Fluke 789 Manual de usuario

789

ProcessMeter™

Users Manual

August 2002 Rev. 3, 3/13

All product names are trademarks of their respective companies.

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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.

11/99

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Table of Contents

Title Page

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

How to Contact Fluke ..................................................................................................... 1

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

How to Get Started......................................................................................................... 5

Getting Acquainted with the Meter ................................................................................. 6

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

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Power-Up Options ......................................................................................................... 27

Loop Power Supply Mode.............................................................................................. 29

Battery Life..................................................................................................................... 31

Maintenance .................................................................................................................. 31

General Maintenance..................................................................................................... 31

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

Replacing a Fuse ...................................................................................................... 34

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

Replacement Parts and Accessories ............................................................................. 35

Specifications................................................................................................................. 39

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iii

List of Tables

Table Title Page

1. International Symbols............................................................................................................ 4

2. Input/Output Jacks................................................................................................................. 7

3. Rotary Function Switch Positions for Measurements ............................................................ 9

4. Rotary Function Switch Positions for mA Output................................................................... 11

5. Rotary Function Switch Position for Loop Supply.................................................................. 11

6. Pushbuttons .......................................................................................................................... 13

7. Display................................................................................................................................... 16

8. mA Output Adjust Pushbuttons ............................................................................................. 25

9. mA Stepping Pushbuttons ..................................................................................................... 26

10. mA Step Values..................................................................................................................... 26

11. Power-Up Options ................................................................................................................. 28

12. Typical Alkaline Battery Life .................................................................................................. 31

13. Replacement Parts................................................................................................................ 37

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List of Figures

Figure Title Page

1. Fluke 789 ProcessMeter........................................................................................................ 5

2. Input/Output Jacks................................................................................................................. 6

3. Rotary Function Switch Positions for Measurements ............................................................ 8

4. Rotary Function Switch Positions for mA Output................................................................... 10

5. Pushbuttons .......................................................................................................................... 12

6. Elements of the Display......................................................................................................... 15

7. Sourcing Current ................................................................................................................... 21

8. Simulating a Transmitter........................................................................................................ 23

9. Loop Power Voltage vs. Current............................................................................................ 29

10. Connections for Supplying Loop Power................................................................................. 30

11. Replacing the Batteries and Fuses........................................................................................ 33

12. Replacement Parts................................................................................................................ 36

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ProcessMeter

Introduction

Warning

Read “Safety Information” before using the

meter.

The Fluke 789 ProcessMeter(referred to as “the meter”)

is a handheld, battery-operated tool for measuring

electrical parameters, supplying steady or ramping current

to test process instruments, and providing 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.

How to Contact Fluke

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789

Users Manual

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 “Safety Information” before using the

meter.

•Do not use the meter if it is damaged. Before

using the meter, inspect the case. Look for

cracks or missing plastic. Pay particular

attention to the insulation surrounding the

connectors.

•Make sure the battery door is closed and

latched before operating the meter.

•Remove test leads from the meter before

opening the battery door.

•Inspect the test leads for damaged insulation or

exposed metal. Check test lead continuity.

Replace damaged test leads before using the

meter.

•Do not use the meter if it operates abnormally.

Protection may be impaired. When in doubt,

have the meter serviced.

•Do not operate the meter around explosive gas,

vapor, or dust.

•Do not use in a damp or wet environment.

•Use only type AA batteries, properly installed in

the meter case, to power the meter.

•When servicing the meter, use only specified

replacement parts.

•Use caution when working above 30 V ac rms,

42 V ac pk, or 60 V dc. Such voltages pose a

shock hazard.

•When using the probes, keep fingers behind the

finger guards on the probes.

•Connect the common test lead before

connecting the live test lead. When

disconnecting test leads, disconnect the live

test lead first.

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ProcessMeter™

Safety Information

•Do not use AutoHold to determine if dangerous

voltage is present. AutoHold will not capture

unstable or noisy readings.

•To avoid false readings, which could lead to

possible electric shock or personal injury,

replace the battery as soon as the battery

indicator () appears.

•Remove test leads from the meter before

opening the battery door.

•Close and latch the battery door before using

the meter.

•To avoid personal injury or damage to the

meter, use only the specified replacement fuse,

440 mA 1000 V fast-blow, Fluke PN 943121.

•Do not exceed the Measurement Category (CAT)

rating of the lowest rated individual component

of a product, probe, or accessory.

•Do not use the TL175 or TP175 test probes in

CAT III or CAT IV environments without the

probe tip fully extended and correct category

rating visible in the window.

•When the TL175 is used with instruments or

other accessories, the lowest category rating of

the combination applies. One exception is when

the probe is used with the AC172 or AC175.

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789

Users Manual

Table 1. International Symbols

Symbol Meaning Symbol Meaning

Risk of danger. Important information. See Manual. Hazardous voltage

Conforms to European Union directives Conforms to relevant South Korean EMC

Standards

Meets Underwriters’ Laboratories safety

requirements Inspected and licensed by TÜV Product

Services

Conforms to relevant North American Safety

Standards Conforms to relevant Australian Standards

Alternating current Earth ground

Direct current Fuse

Battery Double insulated

CAT II 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.

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

the building’s low-voltage MAINS installation.

CAT IV 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 (2002/96/EC) 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. Go to Fluke’s website for recycling information.

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