Fluke 789 User manual

®
789
ProcessMeter
Users Manual
August 2002 Rev.1, 2/03
© 2002-2003 Fluke Corporation, All rights reserved. Printed in U.S.A.
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
Contacting 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

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Users Manual
ii
Auto Ramping the mA Output.................................................................................... 26
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

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

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Users Manual
iv

v
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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Users Manual
vi

1
ProcessMeter
Introduction
WWarning
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.
Contacting Fluke
To order accessories, receive operating assistance, or get
the location of the nearest Fluke distributor or Service
Center, call:
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]

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Users Manual
2
Address correspondence to:
Fluke Corporation Fluke Europe B.V.
P.O. Box 9090, P.O. Box 1186,
Everett, WA 98206-9090 5602 BD Eindhoven
USA The Netherlands
Orvisit uson the World Wide Web: www.fluke.com
Safety Information
The meter complies with EN61010, ANSI/ISA S82.01-
1994 and CAN/CSA C22.2 No. 1010.1-92 Overvoltage
Category III. Use the meter only as specified in this
manual, otherwise the protection provided by the meter
may be impaired.
A Warning identifies conditions and actions that pose
hazard(s) to the user; a Caution identifies conditions and
actions that may damage the meter or the equipment
under test.
International symbols used on the meter and in this
manual are explained in Table 1.
WWarning
To avoid possible electric shock or personal
injury:
•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.
•Use only type AA batteries, properly
installed in the meter case, to power the
meter.

ProcessMeter
Safety Information
3
•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.
WCaution
To avoid possible damage to meter or to
equipment under test:
•Disconnect the power and discharge all
high-voltage capacitors before testing
resistance or continuity.
•Use the proper jacks, function, and range
for the measurement or sourcing
application.

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Users Manual
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Table 1. International Symbols
Symbol Meaning Symbol Meaning
Alternating current Earth ground
Direct current Fuse
cAlternating or direct current Conforms to European Union directives
Risk of danger. Important information.
See manual. Conforms to relevant Canadian Standards Association directives
Battery TDouble insulated
Listed
950 Z
Meets Underwriters’ Laboratories safety
requirements Inspected and licensed by TÜV Product Services
CAT III Overvoltage (Installation) Category III,
Pollution Degree 2 per EN61010 refers to
the level of Impulse Withstand Voltage
protection provided. Typical locations
include: mains, wall outlets, main
distribution levels connected closer to the
supply system but less than the primary
supply system (CAT IV).
N10140
Conforms to relevant Australian
standards

ProcessMeter
How to Get Started
5
How to Get Started
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.
Later, use the Product Overview to refresh your memory
about the various functions and features that can be used.
mA
mA
mA
mA
mV
V
V
A
LOOP POWER
250
HART
OFF
mA
ACOM V
Rotary
Switch
0%
RANGE HOLD
REL
MIN MAX
%STEP COARSE FINE
SpanCheck
Hz
100%
789
PROCESSMETER
Pushbuttons
Input/Output
Jacks
Display
anw014f.eps
Figure 1. Fluke 789 ProcessMeter

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Users Manual
6
Getting Acquainted with the Meter
To become familiar with the features and functions of the
meter, study the following figures and tables.
•Figure 2 and Table 2 describe the input/output jacks.
•Figure 3 and Table 3 describe the input functions of
the first six rotary function switch positions.
•Figure 4 and Tables 4 and 5 describe the output
functions of the last three rotary function switch
positions.
•Figure 5 and Table 6 describe the functions of the
pushbuttons.
•Figure 6 and Table 7 explain what all the elements of
the display indicate.
13
4
2
mA
ACOM
V
anw001f.eps
Figure 2. Input/Output Jacks

ProcessMeter
Getting Acquainted with the Meter
7
Table 2. Input/Output Jacks
Item Jack Measurement Functions Source Current Function Simulate Transmitter Function
AA cInput for current to 440 mA
continuous. (1 A for up to 30
seconds.) Fused with a 440 mA
fuse.
Output for dc current to 24 mA.
Output for loop power supply.
BmA dInput for current to 30 mA.
Fused with a 440 mA fuse. Common for dc current output to 24 mA. Common for loop power
supply.
Output for transmitter
simulation to 24 mA. (Use in
series with an external loop
supply.)
C
V
Input for voltage to 1000 V, Ω,
continuity, and diode test.
DCOM Common for all measurements. Common for transmitter
simulation to 24 mA. (Use in
series with an external loop
supply.)

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Users Manual
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mA
mA
mA
mA
mV
V
V
A
LOOP POWER
250
HART
OFF
2
3
4
1
6
5
anw002f.eps
Figure 3. Rotary Function Switch Positions for Measurements

ProcessMeter
Getting Acquainted with the Meter
9
Table 3. Rotary Function Switch Positions for Measurements
No. Position Function(s) Pushbutton Actions
AOFF Meter off
BSDefault:
Measure ac V
h
Frequency counter
MSelects a MIN, MAX, or AVG action
RSelects a fixed range (hold 1 second for auto range)
HToggles AutoHold
rToggles relative reading (sets a relative zero point)
CT Default:
Measure dc V
h
Frequency counter
Same as above
DU Default:
Measure dc mV
h
Frequency counter
Same as above
EVDefault: Measure Ω
Gfor continuity
J(Blue) Dtest
Same as above, except diode test has only one range
FW
High test lead in cA: Measure A dc
J(Blue) selects ac
High test lead in dmA: Measure mA
dc
Same as above, except there is only one range for each input
jack position, 30 mA or 1 A

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Users Manual
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mA
mA
mA
mA
mV
V
V
A
LOOP POWER
250
HART
OFF
2
3
1
anw008f.eps
Figure 4. Rotary Function Switch Positions for mA Output

ProcessMeter
Getting Acquainted with the Meter
11
Table 4. Rotary Function Switch Positions for mA Output
No. Position Default Function Pushbutton Actions
A OUTPUT
X
Test leads in
SOURCE:
Source 0 % mA
Test leads in SIMULATE:
Sink 0 % mA
% STEP Xor W: Adjusts output up or down to the next 25 % step
COARSE Xor W: Adjusts output up or down 0.1 mA
FINE Xor W: Adjusts output up or down 0.001 mA
Esets output to 0 %
Fsets output to 100 %
B OUTPUT
Y
monp
Test leads in
SOURCE:
Source repeating
0 % -100 %-0 %
slow ramp (m)
Test leads in SIMULATE:
Sink repeating
0 % -100 %-0 %
slow ramp (m)
J(Blue) cycles through:
•Fast repeating 0 % -100 % - 0 % ramp (oon display)
•Slow repeating 0 % -100 % - 0 % ramp in 25 % steps (non
display)
•Fast repeating 0 % -100 % - 0 % ramp in 25 % steps ( pon
display)
•Slow repeating 0 % -100 % - 0 % ramp (mon display)
Table 5. Rotary Function Switch Position for Loop Supply
No. Position Default Function Pushbutton Actions
C
mA
LOOP POWER
250
HART
Test leads in SOURCE:
Supply > 24 V loop power, measure mA
J(Blue) cycles through:
•250 Ωseries resistor for HART
communication switched in
•250 Ωseries resistor switched out

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Users Manual
12
6
7
0%
RANGE HOLD
REL
MIN MAX
%STEP COARSE FINE
SpanCheck
Hz
100%
3
2
1910 8
4 5
anw003f.eps
Figure 5. Pushbuttons