Fluke 789 Manuale utente
789
ProcessMeter™
Users Manual
August 2002 Rev. 3, 3/13
© 2002-2013 Fluke Corporation, All rights reserved. Specifications are subject to change without notice.
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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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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1
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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Users Manual
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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
3
•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
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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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