Fluke 789 User manual

789/787B
ProcessMeter™
Users Manual
August 2002, Rev. 4, 1/17
© 2002-2017 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
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

i
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
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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

1
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
2
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: [phone]
•Japan: [phone]
•Singapore: [phone]
•Anywhere in the world: [phone]
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
3
•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
4
•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
5
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
6
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.