Fluke ProcessMeter 789 User Manual

August 2002 Rev. 3, 3/13

Fluke-Direct

© 2002-2013 Fluke Corporation, All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.

789

ProcessMeter™

Users Manual

.com

[e-mail]

Fluke-Direct

This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This war­ranty 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 authoriza­tion 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

LIMITED WARRANTY AND LIMITATION OF LIABILITY

.com

[e-mail]

Fluke-Direct

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

i

Table of Contents

.com

[e-mail]

789

Fluke-Direct

Users Manual

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

ii

.com

[e-mail]

Fluke-Direct

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

iii

List of Tables

.com

[e-mail]

Fluke-Direct

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

v

List of Figures

.com

[e-mail]

ProcessMeter

Fluke-Direct

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

.

1

.com

[e-mail]

789

Fluke-Direct

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.

2

• 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.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

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.

3

• 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.

.com

[e-mail]

789

Fluke-Direct

Users Manual

Symbol Meaning Symbol Meaning













CAT II

CAT III

CAT IV



4

Table 1. International Symbols

Risk of danger. Important information. See Manual.

Conforms to European Union directives

Meets Underwriters’ Laboratories safety
requirements

Conforms to relevant North American Safety
Standards

Alternating current

Direct current

Battery

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 (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.

 Hazardous voltage

Conforms to relevant South Korean EMC



Standards









Inspected and licensed by TÜV Product
Services

Conforms to relevant Australian Standards

Earth ground



Fuse

Double insulated

.com

[e-mail]

ProcessMeter™

Fluke-Direct

How to Get Started

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.

5

Display

Rotary
Switch

100%

SpanCheck

OFF

A

PROCESSMETER

789

MIN MAX

%STEP

0%

mV

V

V

mA

Figure 1. Fluke 789 ProcessMeter

RANGE HOLD

COARSE

REL

mA

mA

LOOP POWER

COM

CAT IV

600 V

Pushbuttons

FINE

Hz

A

mA

mA

250
HART

Input/Output

V

Jacks

anw014f.eps

.com

[e-mail]

789

Fluke-Direct

Users Manual

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.

1

A

2

6

mA

Figure 2. Input/Output Jacks

• 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.

COM

CAT IV

600 V

V

3

4

anw001f.eps

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Getting Acquainted with the Meter

Table 2. Input/Output Jacks

Item Jack Measurement Functions

 A c

 mA d



 COM

7

Input for current to 440 mA
continuous. (1 A for up to 30
seconds.) Fused with a 440 mA
fuse.

Input for current to 30 mA.
Fused with a 440 mA fuse.

Input for voltage to 1000 V, Ω,

V

continuity, and diode test.

Common for all measurements.

Source Current

Function

Output for dc current to 24 mA.
Output for loop power supply.

Common for dc current output to
24 mA. Common for loop power
supply.

Common for transmitter

Simulate Transmitter

Function

Output for transmitter
simulation to 24 mA. (Use in
series with an external loop
supply.)

simulation to 24 mA. (Use in
series with an external loop
supply.)

.com

[e-mail]

789

Fluke-Direct

Users Manual

4

3

2

OFF

1

Figure 3. Rotary Function Switch Positions for Measurements

8

mV

V

V

mA

A

mA

mA

250
HART

mA

LOOP POWER

5

6

anw002f.eps

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Getting Acquainted with the Meter

Table 3. Rotary Function Switch Positions for Measurements

No. Position Function(s) Pushbutton Actions

 OFF
 S



T



U

Meter off

Default:
Measure ac V

h

Frequency counter

Default:
Measure dc V

h

Frequency counter
Default:
Measure dc mV

M Selects a MIN, MAX, or AVG action
R Selects a fixed range (hold 1 second for auto range)
H Toggles AutoHold
r Toggles relative reading (sets a relative zero point)

Same as above

Same as above

h

Frequency counter



V

Default: Measure Ω

Same as above, except diode test has only one range

G for continuity

J (Blue) D test



9

High test lead in cA: Measure A dc

W

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

.com

[e-mail]

789

Fluke-Direct

Users Manual

10

mV

V

V

OFF

Figure 4. Rotary Function Switch Positions for mA Output

mA

A

mA

mA

250
HART

mA

LOOP POWER

1

2

3

anw008f.eps

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Getting Acquainted with the Meter

Table 4. Rotary Function Switch Positions for mA Output

No. Position Default Function Pushbutton Actions

 OUTPUT

X

OUTPUT



Y
monp

No. Position Default Function Pushbutton Actions



mA

LOOP POWER

Test leads in
SOURCE:

Source 0 % mA

Test leads in SIMULATE:

Sink 0 % mA

Test leads in
SOURCE:

Source repeating
0 % -100 %-0 %
slow ramp (m)

Test leads in SIMULATE:

Sink repeating
0 % -100 %-0 %
slow ramp (m)

Table 5. Rotary Function Switch Position for Loop Supply

250
HART

Test leads in SOURCE:

Supply > 24 V loop power, measure mA

% STEP X or W: Adjusts output up or down to the next 25 % step
COARSE X or W: Adjusts output up or down 0.1 mA
FINE X or W: Adjusts output up or down 0.001 mA

 sets output to 0 %
 sets output to 100 %

J (Blue) cycles through:

• Fast repeating 0 % -100 % - 0 % ramp (o on display)

• Slow repeating 0 % -100 % - 0 % ramp in 25 % steps (n on

display)

• Fast repeating 0 % -100 % - 0 % ramp in 25 % steps ( pon

display)

• Slow repeating 0 % -100 % - 0 % ramp (m on display)

J (Blue) cycles through:

• 250 Ω series resistor for HART

communication switched in

• 250 Ω series resistor switched out

11

.com

[e-mail]

789

Fluke-Direct

Users Manual

12

3

2

4 5

MIN MAX

100%

SpanCheck

1

%STEP

0%

Figure 5. Pushbuttons

RANGE HOLD

COARSE

REL

910

FINE

Hz

8

6

7

anw003f.eps

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Getting Acquainted with the Meter

Table 6. Pushbuttons

No. Pushbutton Function(s)

 K Toggles the backlight (low, high, and off)
 Span Check

mA Output: Adjusts mA output to 0 % value (4 mA or 0 mA)



 

Span Check

D

E

F

13



M

% STEP



R

COARSE



H

FINE

mA Output: Sets mA output to 100 % value (20 mA)

Measuring: Selects a MIN, MAX, or AVG action
mA Output: Adjusts mA output up to the next higher 25 % step

Measuring: Selects a fixed range (hold for 1 second for auto range)
mA Output: Adjusts output up 0.1 mA

Measuring: Toggles AutoHold, or in MIN MAX recording, suspends recording
mA Output: Adjusts output up 0.001 mA

.com

[e-mail]

789

Fluke-Direct

Users Manual

No. Pushbutton Function(s)

G

H

I

J

14

FINE

h



J

(BLUE)

(alternate

function)

COARSE

r



% STEP

G



Table 6. Pushbuttons (cont.)

Measuring: Toggles between frequency counter and voltage measurement functions
mA Output: Adjusts output down 0.001 mA

Rotary function switch in

ac and dc ampere measure
Rotary function switch in V

Rotary function switch in OUTPUT Ymonp position: cycles through

• Slow repeating 0 % -100 % - 0 % ramp (m on display)

• Fast repeating 0 % -100 % - 0 % ramp (o on display)

• Slow repeating 0 % -100 % - 0 % ramp in 25 % steps (p on display)

• Fast repeating 0 % - 100 % - 0 % ramp in 25 % steps (pon display)

Rotary function switch in loop supply position

• Switch in/out 250 Ω series resistor

Measuring: Toggles relative reading (sets a relative zero point)
mA Output: Adjusts output down 0.1 mA

Measuring: Toggles between Ω measure and continuity functions
mA Output: Adjusts mA output down to the next lower 25 % step

Wposition and test lead plugged into Ac jack: Toggles between

position: Toggles diode test function (D)

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Getting Acquainted with the Meter

11

10

9

8

7

6

5

4

3

2

Figure 6. Elements of the Display

15

1

12

13

14

15

17

16

anw004f.eps

.com

[e-mail]

789

Fluke-Direct

Users Manual

No. Element Meaning

 % (Percentage display)

 OUTPUT

 S

D 

E 

F b

G q

H Numerals

IK lI

J D

K I

L N MAX MINAVG

16

Table 7. Display

Shows the mA measured value or output level in %, in a 0-20 mA or 4-20 mA scale
(change scales with power-up option)

Lights when mA output (source or simulate) is active

Lights in continuity function

Lights when dangerous voltage is present

Lights when relative reading is on

Lights when the battery is low

Lights when the meter is transmitting or receiving over the IR port

Show the input or output value

Lights when AutoHold is on

Lights in diode test function

Lights when MIN MAX recording is held

MIN MAX recording status indicators:

N - MIN MAX recording is on
MAX - the display is showing the maximum-recorded value
MIN - the display is showing the minimum-recorded value
AVG - the display is showing the average value since starting recording (up to
about 40 hours continuous recording time)

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Getting Acquainted with the Meter

Table 7. Display (cont.)

No. Element

M mA, DC, mV, AC, M

N Auto Range

O mo np

P

Q Loop Power

17

or kΩ, kHz

Manual Range

400100030

mV

250 Ω
HART

Show the input or output units and multipliers associated with the numerals

Range status indicators:

Auto Range - autoranging is on
Manual Range - the range is fixed

The number plus the unit and multiplier indicate the active range.

One of these lights in mA ramping or step output (rotary function switch position

Ymo np):

m - slow continuous 0 % - 100 % - 0 % ramping (40 seconds)

o - fast continuous 0 % - 100 % - 0 % ramping (15 seconds)

n - slow ramp in 25 % steps (15 seconds/step)

p - fast ramp in 25 % steps (5 seconds/step)

Lights when 250 Ω series resistance is switched in

Lights when in loop supply mode

Meaning

.com

[e-mail]

789

Fluke-Direct

Users Manual

Measuring Electrical Parameters

The proper sequence for taking measurements follows:

1. Plug the test leads into the appropriate jacks

2. Set the rotary function switch to the desired function

3. Touch the probes to the test points

4. View the results on the LCD display

Input Impedance

For the voltage measurement functions, input impedance
is 10 MΩ. See "Specifications" for more information.

Ranges

A measurement range determines the highest value and
resolution at which the meter can measure. Most meter
measurement functions have more than one range (see
"Specifications").

Make sure the correct range is selected:

• If the range is too low, the display shows OL

(overload).

• If the range is too high, the meter will not be

displaying its most precise measurement.

18

The meter normally selects the lowest range that will
measure the applied input signal (Auto Range showing on
the display). Press R to lock the range. Each time
R is pressed, the meter selects the next higher range.
At the highest range, it returns to the lowest range.

If the range is locked, the meter resumes auto ranging
when it is changed to another measurement function or
when R is pressed and held for 1 second.

Testing Diodes

To test a single diode:

1. Insert the red test lead into the Vjack and
black test lead into the COM jack.

2. Set the rotary function switch to

3. Press J (Blue) so that the D symbol is on the
display.

4. Touch the red probe to the anode and the black
probe to the cathode (side with band or bands). The
meter should indicate the appropriate diode voltage
drop.

5. Reverse the probes. The meter displays OL,
indicating a high impedance.

V.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Measuring Electrical Parameters

6. The diode is good if it passes the tests in steps 4
and 5.

Displaying Minimum, Maximum, and Average

MIN MAX recording stores the lowest and highest
measurements, and maintains the average of all
measurements.

Press M to turn on MIN MAX recording. Readings are
stored until the meter is turned off, switched to another
measurement or source function, or MIN MAX is turned
off. The beeper sounds when a new maximum or
minimum is recorded. Auto power-off is disabled and auto
ranging is turned off during MIN MAX recording.

Press M again to cycle through the MAX, MIN, and
AVG displays. Press and hold M for 1 second to erase
stored measurements and exit.

If MIN MAX recording is on continuously for over 40
hours, minimum and maximum readings are still
recorded, but the displayed average no longer changes.

In MIN MAX recording, press H to suspend recording;
press H again to resume recording.

19

Using AutoHold

Note

MIN MAX recording must be off to use AutoHold.

! Warning

To avoid possible electric shock, do not use
AutoHold to determine if dangerous voltage
is present. AutoHold will not capture
unstable or noisy readings.

Activate AutoHold to freeze the meter's display on each
new stable reading (except in the frequency counter
mode). Press H to activate AutoHold. This feature
allows measurements to be taken in situations in which it
is difficult to look at the display. The meter beeps and
updates the display with each new stable reading.

.com

[e-mail]

789

Fluke-Direct

Users Manual

Compensating for Test Lead Resistance

Use the relative reading feature (Q on the display) to set
the present measurement as a relative zero. A common
use for this feature is to compensate for test lead
resistance when measuring ohms.

Select the Ω measure function, touch the test leads
together, and then press r. Until r is pressed
again, or the meter is switched to another measurement
or source function, the readings on the display will
subtract the lead resistance.

Using the Current Output Functions

The meter provides steady, stepped, and ramped current
output for testing 0-20 mA and 4-20 mA current loops.
Choose source mode, in which the meter supplies the
current, simulate mode, in which the meter regulates

20

current in an externally powered current loop, or loop
supply mode, where the meter powers an external device
and measures the loop current.

Source Mode

Source mode is selected automatically by inserting the
test leads into the SOURCE + and − jacks as shown in
Figure 7. Use source mode whenever it is necessary to
supply current into a passive circuit such as a current loop
with no loop supply. Source mode depletes the battery
faster than simulate mode, so use simulate mode
whenever possible.

The display looks the same in source and simulate
modes. The way to tell which mode is in use is to see
which pair of output jacks is in use.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Using the Current Output Functions

PROCESSMETER

789

40

60

100%

SpanCheck

OFF

A

20

0

RANGE HOLD

MIN MAX

COARSE

%STEP

0%

V

V

FINE

REL

Hz

mV

mA

A

mA

mA

250
HART

mA

LOOP POWER

mA

COM

V

CAT IV
600 V

80

100

Figure 7. Sourcing Current

21

anw010f.eps

.com

[e-mail]

789

Fluke-Direct

Users Manual

Simulate Mode

Simulate mode is so named because the meter simulates
a current loop transmitter. Use simulate mode when an
external dc voltage of 15 to 48 V is in series with the
current loop under test.

Caution

Set the rotary function switch to one of the
mA output settings BEFORE connecting the
test leads to a current loop. Otherwise, a low
impedance from the other rotary function
switch positions could be presented to the
loop, causing up to 35 mA to flow in the loop.

Simulate mode is selected automatically by inserting the
test leads into the SIMULATE + and − jacks as shown in
Figure 8. Simulate mode conserves battery life, so use it
instead of source mode whenever possible.

The display looks the same in source and simulate
modes. The way to tell which mode is in use is to see
which pair of output jacks is in use.

22

Changing the Current Span

The meter’s current output span has two settings (with
overrange to 24 mA):

• 4 mA = 0 %, 20 mA = 100 % (factory default)

• 0 mA = 0 %, 20 mA = 100 %

To find out which span is selected, short the OUTPUT
SOURCE + and − jacks, turn the rotary function switch to
OUTPUT [ mA, and observe the 0 % output level.

To toggle and save the current output span in nonvolatile
memory (retained when the power is turned off):

1. Turn off the meter.

2. Hold down R while turning the meter on.

3. Wait at least 2 seconds, then release R.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Using the Current Output Functions

dc V

Power Supply

COM +24V

100%

SpanCheck

OFF

A

PROCESSMETER

789

RANGE HOLD

MIN MAX

COARSE

%STEP

0%

V

V

FINE

REL

Hz

mV

mA

A

mA

mA

250
HART

mA

LOOP POWER

mA

COM

V

CAT IV

600 V

40

60

20

0

80

100

Figure 8. Simulating a Transmitter

23

anw011f.eps

.com

[e-mail]

789

Fluke-Direct

Users Manual

Producing a Steady mA Output

When the rotary function switch is in the OUTPUT [ mA
position, and the OUTPUT jacks are connected to an
appropriate load, the meter produces a steady mA dc
output. The meter begins sourcing or simulating 0 %. Use
the pushbuttons to adjust the current as shown in Table 8.

Select either sourcing or simulating by choosing the
SOURCE or SIMULATE output jacks.

24

If the meter cannot deliver the programmed current
because the load resistance is too high or the loop supply
voltage is too low, dashes (-----) appear on the numeric
display. When the impedance between the SOURCE jacks
is low enough, the meter will resume sourcing.

Note

The STEP pushbuttons described Table 9 are
available when the meter is producing a steady
mA output. The STEP pushbuttons go to the next
multiple of 25 %.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Using the Current Output Functions

Table 8. mA Output Adjust Pushbuttons

Pushbutton Adjustment

X

R

COARSE

X

M

FINE
FINE

Adjusts up 0.1 mA

Adjusts up 0.001 mA

Adjusts down 0.001 mA

h

W

COARSE

Adjusts down 0.1 mA

r

W

25

Manually Stepping the mA Output

When the rotary function switch is in the OUTPUT [ mA
position, and the OUTPUT jacks are connected to an
appropriate load, the meter produces a steady mA dc
output. The meter begins sourcing or simulating 0 %. Use
the pushbuttons to step the current up and down in 25 %
increments as shown in Table 9. See Table 10 for mA
values at each 25 % step.

Select either sourcing or simulating by choosing the
SOURCE or SIMULATE output jacks.

If the meter cannot deliver the programmed current
because the load resistance is too high or the loop supply
voltage is too low, dashes (-----) appear on the numeric
display. When the impedance between the SOURCE
jacks is low enough, the meter will resume sourcing.

Note

The COARSE and FINE adjustment pushbuttons
described in Table 8 are available when
manually stepping the mA output.

.com

[e-mail]

789

Fluke-Direct

Users Manual

Table 9. mA Stepping Pushbuttons

Pushbutton Adjustment

X

M

% STEP
% STEP

G

W



Span Check
Span Check

Adjusts up to the next higher 25 %
step

Adjusts down to the next lower 25
% step

Sets to 100 % value

Sets to 0 % value



26

Table 10. mA Step Values

Value (for each span setting)

Step 4 to 20 mA 0 to 20 mA

0 % 4.000 mA 0.000 mA

25 % 8.000 mA 5.000 mA

50 % 12.000 mA 10.000 mA

75 % 16.000 mA 15.000 mA

100 % 20.000 mA 20.000 mA

125 % 24.000 mA

120 % 24.000 mA

Auto Ramping the mA Output

Auto ramping gives the ability to continuously apply a
varying current stimulus from the meter to a transmitter,
while hands remain free to test the response of the
transmitter. Select either sourcing or simulating by
choosing the SOURCE or SIMULATE jacks.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Power-Up Options

When the rotary function switch is in the OUTPUT
Ymonp position, and the output jacks are
connected to an appropriate load, the meter produces a
continuously repeating 0 % - 100 % - 0 % ramp in a
choice of four ramp waveforms:

m 0 % - 100 % - 0 % 40-second smooth ramp

(default)

o 0 % - 100 % - 0 % 15-second smooth ramp
n 0 % - 100 % - 0 % Stair-step ramp in 25 % steps,

pausing 15 seconds at each step. Steps listed in
Table 10.

p 0 % - 100 % - 0 % Stair-step ramp in 25 % steps,

pausing 5 seconds at each step. Steps are listed in
Table 10.

The ramp times are not adjustable. Press J (Blue) to
cycle through the four waveforms.

Note

At any time during auto ramping, the ramp can
be frozen simply by moving the rotary function
switch to the [ mA position. Then the COARSE,
FINE, and % STEP adjust pushbuttons can be
used to make adjustments.

27

Power-Up Options

To select a power-up option, hold down the pushbutton
shown in Table 11 while turning the rotary function switch
from OFF to any on position. Wait 2 seconds before
releasing the pushbutton after powering up the meter.
The meter beeps to acknowledge the power-up option.

Only the setting for current span is retained when the
power is turned off. The other options have to be
repeated for each operating session.

Holding down more than one pushbutton can activate
more than one power-up option.

.com

[e-mail]

789

Fluke-Direct

Users Manual

Change current span 0 % setting R Remembers

Disable beeper G Enabled Disables beeper

Disable auto power-off

Display test/show firmware version H Disabled Display HOLD (as long as button is

28

Table 11. Power-Up Options

Option Pushbutton Default Action Taken

Toggles between 0 - 20 mA and 4 - 20 mA
range

power after 30 minutes of inactivity. Auto
power off is disabled regardless of this
option if MIN MAX recording is on.

pushed), then shows firmware version.

J

(Blue)

last setting

Enabled Disables the feature that turns off the meter

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Loop Power Supply Mode

Loop Power Supply Mode

The Loop Power Supply Mode can be used for powering
up a process instrument (transmitter). While in Loop
Power Mode, the meter acts like a battery. The process
instrument regulates the current. At the same time, the
meter measures the current that the process instrument is
drawing.

The meter supplies loop power at a nominal 24 V dc. An
internal series resistance of 250 Ω can be switched in for
communication with HART and other smart devices by
pressing J (Blue). Pressing J (Blue) again switches out
this internal resistance.

When loop power is enabled, the meter is configured to
measure mA and > 24 V dc is sourced between the mA
and A jacks. The mA jack is the common and the A jack is
at > 24 V dc. Connect the meter in series with the
instrument current loop as Figure 10 shows.

32

30

28

26

Voltage (V)

24

22

20

0 4 8 12162024

Loop voltage w/ 250

Figure 9. Loop Power Voltage vs. Current

Current (mA)

Loop voltage w/o 250

anw020f.eps

29

.com

[e-mail]

789

Fluke-Direct

Users Manual

SpanCheck

30

PROCESSMETER

789

RANGE HOLD

MIN MAX

100%

COARSE

%STEP

0%

V

V

OFF

mA

A

FINE

REL

Hz

mV

mA

A

mA

mA

250
HART

mA

LOOP POWER

COM

V

CAT IV
600 V

Red

TEST DC PWR

+–+–

–+

Black

Figure 10. Connections for Supplying Loop Power

anw009f.eps

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Battery Life

Battery Life



Warning

To avoid false readings, which could lead to
possible electric shock or personal injury,
replace the battery as soon as the battery
indicator (b) appears.

Table 12 shows typical alkaline battery life. To preserve
battery life:

• Use current simulation instead of sourcing when
possible.

• Avoid using the backlight.

• Do not disable the automatic power-off feature.

• Turn the meter off when not in use.

Table 12. Typical Alkaline Battery Life

Meter Operation Hours

Measuring any parameter 140
Simulating Current 140
Sourcing 12 mA into 500 Ω 10

31

Maintenance

This section provides some basic maintenance
procedures. Repair, calibration, and servicing not covered
in this manual must be performed by qualified personnel.
For maintenance procedures not described in this manual,
contact a Fluke Service Center.

General Maintenance

Periodically wipe the case with a damp cloth and
detergent; do not use abrasives or solvents.

Calibration

Calibrate the meter once a year to ensure that it performs
according to its specifications. Contact a Fluke Service
Center for instructions.

.com

[e-mail]

789

Fluke-Direct

Users Manual

Replacing the Batteries

! Warning

To avoid electrical shock:

• Remove test leads from the meter before

opening the battery door.

• Close and latch the battery door before

using the meter.

Replace the batteries as follows. Refer to Figure 11. Use
four AA alkaline batteries.

1. Remove the test leads and turn the meter OFF.

32

2. With a standard blade hand screwdriver, turn each
battery door screw counterclockwise so that the slot is
parallel with the screw picture molded into the case.

3. Lift off the battery door.

4. Remove the meter's batteries.

5. Replace with four new AA alkaline batteries.

6. Reinstall the battery door and tighten screws.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

General Maintenance

F1

F2

Figure 11. Replacing the Batteries and Fuses

33

anw037.eps

.com

[e-mail]

789

Fluke-Direct

Users Manual

Replacing a Fuse

! Warning

To avoid personal injury or damage to the
meter, use only the specified replacement
fuse, 440 mA 1000 V fast-blow, Fluke PN

943121.

Both current input jacks are fused with separate 440 mA
fuses. To determine if a fuse is blown:

1. Turn the rotary function switch to

2. Plug the black test lead into COM, and the red test
lead into the A c input.

3. Using an ohmmeter, check the resistance between
the meter test leads. If the resistance is about 1 Ω,
the fuse is good. An open reading means that fuse
F1 is blown.

4. Move red test lead to .

5. Using an ohmmeter, check the resistance between
the meter test leads. If the resistance is about 14 Ω,
the fuse is good. An open means that fuse F2 is
blown.

34

W.

If a fuse is blown, replace it as follows. Refer to Figure 11
as necessary:

1. Remove the test leads from the meter and turn the
meter OFF.

2. With a standard blade hand screwdriver, turn each
battery door screw counterclockwise so that the slot
is parallel with the screw picture molded into the
case.

3. Remove either fuse by gently prying one end loose,
then sliding the fuse out of its bracket.

4. Replace the blown fuse(s).

5. Replace the battery access door. Secure the door by
turning the screws one-quarter turn clockwise.

If the Meter does not Work

• Examine the case for physical damage. If there is
damage, make no further attempt to use the meter,
and contact a Fluke Service Center.

• Check the battery, fuses, and test leads.

• Review this manual to make sure you are using the

correct jacks and rotary function switch position.

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Replacement Parts and Accessories

If the meter still does not work, contact a Fluke Service
Center. If the meter is under warranty, it will be repaired
or replaced (at Fluke’s option) and returned at no charge.
See the Warranty on the back of the title page for terms. If
the warranty has lapsed, the meter will be repaired and
returned for a fixed fee. Contact a Fluke Service Center
for information and price.

35

Replacement Parts and Accessories

! Warning

To avoid personal injury or damage to the
meter, use only the specified replacement
fuse, 440 mA 1000 V fast-blow, Fluke PN

943121.

Note

When servicing the meter, use only the
replacement parts specified here.

Replacement parts and some accessories are shown in
Figure 12 and listed in Table 13. Many more DMM
accessories are available from Fluke. For a catalog,
contact the nearest Fluke distributor.

To find out how to order parts or accessories use the
telephone numbers or addresses shown in "Contacting
Fluke".

.com

[e-mail]

789

Fluke-Direct

Users Manual

36

1

3

8

4

5

6

7

9

10

Figure 12. Replacement Parts

2

17

18

16

15

14

13

12

11

26

20

21

30

29

19

27

22

28

25

24

23

anw005f.eps

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Replacement Parts and Accessories

Table 13. Replacement Parts

Item Number

 MP14 Knob Assembly 658440 1

 MP1 Top Case with Lens Protector 1622855 1

 MP8 Decal, Top Case 1623923 1

D MP6 Keypad 1622951 1

E MP5 Top Shield 1622924 1

F MP47 Top Shield Contact 674853 1

G MP4 Contact Housing 1622913 1

H MP28-31 RSOB Contact 1567683 4

I  F1, F2 Fuse, 440 mA, 1000 V fast-blow 943121 2

J H7,8 PCB Screw 832220 2

K MP9 Bottom Shield 1675171 1

L MP12 IR Lens 658697 1

M MP40,41 LCD Connectors, Elastomeric 1641965 2

N MP7 Backlight/Bracket 1622960 1

O P1 LCD Display 1883431 1

P MP3 Mask 1622881 1

37

Reference

Designator

Description Fluke PN or Model no. Quantity

.com

[e-mail]

789

Fluke-Direct

Users Manual

Item Number

Q MP50 Shock Absorber 878983 1
R MP11 Bottom Case 659042 1
S MP20 Battery Contact, Negative 658382 1
T BT1-4 Battery, 1.5 V, 0-15 mA, AA Alkaline 376756 4
U H1-2 Fasteners, Battery/Fuse Access Door 948609 2
V MP13 Tilt-Stand 659026 1
W MP15 Accessory Mount with Probe Holders 658424 1
X MP2 Access Door, Battery/Fuse 1622870 1
Y MP46 Shock Absorber 674850 1
Z MP16-18 Battery Contacts Dual 666435 3
a MP19 Battery Contact, Positive 666438 1
b H3-6 Case Screws 1558745 4
c MP21 Calibration Label 948674 1
d MP22 Calibration Keypad 658689 1

- Not shown Test Leads variable

- Not shown Alligator Clips variable

- Not shown 789 Quick Reference 4276679 1

- Not shown CD-ROM (Contains Users Manual) 1636493 1
[1] See www.fluke.com for more information about the test leads and alligator clips available for your region.

38

Reference

Designator

Table 13. Replacement Parts (continued)

Description Fluke PN or Model no. Quantity

[1]

1 (set of 2)

[1]

1 (set of 2)

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Specifications

Specifications

All specifications apply from +18 °C to +28 °C unless
stated otherwise.

All specifications assume a 5-minute warm-up period.

DC Volts Measurement

Range (V dc) Resolution Accuracy, ±(% of Reading + Counts)

4.000 0.001 V 0.1 % + 1

40.00 0.01 V 0.1 % + 1

400.0 0.1 V 0.1 % + 1

1000 1 V 0.1 % + 1

Input impedance: 10 MΩ (nominal), < 100 pF
Normal mode rejection ratio: > 60 dB at 50 Hz or 60 Hz
Common mode rejection ratio: > 120 dB at dc, 50 Hz, or 60 Hz
Overvoltage protection: 1000 V

39

The standard specification interval is 1 year.

Note

“Counts” refers to the number of increments or
decrements of the least significant digit.

.com

[e-mail]

789

Fluke-Direct

Users Manual

DC Millivolts Measurement

Range (mV dc) Resolution Accuracy, ±(% of Reading + Counts)

AC Volts Measurement

Range (ac) Resolution

Specifications are valid from 5 % to 100 % of amplitude range.
AC conversion: true rms
Maximum crest factor: 3 (between 50 and 60 Hz)
For non-sinusoidal waveforms, add
Input impedance: 10 M
Common mode rejection ratio: > 60 dB at dc, 50 Hz, or 60 Hz
In an RF field of 3 V/m, add 0.25 % of range

40

400.0 0.1 mV 0.1 % + 2

Accuracy, ±(% of Reading + Counts)

50 Hz to 60 Hz 45 Hz to 200 Hz 200 Hz to 500 Hz

400.0 mV 0.1 mV 0.7 % + 4 1.2 % + 4 7.0 % + 4

4.000 V 0.001 V 0.7 % + 2 1.2 % + 4 7.0 % + 4

40.00 V 0.01 V 0.7 % + 2 1.2 % + 4 7.0 % + 4

400.0 V 0.1 V 0.7 % + 2 1.2 % + 4 7.0 % + 4

1000 V 1 V 0.7 % + 2 1.2 % + 4 7.0 % + 4

±

Ω

(nominal), < 100 pF, ac-coupled

(2 % reading + 2 % f.s.) typical

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Specifications

AC Current Measurement

Range

45 Hz to 2 kHz

1.000 A (Note) 0.001 A 1 % + 2 1.5 V/A

Note: 440 mA continuous, 1 A 30 seconds maximum

Specifications are valid from 5 % to 100 % of amplitude range.
AC conversion: true rms
Maximum crest factor: 3 (between 50 and 60 Hz)
For non-sinusoidal waveforms, add
Overload protection 440 mA, 1000 V fast-blow fuse

DC Current Measurement

Range Resolution Accuracy, ±(% of Reading + Counts)

30.000 mA 0.001 mA 0.05 % + 2 14 mV/mA

1.000 A (Note) 0.001 A 0.2 % + 2 1.5 V/A

Note: 440 mA continuous, 1 A 30 seconds maximum

Overload protection: 440 mA, 1000 V fast-blow fuse
In an RF field of 3 V/m, in 30.000 mA range, add 0.14 % of range

41

Resolution Accuracy, ±(% of Reading + Counts)

±

( 2 % reading + 2 % f.s.) typical

Typical Burden

Voltage

Typical Burden

Voltage

.com

[e-mail]

789

Fluke-Direct

Users Manual

Ohms Measurement

400.0 Ω 0.1 Ω 220 μA 0.2 % + 2

4.000 kΩ 0.001 kΩ 60 μA 0.2 % + 1

40.00 kΩ 0.01 kΩ 6.0 μA 0.2 % + 1

400.0 kΩ 0.1 kΩ 600 nA 0.2 % + 1

4.000 MΩ 0.001 MΩ 220 nA 0.35 % + 3

40.00 MΩ 0.01 MΩ 22 nA 2.5 % + 3

Overload protection: 1000 V
Open circuit voltage: <3.9 V

42

Range Resolution Measurement Current Accuracy, ±(% of Reading + Counts)

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Specifications

Frequency Counter Accuracy

Range Resolution Accuracy, ±(% of Reading + Counts)

199.99 Hz 0.01 Hz 0.005 % + 1

1999.9 Hz 0.1 Hz 0.005 % + 1

19.999 kHz 0.001 kHz 0.005 % + 1

Display updates 3 times/second at > 10 Hz

Frequency Counter Sensitivity

Minimum Sensitivity (rms Sinewave)

Input Range

400 mV 150 mV (50 Hz to 5 kHz) 150 mV

4 V 1 V 1 V

40 V 4 V 4 V

400 V 40 V 40 V

1000 V 400 V 400 V

*Usable 0.5 Hz to 20 kHz with reduced sensitivity.

6

10

VHz max

43

AC

5 Hz to 5 kHz*

DC

(approximate trigger level 5 % of full scale)

.com

[e-mail]

789

Fluke-Direct

Users Manual

Diode Test and Continuity Test

Diode test indication ........................................... Displays voltage drop across device, 2.0 V full scale. Nominal test current 0.2 mA at

Continuity test indication ..................................... Continuous audible tone for test resistance <100 Ω

Open circuit voltage ............................................ 2.9 V

Short circuit current ............................................. 220 μA typical

Overload protection ............................................. 1000 V rms

Loop Power Supply Voltage ................................. 24 V, Short Circuit protected

DC Current Output

Source mode:

Simulate Mode

0.6 V. Accuracy ±(2 % + 1 count).

Span .............................................................. 0 mA or 4 mA to 20 mA, with overrange to 24 mA

Accuracy ....................................................... 0.05 % of span

Compliance voltage ...................................... 28 V with battery voltage >~4.5 V

[1] In an RF field of 3 V/m, add 0.32 % of span

Span .............................................................. 0 mA or 4 mA to 20 mA, with overrange to 24 mA

Accuracy ....................................................... 0.05 % of span

Loop voltage ................................................. 24 V nominal, 48 V maximum, 15 V minimum

Compliance voltage ...................................... 21 V for 24 V supply

Burden voltage .............................................. <3 V

[1]

1

44

.com

[e-mail]

ProcessMeter™

Fluke-Direct

Specifications

General Specifications

Maximum voltage applied between

any jack and earth ground .................................... 1000 V

Battery Type ........................................................... 1.5 V, 0-15 mA, AA, Alkaline

Storage temperature ............................................. -40 °C to 60 °C

Operating temperature .......................................... -20 °C to 55 °C

Operating altitude .................................................. 2000 meters maximum

Frequency Overload Protection

Temperature coefficient ........................................ 0.05 x specified accuracy per °C for temperatures <18 °C or >28 °C

Relative humidity ................................................... 95 % up to 30 °C, 75 % up to 40 °C, 45 % up to 50 °C, and 35 % up to 55 °C

Vibration ................................................................. Random 2g, 5 to 500 Hz

Shock ...................................................................... 1 meter drop test

Power requirements .............................................. Four AA batteries (alkaline recommended)

Size ......................................................................... 10.0 cm X 20.3 cm X 5.0 cm (3.94 in X 8.00 in X 1.97 in)

Weight .................................................................... 610 g (1.6 lb)

Safety ...................................................................... IEC 61010-1: 600 V CAT IV / 1000 V CAT III, Pollution Degree 2

Electromagnetic Environment .............................. IEC 61326-1: Portable

Electromagnetic Compatibility ............................. Accuracy for all ProcessMeter functions is not specified in RF field > 3V/m

Applies to use in Korea only ................................ Class A Equipment (Industrial Broadcasting & Communication Equipment

[1] This product meets requirements for industrial (Class A) electromagnetic wave equipment and the seller or user should take notice of

it. This equipment is intended for use in business environments and not to be used in homes.

....................... 106 V Hz max

0.1 x specified accuracy per °C for temperatures <18 °C or >28 °C

[1]

45

.com

[e-mail]