Fluke 787 User Manual

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787

ProcessMeter

Users Manual

April 1997, Rev.3, 12/01

LIMITED WARRANTY & LIMITATION OF LIABILITY

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 disposable batteries or damage from accident, neglect, misuse 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, send your defective meter to the nearest Fluke Authorized 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 Fluke Europe B.V. P.O. Box 9090 P.O. Box 1186 Everett, WA 5602 B.D. Eindhoven 98206-9090 USA The Netherlands

Title Page

Introduction....................................................................................................................1

Contacting Fluke ........................................................................................................... 1

Safety Information......................................................................................................... 2

How to Get Started........................................................................................................ 5

Getting Acquainted with the Meter................................................................................ 6

Measuring Electrical Parameters................................................................................... 17

Input Impedance....................................................................................................... 17

Ranges..................................................................................................................... 17

Measuring a Composite Signal................................................................................. 17

Testing Diodes.......................................................................................................... 18

Displaying Minimum, Maximum, and Average.......................................................... 18

Using TouchHold...................................................................................................... 19

Compensating for Test Lead Resistance.................................................................. 19

Using the Current Output Functions .............................................................................. 20

Source Mode............................................................................................................ 20

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Simulate Mode.......................................................................................................... 22

Changing the Current Span ...................................................................................... 22

Producing a Steady mA Output................................................................................. 24

Manually Stepping the mA Output ............................................................................ 25

Auto Ramping the mA Output................................................................................... 26

Power-Up Options.......................................................................................................... 27

Battery Life..................................................................................................................... 28

Using the Holster and Flex-Stand.................................................................................. 28

Maintenance.................................................................................................................. 28

General Maintenance................................................................................................ 28

Calibration................................................................................................................. 28

Replacing the Battery................................................................................................ 30

Replacing a Fuse...................................................................................................... 31

If the Meter does not Work........................................................................................ 32

Replacement Parts and Accessories............................................................................. 33

Specifications................................................................................................................. 36

Index

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Introduction

WWarning

Read “Safety Information” before you use the meter.

Your Fluke 787 ProcessMeter (referred to as “the meter”) is a handheld, battery-operated tool for measuring electrical parameters and supplying steady or ramping current to test process instruments. It has all the features of a digital multimeter, plus current output capability.

Your meter is shipped with a Flex-Stand holster, one set of TL75 test leads, one set of AC70A Alligator Clips, this manual, and a laminated Quick Reference Card that fits inside the holster.

If the meter is damaged or something is missing, contact the place of purchase immediately.

Contact your Fluke distributor for information about DMM 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: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-5500

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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

Or visit us on the World Wide Web: www.fluke.com

Safety Information

The meter complies with IEC1010-1, ANSI/ISA S82.011994 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 you use the meter, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors.

ProcessMeter

Safety Information

• Make sure the battery door is closed and

latched before you operate the meter.

• Remove test leads from the meter before

you open the battery door.

• Inspect the test leads for damaged

insulation or exposed metal. Check test leads continuity. Replace damaged test leads before you use 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 a single 9V battery, properly

installed in the meter case, to power the meter.

• When servicing the meter, use only

specified replacement parts.

Caution

To avoid possible damage to meter or to equipment under test:

Disconnect the power and discharge all highvoltage capacitors before testing resistance or continuity.

Use the proper jacks, function, and range for your measurement or sourcing application.

To protect yourself, adhere to the following guidelines:

• Use caution when working above 30V ac rms, 42V ac pk, or 60V dc. Such voltages pose a shock hazard.

• When using the probes, keep your fingers behind the finger guards on the probes.

• Connect the common test lead before you connect the live test lead. When you disconnect test leads, disconnect the live test lead first.

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Table 1. International Symbols

Symbol Meaning Symbol Meaning

Alternating current Earth ground

Direct current Fuse

CAT III

Alternating or direct current Conforms to European Union directives Refer to the manual for information about

this feature. Battery

Meets Underwriters’ Laboratories safety requirements

Overvoltage (Installation) Category III, Pollution Degree 2 per IEC1010-1 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).

Conforms to relevant Canadian Standards Association directives

Double insulated

Inspected and licensed by TÜV Product Services

How to Get Started

ProcessMeter

How to Get Started

If you are 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 your meter.

If you are 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 Card to refresh your memory about the various functions and features that you can use.

Display

Rotary Switch

PROCESSMETER

787

REL Hz

COM

CAT

1000V

OUTPUT

MIN MAX RANGE HOLD

% STEP COARSE FINE

OFF

OUTPUT 0-24mA

SOURCE SIMULATE

+ +

0.44A

(1A/ 30 sec)

FUSED

30mA

FUSED

Figure 1. Fluke 787 ProcessMeter

Pushbuttons

Input/Output Jacks

ee014f.eps

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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 and Table 2 describe the input/output jacks.

• Figure and Table 3 describe the input functions you

get with the first five rotary switch positions.

OUTPUT 0-24mA

SOURCE SIMULATE

+ +

0.44A

(1A/30 sec)

FUSED

Figure 2. Input/Output Jacks

• Figure and Table 4 describe the output functions you get with the last two rotary switch positions.

• Figure and Table 5 describe the functions of the pushbuttons.

• Figure and Table 6 explain what all the elements of the display indicate.

30mA

FUSED

COM

CAT

1000V

ee001f.eps

Table 2. Input/Output Jacks

ProcessMeter

Getting Acquainted with the Meter

Item Jack Measurement Functions Source Current

Function

A c A

B d mA

D COM

Input for current to 440 mA continuous. (1A 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 1000V, Ω, continuity, and diode test.

Common for all measurements.

Output for dc current to 24 mA.

Common for dc current output to 24 mA.

Simulate Transmitter

Function

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

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

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OUTPUT

OFF

Figure 3. Rotary Switch Positions for Measurements

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Getting Acquainted with the Meter

Table 3. Rotary Switch Positions for Measurements

No. Position Function(s) Pushbutton Actions

ProcessMeter

A OFF B V A

C d V D d mV

E O

F mA A L

Meter off Default:

measure ac V

Frequency counter Measure dc V Same as above Measure dc mV Same as above Default: measure Ω

T for continuity BLUE D test

High test lead in

cA: measure A dc BLUE selects ac

M Selects a MIN, MAX, or AVG action (see pg. 18) KSelects a fixed range (hold 1 second for auto range) I Toggles TouchHold C Toggles relative reading (sets a relative zero point)

Same as above, except diode test has only one range

Same as above, except there is only one range for each input jack position, 30 mA or 1A

High test lead in

dmA: measure mA dc

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OUTPUT

OFF

Figure 4. Rotary Switch Positions for mA Output

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Getting Acquainted with the Meter

Table 4. Rotary Switch Positions for mA Output

No. Position Default Function Pushbutton Actions

ProcessMeter

A OUTPUT

[ mA

B OUTPUT

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 (E)

Test leads in

SIMULATE:

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

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

BLUE cycles through:

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

• Repeating 0% -100% - 0% ramp in 25% steps (N on display)

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

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MIN MAX RANGE HOLD

% STEP COARSE FINE

REL Hz

Figure 5. Pushbuttons

Table 5. Pushbuttons

No. Pushbutton Function(s)

b Toggles the backlight

(BLUE)

Rotary switch in mA A Lposition and test lead plugged into c A jack: Toggles between ac and dc ampere measure

Rotary switch in O position: Selects diode test function (D) Rotary switch in OUTPUT mA Jposition: Cycles through

• Slow repeating 0% -100% - 0% ramp (Eon display)

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

• Repeating 0% -100% - 0% ramp in 25% steps (N on display)

ee003f.eps

Table 5. Pushbuttons (cont.)

No. Pushbutton Function(s)

ProcessMeter

Getting Acquainted with the Meter

% STEP

COARSE

FINE FINE

COARSE

% STEP

Measuring: mA Output:

Selects a MIN, MAX, or AVG action (see pg. 18)

Adjusts mA output up to the next higher 25% step

Selects a fixed range (hold for 1 second for auto range)

Adjusts output up 0.1 mA

Toggles TouchHold, or in MIN MAX recording, suspends recording

Adjusts output up 0.001 mA

Toggles between frequency counter and ac voltage measurement functions

Adjusts output down 0.001 mA

Toggles relative reading (sets a relative zero point)

Adjusts output down 0.1 mA

Toggles between Ω measure and continuity functions

Adjusts mA output down to the next lower 25% step

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6 7

Figure 6. Elements of the Display

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Table 6. Display

No. Element Meaning

ProcessMeter

Getting Acquainted with the Meter

A Percentage display

B OUTPUT

C D

D S

E Q

F B G Numerals

H H I MINMAXAVGR

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 diode test function Lights in continuity function Lights when relative reading is on Lights when the battery is low Show the input or output value Lights when TouchHold is on MIN MAX recording status indicators:

MIN means the display is showing the minimum recorded value. MAX means the display is showing the maximum recorded value. AVG means the display is showing the average value since starting recording (up to

about 35 hours continuous recording time). Rmeans MIN MAX recording is on.

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Table 6. Display (cont.)

No. Element

J mA, DC, mV, AC,

M or kΩ, kHz

K Auto

400100030

L EP N

Meaning

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

Range status indicators:

Auto means autoranging is on. The number plus the unit and multiplier indicate the active range.

One of these lights in mA ramping or step output (rotary switch position mA J):

E means slow continuous 0% - 100% - 0% ramping. P means fast continuous 0% - 100% - 0% ramping. N means ramping in 25% steps.

ProcessMeter

Measuring Electrical Parameters

The proper sequence for taking measurements is as follows:

1. Plug the test leads into the appropriate jacks.

2. Set the rotary knob.

3. Touch the probes to the test points.

Input Impedance

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

Ranges

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

Being in the right range is important:

• 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 accurate measurement .

The meter normally automatically selects the lowest range that will measure the applied input signal (Auto showing on the display). Press Kif you want to lock the range. Each time you press K, the meter selects the next higher range.

If you have locked the range, the meter resumes auto ranging when you change to another measurement function or you press K and hold it for 1 second.

Measuring a Composite Signal

Because the input is dc-coupled, to meaure an ac voltage or frequency with a dc bias, you must manually select the range specified in Table 7. For example, to measure 100 mV ac with 20 V dc superimposed, select the 4 V range.

Table 7. Range Requirements for Measuring a

Composite Signal

Range (ac) Max. Allowable AC + DC

400.0 mV 3 V

4.000 V 30 V

40.00 V 300 V

400.0 V 400 V 1000 V 1000 V

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Testing Diodes

To test a single diode:

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

2. Set the rotary switch to O.

3. Press the BLUE pushbutton 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 should display OL, indicating a high impedance.

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 you turn the meter off, switch to another measurement or source function, or turn MIN MAX 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 I to suspend recording; press I again to resume recording.

ProcessMeter

Measuring Electrical Parameters

Using TouchHold

Note

You must have MIN MAX recording off to use TouchHold.

! Warning

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



Activate TouchHold display on each new stable reading (except in the frequency counter function). Press I to activate TouchHold. This feature allows you to take measurements in situations in which it is difficult to look at the display. The meter beeps and updates the display with each new stable reading.

if you want the meter to freeze the

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 is to compensate for test lead resistance when measuring Ω.

Select the Ω measure function, touch the test leads together, then press C. Until you press C again, or switch to another measurement or source function, the readings on the display will subtract the lead resistance.

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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. You can choose source mode, in which the meter supplies the current, or simulate mode, in which the meter regulates current in an externally-powered current loop.

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 you need 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 i s in use.

787

PROCESSMETER

ProcessMeter

Using the Current Output Functions

MIN MAX RANGE HOLD

% STEP COARSE FINE

OFF

OUTPUT 0-24mA

SOURCE SIMULATE

+ +

0.44A

(1A/30 sec)

FUSED

30mA

FUSED

REL Hz

COM

CAT

1000V

OUTPUT

100

ee010f.eps

Figure 7. Sourcing Current

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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 24 to 30V is in series with the current loop under test.

Caution

Set the rotary switch to one of the mA output settings BEFORE you connect the test leads to a current loop. Otherwise, a low impedance from the other rotary switch positions could be presented to the loop, causing up to 50 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 i s in use.

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 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 the Kpushbutton while you turn the rotary switch to OUTPUT [ mA.

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

dc V

Power Supply

COM +24V

787

PROCESSMETER

ProcessMeter

Using the Current Output Functions

REL Hz

COM

CAT

1000V

OUTPUT

MIN MAX RANGE HOLD

% STEP COARSE FINE

OFF

OUTPUT 0-24mA

SOURCE SIMULATE

+ +

0.44A

(1A/30 sec)

FUSED

30mA

Figure 8. Simulating a Transmitter

100

ee011f.eps

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Producing a Steady mA Output

When the rotary 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.

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

Table 8. mA Output Adjust Pushbuttons

Pushbutton Adjustment

COARSE

FINE FINE

COARSE

Adjusts up 0.1 mA

Adjusts up 0.001 mA

Adjusts down 0.001 mA

Adjusts down 0.1 mA

ProcessMeter

Using the Current Output Functions

Manually Stepping the mA Output

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

Note

The COARSE and FINE adjustment pushbuttons described on the previous page are available when you are manually stepping the mA output.

Table 9. mA Stepping Pushbuttons

Pushbutton Adjustment

% STEP % STEP

Adjusts up to the next higher 25% step

Adjusts down to the next lower 25% step

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Table 10. mA Step Values

Step Value (for each span setting)

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

When the rotary switch is in the OUTPUT mA Jposition, the meter produces a continuously repeating 0% - 100% - 0% ramp in your choice of three ramp waveforms:

E 0% - 100% - 0% 40-second smooth ramp,

(default)

P 0% - 100% - 0% 15-second smooth ramp N 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 the BLUE pushbutton to cycle through the three waveforms.

Note

At any time during auto ramping, you can freeze the ramp simply by moving the rotary switch to

[ mA

the

COARSE, FINE

pushbuttons to make adjustments.

position. Then you can use the

, and

% STEP

adjust

ProcessMeter

Power-Up Options

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

Table 11. Power-Up Options

Option Pushbutton Default Action Taken

Change current span 0% setting K Remembers

Disable beeper T Enabled Disables beeper Disable auto power-off BLUE Enabled Disables the feature that turns off the meter

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

You may activate more than one power-up option by holding down more than one pushbutton.

Toggles between 0 and 4 mA

last setting

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

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Battery Life

WWarning

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 you are not using it.

Table 12. Typical Alkaline Battery Life

Meter Operation Hours

Measuring any parameter or simulating current

Sourcing 12 mA into 500Ω 12

Using the Holster and Flex-Stand

The meter is supplied with a snap-on holster that absorbs shocks and protects the meter from rough handling. You can turn the meter over in the holster to protect the face of the meter from scratches when carrying the meter.

The holster is equipped with a Flex-Stand bail. Some uses of the holster with Flex-Stand are shown in Figure 9.

Maintenance

This section provides some basic maintenance procedures. Repair, calibration, 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 your meter once a year to ensure that it performs according to its specifications. Contact a Fluke Service Center for instructions.

ProcessMeter

Maintenance

Holster with Flex-Stand bent

Meter in holster face down

for protection

(Store Quick Reference Card under meter)

Figure 9. Using the Holster and Flex-Stand

Holster with

Flex-Stand extended

Holster with Flex-Stand

looped over wall

Holster with probe in clip

Holster with Flex-Stand

looped over belt

ee009f.eps

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Replacing the Battery

! Warning

To avoid electrical shock, remove test leads from the meter before you open the battery door.

Close and latch the battery door before you use the meter.

Remove test leads from the meter before you open the battery door.

Replace the battery as follows. Refer to Figure 10. Use an alkaline 9V battery, type ANSI/NEDA 1604A or IEC 6LR61.

1. Remove the test leads and set the rotary switch to 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. Lift off the battery door.

Figure 10. Replacing the Battery

ee007f.eps

ProcessMeter

Maintenance

Replacing a Fuse

! Warning

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

943121.

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

1. Turn the rotary switch to mA A L.

2. Plug the black test lead into COM, and the red test lead into cA.

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

4. Move red test lead to dmA.

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

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 rotary switch to OFF.

2. Remove the battery door.

3. Remove the three Phillips-head screws from the case bottom and turn the case over.

4. Gently lift the bottom of the front of the case (nearest the inpu t/output jacks) until the top unsnaps from the rear half of the case.

5. Replace the blown fuse with the exact type specified: 440 mA 1000V fast-blow fuse, Fluke PN 943121. Both fuses are the same type.

6. Make sure the rotary switch is in the OFF position.

7. Fit the top of case together, engaging the two snaps (item A). Make sure that the gasket is properly seated.

8. Close the case and reinstall the three screws.

9. Replace the battery door.

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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 switch position.

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.

Figure 11. Replacing a Fuse

ee012f.eps

ProcessMeter

Replacement Parts and Accessories

! Warning

To avoid personal injury or damage to the meter, use only the specified replacement fuse, 440 mA 1000V 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 your nearest Fluke distributor.

To find out how to order parts or accessories use the telephone numbers or addresses shown on page 1 of this manual.

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Table 13. Replacement Parts

Item Description Fluke PN or Model no. Quantity

BT1 9V battery, ANSI/NEDA 1604A or IEC 6LR61 614487 1 CG81Y Holster, Yellow CG81G 1 ! F1, 2 Fuse, 440 mA, 1000V fast-blow 943121 2 MP85 Case top 619962 1 MP86 Case bottom 619939 1 H2, 3, 4 Case screw 832246 3 MP89, 90 Non-skid foot 824466 2 MP8 O-ring for input/output receptacle 831933 1 MP92 Battery door 619947 1 H5, 6 Battery door fasteners 948609 2 S1 Keypad 646932 1 TL75 Standard test lead set TL75 1 AC70A Alligator clips for use with TL75 test lead set AC70A 1 TL20 Industrial test lead set TL20 Option TM1 Product Overview Manual 1586717 1 TM2 Users Manual (CD-ROM) 1586721 1 TM3 Calibration Manual (not shown) 641891 Option

ProcessMeter

Replacement Parts and Accessories

MP85

MP8

MP86

H2, 3, 4

BT1

H5, 6

MP92

TL20 (Option) Industrial

Test Lead Set

AC70A

Alligator Clips

MP89, 90

Figure 12. Replacement Parts

Product Overview Manual

CD-ROM (Users Manual)

TL75

Test Lead Set

Holster

CG81Y

ee015c.eps

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Users Manual

Specifications

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

All specifications assume a 5 minute warmup period.

The standard specification interval is 1 year.

Note

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

DC Volts Measurement

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

4.000 0.001V 0.1% + 1

40.00 0.01V 0.1% + 1

400.0 0.1V 0.1% + 1 1000 1V 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: 1000V

DC Millivolts Measurement

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

400.0 0. 1 mV 0.1% + 1

AC Volts Measurement

Range (ac) Resolution 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

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

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

400.0V 0.1V 0.7% + 2 1.2% + 4 7.0% + 4 1000V 1V 0.7% + 2 1.2% + 4 7.0% + 4

Specifications are valid from 5% to 100% of amplitude range. AC conversion: true rms Maximum crest factor: 3 For non-sinusoidal waveforms, add Input impedance: 10 M Common mode rejection ratio: >60 dB at dc, 50 Hz, or 60 Hz

Ω

(nominal), < 100 pF, ac-coupled

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

ProcessMeter

Specifications

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Users Manual

AC Current Measurement

Range

45 Hz to 2 kHz

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

Note: 440 mA continuous, 1A 30 seconds maximum Specifications are valid from 5% to 100% of amplitude range.

AC conversion: true rms Maximum crest factor: 3 For non-sinusoidal waveforms, add Overload protection 440 mA, 1000V fast-blow fuse

Resolution Accuracy, ±(% of Reading + Counts) Typical Burden

Voltage

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

DC Current Measurement

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

Voltage

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

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

Note: 440 mA continuous, 1A 30 seconds maximum Overload protection: 440 mA, 1000V fast-blow fuse

Ohms Measurement

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

400.0Ω 0. 1Ω 220 µA 0.2% + 2

4.000 kΩ 0.001 kΩ 59 µA 0.2% + 1

40.00 kΩ 0.01 kΩ 5.9 µA 0.2% + 1

400.0 kΩ 0.1 kΩ 590 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: 1000V Open circuit voltage: <3.9V

ProcessMeter

Specifications

787

Users Manual

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

Input Range Minimum Sensitivity (rms Sinewave)

5 Hz to 5 kHz*

1 V 0.1 V 4 V 1 V

40 V 3 V

400 V 30 V

1000 V 300 V

* Usable 0.5 Hz to 20 kHz with reduced sensitivity.

ProcessMeter

Specifications

Diode Test and Continuity Test

Diode test indication: display voltage drop: 0.2 mA

nominal test current at 0.6V: 2.4V full scale, accuracy ±(2% + 1 count)

Continuity test indication: continuous audible tone for test resistance <100Ω

Open circuit voltage: <3.9V Short circuit current: 1.2 mA typical Overload protection: 1000V rms

DC Current Output

Source mode:

Span: 0 mA or 4 mA to 20 mA, with overrange to 24 mA Accuracy: 0.05% of span Compliance voltage: 12V with battery voltage >8.5V

Simulate Mode:

Span: 0 mA or 4 mA to 20 mA, with overrange to 24 mA Accuracy: 0.05% of span Loop voltage: 24V nominal, 30V maximum, 15V minimum

Compliance voltage: 21V for 24V supply Burden voltage: <3V

General Specifications

Maximum voltage applied between any jack and earth ground: 1000V

Storage temperature: -40°C to 60°C Operating temperature: -20°C to 55°C Operating altitude: 2000 meters maximum Temperature coefficient: 0.05 x specified accuracy per

°C for temperatures <18°C or >28°C

Accuracy adders for use in RF Fields: In an RF field of 3V/m, change the accuracy specifications as follows:

For DC Millivolts Measrement, add 0.03% of range For AC Volts Measurement, add 0.37% of range For DC Current Measurement, 30.000 mA range, add

0.14% or range

For DC Current Output, add 0.02% of span Accuracy for all meter functions is not specified in RF

fields > 3V/m.

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

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Users Manual

Vibration: Random 2g, 5 to 500 Hz Shock: 1 meter drop test Water and dust protection: Complies with IEC529 IP52

(normal operating vacuum used for dust test) Safety: Complies with IEC1010-1, ANSI/ISA S82.01-

1994 and CAN/CSA C22.2 No. 1010.1-92 Overvoltage Category III.

Certifications: CSA, UL, TÜV Power requirements: Single 9V battery (ANSI/NEDA

1604A or IEC 6LR61) Size: 32 mm H x 87 mm W x 187 mm L (1.25 in H x 3.41

in W x 7.35 in L); With holster and Flex-Stand: 52 mm H x 98 mm W x 201

mm L (2.06 in H x 3.86 in W x 7.93 in L) Weight: 369 g (13 oz); With holster and Flex-Stand: 638 g (22.5 oz)

—A—

Auto

Ramping, 17, 26 Ranging, 17 Stepping, 17

—B—

Battery

Replacement, 30

Buttons, 12

Index

Current output

Compliance, 24 Load impedance, 24 Ramping, auto, 26 Simulating a transmitter, 22 Sourcing, 20 Span (4-20 mA or 0-20 mA), 22 Steady, 24 Stepping, auto, 26 Stepping, manually, 25 With external loop supply, 22

—D—

—C—

Calibrating the meter, 28 Compensating for test lead resistance, 19 Composite Signals, 17

Diodes, testing, 18 Display, 15

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Users Manual

—F—

Flex-Stand, 28 Freezing a reading (TouchHold), 19 Fuse, checking and replacing, 31

—H—

Holster, 28

—I—

Input/Output jacks, 7

—J—

Jacks, 7

—K—

Knob positions, 9, 11

—L—

Loop supply, external, 22

M—

mA output. Mailing address for Fluke, 2 Maintenance, 28 Malfunction, 32 Measuring, 17 MIN MAX recording, 18

See

Current output

—O—

Offset, programming an, 19 Options, power-up, 27 Output.

See

Current output

—P—

Parts, replacement, 34 Power-up options, 27 Pushbuttons, 12

Index

(continued)

—R—

Range

Auto, 17

Locking, 17 Ranges, 17 Relative reading, 19 Rotary switch positions, 9, 11

—S—

Safety information, 2 Screen, 15 Service and sales, 1 Settings, 27

Simulating.

See

Current output

Sourcing. Specifications, 36 Switch positions, 9, 11 Symbols, international, 4

See

Current output

—T—

Telephone numbers, 1 TouchHold, 19

—W—

Warranty.

Service, 32

WWW address for Fluke, 2

See

back of Title Page

787

Users Manual

Fluke 787 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

LIMITED WARRANTY & LIMITATION OF LIABILITY

Table of Contents

Introduction

Contacting Fluke

Safety Information

How to Get Started

Getting Acquainted with the Meter

Measuring Electrical Parameters

Input Impedance

Ranges

Measuring a Composite Signal

Testing Diodes

Displaying Minimum, Maximum, and Average

Using TouchHold

Compensating for Test Lead Resistance

Using the Current Output Functions

Source Mode

Simulate Mode

Changing the Current Span

Producing a Steady mA Output

Manually Stepping the mA Output

Auto Ramping the mA Output

Power-Up Options

Battery Life

Using the Holster and Flex-Stand

Maintenance

General Maintenance

Calibration

Replacing the Battery

Replacing a Fuse

If the Meter does not Work

Replacement Parts and Accessories

Specifications

Index