Fluke 39 User manual

®
39/41B
Power Meter & Power Harmonics Analyzer
Service Manual
PN 601044
October 1995, Rev.1,9/00
© 1995,2000 Fluke Corporation, Inc. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke’s opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.
To obtain warranty service, 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. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 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.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. 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.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99
To contact Fluke, call one of the following telephone numbers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]
Or, visit Fluke's Web site at www.fluke.com.

i
Table of Contents
Chapter Title Page
1 Introduction and Specifications........................................................ 1-1
1-1. Introduction .......................................................................................... 1-3
1-2. Organization of the Service Manual..................................................... 1-3
1-3. Conventions.......................................................................................... 1-4
1-4. General Information ............................................................................. 1-4
1-5. Description....................................................................................... 1-4
1-6. Power Requirements ........................................................................ 1-4
1-7. Options, Accessories and Related Equipment.................................. 1-4
1-8. Operating Instructions...................................................................... 1-5
1-9. Specifications ....................................................................................... 1-5
2 Theory of Operation........................................................................... 2-1
2-1. Introduction .......................................................................................... 2-3
2-2. Functional Block Description............................................................... 2-3
2-3. Circuit Operation.................................................................................. 2-5
2-4. Power-Up Sequence......................................................................... 2-5
2-5. Normal Operation ............................................................................ 2-6
2-6. Circuit Descriptions.............................................................................. 2-6
2-7. Power Supplies................................................................................. 2-6
2-8. Power-On Circuit......................................................................... 2-6
2-9. VCC............................................................................................. 2-6
2-10. -22 Volts ...................................................................................... 2-7
2-11. VEE.............................................................................................. 2-7
2-12. VDD............................................................................................. 2-7
2-13. VSS.............................................................................................. 2-7
2-14. VREF........................................................................................... 2-7
2-15. Low Battery Detection................................................................. 2-8
2-16. Power Reset................................................................................. 2-8
2-17. Input Conditioning........................................................................... 2-8
2-18. Difference Amplifier (Voltage Input).......................................... 2-8
2-19. Protection Circuit (Current Channel)........................................... 2-8
2-20. Gain Amplifier............................................................................. 2-8
2-21. Latch (U1).................................................................................... 2-8
2-22. Anti-Alias Filter........................................................................... 2-9

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2-23. Level Shifter ................................................................................ 2-9
2-24. A/D Converters ................................................................................ 2-9
2-25. Digital Kernel................................................................................... 2-10
2-26. Digital Signal Processor (U2)...................................................... 2-10
2-27. Programmable Logic Device....................................................... 2-10
2-34. SRAMs (U5,U6,U7).................................................................... 2-13
2-35. EPROM (U4)............................................................................... 2-13
2-36. EEPROM (U11)........................................................................... 2-13
2-37. Serial EEPROM (U22) ................................................................ 2-13
2-38. Keypad............................................................................................. 2-13
2-39. Display............................................................................................. 2-13
2-40. LCD Module................................................................................ 2-13
2-41. BackLight .................................................................................... 2-14
2-42. Contrast Control - EEPOT (U8) ................................................. 2-14
2-43. Optical Interface (Model 41B Only)................................................ 2-14
2-44. Transmitter................................................................................... 2-14
2-45. Receiver....................................................................................... 2-14
3 General Maintenance......................................................................... 3-1
3-1. Introduction .......................................................................................... 3-3
3-2. Warranty Repairs and Shipping Information........................................ 3-3
3-3. General Maintenance Information........................................................ 3-3
3-4. Required Equipment......................................................................... 3-3
3-5. Static-Safe Handling ........................................................................ 3-3
3-6. Cleaning................................................................................................ 3-4
3-7. Disassembling the Tester...................................................................... 3-4
3-8. Removing the Meter Case Bottom................................................... 3-4
3-9. Removing the PCA and Input Module............................................. 3-5
3-10. Removing the LCD Module............................................................. 3-6
3-11. Removing the Elastomeric Keypad.................................................. 3-6
3-12. Reassembling the Tester....................................................................... 3-6
3-13. Installing the PCA and Input Module .............................................. 3-6
3-14. Reassembling the Case Bottom........................................................ 3-7
4 Performance Testing and Calibration............................................... 4-1
4-1. Introduction .......................................................................................... 4-3
4-2. Required Equipment............................................................................. 4-3
4-3. Performance Tests................................................................................ 4-4
4-4. Warming-Up the Tester.................................................................... 4-4
4-5. Checking the Display Pixels............................................................ 4-4
4-6. Testing Voltage Performance........................................................... 4-4
4-7. Testing Amps Performance.............................................................. 4-5
4-8. Testing Watts, VA, VAR Performance............................................ 4-8
4-9. Testing Record Mode Performance ................................................. 4-8
4-10. Testing Memory Mode Performance (Model 41B Only)................. 4-9
4-11. Testing Harmonics Volts Performance............................................ 4-9
4-12. Testing Harmonics Amps Performance ........................................... 4-10
4-13. Testing Serial I/O Performance (Model 41B Only)......................... 4-11
4-14. Calibrating the Tester........................................................................... 4-12
4-15. Introduction...................................................................................... 4-12
4-16. Entering Calibration Mode............................................................... 4-12
4-17. Making Calibration Adjustments..................................................... 4-16
4-18. Exiting the Calibration Mode........................................................... 4-17
4-19. Setting the Minimum Contrast Level ................................................... 4-18

Contents (continued)
iii
5 Troubleshooting................................................................................. 5-1
5-1. Introduction .......................................................................................... 5-3
5-2. General Troubleshooting...................................................................... 5-3
5-3. Starting with a Dead Tester (Model 41B Only)............................... 5-3
5-4. Troubleshooting the Power Supply...................................................... 5-5
5-5. Troubleshooting the Digital Section..................................................... 5-5
5-6. Troubleshooting the Digital Kernel ................................................. 5-6
5-7. Troubleshooting the A/D Converter Output..................................... 5-7
5-8. Troubleshooting the Keypad............................................................ 5-9
5-9. Troubleshooting the Range Control Circuit..................................... 5-10
5-10. Troubleshooting the EEPROM ........................................................ 5-11
5-11. Troubleshooting the LCD Display Module...................................... 5-12
5-12. Troubleshooting the Serial EEPROM.............................................. 5-13
6 List of Replaceable Parts................................................................... 6-1
6-1. Introduction .......................................................................................... 6-3
6-2. How to Obtain Parts ............................................................................. 6-3
6-3. Manual Status Information................................................................... 6-3
6-4. Newer Instruments................................................................................ 6-4
6-5. Parts Lists............................................................................................. 6-4
7 Schematic Diagrams.......................................................................... 7-1

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v
List of Tables
Table Title Page
2-1. Voltage Gains ........................................................................................................ 2-9
2-2. Current Gains......................................................................................................... 2-9
2-3. Memory Map ......................................................................................................... 2-11
2-4. Logic Truth Table.................................................................................................. 2-12
4-1. Recommended Test Equipment............................................................................. 4-3
4-2. Volts Performance ................................................................................................. 4-5
4-3. Amps Performance ................................................................................................ 4-7
4-4. Watts Performance, Line Frequency...................................................................... 4-8
4-5. Harmonics Performance for Volts......................................................................... 4-10
4-6. Harmonics Performance for Amps ........................................................................ 4-11
5-1. Power Supply Current Limits ................................................................................ 5-5
5-2. Power Supplies ...................................................................................................... 5-5
5-3. Latch Signals for Voltage Ranges.......................................................................... 5-10
6-1. Fluke 39 Final Assembly....................................................................................... 6-5
6-2. Fluke 39 A1 Main PCA......................................................................................... 6-7
6-3. Fluke 41B Final Assembly..................................................................................... 6-13
6-4. Fluke 41B A1 Main PCA....................................................................................... 6-16

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vii
List of Figures
Figure Title Page
2-1. Overall Functional Block Diagram........................................................................ 2-4
2-2. PLD Block Diagram .............................................................................................. 2-11
3-1. Removing the Case Bottom................................................................................... 3-5
3-2. Flex Cable Connector ............................................................................................ 3-6
4-1. Watts Performance Test Configuration ................................................................. 4-6
4-2. Battery Removal .................................................................................................... 4-13
4-3. Battery Spring Adjustment .................................................................................... 4-14
4-4. Calibration Access Hole ........................................................................................ 4-15
5-1. Test Point Locator.................................................................................................. 5-4
6-1. Fluke 39 Final Assembly....................................................................................... 6-6
6-2. Fluke 39 A1 Main PCA......................................................................................... 6-11
6-3. Fluke 41B Final Assembly..................................................................................... 6-15
6-4. Fluke 41B A1 Main PCA....................................................................................... 6-20

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1-1
Chapter 1
Introduction and Specifications
Title Page
1-1. Introduction............................................................................................ 1-3
1-2. Organization of the Service Manual ...................................................... 1-3
1-3. Conventions............................................................................................ 1-4
1-4. General Information............................................................................... 1-4
1-5. Description......................................................................................... 1-4
1-6. Power Requirements.......................................................................... 1-4
1-7. Options, Accessories and Related Equipment................................... 1-4
1-8. Operating Instructions........................................................................ 1-5
1-9. Specifications......................................................................................... 1-5

39/41B
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Introduction and Specifications
Introduction
1
1-3
1-1. Introduction
This service manual provides information on maintaining, troubleshooting, and repairing
the Fluke 39 Power Meter and Fluke 41B Power Harmonics Analyzer. The information
in this manual pertains to both models unless otherwise indicated. The Fluke 39 and 41B
share many features and are collectively referred to as “the Tester”. “Model 41B” is
mentioned when a description pertains to that model only. This manual includes the
following:
•Specifications
•Theory of operation
•Calibration procedure
•Performance testing and troubleshooting procedures
•Replacement parts lists
•Schematic diagrams
A meter under warranty will be promptly repaired or replaced (at Fluke’s option) and
returned at no charge. See the registration card for warranty terms. If the warranty has
expired, the meter will be repaired and returned for a fixed fee. Contact the nearest
Service Center for information and prices. A list of U.S. and International Service
Centers is included at the end of Chapter 6 of this manual.
1-2. Organization of the Service Manual
This service manual has the following chapters.
Chapter 1. Introduction and Specifications
Chapter 1 describes the Service Manual, explains special terminology and conventions,
and provides complete meter specifications.
Chapter 2. Theory of Operation
Chapter 2 treats the Tester’s circuitry as functional blocks, with a description of each
block’s role in overall operation. A detailed circuit description is then given for each
block. These descriptions explain operation to the component level and support the
troubleshooting and repair procedures in Chapter 5.
Chapter 3. General Maintenance
Chapter 3 provides information on general maintenance, handling precautions and
disassembly instructions. Instructions covering warranty repairs and shipping the
instrument to a service center are also contained in this section.
Chapter 4. Performance Testing and Calibration
Chapter 4 contains information on required test equipment, performance test procedures
and calibration of the instrument.
Chapter 5. Troubleshooting
Chapter 5 provides detailed repair procedures to the component level. Troubleshooting
and repair procedures rely on the Theory of Operation presented in Chapter 2 and the
Schematic Diagrams in Chapter 7.
Chapter 6. List of Replaceable Parts
Chapter 6 lists the parts used in the Tester as well as information on how and where to
order parts.

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1-4
Chapter 7. Schematic Diagrams
Chapter 7 contains the schematic diagrams for all assemblies and a list of mnemonic
definitions to aid in identifying signal name abbreviations.
1-3. Conventions
The following conventions are used in this manual:
•Printed Circuit Assembly (PCA)
A “pca” is a printed circuit board and its attached parts.
•Circuit Nodes
A pin or connection on a component is specified by a dash (-) and number following the
component reference designator. For example, pin 19 of U30 would be U30-19.
•User Notation
Switch positions used in the meter circuit descriptions correspond to those in the
schematic diagrams in Chapter 7.
1-4. General Information
1-5. Description
The Fluke 39 and 41B are handheld Testers used to measure voltage and current at
power line and harmonic frequencies. Using these inputs, the Tester automatically
calculates power and a wide range of other measurements useful in determining
harmonic distortion levels and sources.
These capabilities allow you to monitor power quality before and after an installation,
troubleshoot a power distribution system, and (with Model 41B) print out or download
data for additional analysis.
The Tester is both a harmonics measurement tool and a power meter or digital
multimeter. You can use the Tester to measure voltage events (undervoltage,
overvoltage, line outages, and neutral to ground levels), current levels, or to measure
power levels. Fundamental frequency measurements (to 100 Hz) and harmonic
frequency measurements (to about 2 kHz) are also possible.
1-6. Power Requirements
The Tester uses 4 Alkaline “C” Cells (ANSI/NEDA-14A, IEC-LR14) for primary power.
New Alkaline “C” Cells will provide a minimum of 24 hours of continuous operation
(typically 48 hours). You can also use NiCad batteries; however, depending on battery
condition, fully charged NiCad batteries provide 8 hours or less of continuous operation.
1-7. Options, Accessories and Related Equipment
The following accessories are supplied with the Fluke 39 and 41B:
•80i-500s AC Current Probe
•TL-24 Test Leads (Set of two, Red and Black)
•TP-20 Test Probes (2)
•AC-20 Test Clips (2)

Introduction and Specifications
Specifications
1
1-5
The following additional accessories are supplied with the Fluke 41B:
•RS-232 Cable
•9-Pin to 25-Pin Adapter
•Plug Adapter
•3.5 inch Micro-Floppy Disk (FlukeView™ 41 Software)
Optional accessories for both the Fluke 39 and 41B are as follows:
•80i-1000s AC Current Probe
•C41s Soft Carrying Case
1-8. Operating Instructions
Operating instructions for the Fluke 39 and 41B can be found in the Users Manual
(Fluke PN 942847). See How to Obtain Parts on page 6-1.
1-9. Specifications
Accuracy is specified for a period of one year after calibration.
Specifications expressed in the "±(2% + 3 digits)" format are saying that the error is a percent of
reading plus a number of least significant digits. The least significant digit is the smallest value that
can be displayed in a range and can be found in the resolution section of the Range and
Resolution specifications table.
When a harmonic error is expressed in the "13th (±(2% + 2 digits)) --- 31st (±(5% + 2 digits))" form, it
is indicating that there is a linear increase in error from the lower harmonic to the upper harmonic.
The error can be determined as a ratio of the desired harmonic to the number of harmonics in the
expression times the difference in error over the range plus the least error. For example, to find the
22nd Harmonic error from the above equation:
((Desired Harmonic - Lower Harmonic) / (Upper Harmonic - Lower Harmonic)) X Error Difference +
Least Error
((22 - 13) / (31 - 13)) X 3 + 2 = 3.5%
Therefore, the error for the 22nd harmonic is ±(3.5% + 2 digits).
Frequency Range, Fundamental: 6-65 Hz and dc
Minimum Input Levels: 5V rms or 1A rms
Volts Measurements (True rms):
Input Range: 5.0V to 600V rms (ac + dc)
5.0V to ±933V peak
Basic Accuracy*:
rms (ac + dc): ±(0.5% + 2 digits); 6-65 Hz
peak, dc: ±(2% + 3 digits)
*
< 15V rms, add 2 digits
Input Impedance: 1 MΩ, balanced
Crest Factor: > 3.0 below 300V, 1.56 @ 600V
Amps Measurements (True rms)
(1 mV/A) Isolated Input

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Input Range: 1.00 mV (A) to 1400 mV rms (A) (ac + dc)
1.0 mV (A) to ±2000 mV (A) peak
Basic Accuracy:
rms (ac + dc): ±(0.5% + 3 digits); 6-65 Hz + probe specs
peak, dc: ±(2% + 4 digits) + probe specs
Input Impedance: 1 MΩ|| 47 pF
Crest Factor: > 3.0 below 600 mV, 2.0 @ 1000 mV
Watts Measurements (Volt-Amps)
(1 mV/A) Isolated Input
Range: 0 W (VA) to 600 kW (kVA) average
0 W (VA) to 2000 kW (kVA) peak
Accuracy (ac + dc)
Active W (VA): ±(1% + 4 digits) + probe specs
Harmonics Measurement Accuracy (Cursor Data)
(Harmonic Level > 5% Using Smooth ~20)
Volts:
Fundamental to 13th Harmonic: ±(2% + 2 digits)
13th to 31st Harmonic: 13th (±(2% + 2 digits)) -----31st (±(8% + 2
digits))
Amps* or Watts:
Fundamental to 13th Harmonic: ±(3% + 3 digits) + probe specs
13th to 31st Harmonic: 13th (±(3% + 3 digits) + probe specs) -----
----- 31st (±(8% + 3 digits)+ probe specs)
* < 20A, add 3 digits
Phase:
Fundamental: (±2 degrees) + probe specs
2nd to 31st Harmonic: 2nd (±5 degrees) ---- 31st (±20 degrees) +probe specs
Frequency Measurement Accuracy (Fundamental, 6.0 Hz - 99.9 Hz)
6.0 Hz - 99.9 Hz: ±0.3 Hz

Introduction and Specifications
Specifications
1
1-7
Other Measurement Specifications
Measurement Function Range/Resolution Accuracy
Input Bandwidth: (-0.5 dB) DC, 6 Hz to 2.1 kHz
Crest Factor (CF): (Using Smooth
%20): 1.00 to 5.00 ±4%
Power Factor (PF): 0.00 to 1.00 ±0.02
Power Factor Displacement (PFD): 0.00 to 0.29
0.30 to 0.69
0.70 to 0.89
0.90 to 1.00
Unspecified
±0.04
±0.03
±0.02
Phase Measurement Range: -179 to 180 degrees (see Phase above)
K-Factor (KF) Range (Model 41B): 1.0 to 30.0 ±10%
Total Harmonic Distortion:
%THD-F:
%THD-R: 0.0 to 799.9 0.0 to 99.9 ±(0.03 ×Reading + 2.0%) ±(0.03 ×Reading + 2.0%)
Ranges and Resolution
AC Volts AC Amps Watts
Range
(PK) Resolution Range (PK) Resolution Range (PK) Resolution
20V 0.1V 2A 0.01A 50W 1.0W
50V 0.1V 5A 0.01A 100W 1.0W
100V 0.1V 10A 0.01A 200W 1.0W
200V 0.1V 20A 0.01A 500W 1.0W
500V 1V 50A 0.1A 1 kW 0.01 kW
1 kV 1V 100A 0.1A 2 kW 0.01 kW
200A 0.1A 5 kW 0.01 kW
500A 1A 10 kW 0.1 kW
1000A 1A 20 kW 0.1 kW
2000A 1A 50 kW 0.1 kW
100 kW 1 kW
200 kW 1 kW
500 kW 1 kW
1 kkW 1 kW
2 kkW 1 kW

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General Specifications
Size: 9.2 x 3.9 x 2.5 inches (234 x 100 x 64 mm)
Weight: 2.0 lbs (1 kg)
Input Connectors:
Voltage: 2 shrouded banana jacks (4 mm)
Current Probe: 1 shrouded BNC jack
Battery:
Type: 4 Alkaline "C" Cells ANSI/NEDA-14A, IEC-LR14 (supplied)
Operating Time: 48 Hours typical (continuous without backlight)
Alternate Battery:
4 NiCad Cells, customer supplied and externally charged. The Tester prevents battery reversal
by turning itself off if battery voltage drops below 4.0V dc.
Temperature:
Operating: 0 to 50°C (32 to 122°F)
Storage: -20 to 60°C (-4 to 140°F)
Temperature Coefficient: 0.1 x Specified Accuracy per °C
(0 to 18°C, 28 to 50°C)
Humidity (noncondensing):
Operating: 0 - 30°C: 90%
30 - 40°C: 75%
40 - 50°C: 45%
Storage: 90%
Altitude:
Operating: 10,000 feet (2 km)
Storage: 40,000 feet (12 km)
Shock & Vibration: per MIL-T-28800, class 3, sinusoidal, non-operating
Electro-Magnetic Compatibilty:
RF Emissions: EN 50081-1 Commercial Limits,
VFG 243-1991
RF Susceptibility: EN 50082-1 Commercial Limits
Council Directive: Electromagnetic Compatibility Directive (89/336/EEC)
Drip Proof and Dust Proof Case: per IEC 529, Section 3; IP 52 Dust-Protected, Drip Proof
Display
Type: Super Twisted Liquid Crystal
Size: 3.0 inch diagonal (76 mm)
Resolution: 160 W x 128 H pixels
Contrast: User adjustable
Backlight: Yellow-green LED

Introduction and Specifications
Specifications
1
1-9
Safety
Designed for 600V measurements on industrial power distribution circuits.
!Overload Protection:
Voltage or Current Probe Input: 600V, maximum
Surge Protection: 6 kV per IEC 1010-1
Maximum Voltage Isolation to Earth: 600V from any terminal
Protection Levels:
IEC 1010-1, Pollution Degree 2, Installation
Category III, Material Group II, 600V
Protection Class:
Protection Class II as described in IEC 1010-1, Annex H (Double or Reinforced
Insulation).
Waveform Memory (Model 41B only)
Eight nonvolatile memories store a maximum of 2048 sampled points of waveform data for
both voltage and current inputs for later recall or sending to a computer.
EIA-232-E (RS-232) Interface (Model 41B only)
Optically-Isolated, 1.2, 9.6, or 19.2 baud rate.
Printer graphical output in either Epson or HP format. Text data is sent in ASCII format
(SEND). Waveform, Data, and Picture formats may be remotely accessed. Remote Trigger
function.

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