Measurement Computing DaqBoard 3000USB Series - Manual (Page 60)

3-2 CE-Compliance & Noise Considerations 949290 User’s Manual
The specific safety conditions for CE compliance vary by product; but general safety conditions include the
following bulleted items:
• The operator must observe all safety cautions and operating conditions specified in the
documentation for all hardware used.
• The host computer and all connected equipment must be CE compliant.
• All power must be off to the device and externally connected equipment before internal access to the
device is permitted.
• Ensure that isolation voltage ratings do not exceed documented voltage limits for power and signal
inputs. All wire insulation and terminal blocks in the system must be rated for the isolation voltage
in use. Voltages above 30 Vrms or ±60 VDC must not be applied if any condensation has formed on
the device.
• Current and power use must not exceed specifications. Do not defeat fuses or other over-current
protection.
Emissions/Immunity Conditions
The specific immunity conditions for CE compliance vary by product. General immunity conditions include the
following:
• 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, as noted on the Declaration of Conformity, if applicable to the device.
CE Rules of Thumb
The IOtech device is CE Compliant at the time it leaves the factory and should remain in compliance as long as the
conditions stated on the Declaration of Conformity continue to be met.
A few general rules of thumb:
• Use short cables.
• When assembling or disassembling components, take ESD precautions,
including the use of grounded wrist straps.
• Ensure that the host computer is CE Compliant.
• Review the most recent Declaration of Conformity.
• Ensure all system components are properly grounded.