Lakeshore 331S User Manual page 4

Electromagnetic Compatibility (EMC) for the Model 331 Temperature Controller
Electromagnetic Compatibility (EMC) of electronic equipment is a growing concern worldwide.
Emissions of and immunity to electromagnetic interference is now part of the design and manufacture
of most electronics. To qualify for the CE Mark, the Model 331 meets or exceeds the requirements of
the European EMC Directive 89/336/EEC as a CLASS A product. A Class A product is allowed to
radiate more RF than a Class B product and must include the following warning:
WARNING: This is a Class A product. In a domestic environment, this product may
cause radio interference in which case the user may be required to take
adequate measures.
The instrument was tested under normal operating conditions with sensor and interface cables
attached. If the installation and operating instructions in the User's Manual are followed, there should
be no degradation in EMC performance.
This instrument is not intended for use in close proximity to RF Transmitters such as two-way radios
and cell phones. Exposure to RF interference greater than that found in a typical laboratory
environment may disturb the sensitive measurement circuitry of the instrument.
Pay special attention to instrument cabling. Improperly installed cabling may defeat even the best
EMC protection. For the best performance from any precision instrument, follow the grounding and
shielding instructions in the User's Manual. In addition, the installer of the Model 331 should consider
the following:
• Shield measurement and computer interface cables.
• Leave no unused or unterminated cables attached to the instrument.
• Make cable runs as short and direct as possible. Higher radiated emissions is possible with
long cables.
• Do not tightly bundle cables that carry different types of signals.
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Lake Shore Model 331 Temperature Controller User's Manual