Fluke 87 III Series Operating and installation instructions
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 accompanyingthe 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
i
Table of Contents
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
ii
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
iii
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
80 Series III
Service Manual
iv
v
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
vi
1
Introduction
WWarning
To avoid shock or injury, do not perform the verification tests
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.
Caution
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
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
2
Precautions and Safety Information
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
International symbols used on the Meter and in this manual are explained in Table 1.
Table 1. International Symbols
Symbol Meaning Symbol Meaning
Alternating current Earth ground
Direct current Fuse
Alternating or direct current Conforms to European Union
directives
Refer to the manual. Important
information. Conforms to relevant Canadian
Standards Association directives
Take appropriate precautions.
Hazardous voltage may be present TDouble insulated
Battery OIEC overvoltage category III
Multimeters
Safety Information
3
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.
•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
4
Specifications
Accuracy
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.
General
Maximum Voltage between any Terminal
and Earth Ground 1000 V rms
WFuse Protection for mA or µA inputs
WFuse Protection for A input 44/100 A, 1000 V FAST Fuse
11 A, 1000 V FAST Fuse
Display Digital: 4000 counts updates 4/sec; (Model 87 also has
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.
Temperature Operating: -20 °C to +55 °C;
Storage: -40 °C to +60 °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
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.
Relative Humidity 0 % to 90 % (0 °C to 35 °C);
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 alkaline (with backlight off)
Shock Vibration Per MIL-T-28800 for a Class 2 instrument
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 cm)
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 cm)
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
to 1000 V Overvoltage Category III. UL listed to UL3111-1.
Licensed by TÜV to EN61010-1.
Multimeters
Specifications
5
AC Voltage Specifications (Models 85 and 87)
Function Range Resolution Accuracy1
50-60 Hz 45 Hz - 1 kHz 1-5 kHz 5-20 kHz2
K3400.0 mV
4.000 V
40.00 V
400.0 V
1000 V
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)5
±(2.0 % + 4)
±(2.0 % + 4)
±(2.0 % + 4)
±(2.0 % + 4)4
unspecified
±(2.0 % + 20)
±(2.0 % + 20)
±(2.0 % + 20)
unspecified
unspecified
1. For extended use at high RH, change the 400 mV and 4.0 V ac accuracy specification to ±(1.5 % + 4 counts) for 45
Hz to 1 kHz and ±(3.0 % + 25 counts) for 5 kHz to 20 kHz.
2. Below 10 % of range, add 6 counts.
3. Models 85 and 87 are true rms responding Meters. When the input leads are shorted together in the ac functions,
the Meters display a reading (typically <25 counts) caused by internal amplifier noise. The accuracy on Models 85
and 87 is not significantly affected by this internal offset when measuring inputs that are within 5 % to 100 % of the
selected range. When the rms value of the two values (5 % of range and internal offset) is calculated, the effect is
minimal as shown in the following example where 20.0 = 5 % of 400 mV range, and 2.5 is the internal offset: RMS =
SQRT[(20.0)2+ (2.5)2] = 20.16. If you use the REL function to zero the display when using the ac functions, a
constant error that is equal to the internal offset will result.
4. Frequency range: 1 kHz to 2.5 kHz.
5. Below 10 % of range, add 16 counts.
AC Voltage Specifications (Model 83)
Function Range Resolution Accuracy1
50 Hz - 60 Hz 45 Hz - 1 kHz 1 kHz - 5 kHz
K2400.0 mV
4.000 V
40.00 V
400.0 V
1000 V
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)3
unspecified
1. For extended use at high RH, change the 400 mV and 4.0 V ac accuracy specification to ±(1.5 % + 4 counts) for
45 Hz to 1 kHz and ±(3.0 % + 25 counts) for 5 kHz to 20 kHz.
2. Below a reading of 200 counts, add 10 counts.
3. Frequency range: 1 kHz to 2.5 kHz.
DC Voltage, Resistance, and Conductance Specifications
Accuracy1
Function Range Resolution Model 83 Model 85 Model 87
L4.000 V
40.00 V
400.0 V
1000 V
0.001 V
0.01 V
0.1 V
1 V
±(0.1 % + 1)
±(0.1 % + 1)
±(0.1 % + 1)
±(0.1 % + 1)
±(0.08 % + 1)
±(0.08 % + 1)
±(0.08 % + 1)
±(0.08 % + 1)
±(0.05 % + 1)
±(0.05 % + 1)
±(0.05 % + 1)
±(0.05 % + 1)
F
mV 400.0 mV 0.1 mV ±(0.3 % + 1) ±(0.1 % + 1) ±(0.1 % + 1)
e
nS
400.0 Ω
4.000 kΩ
40.00 kΩ
400.0 kΩ
4.000 MΩ
40.00 MΩ
40.00 nS
0.1 Ω
0.001 kΩ
0.01 kΩ
0.1 kΩ
0.001 MΩ
0.01 MΩ
0.01 nS
±(0.4 % + 2)2
±(0.4 % + 1)
±(0.4 % + 1)
±(0.7 % + 1)
±(0.7 % + 1)
±(1.0 % + 3)
±(1.0 % + 10)
±(0.2 % + 2)2
±(0.2 % + 1)
±(0.2 % + 1)
±(0.6 % + 1)
±(0.6 % + 1)
±(1.0 % + 3)
±(1.0 % + 10)
±(0.2 % + 2)2
±(0.2 % + 1)
±(0.2 % + 1)
±(0.6 % + 1)
±(0.6 % + 1)
±(1.0 % + 3)
±(1.0 % + 10)
1. For extended use at high RH, change the 400 mV and 4.0 V ac accuracy specification to ±(1.5 % + 4 counts) for
45 Hz to 1 kHz and ±(3.0 % + 25 counts) for 5 kHz to 20 kHz.
2. When using the REL ∆function to compensate for offsets.
80 Series III
Service Information
6
Current Specifications
Accuracy1
Function Range Resolution Model 832Model 853,4 Model 873,4 Burden
Voltage
(typical)
mA \
(45 Hz to
2 kHz)
40.00 mA
400.0 mA
4000 mA
10.00 A5
0.01 mA
0.1 mA
1 mA
0.01 A
±(1.2 % + 2)6
±(1.2 % + 2)6
±(1.2 % + 2)6
±(1.2 % + 2)6
±(1.0 % + 2)6
±(1.0 % + 2)6
±(1.0 % + 2)6
±(1.0 % + 2)6
±(1.0 % + 2)
±(1.0 % + 2)
±(1.0 % + 2)
±(1.0 % + 2)
1.8 mV/mA
1.8 mV/mA
0.03 V/A
0.03 V/A
mA [40.00 mA
400.0 mA
4000 mA
10.00 A5
0.01 mA
0.1 mA
1 mA
0.01 A
±(0.4 % + 4)
±(0.4 % + 2)
±(0.4 % + 4)
±(0.4 % + 2)
±(0.2 % + 4)
±(0.2 % + 2)
±(0.2 % + 4)
±(0.2 % + 2)
±(0.2 % + 4)
±(0.2 % + 2)
±(0.2 % + 4)
±(0.2 % + 2)
1.8 mV/mA
1.8 mV/mA
0.03 V/A
0.03 V/A
µA B
(45 Hz to
2 kHz)
400.0 µA
4000 µA0.1 µA
1 µA±(1.2 % + 2)6
±(1.2 % + 2)6±(1.0 % + 2)6
±(1.0 % + 2)6±(1.0 % + 2)
±(1.0 % + 2) 100 µV/µA
100 µV/µA
µAF400.0 µA
4000 µA0.1 µA
1 µA±(0.4 % + 4)
±(0.4 % + 2) ±(0.2 % + 4)
±(0.2 % + 2) ±(0.2 % + 4)
±(0.2 % + 2) 100 µV/µA
100 µV/µA
1. For extended use at high RH, change the 400 mV and 4.0 V ac accuracy specification to ±(1.5 % + 4 counts) for
45 Hz to 1 kHz and ±(3.0 % + 25 counts) for 5 kHz to 20 kHz.
2. AC conversion for Model 83 is ac coupled and calibrated to the rms value of a sinewave input.
3. AC conversions for Models 85 and 87 are ac coupled, true rms responding, and valid from 5 % to 100 % of
range.
4. See note 2 in under “AC Voltage Specifications (Models 85 and 87).”
5. 10 A continuous; 20 A for 30 seconds maximum: Accuracy unspecified over 10 A.
6. Below a reading of 200 counts, add 10 counts.
Capacitance and Diode Function Specifications
Function Range Resolution Accuracy1
E5.00 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)
G3.000 V 0.001 V ±(2 % + 1)
1. With a film capacitor or better, using Relative mode to zero residual. See “Accuracy” earlier in the specifications
for a complete explanation.
Frequency Counter Specifications
Function Range Resolution Accuracy1
Frequency
(0.5 Hz to 200 kHz,
pulse width >2 µs)
199.99
1999.9
19.999 kHz
199.99 kHz
>200 kHz
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
1. See “Accuracy” earlier in the specifications for a complete explanation.
Multimeters
Specifications
7
Frequency Counter Sensitivity and Trigger Levels
Minimum Sensitivity (RMS Sinewave) Approximate Trigger Level
Input Range15 Hz - 20 kHz 0.5 Hz - 200 kHz (DC Voltage Function)
400 mV dc
400 mV dc
4 V
40 V
400 V
1000 V
70 mV (to 400 Hz)
150 mV
0.3 V
3 V
30 V
300 V
70 mV (to 400 Hz)
150 mV
0.7 V
7 V (≤140 kHz)
70 V (≤14.0 kHz)
700 V (≤1.4 kHz)
40 mV
1.7 V
4 V
40 V
400 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
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.
1. Maximum input for specified accuracy = 10X Range or 1000 V.
MIN MAX Recording Specifications
Model Nominal
Response Accuracy
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).
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
8
Electrical Characteristics of the Terminals
LOverload Protection1:1000 V rms
Input Impedance (nominal): 10 MΩ<100 pF
Common Mode Rejection Ratio: >120 dB at dc, 50 Hz or 60 Hz
(1 kΩunbalance)
Normal Mode Rejection: >60 dB at 50 Hz or 60 Hz
mAOverload Protection1:1000 V rms
Input Impedance (nominal): 10 MΩ<100 pF
Common Mode Rejection Ratio: >120 dB at dc, 50 Hz or 60 Hz
(1 kΩunbalance)
Normal Mode Rejection: >60 dB at 50 Hz or 60 Hz
KOverload Protection1:1000 V rms
Input Impedance (nominal): 10 MΩ<100 pF (ac-coupled)
Common Mode Rejection Ratio: >60 dB, dc to 60 Hz
(1 kΩunbalance)
eOverload Protection1:1000 V rms
Open Circuit Test Voltage: <1.3 V dc
Full Scale Voltage: To 4.0 MΩ: <450 mV dc
40 MΩor nS V1.3 V dc
Typical Short Circuit Current: 400 Ω: 200 µA
4 kΩ: 80 µA
40 kΩ: 12 µA
400 kΩ: 1.4 µA
4 MΩ: 0.2 µA
40 MΩ: 0.2 µA
GOverload Protection1:1000 V rms
Open Circuit Test Voltage: <3.9 V dc
Full Scale Voltage: 3.000 Vdc
Typical Short Circuit Current: 0.6 mA typical
1. 106V 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.
Multimeters
Basic Maintenance
9
Table 2. Required Equipment
Equipment Required Characteristics Recommended Model
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 %
Fluke 5500A Multi-Product
Calibrator or equivalent
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.
Opening the Meter Case
Caution
To avoid unintended circuit shorting, always place the
uncovered Meter assembly on a protective surface. When the
case of the Meter is open, circuit connections 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.
Note
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.
6. Gently unsnap the case top at the display end. (See Figure 2).
80 Series III
Service Information
10
Align Tab
to off
ek7f.eps
Figure 1. Disassembly Details
Removing and Reinserting the Circuit Board Assembly
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
11
F1
F2
1
IY12.eps
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 OFF position, and
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.
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
12
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 Ainput 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 Ωand 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 Ainput terminal to the mA µAinput terminal.
The display should read between 0.995 kΩand 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.
87
TRUE RMS MULTIMETER
MIN MAX RANGE HOLD
H
HzREL
mA
A
mV
V
V
OFF
!
!
ACOM V
mA µA
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µA
CAT II
!
1000V MAX
CAT II
87
TRUE RMS MULTIMETER
MIN MAX RANGE HOLD
H
HzREL
mA
A
mV
V
V
OFF
!
!
ACOM V
mA µA
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µA
CAT II
!
1000V MAX
CAT II
Good F2 fuse: 00.0Ω to
00.5Ω
Good F1 fuse: 0.995 KΩ to
1.005KΩ
Replace fuse: OL
Replace fuse: OL
Touch top half
of input contacts
IY5f.eps
Figure 3. Testing the Current Input Fuses
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