Built to with-
stand harsh
environments
with the highest
safety ratings
Rated all the way to CAT IV
ScopeMeter test tools are rugged solutions built
for industrial troubleshooting. The new Fluke
190 Series II are double-insulated floating
oscilloscopes safety rated for measurements in
CAT III 1000 V/CAT IV 600 V environments. The
two-channel Fluke 190C Series is rated CAT II
1000 V/CAT III 600 V.
Measure from mV to kV safely
Independent isolated inputs allow you to make
measurements in mixed circuits having different
ground references and reduces the risk of acci-
dental short circuits.
Conventional bench oscilloscopes without
special differential probes and isolation trans-
formers can only reference measurements to
line power earth ground.
With standard probes that cover a wide appli-
cation range from mV to kV, you’re ready for
anything from microelectronics to heavy-duty
medium voltage electrical applications.
The only IP-51 rated scopes on the
market
Rugged and shock-proof, ScopeMeter portable
oscilloscopes are built for harsh environments.
With its sealed case, it can endure
dust, drips,
humidity and airborne pollutants. Every time
you reach for the scope you can be confident it
will work reliably.
Overvoltage
category
In brief
Examples
CAT IV
Three-phase at
utility connection,
any outdoor
conductors
•
Refers to the “origin of installation,” that
is, 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
Three-phase
distribution,
including single-
phase commercial
lighting
•
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
•
Appliance outlets with short connections
to service entrance
CAT II
Single-phase
receptacle
connected loads
•
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 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
Table 1.
Overvoltage installation categories. IEC 61010 applies to
low-voltage
(< 1000 V) test equipment.
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