Fluke 789 Manuale utente

789/787B

ProcessMeter™

Users Manual

August 2002, Rev. 4, 1/17

All product names are trademarks of their respective companies.

LIMITED WARRANTY AND LIMITATION OF LIABILITY

This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This war-

ranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, or

abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf.

To obtain service during the warranty period, contact your nearest Fluke authorized service center to obtain return authoriza-

tion information, then send the product to that Service Center with a description of the problem.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR

PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE IS NOT LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since some states or countries

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.

Fluke Corporation

P.O. Box 9090

Everett, WA 98206-9090

U.S.A.

Fluke Europe B.V.

P.O. Box 1186

5602 BD Eindhoven

The Netherlands

11/99

Table of Contents

Title Page

Introduction .................................................................................................................... 1

How to Contact Fluke..................................................................................................... 2

Safety Information.......................................................................................................... 2

How to Get Started......................................................................................................... 6

Getting Acquainted with the Meter ................................................................................. 7

Measuring Electrical Parameters.................................................................................... 18

Input Impedance........................................................................................................ 18

Ranges...................................................................................................................... 18

Testing Diodes........................................................................................................... 18

Displaying Minimum, Maximum, and Average........................................................... 19

Using AutoHold.......................................................................................................... 19

Compensating for Test Lead Resistance................................................................... 20

Using the Current Output Functions............................................................................... 20

Source Mode............................................................................................................. 20

Simulate Mode........................................................................................................... 22

Producing a Steady mA Output................................................................................. 24

Manually Stepping the mA Output............................................................................. 25

Auto Ramping the mA Output.................................................................................... 26

789/787B

Users Manual

Power-Up Options ......................................................................................................... 26

Loop Power Supply Mode (789 only)............................................................................. 28

Battery Life..................................................................................................................... 30

Maintenance.................................................................................................................. 30

Calibration................................................................................................................. 31

Replacing the Batteries............................................................................................. 31

Replacing a Fuse...................................................................................................... 33

If the Meter does not Work........................................................................................ 34

Replacement Parts and Accessories............................................................................. 34

Specifications................................................................................................................. 38

ProcessMeter

Introduction

Warning

Read “Safety Information” before using the

meter.

The Fluke 789/787B ProcessMeter(the Meter or

Product) is a handheld, battery-operated tool for

measuring electrical parameters and supplying steady or

ramping current to test process instruments. All

illustrations in this manual show the 789 model.

The 789 adds a 24 V loop power supply. It has all the

features of a digital multimeter, plus current output

capability.

If the meter is damaged or something is missing, contact

the place of purchase immediately. Contact a Fluke

distributor for information about DMM (digital multimeter)

accessories. To order replacement parts or spares, see

Table 13 near the end of this manual.

789/787B

Users Manual

How to Contact Fluke

To contact Fluke, call one of the following telephone

numbers:

•Technical Support USA: 1-800-44-FLUKE

(1-800-443-5853)

•Calibration/Repair USA: 1-888-99-FLUKE

(1-888-993-5853)

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

•Europe: +31 402-675-200

•Japan: +81-3-6714-3114

•Singapore: +65-6799-5566

•Anywhere in the world: +1-425-446-5500

Or, visit Fluke's website at www.fluke.com.

To register your product, visit http://register.fluke.com.

To view, print, or download the latest manual supplement,

visit http://us.fluke.com/usen/support/manuals.

Safety Information

A Warning identifies conditions and procedures that are

dangerous to the user. A Caution identifies conditions and

procedures that can cause damage to the Product or the

equipment under test.

International symbols used on the meter and in this

manual are explained in Table 1.

Warning

To prevent possible electrical shock, fire, or

personal injury:

•Read all safety information before you use the

Product.

•Carefully read all instructions.

•Do not alter the Product and use only as

specified, or the protection supplied by the

Product can be compromised.

•Remove the batteries if the Product is not

used for an extended period of time, or if

stored in temperatures above 50 °C. If the

batteries are not removed, battery leakage

can damage the Product.

ProcessMeter™

Safety Information

•The battery door must be closed and locked

before you operate the Product.

•Replace the batteries when the low battery

indicator shows to prevent incorrect

measurements.

•Comply with local and national safety codes.

Use personal protective equipment (approved

rubber gloves, face protection, and flame-

resistant clothes) to prevent shock and arc

blast injury where hazardous live conductors

are exposed.

•Do not apply more than the rated voltage,

between the terminals or between each

terminal and earth ground.

•Do not work alone.

•Limit operation to the specified measurement

category, voltage, or amperage ratings.

•Use Product-approved measurement category

(CAT), voltage, and amperage rated

accessories (probes, test leads, and adapters)

for all measurements.

•Measure a known voltage first to make sure

that the Product operates correctly.

•Use the correct terminals, function, and range

for measurements.

•Do not touch voltages > 30 V ac rms, 42 V ac

peak, or 60 V dc.

•Do not use the Product around explosive gas,

vapor, or in damp or wet environments.

•Do not use the Product if it operates

incorrectly.

•Examine the case before you use the Product.

Look for cracks or missing plastic. Carefully

look at the insulation around the terminals.

•Do not use test leads if they are damaged.

Examine the test leads for damaged

insulation, exposed metal, or if the wear

indicator shows. Check test lead continuity.

789/787B

Users Manual

•Keep fingers behind the finger guards on the

probes.

•Only use probes, test leads, and accessories

that have the same measurement category,

voltage, and amperage ratings as the Product.

•Remove all probes, test leads, and

accessories before the battery door is

opened.

•Remove all probes, test leads, and

accessories that are not necessary for the

measurement.

•Do not exceed the Measurement Category

(CAT) rating of the lowest rated individual

component of a Product, probe, or accessory.

•Do not use test leads if they are damaged.

Examine the test leads for damaged

insulation and measure a known voltage.

•Do not use a current measurement as an

indication that a circuit is safe to touch. A

voltage measurement is necessary to know if

a circuit is hazardous.

•Do not use the Product if it is altered or

damaged.

•Do not use in CAT III or CAT IV environments

without the protective cap installed on test

probe. The protective cap decreases the

exposed probe metal to <4 mm. This

decreases the possibility of arc flash from

short circuits.

ProcessMeter™

Safety Information

Table 1. International Symbols

Symbol Description Symbol Description

WARNING. RISK OF DANGER. WARNING. HAZARDOUS VOLTAGE. Risk

of electric shock.

Consult user documentation. Conforms to relevant South Korean EMC

Standards

Conforms to European Union directives Minimum fuse interrupt rating.

Certified by CSA Group to North American safety

standards. Conforms to relevant Australian Safety and

EMC standards.

AC (Alternating Current) Earth

DC (Direct Current) Fuse

Battery Double Insulated

Measurement Category II is applicable to test and measuring circuits connected directly to utilization points

(socket outlets and similar points) of the low-voltage MAINS installation.

Measurement Category III is applicable to test and measuring circuits connected to the distribution part of the

building’s low-voltage MAINS installation.

Measurement Category IV is applicable to test and measuring circuits connected at the source of the building’s

low-voltage MAINS installation.

This product complies with the WEEE Directive marking requirements. The affixed label indicates that you must not

discard this electrical/electronic product in domestic household waste. Product Category: With reference to the

equipment types in the WEEE Directive Annex I, this product is classed as category 9 "Monitoring and Control

Instrumentation" product. Do not dispose of this product as unsorted municipal waste.

789/787B

Users Manual

How to Get Started

Warning

To prevent possible electrical shock, fire, or

personal injury:

•Disconnect power and discharge all high-

voltage capacitors before you measure

resistance, continuity, capacitance, or a diode

junction.

•Remove circuit power before you connect the

Product in the circuit when you measure

current. Connect the Product in series with

the circuit.

•Do not use the HOLD function to measure

unknown potentials. When HOLD is turned

on, the display does not change when a

different potential is measured.

If familiar with the Fluke 80 Series DMM, read “Using the

Current Output Functions,” review the tables and figures in

“Getting Acquainted with the Meter,” and begin using the

meter.

If unfamiliar with Fluke 80 Series DMMs, or DMMs in

general, read “Measuring Electrical Parameters” in

addition to the sections referenced in the previous

paragraph.

The sections following “Using the Current Output

Functions” contain information about the power-up options,

and battery and fuse replacement instructions.

See Table 2 for an overview of the meter.

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