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Chapter 1 Taking Measurements with the NI 5620
© National Instruments Corporation 1-3 NI 5620 User Manual
Caution
Do not operate the device in an explosive atmosphere or where there may be
flammable gases or fumes. The device can only be operated at or below pollution degree 2,
as stated inAppendix A, Specifications. Pollutionis foreignmatter,solid, liquid, orgas that
may produce a reduction of dielectric strength or surface resistivity. The following is a
description of pollution degrees:
• Pollution degree 1: No pollution or only dry, non-conductive pollution
occurs. The pollution has no influence.
• Pollution degree 2: Normally only non-conductive pollution occurs.
Occasionally, however, a temporary conductivity caused by
condensation must be expected.
• Pollution degree 3: Conductive pollution occurs, or dry,
non-conductive pollution occurs, which becomes conductive due to
condensation.
Caution
Signal connections must be insulated for the maximum voltage for which the
device is rated. Do not exceed the maximum ratings for the device. Remove power from
signal lines before connection to or disconnection from the device.
Caution
This device can only be operated at installation category I, as stated in
Appendix A, Specifications. The following is a description of installation categories:
• Installation category IV is for measurements performed at the source
of the low-voltage installation. Examples are electricity meters and
measurements on primary over current protection devices and ripple
control units.
• Installation category III is for measurements performed in the building
installation. Examples are measurements on distribution boards,
circuit-breakers, wiring, including cables, bus-bars, junction boxes,
switches, socket-outlets in the fixed installation, and equipment for
industrial use and some other equipment such as stationary motors
with permanent connection to the fixed installation.
• Installation category II is for measurements performed on circuits
directly connected to the low voltage installation. Examples are
measurements on household appliances, portable tools and similar
equipment.
• Installation category I is for measurements performed on circuits not
directly connected to MAINS. Examples are measurements on circuits
not derived from MAINS, and specially protected (internal)
MAINS-derived circuits.
Caution
Clean the device with a soft non-metallic brush. The device must be completely
dry and free from contaminants before returning it to service.