Fluke 87 III, 85 III, 83 III, 80 III Service Manual

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80 Series III

Multimeters

Service Information

PN 688645 April 1998 Rev.2, 6/02

Lifetime Limited Warranty

Each Fluke 20, 70, 80, 170 and 180 Series DMM will be free from defects in material and

workmanship for its lifetime. As used herein, “lifetime” is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from the date of purchase. This warranty does not cover fuses, disposable batteries, damage from neglect, misuse, contamination, alteration, accident or abnormal conditions of operation or handling, including failures caused by use outside of the product’s specifications, or normal wear and tear of mechanical components. This warranty covers the original purchaser only and is not transferable.

For ten years from the date of purchase, this warranty also covers the LCD. Thereafter, for the lifetime of the DMM, Fluke will replace the LCD for a fee based on then current component acquisition costs.

To establish original ownership and prove date of purchase, please complete and return the registration card accompanying the product, or register your product on http://www.fluke.com. Fluke will, at its option, repair at no charge, replace or refund the purchase price of a defective product purchased through a Fluke authorized sales outlet and at the applicable international price. Fluke reserves the right to charge for importation costs of repair/replacement parts if the product purchased in one country is sent for repair elsewhere.

If the product is defective, 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 difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Fluke will pay return transportation for product repaired or replaced in-warranty. Before making any non-warranty repair, Fluke will estimate cost and obtain authorization, then invoice you for repair and return transportation.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY. AUTHORIZED RESELLERS ARE NOT AUTHORIZED TO EXTEND ANY DIFFERENT WARRANTY ON FLUKE’S BEHALF. Since some states 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. If any provision of this warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

2/02

Title Page

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

Precautions and Safety Information.................................................................. 2

International Symbols........................................................................................ 2

Safety Information............................................................................................. 3

Specifications .................................................................................................... 4

Accuracy ....................................................................................................... 4

General.......................................................................................................... 4

AC Voltage Specifications (Models 85 and 87)........................................... 5

AC Voltage Specifications (Model 83)......................................................... 5

DC Voltage, Resistance, and Conductance Specifications........................... 5

Current Specifications................................................................................... 6

Capacitance and Diode Function Specifications .......................................... 6

Frequency Counter Specifications................................................................ 6

Frequency Counter Sensitivity and Trigger Levels ...................................... 7

MIN MAX Recording Specifications........................................................... 7

Electrical Characteristics of the Terminals................................................... 8

Required Equipment.......................................................................................... 8

Basic Maintenance ............................................................................................ 9

Opening the Meter Case................................................................................ 9

Removing and Reinserting the Circuit Board Assembly.............................. 10

Reassembling the Meter Case....................................................................... 11

Replacing the Battery.................................................................................... 11

Testing Fuses (F1 and F2)............................................................................. 12

Replacing Fuses ............................................................................................ 13

Cleaning........................................................................................................ 13

Input Terminals......................................................................................... 13

Rotary Switch ........................................................................................... 14

Performance Tests............................................................................................. 14

A Basic Operability Test............................................................................... 14

Testing the Display ....................................................................................... 15

Testing the Rotary Switch............................................................................. 15

Testing the AC Voltage Function................................................................. 16

Testing the Frequency Function.................................................................... 17

Testing the Frequency Sensitivity and Trigger Level................................... 17

Testing DC Voltage ...................................................................................... 18

Testing the PEAK MIN MAX Function (Model 87 only)............................ 18

80 Series III

Service Manual

Testing the mV DC Function........................................................................ 19

Testing the Resistance Function ................................................................... 19

Testing the Capacitance Function................................................................. 20

Checking the Diode Test Function................................................................ 20

Testing the Milliamp (mA) Function............................................................ 21

Testing the Microamp (µA) Function........................................................... 21

Testing the Amp (A) Function...................................................................... 22

Calibration......................................................................................................... 23

Calibrating the Model 85 and 87 III.............................................................. 23

Calibrating the Model 83 III......................................................................... 25

Parts and Accessories........................................................................................ 25

List of Tables

Table Title Page

1. International Symbols............................................................................................ 2

2. Required Tools and Equipment............................................................................. 9

3. Rotary Switch Test ................................................................................................ 16

4. AC Voltage Test .................................................................................................... 16

5. Frequency Test....................................................................................................... 17

6. Frequency Counter Sensitivity and Trigger Level Tests....................................... 18

7. DC Voltage Test .................................................................................................... 18

8. Peak MIN MAX Test............................................................................................. 19

9. Ohms Tests ............................................................................................................ 20

10. Capacitance Tests .................................................................................................. 20

11. mA Tests................................................................................................................ 21

12. µA Tests................................................................................................................. 22

13. Current Tests.......................................................................................................... 22

14. Replacement Parts ................................................................................................. 25

15. Accessories............................................................................................................ 26

iii

80 Series III

Service Manual

List of Figures

Figure Title Page

1. Disassembly Details............................................................................................... 10

2. Battery and Fuse Replacement .............................................................................. 11

3. Testing the Current Input Fuses............................................................................. 12

4. Display Test........................................................................................................... 15

5. Calibration Adjustment Points............................................................................... 24

6. Replaceable Parts................................................................................................... 26

80 Series III

Service Manual

Introduction

To avoid shock or injury, do not perform the verificati on t est s or calibration procedures described in this manual unless you are qualified to do so.

The information provided in this document is for the use of qualified personnel only.

The 80 III Multimeter contains parts that can be damaged by static discharge.

Follow the standard practices for handling static sensitive devices.

The 80 Series III Service Information provides the following information:

• Precautions and safety information

• Specifications

• Basic maintenance (cleaning, replacing the battery and fuses)

• Performance test procedures

• Calibration and calibration adjustment procedures

• Accessories and replaceable parts

W Warning

Caution

For complete operating instructions, refer to the 80 Series III Users Manual. To contact Fluke, 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

For additional information about Fluke, its products, and services, visit Fluke’s web site at:

www.fluke.com

80 Series III

Service Information

Precautions and Safety Information

International Symbols

Symbol Meaning Symbol Meaning

Use the Meter only as described in the Users Manual. If you do not do so, the protection provided by the Meter may be impaired.

Read the “Safety Information” page before servicing this product. In this manual, 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 test instruments.

International symbols used on the Meter and in this manual are explained in Table 1.

Table 1. International Symbols

Alternating current Earth ground

Direct current Fuse

Alternating or direct current Conforms to European Union

directives

Refer to the manual. Important information.

Take appropriate precautions. Hazardous voltage may be present

Battery

Conforms to relevant Canadian Standards Association directives

Double insulated

IEC overvoltage category III

Safety Information

WWarnings and Precautions

To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, follow these guidelines:

Before using the Meter inspect the case. Do not use the Meter if it is damaged.

•

Look for cracks or missing plastic. Pay particular attention to the insulation around the connectors.

Inspect the test leads for damaged insulation or exposed metal. Check the test

•

leads for continuity. Replace damaged test leads before using the Meter.

Verify the Meter’s operation by measuring a known voltage. Do not use the Meter

•

if it operates abnormally. Protection may be impaired. When in doubt, have the Meter serviced.

Do not apply more than the rated voltage, as marked on the Meter, between the

•

terminals or between any terminal and earth ground. Use caution when working with voltages above 30 V ac rms, 42 V ac peak, or 60 V

•

dc. These voltages pose a shock hazard.

Multimeters

Use the proper terminals, function, and range for your measurements.

•

Do not operate the Meter around explosive gas, vapor, or dust.

•

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

•

When making connections, connect the common test lead before connecting the

•

live test lead; when disconnecting, disconnect the live test lead before disconnecting the common test lead.

Disconnect circuit power and discharge all high-voltage capacitors before testing

•

resistance, continuity, diodes, or capacitance. Before measuring current, check the Meter's fuses (see “Testing Fuses”) and

•

turn OFF power to the circuit before connecting the Meter to the circuit. Do not operate the Meter with the case (or part of the case) removed.

•

Use only a single 9 V battery, properly installed in the battery receptacle, to

•

power the Meter. Replace the battery as soon as the battery indicator (M) appears. With a low

•

battery, the Meter might produce false readings that can lead to electric shock and personal injury,

• Remove test leads from the Meter before opening the Meter case.

• When servicing the Meter, use only specified replacement parts.

80 Series III

Service Information

Specifications

Accuracy

General

Accuracy is given for a period of one year after calibration, at 18 °C to 28 °C, with relative humidity up to 90 % as:

±([% of reading] + [number of least significant digits])

For Model 87 in the 4 ½-digit mode, multiply the number of least significant digits (counts) by 10. AC conversions are ac-coupled and valid from 5 % to 100 % of range.

Models 85 and 87 are true rms responding. AC crest factor can be up to 3 at full scale, 6 at half scale. For non-sinusoidal wave forms add −(2 % reading + 2 % full scale) typical, for a crest factor up to 3.

Maximum Voltage between any Terminal and Earth Ground

WFuse Protection for mA or µA inputs WFuse Protection for A input

Display Digital: 4000 counts updates 4/sec; (Model 87 also has

Temperature Operating: -20 °C to +55 °C;

Altitude Operating: 2000 m; Storage: 10,000 m Temperature Coefficient 0.05 x (specified accuracy)/ °C (<18 °C or >28 °C) Electromagnetic Compatibility In an RF field of 1 V/m on all ranges and functions except

Relative Humidity 0 % to 90 % (0 °C to 35 °C);

1000 V rms

44/100 A, 1000 V FAST Fuse 11 A, 1000 V FAST Fuse

19,999 counts in 4½-digit mode, updates 1/sec.). Analog: updates 40/sec. Frequency: 19,999 counts, updates 3/sec at >10 Hz. Model 87: 4 x 32 segments (equivalent to 128); Models 83, 85: 43 segments.

Storage: -40 °C to +60 °C

capacitance: Models 85 and 87 Total Accuracy = Specified Accuracy + 2.5 % of range. Model 83 Total Accuracy = Specified Accuracy + 0.3 % of range. Capacitance not specified in RF fields. Above 1 V/m is not specified.

0 % to 70 % (35 °C to 55 °C)

Battery Type 9 V zinc, NEDA 1604 or 6F22 or 006P Battery Life 400 hrs typical with alk al i ne (wi th backlight off) Shock Vibration Size (H x W x L) 1.25 in x 3.41 in x 7.35 in (3.1 cm x 8.6 cm x 18.6 c m ) Size with Holster and Flex-Stand 2.06 in x 3.86 in x 7.93 in (5.2 cm x 9.8 cm x 20.1 c m ) Weight 12.5 oz (355 g) Weight with Holster and Flex-Stand 22.0 oz (624 g) Safety Complies with ANSI/ISA S82.01-1994, CSA 22. 2 No. 1010.1:1992

Per MIL-T-28800 for a Class 2 instrument

to 1000 V Overvoltage Category III. UL listed to UL3111-1. Licensed by TÜV to EN61010-1.

AC Voltage Specifications (Models 85 and 87)

Function Range Resolution Accuracy

50-60 Hz 45 Hz - 1 kHz 1-5 kHz 5-20 kHz

400.0 mV

4.000 V

40.00 V

400.0 V 1000 V

1. For extended use at high RH, change the 400 m V and 4.0 V ac accuracy specification to ± (1.5 % + 4 counts) for 45 Hz to 1 kHz and ± (3.0 % + 25 c ounts) for 5 kHz to 20 kHz.

2. Below 10 % of range, add 6 counts.

3. Models 85 and 87 are true rms responding Met ers. When the input leads are shorted together in the ac functions, the Meters display a reading (t ypically <25 counts) caused by internal amplifi er noi se. The accuracy on Models 85 and 87 is not significant l y affected by this i nternal offset when measuring i nput s that are within 5 % to 100 % of the selected range. When the rms v al ue of the two values (5 % of range and internal offset) is cal culated, the effect i s minimal as shown in the fol l owi ng example where 20.0 = 5 % of 400 mV range, and 2. 5 i s the internal offset: RMS = SQRT[(20.0) constant error that is equal to t he int ernal of fset will result.

4. Frequency range: 1 kHz to 2.5 k Hz .

5. Below 10 % of range, add 16 counts.

+ (2.5)2] = 20.16. If you use the REL function to zero the display when using the ac func t i ons, a

0.1 mV

0.001 V

0.01 V

0.1 V 1 V

±(0.7 % + 4) ±(0.7 % + 2) ±(0.7 % + 2) ±(0.7 % + 2) ±(0.7 % + 2)

±(1.0 % + 4) ±(1.0 % + 4) ±(1.0 % + 4) ±(1.0 % + 4) ±(1.0 % + 4)

±(2.0 % + 4) ±(2.0 % + 4) ±(2.0 % + 4) ±(2.0 % + 4)

unspecified

±(2.0 % + 20) ±(2.0 % + 20) ±(2.0 % + 20)

unspecified unspecified

AC Voltage Specifications (Model 83)

Function Range Resolution Accuracy

50 Hz - 60 Hz 45 Hz - 1 kHz 1 kHz - 5 kHz

400.0 mV

4.000 V

40.00 V

400.0 V 1000 V

1. For extended use at high RH, change the 400 m V and 4.0 V ac accuracy specification to ± (1.5 % + 4 counts) for 45 Hz to 1 kHz and ± (3.0 % + 25 count s) for 5 kHz to 20 kHz.

2. Below a reading of 200 counts, add 10 c ount s.

3. Frequency range: 1 kHz to 2.5 k Hz .

0.1 mV

0.001 V

0.01 V

0.1 V 1 V

±(0.5 % + 4) ±(0.5 % + 2) ±(0.5 % + 2) ±(0.5 % + 2) ±(0.5 % + 2)

±(1.0 % + 4) ±(1.0 % + 4) ±(1.0 % + 4) ±(1.0 % + 4) ±(1.0 % + 4)

±(2.0 % + 4) ±(2.0 % + 4) ±(2.0 % + 4) ±(2.0 % + 4)

unspecified

Multimeters

Specifications

DC Voltage, Resistance, and Conductance Specifications

Accuracy

Function Range Resolution Model 83 Model 85 Model 87

4.000 V

40.00 V

400.0 V 1000 V

400.0 mV 0.1 mV ±(0.3 % + 1) ±(0.1 % + 1) ±(0.1 % + 1)

400.0 Ω

4.000 kΩ

40.00 kΩ

400.0 kΩ

4.000 MΩ

40.00 MΩ

1. For extended use at high RH, change the 400 m V and 4.0 V ac accuracy specification to ± (1.5 % + 4 counts) for

45 Hz to 1 kHz and ± (3.0 % + 25 count s) for 5 kHz to 20 kHz.

2. When using the REL ∆ function to compensate for offset s.

40.00 nS

0.001 V

0.01 V

0.1 V 1 V

0.1 Ω

0.001 kΩ

0.01 kΩ

0.1 kΩ

0.001 MΩ

0.01 MΩ

0.01 nS

±(0.1 % + 1) ±(0.1 % + 1) ±(0.1 % + 1) ±(0.1 % + 1)

±(0.4 % + 2) ±(0.4 % + 1) ±(0.4 % + 1) ±(0.7 % + 1) ±(0.7 % + 1) ±(1.0 % + 3) ±(1.0 % + 10)

±(0.08 % + 1) ±(0.08 % + 1) ±(0.08 % + 1) ±(0.08 % + 1)

±(0.2 % + 2) ±(0.2 % + 1) ±(0.2 % + 1) ±(0.6 % + 1) ±(0.6 % + 1) ±(1.0 % + 3) ±(1.0 % + 10)

±(0.05 % + 1) ±(0.05 % + 1) ±(0.05 % + 1) ±(0.05 % + 1)

±(0.2 % + 2) ±(0.2 % + 1) ±(0.2 % + 1) ±(0.6 % + 1) ±(0.6 % + 1) ±(1.0 % + 3) ±(1.0 % + 10)

80 Series III

Service Information

Current Specifications

Accuracy

Burden Voltage

Function Range Resolution

Model 83

Model 85

3,4

Model 87

3,4

(typical)

mA \

(45 Hz to 2 kHz)

mA [ 40.00 mA

A B

(45 Hz to 2 kHz)

1. For extended use at high RH, change the 400 m V and 4.0 V ac accuracy specification to ± (1.5 % + 4 counts) for 45 Hz to 1 kHz and ± (3.0 % + 25 count s) for 5 kHz to 20 kHz.

2. AC conversion for Model 83 is ac coupled and calibrated to the rm s value of a sinewave input.

3. AC conversions for Models 85 and 87 are ac coupled, true rms res pondi ng, and valid from 5 % to 100 % of range.

4. See note 2 in under “

5. 10 A continuous; 20 A for 30 s econds maximum: Ac curacy unspecified ov er 10 A .

6. Below a reading of 200 counts, add 10 c ount s.

40.00 mA

400.0 mA 4000 mA

10.00 A

400.0 mA 4000 mA

10.00 A

400.0 µA 4000 µA

0.01 mA

0.1 mA 1 mA

0.01 A

0.01 mA

0.1 mA 1 mA

0.01 A

0.1 µA 1 µA

AC Voltage Specifications (Models 85 and 87).”

±(1.2 % + 2) ±(1.2 % + 2) ±(1.2 % + 2) ±(1.2 % + 2)

±(0.4 % + 4) ±(0.4 % + 2) ±(0.4 % + 4) ±(0.4 % + 2)

±(1.2 % + 2) ±(1.2 % + 2)

±(0.4 % + 4) ±(0.4 % + 2)

6 6 6 6

6 6

±(1.0 % + 2) ±(1.0 % + 2) ±(1.0 % + 2) ±(1.0 % + 2)

±(0.2 % + 4) ±(0.2 % + 2) ±(0.2 % + 4) ±(0.2 % + 2)

±(1.0 % + 2) ±(1.0 % + 2)

±(0.2 % + 4) ±(0.2 % + 2)

6 6 6 6

6 6

±(1.0 % + 2) ±(1.0 % + 2) ±(1.0 % + 2) ±(1.0 % + 2)

±(0.2 % + 4) ±(0.2 % + 2) ±(0.2 % + 4) ±(0.2 % + 2)

±(1.0 % + 2) ±(1.0 % + 2)

±(0.2 % + 4) ±(0.2 % + 2)

1.8 mV/mA

0.03 V/A

1.8 mV/mA

0.03 V/A

100 µV/µA 100 µV/µA

Capacitance and Diode Function Specifications

Function Range Resolution Accuracy

E 5.00 nF

0.0500 µF

0.500 µF

5.00 µF

0.01 nF

0.0001 µF

0.001 µF

0.01 µF

±(1 % + 3) ±(1 % + 3) ±(1 % + 3) ±(1.9 % + 3)

G 3.000 V 0.001 V ±(2 % + 1)

1. With a film capaci t or or better, using Relative m ode to zero residual. See “Accuracy” earlier in the specifications for a complete explanation.

Frequency Counter Specifications

Function Range Resolution Accuracy

Frequency (0.5 Hz to 200 kHz, pulse width >2 µs)

199.99

1999.9

19.999 kHz

199.99 kHz >200 kHz

1. See “Accuracy” earlier i n the specifications for a complete explanation.

0.01 Hz

0.1 Hz

0.001 kHz

0.01 kHz

0.1 kHz

±(0.005 % + 1) ±(0.005 % + 1) ±(0.005 % + 1) ±(0.005 % + 1)

unspecified

Frequency Counter Sensitivity and Trigger Levels

Multimeters

Specifications

Minimum Sensitivity (RMS Sinewave)

Input Range

400 mV dc 400 mV dc 4 V 40 V 400 V 1000 V

Duty Cycle Range Accuracy

0.0 to 99.9 % Within ±(0.05 % per kHz + 0.1 %) of full scale for a 5 V logic family input on

1. Maximum input for spec i fied accuracy = 10X Range or 1000 V.

5 Hz - 20 kHz 0.5 Hz - 200 kHz

70 mV (to 400 Hz) 150 mV

0.3 V 3 V 30 V 300 V

the 4 V dc range. Within ±((0.06 x Voltage Range/Input Voltage) x 100 %) of full scale for sine

wave inputs on ac voltage ranges.

70 mV (to 400 Hz) 150 mV

0.7 V 7 V (≤140 kHz) 70 V (≤14.0 kHz) 700 V (≤1.4 kHz)

Approximate Trigger Level

(DC Voltage Function)

40 mV



1.7 V 4 V 40 V 400 V

MIN MAX Recording Specifications

Model Nominal

Response

83 100 ms to 80 %

1 s

Specified accuracy ±12 counts for changes >200 ms in duration (±40 counts in ac with beeper on).

Same as specified accuracy for changes >2 seconds in duration (±40 counts in ac with beeper on).

Accuracy

85, 87 100 ms to 80 %

(DC functions) 120 ms to 80 %

(AC functions) 1 s 250 µs

(Model 87 only)

Specified accuracy ±12 counts for changes >200 ms in duration.

Specified accuracy ±40 counts for changes >350 ms and inputs >25 % of range.

Same as specified accuracy for changes >2 seconds in duration. Specified accuracy ±100 counts for changes >250 µs in duration.

80 Series III

Service Information

Electrical Characteristics of the Termi nal s

L Overload Protection

Input Impedance (nominal): 10 MΩ<100 pF Common Mode Rejection Ratio: >120 dB at dc, 50 Hz or 60 Hz

(1 kΩ unbalance)

Normal Mode Rejection: >60 dB at 50 Hz or 60 Hz

mA Overload Protection

Input Impedance (nominal): 10 MΩ<100 pF Common Mode Rejection Ratio: >120 dB at dc, 50 Hz or 60 Hz

(1 kΩ unbalance)

Normal Mode Rejection: >60 dB at 50 Hz or 60 Hz

K Overload Protection

Input Impedance (nominal): 10 MΩ<100 pF (ac-coupled) Common Mode Rejection Ratio: >60 dB , dc to 60 Hz

(1 kΩ unbalance)

e Overload Protection

: 1000 V rms

: 1000 V rms Open Circuit Test Voltage: <1.3 V dc Full Scale Voltage: To 4.0 MΩ: <450 mV dc

Typical Short Circuit Current: 400 Ω: 200 µA

G Overload Protection

Open Circuit Test Voltage: <3.9 V dc Full Scale Voltage: 3.000 Vdc Typical Short Circuit Current: 0.6 mA typical

1. 106 V Hz maximum.

Required Equipment

Required equipment is listed in Table 2. If the recommended models are not available, equipment with equivalent specifications may be used.

Repairs or servicing should be performed only by qualified personnel.

40 MΩ or nS V1.3 V dc

4 kΩ: 80 µA 40 kΩ: 12 µA 400 kΩ: 1.4 µA 4 MΩ: 0.2 µA 40 MΩ: 0.2 µA

: 1000 V rms

Basic Maintenance

Table 2. Required Equipment

Equipment Required Characteristics Recommended Model

Multimeters

Calibrator AC Voltage Range: 0-1000V ac

Accuracy: ±0.12 % Frequency Range: 60-20000 Hz Accuracy: ±3 %

DC Voltage Range: 0-1000V dc Accuracy: ±0.012 %

Current Range: 350 µA-2A Accuracy: AC (60 Hz to 1 kHz): ±0.25 %

DC: ±0.05 %

Frequency Source: 19.999 kHz - 199.99 kHz Accuracy: ±0.0025 % Amplitude: 150 mV to 6V RMS Accuracy: ±5 %

Range: 1Ω - 100 MΩ Accuracy: 0.065 %

Basic Maintenance

WWarning

To avoid shock, remove the test leads and any input signals before opening the case or replacing the battery or fuses.

Fluke 5500A Multi-Product Calibrator or equivalent

Opening the Meter Case

To avoid unintended circuit shorting, always place the uncovered Meter assembly on a protective surface. When the case of the Meter is open, circuit connect ions are exposed.

To open the Meter case, refer to Figures 1 and 2 and do the following:

1. Disconnect test leads from any live source, turn the rotary switch to OFF, and

remove the test leads from the front terminals.

2. Remove the battery door by using a flat-blade screwdriver to the turn the battery

door screws 1/4-turn counterclockwise.

3. The case bottom is secured to the case top by three screws and two internal snaps (at

the LCD end). Using a Phillips-head screwdriver, remove the three screws.

The gasket between the two case halves is sealed to, and must remain

with, the case bottom. The case top lifts away from the gasket easily. Do not damage the gasket or attempt to separate the case bottom from the gasket.

4. Hold the Meter display side up.

5. Lifting up on the input terminal end, disengage the case top from the gasket.

Caution

Note

6. Gently unsnap the case top at the display end. (See Figure 2).

80 Series III

Service Information

Align Tab

to off

Figure 1. Disassembly Details

ek7f.eps

Removing and Reinserting the Circuit Board Assembl y

Once the case has been opened, the shields can be disconnected from the circuit board assembly as follows:

1. Remove the one Phillips-head screw securing the back shield to the circuit assembly.

Then remove the back shield.

2. The front shield can now be disconnected from the circuit assembly by detaching the

four snaps (one at a time) found on the top-front.

Be gentle when detaching or attaching the four snaps. Excessive force can deform or

fracture the snaps.

3. To reinsert the circuit assembly, push the front shield on so that the four clips engage

gently and simultaneously.

4. Turn the assembly over, and replace the Phillips-head screw and back shield.

Ensure that the shields are tightly attached. Properly fitted shields are required for the Meter to perform to specification.

Multimeters

Basic Maintenance

Figure 2. Battery and Fuse Replacement

Reassembling the Meter Case

To reassemble the Meter Case, do the following:

1. Verify that the rotary switch and circuit board switch are in the

that the gasket remains secured to the case bottom.

2. Place the case top on the case bottom, ensuring that the gasket is properly seated and

the case halves snap together above the LCD end. (See Figure 2.)

3. Reinstall the three screws and the battery door.

4. Secure the battery door by turning the screw 1/4-turn clockwise.

5. Go to “Performance Tests” later in this document, and perform the procedures

described.

Replacing the Battery

The Meter is powered by a single 9 V battery (NEDA 1604, 6F22, or 006P). To replace the battery, refer to Figure 2 and do the following:

1. Turn the rotary switch to OFF and remove the test leads from the terminals.

2. Remove the battery door by using a flat-blade screwdriver to the turn the battery

door screws 1/4-turn counterclockwise.

IY12.eps

OFF position, and

3. Remove the battery and replace it with a new one. Dress the battery leads so that

they will not be pinched between the battery door and case bottom.

4. Replace the battery door and secure the door by turning the screws 1/4-turn

clockwise.

80 Series III

Service Information

Testing Fuses (F1 and F2)

To test the internal fuses of the Meter, refer to Figure 3 and do the following:

1. Turn the rotary selector switch to the ReE position.

2. To test F2, plug a test lead into the Vinput terminal, and touch the probe to

the

A input terminal. (Because the receptacles of the input terminals contain split

contacts, be sure that you touch the probe to the half of the receptacle contact that is nearest the LCD.)

The display should indicate between 00.0 Ω and 00.5 Ω. If the display reads OL (overload), replace the fuse and test again. If the display

reads any other value, further servicing is required.

3. To test F1, move the probe from the

A input terminal to the mA µA input terminal.

The display should read between 0.995 kΩ and 1.005 kΩ.

If the display reads a high resistance or

OL (overload), replace the fuse and test

again. If the display reads any other value, further servicing is required.

TRUE RMS MULTIMETER

PEAK MIN MAX

OFF

mA µA

10A MAX FUSED

PEAK MIN MAX

OFF

mA µA

10A MAX FUSED

MIN MAX RANGE HOLD

COM

400mA MAX

FUSED

1000V MAX

TRUE RMS MULTIMETER

MIN MAX RANGE HOLD

COM

400mA MAX

FUSED

1000V MAX

HzREL

mA A

µA

CAT II

1000V MAX

HzREL

mA A

µA

CAT II

1000V MAX

Good F2 fuse: 00.0Ω to

00.5Ω

Replace fuse: OL

Touch top half

of input contacts

Good F1 fuse: 0.995 KΩ to

1.005KΩ

Replace fuse: OL

Figure 3. Testing the Current Input Fuses

IY5f.eps

Replacing Fuses

To avoid electrical shock, remove the test leads and any input signals before replacing the battery or fuses. To prevent damage or injury, INSTALL ONLY quick acting fuses w i t h the following Amp/Volt current interrupt rat i ngs:

F1 Fuse: 0.440 A, 1000 V, FAST. Minimum i nt errupt rat ing 10,000 A F2 Fuse: 11 A, 1000 V, FAST. Minimum interrupt rating 17,000 A

To replace the Meter’s fuses, refer to Figure 2 and do the following:

Multimeters

Basic Maintenance

WWarning

1. Turn the rotary switch to

2. Remove the battery door by using a flat-blade screwdriver to turn the battery door

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

4. Gently lift the input terminal-end of the case top to separate the two halves of the

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

6. Replace the fuse only with one specified above.

7. Verify that the rotary switch and the circuit board switch are in the

8. Place the case top on the case bottom, ensuring that the gasket is properly seated and

9. Reinsert the three case bottom screws and the battery door.

Cleaning

OFF and remove the test leads from the terminals

screws 1/4-turn counterclockwise.

case.

bracket.

OFF position.

the case halves snap together above the LCD end. (See Figure 2.)

WWarning

To avoid electrical shock or damage to the Meter, never all ow water inside the case. To avoid damaging the Meter’s housing, never apply solvents to the Meter.

If the Meter requires cleaning, wipe it down with a cloth that is lightly dampened with water or a mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or methanol-based fluids when wiping down the Meter.

Input Terminals

Water, dirt, or other contamination in the A or mA µA input terminals may activate the Input Alert beeper even though test leads are not inserted. Such contamination might be dislodged by turning the Meter over and, with all test leads removed, gently tapping on the case.

To clean the input terminals more effectively, do the following:

1. Turn the Meter off and remove all test leads from the terminals.

2. Use a clean swab in each of the four terminals to dislodge and clean out the

contamination.

80 Series III

Service Information

Rotary Switch

3. Moisten a new swab with a cleaning and oiling agent (such as WD40). Work this

swab around in each of the four terminals. The oiling agent insulates the terminals from moisture-related shorting and ensures

against false Input Alerts.

To clean the rotary switch potentiometer, do the following:

1. Remove the circuit board assembly as described earlier under “Removing and

Reinserting the Circuit Board Assembly”.

2. From the back of the circuit board assembly, push the switch shaft in, and remove

the polymer thick film (ptf) contact assembly.

3. Clean the ptf contact assembly and the potentiometer on the circuit assembly with

alcohol. Blow these parts dry with clean, dry air.

4. Using a Q-tip, apply a thin film of W. F. Nye Gel Lubricant, #813S (Fluke PN

926084), to the entire surface of the ptf pattern and the hole in the center of the pattern. It is important that the grease be applied in a film of consistent thickness such that grease does not accumulate on the ptf wiper contacts. Remove excess grease with a dry Q-tip. No portion of the ptf pattern should be left unlubricated.

5. Push and secure the ptf contact assembly back on to the switch shaft.

6. Reassemble the circuit assembly, the shields, and case halves as described earlier

under “Reassembling the Meter Case”.

7. Perform the procedures under “Performance Tests”.

Performance Tests

The following performance tests verify the complete operability of the Meter and check the accuracy of each Meter function against the Meter’s specifications.

Accuracy specifications are valid for a period of one year after calibration, when measured at an operating temperature of 18°C to 28°C and at a maximum of 90 % relative humidity.

To perform the following tests, it is not necessary to open the case; no adjustments are necessary. Merely make the required connections, apply the designated inputs, and determine if the reading on the Meter display falls within the acceptable range indicated.

If the Meter fails any of these tests, it needs calibration adjustment or repair.

A Basic Operability Test

To check the basic operability of an 80 Series III Multimeter, do the following:

1. Turn the rotary switch to

inputs. (If you are using a test probe, touch the half of the input contact nearest the LCD.)

Ω and connect a test lead from the Vto the mA µA

The display should read 1.000 kΩ ± 5 digits.

2. With the rotary switch still at

end of the test lead into the

The beeper emits an Input Alert tone if the fuse is good.

Ω, test the A input fuse (11 A) by inserting the plug

A input.

3. Then test the mA µA input fuse (0.440 A) by inserting the plug end of the test lead

into the The beeper emits an Input Alert tone if the fuse is good.

If the Meter fails to operate properly:

• Check the battery and fuses and replace as needed.

• Verify that you are operating the Meter correctly by reviewing the operating

instructions found in the Users Manual.

To complete a comprehensive performance test and verify the accuracy of each Meter

function and operation, perform the remainder of the tests under “Performance Tests”.

Testing the Display

Turn the Meter on and press any push-button to hold the Meter in Display Test mode. Compare the display with the appropriate example in Figure 4.

MULTIMETER

III

TRUE RMS MULTIMETER

III

mA µA input.

TRUE RMS MULTIMETER

III

Multimeters

Performance Tests

Testing the Rotary Switch

This test verifies the operation of the rotary switch function selector. The function selector circuit relies on the interface between a ptf region on the circuit

assembly and a rotating contact assembly on the switch shaft. The rotary switch test exercises this interface by checking the various range codes and displaying their representative numbers.

To perform the rotary switch test, do the following:

1. Hold down Kwhile turning the rotary switch from

2. Release K.

Normal Meter functions are now disabled, and a number appears in the display.

3. Compare the number on the display with the number for the V dc (L) function in

Table 3.

The display should read -32 (±12).

4. Repeat this test for each position on the rotary switch.

5. To exit the rotary switch test mode, turn the rotary switch to

function selection.

Figure 4. Display Test

ek9f.eps

OFF to L.

OFF, then back to any

80 Series III

Service Information

Rotary Switch Position Display (±12) Rotary Switch Position Display (±12)

Table 3. Rotary Switch Test

OFF V ac V dc

mV dc

N/A

-32

-64

Continuity/Ohms Diode test mA/A µA

Testing the AC Voltage Function

To verify accuracy in the ac voltage ranges, do the following:

1. Connect the Calibrator to the Vand COM inputs on the Meter.

2. Set the Calibrator for the voltage and frequency called for in step 1 of Table 4.

3. Compare the reading on the Meter display with the display reading for your 80

Series III model (83, 85, or 87) shown in Table 4.

If the display reading falls outside of the range shown in Table 4, the Meter does not

meet specification.

4. Repeat this procedure for steps 2 through 17 of Table 4.

Table 4. AC Voltage Test

Input Display Reading

Step Voltage Frequency 83 Series III 85/87 Series III

1 350.0 mV 60 Hz 347.8 to 352.2 347.1 to 352.9

-96

-128

-160

-192

2 350.0 mV 1 kHz 346.1 to 353.9 346.1 to 353.9 3 350.0 mV 5 kHz 342.6 to 357.4 342.6 to 357.4 4 350.0 mV 20 kHz NA 341.0 to 359.0 5 3.500 V 60 Hz 3.480 to 3.520 3.473 to 3.527 6 3.500 V 1 kHz 3.461 to 3.539 3.461 to 3.539 7 3.500 V 5 kHz 3.426 to 3.574 3.426 to 3.574 8 3.500 V 20 kHz NA 3.410 to 3.590 9 35.00 V 60 Hz 34.80 to 35.20 34.73 to 35.27 10 35.00 V 1 kHz 34.61 to 35.39 34.61 to 35.39 11 35.00 V 5 kHz 34.26 to 35.74 34.26 to 35.74 12 35.00 V 20 kHz NA 34.10 to 35.90 13 350.0 V 60 Hz 348.0 to 352.0 347.3 to 352.7 14 350.0 V 1 kHz 346.1 to 353.9 346.1 to 353.9 15 350.0 V 2.5 kHz 342.6 to 357.4 342.6 to 357.4 16 900V 60 Hz 893 to 907 892 to 908 17 900 V 1 kHz 887 to 913 887 to 913

Testing the Frequency Function

To verify the accuracy of the Meter’s frequency function, do the following:

1. Connect the Calibrator to the Vand COM inputs on the Meter.

The accuracy of the Calibrator’s frequency function must be appropriate

for the specified accuracy of the Meter.

2. With the Meter in the 400 mV ac range, press F to enter the Frequency

Counter mode.

3. Set the Function Generator for the sine wave voltage and frequency called for in step

1 of Table 5.

4. Compare the reading on the Meter display with the display reading shown in Table

5. If the display reading falls outside of the range shown in Table 5, the Meter does not

meet specification.

6. Set the Function Generator for the sine wave voltage and frequency called for in step

2 of Table 5 and compare the reading on the Meter display with the display reading shown in Table 5.

Multimeters

Performance Tests

Note

Table 5. Frequency Test

Sine Wave Input

Step Voltage Frequency

1 2

150 mV rms 150 mV rms

19.000 kHz

190.00 kHz

Testing the Frequency Sensitivity and Trigger Level

To verify the counter sensitivity and trigger levels for all frequency modes and ranges, do the following. (For any function and range, the sensitivity and trigger level is the same in both frequency and duty cycle modes.)

1. Connect the Calibrator to the Vand COM inputs on the Meter.

2. Put the Meter in the 4 V ac range, and press F.

3. Apply the input from step 1 of Table 6, and compare the reading on the Meter

display with the display reading in Table 6.

4. Put the Meter in the 4 V dc range, and press F.

5. Apply the input from steps 2 and 3 of Table 6, and compare the reading on the Meter

display with the display reading in Table 6.

If the display reading falls outside of the range shown in Table 6, the Meter does not

meet specification.

Display Reading

83/85/87

18.998 to 19.002

189.98 to 190.02

6. On the Meter, press Kto enter the 40 V dc range.

7. Apply the input for steps 4 and 5 of Table 6, compare the reading on the Meter

display with the display reading in Table 6.

80 Series III

Service Information

Testing DC Voltage

Table 6. Frequency Counter Sensitivity and Trigger Level Tests

Step Range Amplitude (RMS) Frequency Display Reading

1 4 V ac 300 mV ac 1 kHz 999.8 - 1000.2 2 4 V dc 1.7 V ac 1 kHz 999.8 - 1000.2 3 4 V dc 1.0 V ac 1 kHz 000.0 4 40 V dc 6.0 V ac 1 kHz 999.8 - 1000.2 5 40 V dc 2.0 V ac 1 kHz 000.0

To verify accuracy of the dc voltage function, do the following. (A separate performance test procedure for mV dc is provided later in this section).

1. Connect the Calibrator to the Vand COM inputs on the Meter.

2. Turn the rotary switch to L.

3. Apply the input from step 1 of Table 7 for your model 80 Series III.

4. Compare the reading on the Meter display with the display reading in Table 7.

If the display reading falls outside of the range shown in Table 7, the Meter does not

meet specification.

5. Repeat steps 3 and 4 for the remaining inputs shown in Table 7.

Table 7. DC Voltage Test

Display Reading

Step DC Input Voltage 83 III 85 III 87 III

1 2 3 4 5

3.500 V

35.00 V

-35.00 V

350.0 V 1000 V

3.495 to 3.505

34.95 to 35.05

-34.95 to -35.05

349.5 to 350.5 998 to 1002

3.496 to 3.504

34.96 to 35.04

-34.96 to -35.04

349.6 to 350.4 998 to 1002

Testing the PEAK MIN MAX Function ( Model 87 only)

To check minimum/maximum (MIN MAX) feature of the Model 87.

1. Connect the Calibrator to the Vand COM inputs on the Meter.

2. Apply 2.0 V ac at 60 Hz (step 1, Table 8) from the Calibrator to the Vand

COM inputs of the Meter.

3. Turn the rotary switch to L (dc volts for dc-coupling of the input) or K (ac volts for

capacitive-coupling of the input).

3.497 to 3.503

34.97 to 35.03

-34.97 to -35.03

349.7 to 350.3 998 to 1002

Note

The rms converter is not used in Peak mode. The digital display

represents the actual peak value of the input.

4. Press M.

5. Press the T(beeper) to enter the

PEAK MIN MAX mode and begin displaying

maximum values.

6. Compare the reading on the Meter display to the display reading for step 1 in

Table 8.

If the display reading falls outside of the range shown in Table 8, the Meter does not

meet specification.

7. Press Mto begin displaying minimum values.

8. Compare the reading on the Meter display to the display reading for step 2 in

Table 8.

Table 8. Peak MIN MAX Test

AC Input Display Reading

Step Voltage Frequency 83 III 85 III 87 III

Multimeters

Performance Tests

1 2

2.0 V

60 Hz 60 Hz

Testing the mV DC Function

To test the accuracy of the mV dc function, do the following:

1. Connect the Calibrator to the Vand COM inputs on the Meter.

2. Turn the rotary switch to

3. Apply 350.0 mV.

4. Compare the reading on the Meter display to the display reading for your Model

shown below.

Model 83 III 348.8 to 351.2 Model 85 III 349.5 to 350.5 Model 87 III 349.5 to 350.5

If the display reading falls outside of the range shown, the Meter does not meet specification.

Testing the Resistance Function

To verify the accuracy of the resistance function, do the following:

1. Connect the Calibrator to Vand COM on the Meter.

mL .

N/A N/A

2.705 to 2.951

-2.705 to -2.951

2. Turn the rotary switch to

Ω

3. Apply the inputs for steps 1-5 in Table 9.

Compare the Meter display readings to the display readings for your Model of

Meter.

4. Press Kon the Meter to enter the 40-nanosiemen range used for conductance

tests of high resistances. Then proceed with step 6 of Table 9.

80 Series III

Service Information

Testing the Capacitance Function

Table 9. Ohms Tests

Display Reading

Step Resistance 83 III 85 III 87 III

1 short To zero resistance in leads, short probes and press REL ∆. 2 190.0Ω 189.0 to 191.0 189.4 to 190.6 189.4 to 190.6 3 19.00 kΩ 18.91 to 19.09 18.95 to 19.05 18.95 to 19.05 4 1.900 MΩ 1.886 to 1.914 1.888 to 1.912 1.888 to 1.912 5 19.00 MΩ 18.78 to 19.22 18.78 to 19.22 18.78 to 19.22

6 100.0 MΩ 9.80 to 10.20 nS 9.80 to 10.20 nS 9.80 to 10.20 nS

The Meter measures capacitance by charging the capacitor with a known direct current, measuring the resultant voltage, and calculating the capacitance. If the same capacitance is measured on an impedance bridge, a different reading may result. This variance is likely to be greater at higher frequencies.

To verify the accuracy of the capacitance measuring function, do the following:

1. Connect the Calibrator to the Vand COM inputs on the Meter.

2. For steps 1 through 3 in Table 10: a. Turn the rotary switch to ReE. b. Press the blue button. c. Connect the test leads to the capacitor. d. For each input, compare the readings on the Meter display to display readings

for your Model of Meter.

The Meter selects the proper range automatically. Each measurement takes about

one second per range.

3. Before applying the input for step 4 of Table 10, disconnect the test leads from the calibrator and press the D to zero the display (automatically subtracts the residual Meter and test lead capacitance). Reconnect the test leads to the calibrator and apply the input for step 4 of Table 10. Note that the relative mode puts the Meter into manual Range.

Table 10. Capacitance Tests

Display Reading

Step Capacitance 83 III 85 III 87 III

1 2 3 4

1.0 µF

0.470 µF

0.0470 µF

4.70 nF

0.95 to 1.05

0.462 to 0.478

0.0462 to 0.0478

4.62 to 4.78

0.95 to 1.05

0.462 to 0.478

0.0462 to 0.0478

4.62 to 4.78

0.95 to 1.05

0.462 to 0.478

0.0462 to 0.0478

4.62 to 4.78

Checking the Diode Test Function

To check the diode test function, do the following:

1. Connect the Calibrator to the Vand COM inputs on the Meter.

2. Turn the rotary switch to G.

If you use a Fluke 5100 Series Calibrator, activate the 50

override.

3. Apply 3.000 V. The Meter display should read 3.000 V dc +/- 0.061 V dc.

Testing the Milliamp (mA) Function

To verify the accuracy of AC and DC current measurement functions, do the following:

Note

Ω

divider

Multimeters

Performance Tests

1. Connect the Calibrator to the

2. Turn the rotary switch to The Meter enters the DC measurement function

mA µA and COM inputs on the Meter.

mA/AC.

3. Apply the inputs in steps 1 and 2 in Table 11.

4. For each input, compare the readings on the Meter display to the display readings for your Model of Meter.

5. Press the blue button on the Meter to toggle to AC measurement function.

6. Apply the inputs in steps 3 through 6 in Table 11.

7. For each input, compare the readings on the Meter display to the display readings for your Model of Meter.

Table 11. mA Tests

Display Reading

Step

1 2

3 4 5 6

DC Current

35.00 mA

350.0 mA

AC Current Frequency 83 III 85 III 87 III

35.00 mA

350.0 mA

60 Hz

1.0 kHz 60 Hz

1.0 kHz

83 III 85 III 87 III

34.82 to 35.18

348.4 to 351.6

34.56 to 35.44

345.6 to 354.4

34.89 to 35.11

349.1 to 350.9

34.63 to 35.37

346.3 to 353.7

34.89 to 35.11

349.1 to 350.9

34.63 to 35.37

346.3 to 353.7

Testing the Microamp (µA) Function

To verify the accuracy of the microamp (µA) measurement function, do the following:

1. Connect the Calibrator to the

2. Turn the rotary switch to The Meter enters the DC measurement function.

µAC.

3. Apply the inputs in steps 1 and 2 of Table 12.

4. For each input, compare the readings on the Meter display to the display readings for your Model of Meter.

5. Press the blue button on the Meter to toggle to the AC measurement function.

6. Apply the inputs in steps 3 and 6 of Table 12.

mA µA and COM inputs on the Meter.

80 Series III

Service Information

Step DC Current 83 III 85 III 87 III

7. For each input, compare the readings on the Meter display to the display readings for your Model of Meter.

Table 12. µA Tests

Display Reading

1 2

AC Current Frequency 83 III 85 III 87 III

3 4 5 6

350.0 µA

350.0 µA 3500 µA 3500 µA

350.0 µA 3500 µA

60 Hz

1.0 kHz 60 Hz

1.0 kHz

Testing the Amp (A) Function

To verify the accuracy in the ampere (A) measurement function, do the following:.

1. If necessary, set the Calibrator output to 0.

2. Connect the Calibrator to the

3. Turn the rotary switch to

The Meter enters the DC amp measurement function.

4. Apply the inputs in steps 1 and 2 in Table 13.

5. For each input, compare the readings on the Meter display to the display readings for

your Model of Meter.

6. Set the calibrator output to 0.

7. Press the blue button on the Meter to toggle to the AC amp measurement function.

348.2 to 351.8 3484 to 3516

345.6 to 354.4

345.6 to 354.4 3456 to 3544 3456 to 3544

348.9 to 351.1 3491 to 3509

346.3 to 353.7

346.3 to 353.7 3463 to 3537 3463 to 3537

A and COM inputs of the Meter.

mA/AC.

348.9 to 351.1 3491 to 3509

346.3 to 353.7

346.3 to 353.7 3463 to 3537 3463 to 3537

8. Apply the inputs in steps 3 through 6 in Table 13.

9. For each input, compare the readings on the Meter display to the display readings for

your Model of Meter.

Table 13. Current Tests

Display Reading

Step DC Current 83 III 85 III 87 III

1 2

AC Current Frequency 83 III 85 III 87 III

3 4 5 6

3500 mA 3500 mA

10.00 A

3500 mA

10.00A

60 Hz

1.0 kHz 60 Hz

1.0 kHz

3482 to 3518

9.94 to 10.06

3456 to 3544 3456 to 3544

9.86 to 10.14

3489 to 3511

9.96 to 10.04

3463 to 3537 3463 to 3537

9.88 to 10.12

3489 to 3511

9.96 to 10.04

3463 to 3537 3463 to 3537

9.88 to 10.12

Calibration

Calibrate the Meter once a year to ensure that it performs according to specifications. Calibration adjustment points are identified in Figure 5. There is a slightly different calibration procedure for each model of the 80 Series III. Be

sure to follow the correct procedure for your unit.

Calibrating the Model 85 and 87 II I

To calibrate the Meter, perform the following procedure:

1. Set the Calibrator for 0 V dc.

2. Put the Model 85 III or 87 III in the L function.

3. Connect the Calibrator to the Vand COM inputs on the Meter.

4. Output 3.500 V dc from the Calibrator.

Adjust R21 to obtain a Meter display reading of 3.500 ±0.001.

5. Put the Model 85 III or 87 III in the K function.

6. Output 3.513 V at 50 Hz from the Calibrator.

Multimeters

Calibration

Adjust R34 to obtain a Meter display reading 3.500 ±0.002.

Note

The disparity between an input 3.513 and a display reading of 3.500 is

due to compensation for the RMS converter linearity.

7. Output 100 V at 20 kHz from the Calibrator.

Adjust C37 to obtain a Meter display reading of 100.0 ±0.2.

8. Output 3.500 V at 10 kHz from the Calibrator.

Adjust C2 to obtain a Meter display reading of 3.500 ±0.004.

9. Output 35.00 V at 10 kHz from the Calibrator. Adjust C3 to obtain a Meter display reading of 35.00 ±0.04.

80 Series III

Service Information

C3 C2 C37 (87 and 85)

R34 R21

Figure 5. Calibration Adjustment Points

ek6f.eps

Calibrating the Model 83 II I

To calibrate the Model 83 III, perform the following procedure:

1. Set the Calibrator for 0 V dc.

2. Put the Model 83 III in the L function.

3. Connect the source to the Vand COM inputs on the Meter.

4. Output 3.500 V dc from the Calibrator.

Adjust R21 to obtain a Meter display reading of 3.500 +/-0.001.

5. Put the Meter in to the K function.

6. Output 3.500 V at 100 Hz from the Calibrator.

Adjust R34 to obtain a Meter display reading of 3.500 ±0.002.

7. Output 100 V at 20 kHz from the calibrator. Adjust C37 to obtain a meter display ready of 100.0 ± 0.2.

8. Output 3.500 V at 10 kHz from the Calibrator.

Adjust C2 to obtain a Meter display reading of 3.500 ±0.004.

9. Output 35.00 V at 10 kHz.

Multimeters

Parts and Accessories

Adjust C3 to obtain a Meter display reading of 35.00 ±0.04.

Parts and Accessories

Replacement parts and accessories are listed in Tables 14, 15 and shown in Figure 6.

Table 14. Replacement Parts

Item Description Fluke Part No Qty

BT1 Battery, 9 V 614487 1 F1 W Fuse, 0.440 A, 1000 V, FAST 943121 1 F2 W Fuse, 11 A, 1000 V, FAST 803293 1 H1 Screw, Case 832246 3 H5,H6 Fastener, Access Door 948609 MP1 Foot, Non-Skid 824466 2 MP2 O-Ring, Input Receptacle 831933 1 MP85 Case Top (pad xfer), w/window 616885 (83 III ,85 III)

616877 (87 III) MP86 Btm Case w/gasket 8x-w/ce/csa 616703 MP92 Battery Door-CE update 609930 TM1 CD-ROM (contains Users Manuals) 1611720 1 TM2 Getting Started Manual 1611712 1 TM3 Quick Reference Guide, Fluke 80 Series III 688168 1 TM4 Service Information Manual 688645 Optional Backlight Backlight, White 609922 LCD LCD, 4.5 digit, bar graph, multiplexed 686634 (83 III, 85 III)

686391 (87 III) WTo ensure safety, use exact replacement only.

80 Series III

Service Information

TL20 Industrial Test Lead Set (Optional) TL20  AC70A Alligator Clips for use with TL75 test lead set AC70A 1 TL75 Test Lead Set TL75 1 TL24 Test Lead Set, Heat-Resistant Silicone TL24  TP1 Test Probes, Flat Blade, Slim Reach TP1  TP4 Test Probes, 4 mm diameter, Slim Reach TP4  AC20 Safety Grip, Wide-Jaw Alligator Clips AC20  C81Y Holster, Yellow C81Y 1 C81G Holster, Gray (Optional) C81G  C25 Carrying Case, Soft (Optional) C25  * Fluke accessories are available from your authorized Fluke distributor.

Table 15. Accessories*

Item Description

Fluke Part

Number Quantity

MP85

MP2

MP86

BT1

H5, 6

MP92

T24 Test Lead Set

TP1, TP4 Probes

87/E Test Lead Set

MP1

Figure 6. Replaceable Parts

AC20 Alligator

Clip (Black)

TL75

Test Lead Set

C81Y

AC70A

Alligator Clips

IY11F.EPS

Fluke 87 III, 85 III, 83 III, 80 III Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Lifetime Limited Warranty

Table of Contents

List of Tables

List of Figures

Introduction

Precautions and Safety Information

International Symbols

Safety Information

Specifications

Accuracy

General

AC Voltage Specifications (Models 85 and 87)

AC Voltage Specifications (Model 83)

DC Voltage, Resistance, and Conductance Specifications

Current Specifications

Capacitance and Diode Function Specifications

Frequency Counter Specifications

Frequency Counter Sensitivity and Trigger Levels

MIN MAX Recording Specifications

Electrical Characteristics of the Termi nal s

Required Equipment

Basic Maintenance

Opening the Meter Case

Removing and Reinserting the Circuit Board Assembl y

Reassembling the Meter Case

Replacing the Battery

Testing Fuses (F1 and F2)

Replacing Fuses

Cleaning

Input Terminals

Rotary Switch

Performance Tests

A Basic Operability Test

Testing the Display

Testing the Rotary Switch

Testing the AC Voltage Function

Testing the Frequency Function

Testing the Frequency Sensitivity and Trigger Level

Testing DC Voltage

Testing the PEAK MIN MAX Function ( Model 87 only)

Testing the mV DC Function

Testing the Resistance Function

Testing the Capacitance Function

Checking the Diode Test Function

Testing the Milliamp (mA) Function

Testing the Microamp (µA) Function

Testing the Amp (A) Function

Calibration

Calibrating the Model 85 and 87 II I

Calibrating the Model 83 II I

Parts and Accessories