Megger DLRO Bedienungsanleitung

AVTM24-1J

Rev A

April 2006

Instruction Manual

DLRO®

Digital Low Resistance Ohmmeters

Catalog No. 247000 Series

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)

DLRO®

Digital Low Resistance Ohmmeters

Catalog No. 247000 Series

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.

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

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.

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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