Measurement Computing DaqBook 2000 Series - Manual (Page 58)

For clarification, terms used in some Declarations of Conformity include:
• pollution degree: any addition of foreign matter, solid, liquid or gaseous (ionized gases) that may
produce a reduction of dielectric strength or surface resistivity. Pollution Degree I has no influence
on safety and implies: the equipment is at operating temperature with non-condensing humidity
conditions; no conductive particles are permitted in the atmosphere; warm-up time is sufficient to
avert any condensation or frost; no hazardous voltages are applied until completion of the warm-up
period. Pollution Degree II implies the expectation of occasional condensation.
• overvoltage (installation) category: classification with limits for transient overvoltage, dependent
on the nominal line voltage to earth. Category I implies signals without high transient values.
Category II applies to typical mains power lines with some transients.
Safety Conditions
Users must comply with all relevant safety conditions in the user’s manual and the Declarations of
Conformity. This manual and Daq hardware make use of the following Warning and Caution symbols:
If you see either of these symbols on a product, carefully read the related information and be alert to the
possibility of personal injury.
This warning symbol is used in this manual or on the equipment to warn of possible
injury or death from electrical shock under noted conditions.
This warning/caution symbol is used to warn of possible personal injury or equipment
damage under noted conditions.
Daq products contain no user-serviceable parts; refer all service to qualified personnel. The specific
safety conditions for CE compliance vary by product; but general safety conditions include:
• 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.
• 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; 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.
7-2 CE-Compliance & Noise Considerations 897995 DaqBook/2000 and DaqOEM/2000 Series