Fluke 789 User manual

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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i
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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Users Manual
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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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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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789
Users Manual
2
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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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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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 Quick Reference Guide 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
CAT IV
600 V
anw014f.eps
Figure 1. Fluke 789 ProcessMeter
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789
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
CAT IV
600 V
anw001f.eps
Figure 2. Input/Output Jacks
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ProcessMeter™
Getting Acquainted with the Meter
7
Table 2. Input/Output Jacks
Item Jack Measurement Functions Source Current
Function
Simulate Transmitter
Function
A 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.
mA 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.)

V
Input for voltage to 1000 V, Ω,
continuity, and diode test.
COM Common for all measurements. Common for transmitter
simulation to 24 mA. (Use in
series with an external loop
supply.)
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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
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ProcessMeter™
Getting Acquainted with the Meter
9
Table 3. Rotary Function Switch Positions for Measurements
No. Position Function(s) Pushbutton Actions
OFF Meter off
SDefault:
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)
TDefault:
Measure dc V
h
Frequency counter
Same as above
UDefault:
Measure dc mV
h
Frequency counter
Same as above
VDefault: Measure Ω
Gfor continuity
J(Blue) Dtest
Same as above, except diode test has only one range
WHigh 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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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
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ProcessMeter™
Getting Acquainted with the Meter
11
Table 4. Rotary Function Switch Positions for mA Output
No. Position Default Function Pushbutton Actions
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
sets output to 0 %
sets output to 100 %
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

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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6
7
0%
RANGE HOLD
REL
MIN MAX
%STEP COARSE FINE
SpanCheck
Hz
100%
3
2
1
910
8
4 5
anw003f.eps
Figure 5. Pushbuttons
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ProcessMeter™
Getting Acquainted with the Meter
13
Table 6. Pushbuttons
No. Pushbutton Function(s)
KToggles the backlight (low, high, and off)
Span Check

mA Output: Adjusts mA output to 0 % value (4 mA or 0 mA)

Span Check
mA Output: Sets mA output to 100 % value (20 mA)
D
M
% STEP
Measuring: Selects a MIN, MAX, or AVG action
mA Output: Adjusts mA output up to the next higher 25 % step
E
R
COARSE
Measuring: Selects a fixed range (hold for 1 second for auto range)
mA Output: Adjusts output up 0.1 mA
F
H
FINE
Measuring: Toggles AutoHold, or in MIN MAX recording, suspends recording
mA Output: Adjusts output up 0.001 mA
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Table 6. Pushbuttons (cont.)
No. Pushbutton Function(s)
GFINE
h

Measuring: Toggles between frequency counter and voltage measurement functions
mA Output: Adjusts output down 0.001 mA
HJ
(BLUE)
(alternate
function)
Rotary function switch in Wposition and test lead plugged into Acjack: Toggles between
ac and dc ampere measure
Rotary function switch in Vposition: Toggles diode test function (D)
Rotary function switch in OUTPUT Ymonp position: cycles through
•Slow repeating 0 % -100 % - 0 % ramp (mon display)
•Fast repeating 0 % -100 % - 0 % ramp (oon display)
•Slow repeating 0 % -100 % - 0 % ramp in 25 % steps (pon display)
•Fast repeating 0 % - 100 % - 0 % ramp in 25 % steps (pon display)
Rotary function switch in loop supply position
•Switch in/out 250 Ωseries resistor
ICOARSE
r

Measuring: Toggles relative reading (sets a relative zero point)
mA Output: Adjusts output down 0.1 mA
J% STEP
G

Measuring: Toggles between Ωmeasure and continuity functions
mA Output: Adjusts mA output down to the next lower 25 % step
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