Fluke 79 III User Manual

®
PN 659349 December 1997 Rev.2, 3/00 ©1997, 1999, 2000 Fluke Corporation. All rights reserved. Printed in U.S.A. 1
79/26
Series III Multimeter
Calibration Information
Introduction
WWarning
To avoid electric shock, do not perform any servicing other than that contained
in the Users or Service manual unless you are qualified to do so. These service
instructions are for use by qualified personnel only.
This Calibration Information for the 79/26 Series III Multimeter (hereafter known as “the Meter”) provides
the information necessary to calibrate the meter and verify its performance. This information sheet provides
the following information:
• Product specifications
• Specifications
• Basic Maintenance
• Disassembly and reassembly
• Performance test procedures
• Calibration and calibration adjustment procedures
• Replacement parts
For complete operating instructions, refer to the 79/26 Series III Instruction Sheet.
Service
The Meter has a limited lifetime warranty. To contact Fluke, call one of the following telephone numbers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-678-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
For additional information about Fluke, its products, and services, visit Fluke’s web site at:
www.fluke.com

Fluke 79 III Specifications

General

Category	Multimeter
Display Type	Digital
True RMS	No
Voltage DC	1000V
Voltage AC	750V
Current DC	10A
Current AC	10A
Resistance	40MΩ
Continuity	Yes
Diode Test	Yes
Battery Type	9V
Resistance Range	400Ω to 40MΩ
Display	4000 count LCD
DC Voltage Range	400 mV, 4 V, 40 V, 400 V, 1000 V
AC Voltage Range	400 mV, 4 V, 40 V, 400 V, 750 V
DC Current Range	10μA to 10A
AC Current Range	10μA to 10A

Summary

Introduction

Service

Safety Information

Specifications

Recommended Equipment

Basic Maintenance

Opening the Meter Case

Step-by-step guide on how to open the device case for maintenance.

Replacing the Battery

Instructions for replacing the 9V battery in the multimeter.

Reassembling the Meter Case

Procedure for correctly reassembling the meter case after maintenance.

Testing Fuses

Procedure to test the internal fuses (F1 and F2) of the meter.

Replacing Fuses

Guide on how to examine and replace the meter's fuses.

Replacing the Bottom Case Assembly

Steps to remove and replace the bottom case assembly of the meter.

Replacing the LCD

Instructions for removing and installing a new LCD screen.

Cleaning

Performance Tests

Testing the Display

Verifies that all display segments function correctly when the meter is turned on.

Testing the DC Voltage Function

Procedure to verify the accuracy of DC voltage measurements.

Testing the mV DC Function

Procedure to verify the accuracy of millivolt DC measurements.

Testing the AC Voltage Function

Procedure to verify the accuracy of AC voltage measurements.

Testing the Frequency Function

Procedure to verify the accuracy of frequency measurements.

Testing the Ohms Function

Procedure to verify the accuracy of resistance measurements.

Testing the Lo-Ohms Function

Procedure to verify the Lo-Ohms measurement function.

Testing the Capacitance Function

Procedure to verify the accuracy of capacitance measurements.

Testing the Continuity Function

Procedure to verify the continuity test function and beeper.

Testing the DC and AC Current Function

Procedure to verify DC and AC current measurement accuracy.

Calibration Adjustment

Lo-Ohms Calibration

Replacement Parts