Measurement Computing DaqScan 2000 Series - Manual (Page 48)

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 959195 DaqLab/2000 Series and DaqScan/2000 Series