operates in an Overvoltage Category II environment, as
defined in International Standard EN 61010.
Below are definitions for the most common voltage disturbances:
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 surges of up to several thousand volts,
with durations of less than 50 µs.
Harmonic distortion is a high-frequency disturbance that appears as distortion of
the fundamental sine wave. Total harmonic distortion should be less than 3%.
Effects of Voltage Disturbances
Constant high line voltage 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. Transients, even of a few microseconds duration,
can cause electronic devices to fail catastrophically or to degrade, shortening their
lives significantly. Harmonic distortion can cause noise in power supply lines and
degrade the performance of the instrument. Therefore, it is important to establish
the quality of the line power in your laboratory prior to the installation of your
FOCUS GC system.
NOTE
The interconnected power outlets for the FOCUS GC system require a common point to
one ground connector. If there are two such points, with each connected to separate
external grounds, noise current will flow through the ground system via the ground loop
that is formed.
Wall Outlets
The power cable from the FOCUS GC is approximately 3 m (9 ft) long.
NOTE
Use an Uninterruptible Power Source (UPS) to protect your data system against possible
loss due to power outages. At this time, we do not recommend using a UPS with the GC.
24
Power Requirements
Site Preparation and Installation Manual
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