Fluke 87 III, 85 III, 83 III, 80 III Service Manual

®

80 Series III

Multimeters

Service Information

PN 688645 April 1998 Rev.2, 6/02

© 1998-2002 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.

Lifetime Limited Warranty

Each Fluke 20, 70, 80, 170 and 180 Series DMM will be free from defects in material and workmanship for its lifetime. As used herein, “lifetime” is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from the date of purchase. This warranty does not cover fuses, disposable batteries, damage from neglect, misuse, contamination, alteration, accident or abnormal conditions of operation or handling, including failures caused by use outside of the product’s specifications, or normal wear and tear of mechanical components. This warranty covers the original purchaser only and is not transferable.

For ten years from the date of purchase, this warranty also covers the LCD. Thereafter, for the lifetime of the DMM, Fluke will replace the LCD for a fee based on then current component acquisition costs.

To establish original ownership and prove date of purchase, please complete and return the registration card accompanying the product, or register your product on http://www.fluke.com. Fluke will, at its option, repair at no charge, replace or refund the purchase price of a defective product purchased through a Fluke authorized sales outlet and at the applicable international price. Fluke reserves the right to charge for importation costs of repair/replacement parts if the product purchased in one country is sent for repair elsewhere.

If the product is defective, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Fluke will pay return transportation for product repaired or replaced in-warranty.

Before making any non-warranty repair, Fluke will estimate cost and obtain authorization, then invoice you for repair and return transportation.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY. AUTHORIZED RESELLERS ARE NOT AUTHORIZED TO EXTEND ANY DIFFERENT WARRANTY ON FLUKE’S BEHALF. Since some states do not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages, this limitation of liability may not apply to you. If any provision of this warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

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Table of Contents

Title	Page
Introduction .......................................................................................................	1
Precautions and Safety Information ..................................................................	2
International Symbols........................................................................................	2
Safety Information.............................................................................................	3
Specifications ....................................................................................................	4
Accuracy .......................................................................................................	4
General ..........................................................................................................	4
AC Voltage Specifications (Models 85 and 87) ...........................................	5
AC Voltage Specifications (Model 83).........................................................	5
DC Voltage, Resistance, and Conductance Specifications...........................	5
Current Specifications...................................................................................	6
Capacitance and Diode Function Specifications ..........................................	6
Frequency Counter Specifications ................................................................	6
Frequency Counter Sensitivity and Trigger Levels ......................................	7
MIN MAX Recording Specifications ...........................................................	7
Electrical Characteristics of the Terminals...................................................	8
Required Equipment..........................................................................................	8
Basic Maintenance ............................................................................................	9
Opening the Meter Case................................................................................	9
Removing and Reinserting the Circuit Board Assembly ..............................	10
Reassembling the Meter Case .......................................................................	11
Replacing the Battery....................................................................................	11
Testing Fuses (F1 and F2).............................................................................	12
Replacing Fuses ............................................................................................	13
Cleaning ........................................................................................................	13
Input Terminals.........................................................................................	13
Rotary Switch ...........................................................................................	14
Performance Tests .............................................................................................	14
A Basic Operability Test...............................................................................	14
Testing the Display .......................................................................................	15
Testing the Rotary Switch.............................................................................	15
Testing the AC Voltage Function .................................................................	16
Testing the Frequency Function....................................................................	17
Testing the Frequency Sensitivity and Trigger Level ...................................	17
Testing DC Voltage ......................................................................................	18
Testing the PEAK MIN MAX Function (Model 87 only)............................	18

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Service Manual

Testing the mV DC Function ........................................................................	19
Testing the Resistance Function ...................................................................	19
Testing the Capacitance Function.................................................................	20
Checking the Diode Test Function................................................................	20
Testing the Milliamp (mA) Function ............................................................	21
Testing the Microamp (µA) Function ...........................................................	21
Testing the Amp (A) Function ......................................................................	22
Calibration .........................................................................................................	23
Calibrating the Model 85 and 87 III..............................................................	23
Calibrating the Model 83 III .........................................................................	25
Parts and Accessories ........................................................................................	25

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List of Tables

Table	Title	Page
1.	International Symbols ............................................................................................	2
2.	Required Tools and Equipment .............................................................................	9
3.	Rotary Switch Test ................................................................................................	16
4.	AC Voltage Test ....................................................................................................	16
5.	Frequency Test.......................................................................................................	17
6.	Frequency Counter Sensitivity and Trigger Level Tests .......................................	18
7.	DC Voltage Test ....................................................................................................	18
8.	Peak MIN MAX Test.............................................................................................	19
9.	Ohms Tests ............................................................................................................	20
10.	Capacitance Tests ..................................................................................................	20
11.	mA Tests ................................................................................................................	21
12.	μA Tests.................................................................................................................	22
13.	Current Tests..........................................................................................................	22
14.	Replacement Parts .................................................................................................	25
15.	Accessories ............................................................................................................	26

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80 Series III

Service Manual

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List of Figures

Figure	Title	Page
1.	Disassembly Details...............................................................................................	10
2.	Battery and Fuse Replacement ..............................................................................	11
3.	Testing the Current Input Fuses.............................................................................	12
4.	Display Test ...........................................................................................................	15
5.	Calibration Adjustment Points...............................................................................	24
6.	Replaceable Parts...................................................................................................	26

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80 Series III

Service Manual

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Introduction

W Warning

To avoid shock or injury, do not perform the verification tests or calibration procedures described in this manual unless you are qualified to do so.

The information provided in this document is for the use of qualified personnel only.

Caution

The 80 III Multimeter contains parts that can be damaged by static discharge.

Follow the standard practices for handling static sensitive devices.

The 80 Series III Service Information provides the following information:

∙Precautions and safety information

∙Specifications

∙Basic maintenance (cleaning, replacing the battery and fuses)

∙Performance test procedures

∙Calibration and calibration adjustment procedures

∙Accessories and replaceable parts

For complete operating instructions, refer to the 80 Series III Users Manual.

To contact Fluke, call:

USA: 1-888-99-FLUKE (1-888-993-5853)

Canada: 1-800-36-FLUKE (1-800-363-5853)

Europe: [phone]

Japan: [phone]

Singapore: [phone]

Anywhere in the world: [phone]

For additional information about Fluke, its products, and services, visit Fluke’s web site at:

www.fluke.com

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80 Series III

Service Information

Precautions and Safety Information

Use the Meter only as described in the Users Manual. If you do not do so, the protection provided by the Meter may be impaired.

Read the “Safety Information” page before servicing this product.

In this manual, a Warning identifies conditions and actions that pose hazard(s) to the user; a Caution identifies conditions and actions that may damage the Meter or the test instruments.

International Symbols

International symbols used on the Meter and in this manual are explained in Table 1.

Table 1. International Symbols

Symbol	Meaning

Alternating current

Direct current

Alternating or direct current

Refer to the manual. Important information.

Take appropriate precautions.

Hazardous voltage may be present

Battery

Symbol	Meaning

Earth ground

Fuse

Conforms to European Union directives

Conforms to relevant Canadian

Standards Association directives

TDouble insulated

OIEC overvoltage category III

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Multimeters

Safety Information

Safety Information

WWarnings and Precautions

To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, follow these guidelines:

∙Before using the Meter inspect the case. Do not use the Meter if it is damaged. Look for cracks or missing plastic. Pay particular attention to the insulation around the connectors.

∙Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads before using the Meter.

∙Verify the Meter’s operation by measuring a known voltage. Do not use the Meter if it operates abnormally. Protection may be impaired. When in doubt, have the Meter serviced.

∙Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and earth ground.

∙Use caution when working with voltages above 30 V ac rms, 42 V ac peak, or 60 V dc. These voltages pose a shock hazard.

∙Use the proper terminals, function, and range for your measurements.

∙Do not operate the Meter around explosive gas, vapor, or dust.

∙When using the probes, keep your fingers behind the finger guards.

∙When making connections, connect the common test lead before connecting the live test lead; when disconnecting, disconnect the live test lead before disconnecting the common test lead.

∙Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance.

∙Before measuring current, check the Meter's fuses (see “Testing Fuses”) and turn OFF power to the circuit before connecting the Meter to the circuit.

∙Do not operate the Meter with the case (or part of the case) removed.

∙Use only a single 9 V battery, properly installed in the battery receptacle, to power the Meter.

∙Replace the battery as soon as the battery indicator (M) appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury,

∙Remove test leads from the Meter before opening the Meter case.

∙When servicing the Meter, use only specified replacement parts.

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