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1. GENERAL INSTRUCTIONS
This instrument complies with IEC 61010-1:2001, CAT III 1000V and CAT IV 600V overvoltage
standards. See Specifications. To get the best service from this instrument, read carefully this
user’s manual and respect the detailed safety precautions. International symbols used on the Meter
in this manual are explained in chapter 1.2.
1.1. Precautions safety measure
1.1.1. Preliminary
*
As the possibilities of high transient overvoltages occurred in today’s power system increase,
more stringent safety standards are set for the electrical test equipment. Transients on electrical
system (power grid, feeder or branch circuits) will trigger a series of incidents that may result in
serious personal injury. To protect you against transient, safety must built into the test equipment.
Overvoltage
category
In brief
Examples
CAT I
Electronic
•
Protected electronic equipment
•
Equipment connected to (source) circuits In chich
measures are taken to limit transient overvoltages to
an appropriately low level.
•
Any high-voltage, low-energy source derived from
a highwinding resistance transformer, such as the
high-voltage section of a copier
CAT II
Single-phase
receptacle
connected loads
•
Applience, portale tools, and Rother household and
similar loads.
•
Outlet and long branch circuits.
•
Outlets At more than 10 meters (30feet) from CAT
III
•
Outlets At more that 20 meters (60 feet) from CAT
IV source
CAT III
Three-phase
distribution,
including single-
phase commercial
lighting
•
Equipment in fixed installations, such as switchgear
and polyphase motors.
•
Bus and Fedder in industrial plants
•
Feeders and short branch circuits, distributions
panel devices.
•
Lighting system in Langer buildings.
•
Appliance outlets with short connections to service
entrance
CAT IV
Three-phase at
utility connection,
any outdoor
conductros
•
Refers to the „origin of installation”; ie., where
low-voltage connection is made to utility power.
•
Electricity meters, primary overcurrent protection
equipment
•
Outsider and service entrance, service drop from
pole to building, run between meter and panel.
•
Overhead line to detached building, underground
line to well pump.
*
When using this multimeter, the user must observe all normal safety rules concerning:
- protection against the dangers of electric current
Summary of Contents for AX-174
Page 1: ...AX 174 INSTRUCTION...