Measurement Computing WaveBook rev.5.3 - Manual (Page 107)

Emissions/Immunity Conditions
The specific immunity conditions for CE compliance vary by product; but general immunity conditions
include:
Cables must be shielded, braid-type with metal-shelled connectors. Input terminal connections are
to be made with shielded wire. The shield should be connected to the chassis ground with the
hardware provided.
The host computer must be properly grounded.
In low-level analog applications some inaccuracy is to be expected when I/O leads are exposed to
RF fields or transients over 3 or 10 V/m as noted on the Declaration of Conformity.
Using Shielded BNC Connectors for CE Compliance
Certain Declarations of Conformity identify specific cables and connectors that must be used to meet CE
requirements. CE compliant BNC-equipped cards and modules have BNC connectors that are insulated
from high voltage sources, including electrostatic discharges (ESD). Such voltages could enter the
circuitry through the exposed conductive surface of a connector, possibly resulting in damage to
components.
O-Ring
Dust Cap
Shielded
BNC Connector
Shielded BNC Connector (with O-Ring) and PVC Dust Cap
To meet CE requirements, PVC dust caps (p/n CN-96) must cover all unused BNC connectors. When dust
caps are not in place, special coaxial cables (with insulated end-connectors and rubber O-rings) must be
used. Note that part number 418-0800 includes two cables (with shielded BNC connectors at each end),
and four insulating O-rings.
Properly installed connectors and dust caps ensure the metallic surfaces of the connectors are not exposed
to undesirable electrical charges.
CE Compliance for WaveBook System Expansion
WaveBooks are CE Compliant at the time they leave the factory. They will remain in compliance
providing that the conditions stated on the WaveBook Declaration of Conformity (p/n 489-0740) continue
to be met.
Prior to making any efforts to expand the system refer to the Declaration of Conformity for each intended
system component. Connecting a non-CE Compliant module or card to your system will make the system
non-compliant. In certain scenarios the use of special shielded cables may be required.
A few general rules of thumb regarding the expansion of CE compliant WaveBook systems are:
Use short cables, e.g. CA-35-12, CA-202.
When possible use shielded cables.
When assembling or disassembling components, take ESD precautions,
including the use of grounded wrist straps.
Ensure that the host computer is CE Compliant.
Ensure that expansion devices are CE Compliant; and review
the most recent Declaration of Conformity for each device.
Ensure all system components are properly grounded.
WaveBook User’s Manual 897895 CE-Compliance & Noise Considerations 6-3