Page 2 - FLUKE DIGITAL MULTIMETERS | Solutions for every need

Choosing the right digital multimeter (DMM) requires thinking about what you’ll be
using it for. Evaluate your basic measurement needs and job requirements and then
take a look at special features/functions built into many multimeters. Think about
whether you need to do basic measurements, or if you need the more advanced
troubleshooting options offered by special features.
Factors to consider:
• Your work environment (voltage level, types of equipment,
types of measurements, applications)
• Specialty features/functions (capacitance, frequency, temperature, non-contact voltage,
low impedance mode, min-max record, data logging, trending)
• Resolution and accuracy (6,000, 20,000, or 50,000 count resolution)
More information www.fluke.co.uk
Digital Multimeter Comparison Chart
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Measurement
category
In brief Examples
CAT I Electronic • Protected electronic equipment
• Equipment connected to (source) circuits in which
measures are taken to limit transient overvoltages
to an appropriately low level
• Any high-voltage, low-energy source derived from
a high-winding resistance transformer, such as the
high-voltage section of a copier
CAT II Appliances, PCs,
and TVs
• Appliance, portable tools, and other household and
similar loads
• Outlet and long branch circuits
• Outlets at more than 10 meters (30 feet) from
CAT III source
• Outlets at more that 20 meters (60 feet) from
CAT IV source
CAT III MC panels, etc. • Equipment in fixed installations, such as switchgear
and polyphase motors
• Bus and feeder in industrial plants
• Feeders and short branch circuits, distribution
panel devices
• Lighting systems in larger buildings
• Heavy appliance outlets with short connections to
service entrance
CAT IV Three-phase at utility Refers to the “origin of installation,” i.e., where
ANSI/ISA S82.02
Service
Entrance Meter
Meter
Service
Entrance
Meter
Outbuilding
Outbuilding Transformer
Underground Service
Underground Service
Service
Entrance
CAT I
• Electronic
equipment
• Low energy
equipment
with transient
limiting
protection
• Any high-
voltage,
low-energy
source derived
from a high-
winding
resistance
transformer
CAT II
• Appliances and
portable tools
• Outlets and long
branch circuits
– Outlets at
more than
10 m (30 ft.)
from CAT III
source
– Outlets at
more than
20 m (60 ft.)
from CAT IV
source
CAT IV
• Origin of installation: where
low-voltage connection is made
to utility power
• Electricity meters, primary
overcurrent protection equipment
• Outside and service entrance
• Service drop from pole to building
• Run between meter and panel
• Overhead line to detached
building
• Underground line to well pump
CAT III
• Equipment in fixed installations:
switchgear and three-phase
motors
• Bus and feeder in industrial
plants
• Feeders and short branch
circuits
• Distribution panel devices
• Heavy appliance outlets with
short connections to s rvice
entrance
• Large lighting systems
CAT I CAT II CAT III CAT IV