UEi Test Instruments DMEG3 - Manual (Page 2)

Introduction
Your UEi Megohmeter allows you to predict, prevent and identify
insulation failures that can cause appliance failure, stop production,
create power problems and even put lives at risk. It quickly tests
insulation integrity on motors, power distribution systems and other
installed wiring.
All insulation has a limited life span and environmental factors such as
heat, cold and airborne chemicals can rapidly decrease an insulating
material’s predicted life. Use this instrument to help you quickly and
safely determine your insulation's integrity.
Features include
• Large digital display that shows the test function along with the
measured value on the DMEG3 or a high-contrast analog display
on the IRT3
• AC Voltage measurement to 600 Volts
• Insulation resistance readings from 0 to 2000 Megohms with
the DMEG3 or 400 Megohms with the IRT3
• Three test-voltage ranges (250, 500, 1000 V DC)
• Live circuit (external voltage applied) warning light
• Fuse protected against accidental misuse
• Precision resistance measurement to 0.01 ohms with audible
continuity (DMEG3 only)
• 200 mA short-circuit continuity test current for high accuracy
(DMEG3 only)
• Precision, low resistance test leads (1000 Volt CAT III rated)
• Audible continuity (DMEG3 only)
• Green LED power-on indicator (DMEG3 only)
• Low battery indication/detection
• Maintains rated voltage on cables with up to 1 mA leak-rate
• Automatic, post-test cable discharge
• Rugged, compact case with latching cover to keep the elements out
Safety Notes
Before using this meter, read all safety information carefully. In
this manual the word "WARNING" is used to indicate conditions
or actions that may pose physical hazards to the user. The word
"CAUTION" is used to indicate conditions or actions that may
damage this instrument.
This Megohmeter is designed and manufactured in accordance with the
following orgainizational standards:
• IE C 1010 CAT III, BS 16th Edition
• EN 61010
• IEC Publication 34 8
These guidlines apply apecifically to your instrument:
• Do not attempt to measure any voltage that exceeds the ca t e g o ry
based rating of this meter (CAT III, 600 Vo l t s )
• Do not attempt to use this meter if either the meter or the test
leads have been damaged. Return the damaged meter to UEi for
repair or replace your test leads
• Ensure meter leads are fully seated and operable by making a quick
c o n t i n u i ty check of the leads prior to making voltage measurements
• Keep your fingers away from the test lead’s metal probe contacts
when making measurements. Always grip the leads behind the finger
guards molded into the probes
• Do not open the bottom of the meter to replace batteries or the fuse
while the probes are connected tothe meter or this meter is on
This meter was designed for use by service professionals who know the
hazards associated with their trade. Exceeding the specified limits of this
meter is dangerous and can cause serious injury. To ensure safe and
appropriate use, please observe the following safety guidelines:
• Follow manufacturer’s specified testing and troubleshooting
procedures for the equipment you are working on
• Protect yourself from direct contact with voltages above 60 volts
DC or 25 volts AC, as they may constitute a serious shock hazard
• Always turn off power to a circuit (or assembly) under test before
cutting, unsoldering, or breaking the current path. Even small
amounts of current can be dangerous
• Always disconnect the live (normally red) test lead before
disconnecting the common (normally black) test lead from a circuit
• In the event of electrical shock, ALWAYS bring the victim to
the emergency room for evaluation, regardless of the victim’s
apparent recovery
Higher voltages require greater awareness of physical safety hazards.
When it’s possible to make clip-on connections to the circuit under test,
make the connections without power applied:
1. Turn off the power to the circuit under test.
2. Set the meter to the AC 600 Volt position.
3. Connect the test leads to the meter and then to the circuit
under test.
4. Reapply power.
5. Record measurement or adjust equipment as necessary.
6. Turn off power and disconnect test leads.
If any of the following indications occur during testing, turn off the
power source to the circuit under test:
• Arcing • Extreme heat
• Flame • Smell of burning materials
• S m o k e • Discoloration or melting of components
DMEG3/IRT3-MAN P. 1
Electrical shock can cause an unstable heart rhythm
that may need medical attention.