Megger DLRO Manual de usuario
AVTM24-1J
Rev A
April 2006
Instruction Manual
DLRO®
Digital Low Resistance Ohmmeters
Catalog No. 247000 Series
M
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403-2329
U.S.A.
610-676-8500
www.megger.com
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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DLRO®
Digital Low Resistance Ohmmeters
Catalog No. 247000 Series
Copyright© 2006by Megger. All rights reserved.
The information presented in this manual is believed to be adequate for the
intended use of the product. If the product or its individual instruments are
used for purposes other than those specified herein, confirmation of their
validity and suitability must be obtained from Megger. Refer to the warranty
information below. Specifications are subject to change without notice.
WARRANTY
Products supplied by Megger are warranted against defects in material and
workmanship for a period of one year following shipment. Our liability is
specifically limited to replacing or repairing, at our option, defective
equipment. Equipment returned to the factory for repair must be shipped
prepaid and insured. Contact your MEGGER representative for instructions
and a return authorization (RA) number. Please indicate all pertinent
information, including problem symptoms. Also specify the serial number and
the catalog number of the unit. This warranty does not include batteries, lamps
or other expendable items, where the original manufacturer’s warranty shall
apply. We make no other warranty. The warranty is void in the event of abuse
(failure to follow recommended operating procedures) or failure by the
customer to perform specific maintenance as indicated in this manual.
M
Valley Forge Corporate Center
2621 Van Buren Ave
Norristown, PA 19403-2329
610-676-8500 (Telephone)
610-676-8610 (Fax)
www.megger.com
AVTM24-1J Rev AApril 2006 i
Table of Contents
1.0 10 Ampere Systems .....................................................................................1
Section A INTRODUCTION............................................................1
Section B SAFETY PRECAUTIONS .............................................3
Section C RECEIVING INSTRUCTIONS ..................................5
Section D SPECIFICATIONS...........................................................7
Section E CIRCUIT DESCRIPTION...........................................15
Section F CONTROLS AND CONNECTIONS.....................19
Section G OPERATING PROCEDURE....................................23
Section H APPLICATIONS.............................................................27
Section I MAINTENANCE.............................................................31
Section J FIELD REPLACEABLE PARTS LIST.....................33
Section K WARRANTY & REPAIR.............................................35
2.0 100 Ampere System..................................................................................37
Section A INTRODUCTION..........................................................37
Section B SAFETY...............................................................................41
Section C DESCRIPTION & SPECIFICATIONS..................43
Section D OPERATING PROCEDURE....................................47
Section E MAINTENANCE............................................................51
Section G RECOMMENDED TEST LEADS..........................53
Section H WARRANTY and REPAIR..........................................55
Section J FIELD REPLACEABLE PARTS LIST.....................57
-11 OPTION INPUT PROTECTION...................................................... 59
AVTM24-1J RevA April 2006 ii
List of Figures
Figure 1: Cat.No. 247000 DLRO instrument without charger ...iii
Figure 2: Various DLRO Unit Combinations.....................................6
Figure 3: Controls & Connections........................................................21
Figure 4: Typical Connections to a Test Sample............................25
Figure 5: Cat. No. 247101 DLRO consists of three elements:
Left: 100A Current Source Center: Measuring Module Right:
Charger Module for Measuring Module...................................36
Figure 6: Arrangement for Making Measurements in the 100-
Ampere Range...................................................................................49
AVTM24-1J Rev AApril 2006 iii
Figure 1: Catalog No. 247000 DLRO instrument without charger
AVTM24-1J RevA April 2006 iv
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AVTM24-1J Rev AApril 2006 1
1.0
10 Ampere Systems
Section A
INTRODUCTION
Part 1.0 of this manual applies to a series of instruments;
the principal models are Catalog Numbers 247000,
247001, 247002. Part 2.0 describes the 100 Ampere
systems including catalog numbers 247100, 247101 and
247120.
The Catalog No. 247000 Digital Low Resistance
Ohmmeter is a portable, rugged instrument that provides a
direct-reading digital display of resistance in five ranges. It
is powered by self-contained rechargeable batteries. A
battery charger, operating from J1SV 50/60 Hz, is
furnished in a separate package.
The Catalog No.247001 is similar to Catalog No. 247000
except that it has a built-in, line-operated charger.
M
AVTM24-1J REV AApril 2006 2
The Catalog No. 247100 is a 100 Ampere Test System
composed of a Catalog No. 247000 Measuring Module,
and a Cat. No. 247120 100-amp power supply. The
Catalog No. 24701 is also a 100 ampere test system.
The ohmmeter has four terminals for a Kelvin connection
to the sample under test, and it is recommended that
Biddle test leads shown in Bulletin 24-1be used with this
instrument.
Panel features include a two-position on-off switch that
allows continuous or momentary operation, and on the
rechargeable battery models a meter to indicate relative
state of charge of the internal batteries.
A prop is provided to keep the lid in a partly open position
so that it can be used as a sunshade when reading the
digital display in bright sunlight.
The Catalog No. 247002 is similar to Catalog No. 247001
except that it has an extra 600 µΩrange.
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