Instruction/ maintenance manual of the product 5725A Fluke
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® 5725A Amplifier Instruction Manual PN 823435 January 1989 Rev. 7, 6/02 © 1993, 1996, 2002 Fluke Corporation, Al l rights reserved. Printed i n U.S.
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke produc t is warranted to be free from defec ts in material and work manship under norm al use and servic e. The warranty period is one y ear and begins on the date of shipm ent. Parts, product repairs , and servic es are warranted for 90 days .
i Table of Contents Chapter Titl e Page 1 Introduction and Specifications........................................................ 1-1 1-1. Introduction .......................................................................................... 1-3 1-2.
5725A Instruction M anual ii 3-3. Rear Panel Features .............................................................................. 3-6 3-4. Turning on the 5725A Amplifier.......................................................... 3- 8 3-5. Warm Up ..
Contents (c ontinued) iii 4-43. Window Comparator ................................................................... 4-26 4-44. Input Clam p ................................................................................. 4- 26 4-45. Transconductance and Cascode Stage .
5725A Instruction M anual iv 8 List of Replaceable P arts .................................................................. 8-1 8-1. Introduction .......................................................................................... 8-3 8-2. How to Obtain Parts .
v List of Tables Table Titl e Page 1-1. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Lev els 1-7 1-2. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Lev els 1-8 1-3. DC Voltage Secondary Perform ance Specifications and Operating Characteristics .
5725A Instruction M anual vi 7-2. Analog Monitor Faults ........................................................................................... 7-7 8-1. Manual Status Inform ation ...................................................................
vii List of Figures Figure Titl e Page 1 - 1. Volt - Hertz Capabilit y ........................................................................................... . 1 - 15 2 - 1. Line Power Cords A v ailable for Flu k e I nstru m ent s ...............
5725A Instruction M anual viii.
Interference Information This equipment generates and uses radio frequency ener gy and if not installed and used in strict accordance with the manufacturer’s instr uctions, may cause interference to radio and television reception.
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OPERATOR SAFETY SUMMARY WARNING HIGH VOLTAGE is used in the operation of this equipment LETHAL VOLTAGE may be present on the terminals, observe all safety pr ecautions! To avoid electri cal shock hazard, the operat or should not el ectricall y contact the out put hi or sense hi bi nding posts.
Symbols Marked on Equipment DANGER — High Volt age Protective ground (earth) terminal Attention — refer to the manual. This symbol indicates that information about the usage of a feature is contained in the manua l.
SERVICING SAFETY SUMMA R Y FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the precedin g Operator Safet y Su mm ary Do Not Service Al one Do not perfor m internal ser v ice or ad j ust m ent of this product unless another person capable of renderin g first aid and resuscitation is present.
FIRST AID FOR ELECTRIC SHOCK Free the Victi m Fr om the Li ve Conductor Shut off high voltage at once and ground the circuit. If high voltage cannot be turned off quickly, ground the circuit. If the circuit cannot be broken or grounded, use a board, dry clothing, or other nonconductor to free the victim.
1-1 Chapter 1 Introduction and Specifications Title Page 1-1. Introduction .......................................................................................... 1-3 1-2. Where to Go From Here ......................................................
5725A Instruction M anual 1-2.
Introduction and Specifications Introduction 1 1-3 1-1. Introduction The Fluke 5725A Amplifier enhances the 5700A Calibrator in the ac voltage, ac current, and dc current functions. The 5725A operates under complete control of the 5700A through an interface cable supplied with the 5725A.
5725A Instruction M anual 1-4 1-2. Where to Go From Here This manual is the operator and service manual for the 5725A. How ever, because the 5725A operates under the control of the 5700A Calibrator, most operating instructions for the 5725A are in the 5700A/5720A Series II manuals.
Introduction and Specifications How to Use the Manuals 1 1-5 1-3. How to Use the Manuals The following paragraphs describe how each manual addresses the 5725A. 1-4. 5725A Getting Start ed Manual Use this manual for basic getting started information, contacting Fluke, unpacking, and general specifications.
5725A Instruction M anual 1-6 1-9. 5700A/5720A Series II Remote Programming Reference Guide The 5700A/5720A Series II Remote Programming R eference Guide contains a summary of remote commands for the 5700A. It also contains information needed to determine system status using the status byte and registers.
Introduction and Specifications DC Voltage Specifications 1 1-7 1-12. DC Voltage Specifications Table 1-1. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >1 V/m but ≤ 3 V/m, add 0.
5725A Instruction M anual 1-8 Table 1-2. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >1 V/m but ≤ 3 V/m, add 0.
Introduction and Specifications DC Voltage Specifications 1 1-9 Table 1-3. DC Voltage Secondary Performance Specifications and Operating Characteristics Temperature Coeffici ent Adder [Note 2] Noise Range Stabilit y [Not e 1] ± 1 °C 10 °-40 °C 0 °-10 °C and Linearity ± 1 °C Bandwidt h 0.
5725A Instruction M anual 1-10 1-13. AC Voltage Specifications Table 1-4. 5720A Series II AC Voltage Specifications: 99 % Confidence Level 5720A 99% 99 % Confidence Level Range Resolution Frequency Ab.
Introduction and Specifications AC Voltage Specifications 1 1-11 Table 1-5. 5720A Series II AC Voltage Specifications: 95 % Confidence Level 5720A 95% 95 % Confidence Level Range Resolution Frequency .
5725A Instruction M anual 1-12 Table 1-6. 5700A Series II AC Voltage Specifications: 99 % Confidence Level 5700A 99% 99 % Confidence Level Range Resolution Frequency Absolute Uncertain ty ± 5 °C fro.
Introduction and Specifications AC Voltage Specifications 1 1-13 Table 1-7. 5700A Series II AC Voltage Specifications: 95 % Confidence Level 5700A 95% 95% Confidence Level Range Resolution Frequency A.
5725A Instruction M anual 1-14 Table 1-8. AC Voltage Secondary Performance Specifications and Operating Characteristics Stabilit y ± 1 °C [Note 1] Temperature Coeffici ent Maximum Distortion Range Frequency 24 Hours 10°-40 °C 0°-10 °C and 40°-50 °C Output Impedance Bandwidth 10 Hz-10 MHz Hz ± µ V ±µ V/°C Ω± (% output + µ V) 2.
Introduction and Specifications AC Voltage Specifications 1 1-15 Table 1-8. AC Voltage Secondary Performance and Operating Characteristics (continued) 5725A Amplifier: Stabilit y ± 1 °C [Note 1] Tem.
5725A Instruction M anual 1-16 1-14. Resistance Specifications Table 1-9. 5720A Series II Resistance Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99% Confidence Level Nomi nal Value Absol.
Introduction and Specifications Resistance Specifications 1 1-17 Table 1-10. 5700A Series II Resistance Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Nomi nal Value A.
5725A Instruction M anual 1-18 Table 1-11. Resistance Secondary Performance Specifications and Operating Characteristics Nomi nal Value Stab ility ± 1 °C [Note 1] Temperature Coefficient Adder [Note.
Introduction and Specifications Resistance Specifications 1 1-19 Table 1-12. Current Derating Factors Nominal Value Value of Derating Factor K for Over or Under C urrent Ω Two-Wire Comp I < I L [Note 1] Four-Wire I < I L [Note 1] Four-Wire I U < I < I max [Note 2] SHORT 1 1.
5725A Instruction M anual 1-20 1-15. DC Current Specifications Table 1-13. 5720A Series II DC Current Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calib rati on temperature.
Introduction and Specifications DC Current Specifications 1 1-21 Table 1-14. 5700A Series II DC Current Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.
5725A Instruction M anual 1-22 Table 1-15. DC Current Secondary Performance Specifications and Operating Characteristics Temperature Coefficient [Note 2] Noise Range Sta bility ± 1 °C [Note 1] 10 °-40 °C 0 °-10 °C and Compliance Limits Burden Voltage Adder [Note 3] Maximu m Load for Full Accuracy Bandwidth 0.
Introduction and Specifications AC Current Specifications 1 1-23 1-16. AC Current Specifications Table 1-16. 5720A Series II AC Current Specifications: 99 % Confidence Level 5720A 99% 99 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.
5725A Instruction M anual 1-24 Table 1-17. 5720A Series II AC Current Specifications: 95 % Confidence Level 5720A 95% 95 % Confidence Level Range Resolut ion Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.
Introduction and Specifications AC Current Specifications 1 1-25 Table 1-18. 5700A Series II AC Current Specifications: 99 % Confidence Level 5700A 99% 99 % Confidence Level Range Resolut ion Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.
5725A Instruction M anual 1-26 Table 1-19. 5700A Series II AC Current Specifications: 95 % Confidence Level 5700A 95% 95 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.
Introduction and Specifications AC Current Specifications 1 1-27 Table 1-20. AC Current Secondary Performance Specifications and Operating Characteristics Stabilit y ± 1 °C [Note 1] Temperature Coef.
5725A Instruction M anual 1-28 1-17. Wideband AC Voltage (Option 5700-03) Specifications Table 1-21. Wideband AC Voltage (Option 5700-03) Specifications Specifications apply to the end of the cable an.
Introduction and Specifications General Specifications 1 1-29 1-18. General Specifications Warm-Up Time: Twice the time s ince last w armed up, to a maxim um of 30 minutes . System installation: Rear output configuration and rack - mount kit av ailable.
5725A Instruction M anual 1-30 1-19. Auxiliary A mplifier Specificatio ns For complete specifications, see the 5205A and 5220A Op erators Manuals. 5205A (220V - 1100 V ac, 0 V - 1100 V dc) Overshoot: < 10 % Distortion (bandwidth 10 Hz - 1 MH z): 10 Hz - 20 kH z 20 kHz - 50 k Hz 50 kHz - 100 k Hz 0.
2-1 Chapter 2 Installation Title Page 2-1. Introduction .......................................................................................... 2-3 2-2. Unpacking and I nspection .................................................................... 2-3 2-3.
5725A Instruction M anual 2-2.
Installation Introduction 2 2-3 Warning The 5725A amplifi er i s capable of suppl yi ng l et hal voltages. Do not touch the 5700A out put t ermi nals. Read thi s section before operating the 5725A. 2-1. Introduction This section provides instructions for unpacking and installing the 5725A.
5725A Instruction M anual 2-4 Table 2-2. Line Power Cord Types Available from Fluke TYPE VOLTAGE/CURRENT FLUKE OPTION NUMBER North America 120V/15A LC-1 North America 240V/15A LC-2 Universal Euro 220V.
Installation Service Information 2 2-5 2-3. Service Information Each 5725A Amplifier is warranted to the original purchaser for a period of one year beginning on the date received. The warranty is located at the front of this manual. Factory-authorized service and technical advice for the 5725A is available at Fluke Service Ce nters.
5725A Instruction M anual 2-6 2-6. Connecting to the 5700A Cali br ator Proceed as follows to connect the 5725A to the 5700A: 1. Turn the power off for both instruments and disconnect their line power cords. 2. Connect either end of the interface cable to the 5725A connector labeled 5700A.
Installation Selecting Line Voltage 2 2-7 2-7. Selecting Line Voltage The 5725A arrives from the factory configured for the line voltage normally appropriate for the country of purchase, or as specified at the time of purchase. Check the line power label on the rear panel of the 5725A to verify that the line voltage matches local line power.
5725A Instruction M anual 2-8 2-8. Accessing the Fuse Caution To prevent instrument damage, verify that t he correct fuse is install ed f or the line vol tage setti ng. Acceptable f use types are Bussman type MTH or Lit t el fuse type 312 or equival ent, of t he appropriate amperage rati ng.
Installation Connecting to Line Power 2 2-9 2-9. Connecting to Line Power Warning To avoid shock hazard, connect t he f act ory-supplied, three- conductor line pow er cord t o a properl y grounded pow er out l et . Do not use a two-conductor adapter or extension cord; this will break the protecti ve ground connect i on.
5725A Instruction M anual 2-10.
3-1 Chapter 3 Operating Notes Title Page 3-1. Introduction .......................................................................................... 3-3 3-2. Front Panel Features .......................................................................
5725A Instruction M anual 3-2.
Operating Notes Introduction 3 3-3 3-1. Introduction This section provides setup and operation information for the 5725A Amplifier. This section begins with a reference for the 5725A front and rear panel features. Information about setting up and powering up the 5725A follows.
5725A Instruction M anual 3-4 3-2. Front Panel Features Front panel features are called out in Figure 3-1. Each front panel feature is described in Table 3-1. CURRENT OUTPUT HI LO VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT OVERLOAD CABLE OFF POWER 1 2 3 4 5 6 7 8 11A MAX 2OV PK MAX aq6f.
Operating Notes Rear Panel Features 3 3-5 Table 3-1. Front Panel Features A CURRENT OUTPUT Binding Posts The source of all am plified current if the 5725A is c onfigured for front output. You can set the 5700A to source all unam plified as well as amplified current through thes e binding posts.
5725A Instruction M anual 3-6 3-3. Rear Panel Features Rear panel features are called out in Figure 3-2. Each rear panel feature is briefly described in Table 3-2. 1 2 3 4 5 6 7 8 100V 110V 115V 120V S2 S3 S4 VOLTAGE SELECTION FUSE F8A 250V (FAST) 200V 220V 230V 240V S2 S3 S4 F4A 250V (FAST) JOHN FLUKE MFG.
Operating Notes Turning on the 5725A Amplifier 3 3-7 Table 3-2. Rear Panel Features A CURRENT OUTPUT Binding Posts The source of all am plified current if the 5725A is c onfigured for rear output. You can set the 5700A to source all its unamplified as w ell as amplified c urrent through these binding posts .
5725A Instruction M anual 3-8 3-4. Turning on the 5725A Amplifier Warning To avoid electri c shock, make sure the 5725A is safel y grounded as described in secti on 2. Caution Before turning t he 5725A on, make sure t hat the li ne voltage selection sw i tches are set properly f or your line vol t age.
Operating Notes 5725A Operating Functions and Modes 3 3-9 3-6. 5725A Operating Functi ons and Modes Warning Both the 5700A and 5725A can produce fat al vol tages. boosted voltage operati on produces hi gh voltage at hi gher current levels than normal l y availabl e f r om t he 5700A.
5725A Instruction M anual 3-10 3-8. Voltage Standby NO OUTPUT CURRENT OUTPUT HI LO VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT OVERLOAD CABLE OFF 11A MAX 2OV PK MAX NO OUTPUT HI HI LO LO AUX CURRENT GUARD GROUND WIDEBAND SENSE V A Ω OUTPUT V A Ω µ • HI BOOST LIT aq9i.
Operating Notes 5725A Operating Functions and Modes 3 3-11 3-9. Current Standby CURRENT OUTPUT HI LO VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT OVERLOAD CABLE OFF 11A MAX 2OV PK MAX NO OUTPUT HI HI LO LO AUX CURRENT GUARD GROUND WIDEBAND SENSE V A Ω OUTPUT V A Ω µ • NO OUTPUT HI BOOST LIT aq10i.
5725A Instruction M anual 3-12 3-10. Voltage Operate CURRENT OUTPUT HI LO VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT OVERLOAD CABLE OFF 11A MAX 2OV PK MAX NO OUTPUT HI HI LO LO AUX CURRENT GUARD GROUND WIDEBAND SENSE V A Ω OUTPUT V A Ω µ • VOLTAGE OUTPUT HERE HI BOOST LIT aq11i.
Operating Notes Conditions That Activate the 5725A 3 3-13 3-11. Current Operate CURRENT OUTPUT HI LO VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT OVERLOAD CABLE OFF 11A MAX 2OV PK MAX CURRENT OUTPUT HERE HI HI LO LO AUX CURRENT GUARD GROUND WIDEBAND SENSE V A Ω OUTPUT V A Ω µ • NO OUTPUT HI BOOST LIT aq12i.
5725A Instruction M anual 3-14 3-12. Conditions That Acti vate the 5725A When the 5725A is connected to the 5700A, and is selected as the amplifier for the active output function, it supplies an output under the conditions shown in the following list.
4-1 Chapter 4 Theory of Operation Title Page 4-1. Introduction .......................................................................................... 4-3 4-2. Overall Functional D escription ........................................................
5725A Instruction M anual 4-2 4-30. Optoisolator Link ......................................................................... 4-18 4-31. Break- Detect Circuitry................................................................. 4- 19 4-32. Power Up and Reset Circuitry .
Theory of Operation Introduction 4 4-3 4-1. Introduction This section presents theory of operation in increasing level of detail. The 5725A Amplifier is first broadly defined in an overall functional description and block diagram.
5725A Instruction Manual 4-4 Figure 4-1. 5725A Overall Block Diagram.
Theory of Operation Overall Functional Description 4 4-5 • 11A DC Function: The 11A dc function is implemented with a transconductance (voltage in/current out) amplifier with a gain of -5. If the 5700A outputs -2V into the 5725A, the 5725A output is 10A.
5725A Instruction M anual 4-6 The 5700A/5725A system uses the following method for ac amplitude control: 1. An rms thermal sensor alternately measures two signals: an unknow n but adjustable ac signal, and a known calibrated dc signal.
Theory of Operation Overall Functional Description 4 4-7 4-5. Operation i n the 11A DC Range For the dc current function, the 5700A is configured for the dc 2.2V range. The 5700A 2V dc range drives an error amplifier with an input impedance of 40 k Ω .
5725A Instruction M anual 4-8 4-10. How the 5700A and 5725A Communicat e The 5725A and 5700A maintain all analog and digital communication over an external cable connected to subminiature D-type connectors on the back of each instrument.
Theory of Operation Overall Functional Description 4 4-9 4-12. Description of the In- Guard Lines The following list describes the 11 5725A in-guard lines: • B-RCL High-quality analog line from the 5725A which carries critical signals to be measured by the 5700A adc during either 5725A calibration or 5725A self diagnostics.
5725A Instruction M anual 4-10 Inside the 5725A, B-SENSE LO is buffered by the 5725A, with the equivalent voltage called MCOM. • B-FEEDBACK During ac voltage operati on, B-FEEDBACK is the output of the High Voltage Sense assembly; this signal represents B-SENSE HI divided by -100, and drives the 5700A ac/dc thermal sensor.
Theory of Operation Detailed Circuit Description 4 4-11 • High Voltage Pow er Amplifier Assembly (A3) • Power am plifier • Harness to heat sink and its high v oltage pow er devices • Connectio.
5725A Instruction M anual 4-12 4-16. Power Supply Assembly (A4) The Power Supply assembly (A4) provides regulated system supplies for all 5725A assemblies except as noted below, as well as unregulated fan supply and high voltage supplies for the High Voltage Amplifier.
Theory of Operation Detailed Circuit Description 4 4-13 4-17. High Voltage Suppl y Section The high voltage supply allows normal operation from a pair of nominal 400V dc supplies, or troubleshooting operation in a reduced voltage mode with a pair of nominal 50V dc supplies.
5725A Instruction M anual 4-14 4-18. Switchi ng Section MOSFETs Q301/Q317 and Q302/Q318 (each in parallel) are series-switch elements for the +400V supply.
Theory of Operation Detailed Circuit Description 4 4-15 4-19. Curr ent-Limi t Section Resistors R313 and R329 are current shunts for the high voltage supplies. These are connected in series with the bridge rectifiers, with the common point between the shunts being the high voltage supply common, HVCOM.
5725A Instruction M anual 4-16 4-21. Fan Supply Section The fan supply uses the same transformer secondary windings as the ± 15 and ± 20V supplies. Its own full-wave bridge rectifier diodes create a supply voltage of +25V. Transistor Q351 is operated near saturation, and provides the measurement point to tell the CPU w hether the fan is running.
Theory of Operation Detailed Circuit Description 4 4-17 aq19f.eps Figure 4-2. Digital Assembly Block Diagram.
5725A Instruction M anual 4-18 4-26. EEROM A 2Kb X 8 EEROM (U512) stores 5725A calibration constants plus the date and temperature of calibration. If the rear panel CALIBRATION switch is in the NORMAL position, the EEROM is software write disabled.
Theory of Operation Detailed Circuit Description 4 4-19 4-31. Break-Detect C ircuitr y The 6303Y divides the 4.9152-MHz crystal frequency by four to create the 1.2288-MHz ECLK. This signal serves as the clock for the 74HC4020 counter (U506), which is configured as a divide-by-16384.
5725A Instruction M anual 4-20 aq20f.eps Figure 4-3. Current Amplifier Assembly Block Diagram.
Theory of Operation Detailed Circuit Description 4 4-21 • Error Amplifier Section The error amplifier section contains three differential amplifiers and a precision high-current shunt resistor. Two differential amplifiers set the gain and uncorrected frequency response of the current amplifier.
5725A Instruction M anual 4-22 (ICAL, TP208) with the same amplitude and polarity as the current amplifier input voltage. The calibration amplifier output is measured by circuitry within the 5700A during calibration of the 5725A current amplifier. The calibration amplifier output is fed back to the 5700A Oscillator during ac current operation.
Theory of Operation Detailed Circuit Description 4 4-23 4-38. Control and Swi tching Section Refer to page 2 of the Current Amplifier schematic. Relays K201 through 209, Q214 through 216, and U209 through 210 configure the Current Amplifier circuitry for the following six modes: • Current Standby Current Amplifier input is active through K201.
5725A Instruction M anual 4-24 4-40. High Voltage Amplifier ( A3) The High Voltage Amplifier assembly, operating w ith the step-up signal transformers, constitutes an amplifier with an inverting gain of 100.
Theory of Operation Detailed Circuit Description 4 4-25 aq22f.eps Figure 4-4. High Voltage Amplifier Assembly Block Diagram.
5725A Instruction M anual 4-26 4-42. Integrator Op amp U601A is configured as an integrator to reduce the output offset of the input amplifi er circuit . This integrat or senses the output vol tage of the ampl ifier ( MVOUT) through R604 and R605 and forces it to be zero with respect to HVC OMM.
Theory of Operation Detailed Circuit Description 4 4-27 4-45. Transconductance and Cascode Stage The output voltage of the input amplifier U602, LVAMP, is transformed into a current by Q602. The nominal current is about 8.5 mA. This implies that the nominal output voltage of the input amplifier is about 6V; 15V - (.
5725A Instruction M anual 4-28 compensate for the capacitance seen at the gates of the power MOSFETs on the #1 heat sink assemblies. Their sources establish the voltage on the gates of the cascode FETs in the midstage, Q654 and Q662.
Theory of Operation Detailed Circuit Description 4 4-29 Op amp U606B senses the -400V supply and forces the autobias to the minimum bias condition when the ± 400V supplies are turned off. Transistor Q606 forces the minimum bias condition when the window comparator is activated.
5725A Instruction M anual 4-30 to approximately 33 Ω / ° C by R615. Op amp U603A provides a reference voltage of about -0.77V. This reference voltage is applied to the circuit containing summing amplifier U603B, R611, and the linearized thermistor.
Theory of Operation Detailed Circuit Description 4 4-31 aq21f.eps Figure 4-5. High Voltage Sense Assembly Block Diagram.
5725A Instruction M anual 4-32 • Serial Interface/Guard Crossing Section The serial interface/guard crossing section consists of an RS-232 interface integrated circuit that provides the hardware for 5700A/5725A communication within the 5725A.
Theory of Operation Detailed Circuit Description 4 4-33 VR105 reduce apparent supply voltage seen by U102. Transistors Q 105 and Q106 along with R131/C117 and R 132/C118 filter the supply to reduce common mode errors at high frequency. Capacitor C108 provides ac tuning for the sense amplifier.
5725A Instruction M anual 4-34 latch up by eliminating positive feedback resulting from positive output voltages from U100. Op amp U 105 is simply a low-noise inverting amplifier that scales the sensor output to 10 dB below the 5700A O scillator output level.
Theory of Operation Detailed Circuit Description 4 4-35 IC U156 is a dac whose digital input is under microprocessor control via data latch U155. The +15V supply is the dac’ s reference voltage. Op amp U153A acts as a current- to-voltage converter, providing outputs between 0V and -6.
5725A Instruction M anual 4-36 Relays K102 and K103 provide switching that allows direct drive of the sense amplifier and its calibration circuitry by the 5700A.
Theory of Operation Detailed Circuit Description 4 4-37 4-60. AC Line Voltage Sel ection Section In addition to the primary power switch, S401, this section contains three line-voltage selection switches, S402 through S404. These three switches allow the 5725A to be set to eight nominal ac line voltage levels, each with a 10% tolerance.
5725A Instruction M anual 4-38.
5-1 Chapter 5 Calibration and Verification Title Page 5-1. Introduction ............................................................................................ 5-3 5-2. Where to Find Further Information ...........................................
5725A Instruction M anual 5-2.
Calibration and Verification Introduction 5 5-3 5-1. Introduction The 5725A is calibrated at the factory before shipping. Calibration is traceable to the U.
5725A Instruction M anual 5-4.
Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices by: 1. Knowing that there is a problem. 2. Leaning the guidelines for handling them.
5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT. 6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE. 7. AVOID PLASTIC,VINYL AND STYROFOAM IN WORK AREA. 8. WHEN REMOVING PLUG-IN ASSEMBLIES HANDLE ONLY BY NON-CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION.
6-1 Chapter 6 Maintenance Title Page 6-1. Introduction .......................................................................................... 6-3 6-2. Replacing the Fuse .............................................................................
5725A Instruction M anual 6-2.
Maintenance Introduction 6 6-3 Warning Servicing described i n this secti on is to be done by quali fied service personnel only. To avoid electri cal shock, do not service the 5725A unless you are qual i fied to do so.
5725A Instruction M anual 6-4 100V 110V 115V 120V S2 S3 S4 VOLTAGE SELECTION FUSE F8A 250V (FAST) 200V 220V 230V 240V S2 S3 S4 F4A 250V (FAST) JOHN FLUKE MFG.
Maintenance General Cleaning 6 6-5 aq14f.eps Figure 6-2. Accessing the Air Filter 6-4. General Cleaning To keep the 5725A looking like new, clean the case, front panel, and rear panel using a soft cloth slightly dampened with water or a non-abrasive mild cleaning solution that does not harm plastics.
5725A Instruction M anual 6-6 6-6. Access Procedures Figure 6-3 shows the location of all major modules in the 5725A. View A is a top view, and view B is a bottom view. Both views show the covers removed. The 5725A is constructed so that two modules are completely accessible from the top, and two modules are completely accessible from the bottom.
Maintenance Access Procedures 6 6-7 Warning Follow t he i nstructions under " Initi al Access Procedure" to make sure high voltage has been bl ed of f before you touch anything insi de t he 5725A.
5725A Instruction M anual 6-8 CURRENT MODE 5725A STANDBY FAULT OVERLOAD CABLE OFF POWER 11A MAX 2OV PK MAX LED CR317 TP301 FRONT PANEL TP307 TP304 LED CR318 HIGH VOLTAGE AMPLIFIER (A3) POWER SUPPLY (A4) aq16f.eps Figure 6-4. Initial Access Procedure 6.
Maintenance Access Procedures 6 6-9 8. Take another DMM reading with the common lead to TP307 and the high lead to TP304 on the Power Supply assembly. This is the -400V filter capacitor test point, and it should be at a safe level near zero. This completes the initial access procedure.
5725A Instruction M anual 6-10 CAUTION WHEN REINSTALLING DIGITAL ASSEMBLY, PULL RIBBON CABLE SLACK COMPLETELY INTO CHASSIS. aq17f.eps Figure 6-5. Accessing the Digital Assembly.
Maintenance Access Procedures 6 6-11 4. If you want to completely remove the Digital assembly, remove the ribbon cable by releasing the catches on the board-mounted connector. Caution When replacing the Di gital assembl y, make sure the ribbon cable is pull ed fully i nto the 5725A chassis.
5725A Instruction M anual 6-12 CURRENT AMPLIFIER (A2) BRIDGE RECTIFIER HEAT SINK DRESS CABLES AS SHOWN aq18f.eps Figure 6-6. Correct Way to Dress Cables 6-11. Accessing the High Voltage A mplifier (A3) The High Voltage Amplifier assembly lays flat on the top of the instrument, tow ard the front.
Maintenance Access Procedures 6 6-13 6-12. Accessing the High Voltage Sense A ssembly (A6) Warning To avoid electri cal shock, do not proceed w i t h t he f ollow i ng access procedure until you have compl et ed the init ial access procedure, which removes l i ne pow er and checks f or hi gh voltage on the pow er suppl y.
5725A Instruction M anual 6-14 6-13. Accessing the High Voltage Out put Transistors Warning During normal operati on, the high vol t age heat si nks are at lethal vol t age.
Maintenance Enabling Front or Rear Binding Posts 6 6-15 6. Turn over the 5725A so that the top is facing up. 7. Remove the high voltage heat sink assembly as described under “Accessing the High Voltage Output Transistors", steps 2 through 4. 8.
5725A Instruction M anual 6-16 J222 FRONT OUTPUT CABLE REAR OUTPUT CABLE CURRENT AMPLIFIER (A2) SECURE UNUSED CABLE aq23f.eps Figure 6-7. Enabling Front or Rear Binding Posts Caution Make sure that t he unused connect or i s neatly secured i n t he recessed area of the chassis si de, away from t he Hi gh Voltage Sense assembly as Figure 6-7 show s.
7-1 Chapter 7 Troubleshooting Title Page 7-1. Introduction .......................................................................................... 7-3 7-2. 5725A Fault Codes ..........................................................................
5725A Instruction M anual 7-2.
Troubleshooting Introduction 7 7-3 7-1. Introduction This section provides troubleshooting information in three parts. First a listing of all 5725A fault codes is provided for reference in Table 7-1. Following that is a description of 5725A automated self-diagnostics that you run from the 5700A.
5725A Instruction M anual 7-4 Table 7-1. 5725A Fault Codes FAULT NO. MESSAGE EXPLANATION 201 5725 Self-Test ROM Failure Requires service 202 5725 Self-Test RAM Failure Requires serv ice 203 5725 Self-.
Troubleshooting Self Diagnostics 7 7-5 Table 7-1. 5725A Fault Codes (cont) FAULT NO. MESSAGE EXPLANATION 228 5725 Software TRAP 229 5725 Cable Was Off 230 5725 RESET (power-up or watchdog time.
5725A Instruction M anual 7-6 7-4. Manual Tests for Fault Isolation Warning The follow i ng servicing i s t o be done by qual i fied servi ce personnel only. To avoi d electrical shock, do not servi ce t he 5725A unless you are qualif i ed to do so. Follow t he access procedures and w arnings in sect i on 6 t o open the 5725A covers.
Troubleshooting Manual Tests for Fault Isolation 7 7-7 7-5. Problems 1 or 2: Fault at Power-U p or When Entering Volt age Standby Proceed as follows to isolate the problem in these conditions: 1. If the 5700A is reporting a fault, determine if it is an analog monitor fault from Table 7-2.
5725A Instruction M anual 7-8 7-6. Problem 3: Fault When Ent ering Voltage Operate Proceed as follows to isolate the problem in this condition: 1. Suspect the 5700A/5725A interface cable. 2. Check the analog monitor circuit on the High Voltage Sense A ssembly as in step 1 on conditions 1 and 2.
Troubleshooting Testing the Power Supply By Itself 7 7-9 3. Remove plug P301 from J301 and inserting it into J303. Now the high voltage power supply will power up in the ± 50V mode. The high voltage amplifier may also be serviced in the ± 50V mode. 7-10.
5725A Instruction M anual 7-10.
8-1 Chapter 8 List of Replaceable Parts Title Page 8-1. Introducti on .......................................................................................... 8-3 8-2. How to Obtain Par ts ............................................................
5725A Instruction M anua l 8-2.
List of Replaceable Parts Introduct ion 8 8-3 8-1 . Introduc tion This chap ter con tains an illust rated lis t of rep laceable pa rts for the 7-300, 7-60 0, 12B, and 18 Meters. Pa rts a re listed by asse mbly; alph abetiz ed by re ference designato r.
5725A Instruction M anua l 8-4 Note This instrumen t may contain a Nickel-Cadmi um battery. Do no t mix with the sold wa ste st ream. S pent batte ries sho uld be d isposed o f by a qua lifi ed recycler or hazardous m ateria ls handler. Con tact yo ur author ized Fluke service cen ter for recyc ling in form a tio n.
List of Replaceable Parts Parts Li sts 8 8-5 Table 8-2. Final A ssemb ly (cont) Reference Designator Description Fluke Stock No Tot Qty Notes H437 SCREW ,PH,P,LOC K,SS,6 -32,.750 376822 2 H439 SCRE W,TH,P, LOCK,S TL,8-32 ,.250 853622 4 H443 SCREW ,PH,P,LOC K,STL,6 -32,.
5725A Instruction M anua l 8-6 Table 8-2. Final A ssemb ly (cont) Reference Designator Description Fluke Stock No Tot Qty Notes TM1 572 5 INSTRU CTIO N MANU AL 823435 1 W1 COR D,LINE,5 -15/IEC ,3-18A .
List of Replaceable Parts Parts Li sts 8 8-7 aq24 f.tif Figure 8-1. Fin al Assembly.
5725A Instruction M anua l 8-8 aq25 f.tif Figure 8-1. Fin al Assembly (con t).
List of Replaceable Parts Parts Li sts 8 8-9 aq26 f.tif Figure 8-1. Fin al Assembly (con t).
5725A Instruction M anua l 8-10 aq27 f.tif Figure 8-1. Fin al Assembly (con t).
List of Replaceable Parts Parts Li sts 8 8-11 aq28 f.tif Figure 8-1. Fin al Assembly (con t).
5725A Instruction M anua l 8-12 aq29 f.tif Figure 8-1. Fin al Assembly (con t).
List of Replaceable Parts Parts Li sts 8 8-13 aq30 f.tif Figure 8-1. Fin al Assembly (con t).
5725A Instruction M anua l 8-14 aq31 f.tif Figure 8-1. Fin al Assembly (con t).
List of Replaceable Parts Parts Li sts 8 8-15 Table 8-3. A1 Interco nnect PCA Reference Designator Description Fluke Stock No Tot Qty Notes CR1,CR 13-15 * D IODE,SI,BV= 75V,I O=150 MA,500MW 203323 4 H13 RIVET,S- TUB,OVAL,AL ,.087, .343 838458 8 H22 RIVET,S- TUB,OV AL,STL,.
5725A Instruction M anua l 8-16 5725A-1611 aq36f.eps Figure 8-2. A1 I nterconnect PCA.
List of Replaceable Parts Parts Li sts 8 8-17 Table 8-4. A2 Current Amplifi er PCA Reference Designator Description Fluke Stock No Tot Qty Notes C201,C2 02,C20 7, C208,C2 11,C21 2, C226,C2 27,C23 6 CAP,AL,2 2UF,+ -20%,3 5V 817056 817056 817056 9 C203,C2 04,C21 6, C217,C2 38-240 CAP,POLYES,0.
5725A Instruction M anua l 8-18 Table 8-4. A2 Current Amplifi er PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes MP2 INSULATOR, CURRENT 850151 1 MP28 INSULATOR, CURRENT 85 015.
List of Replaceable Parts Parts Li sts 8 8-19 Table 8-4. A2 Current Amplifi er PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R233,R2 37,R23 8, R273 RES,MF ,2K,+-1% ,0.1 25W,10 0PPM 23522 6 235226 4 R243,R2 44 RES,C F,100K ,+-5%,0.
5725A Instruction M anua l 8-20 5725A-1650 aq37f.eps Figure 8-3. A2 Current A mplifier PCA.
List of Replaceable Parts Parts Li sts 8 8-21 Table 8-5. A3 High Volt age Amplifier PCA Reference Designator Description Fluke Stock No Tot Qty Notes C601 CAP,PO LYES,1UF,+-10%, 50V 733089 1 C602 CAP,C ER,100P F,+- 5%,50V,C 0G 831495 1 C603,C6 06,C60 9- 611,C6 20 CAP,AL,1 0UF,+- 20%,63V ,SOLV P RO 81684 3 816843 6 C604,C6 05 CAP,C ER,1.
5725A Instruction M anua l 8-22 Table 8-5. A3 High Volt age Amplifier PCA (c ont) Reference Designator Description Fluke Stock No Tot Qty Notes Q601 * TRANSISTOR,SI,N-JFET,TO-92 816314 1 Q602,Q60 3,Q60 6 * TRANSISTOR,SI ,PNP,4 0V,0.
List of Replaceable Parts Parts Li sts 8 8-23 Table 8-5. A3 High Volt age Amplifier PCA (c ont) Reference Designator Description Fluke Stock No Tot Qty Notes R640,R6 42 RES,C F,100K ,+-5%,0. 25W 348920 2 R641,R6 48 RES,MF ,10K,+ -1%,0. 125W,1 00PP M 168260 2 R643 RES,CF, 4.
5725A Instruction M anua l 8-24 5725A-1661 aq38f.eps Figure 8-4. A3 Hig h Voltage Amplifier PCA.
List of Replaceable Parts Parts Li sts 8 8-25 Table 8-6. A4 P ower Supply PCA Reference Designator Description Fluke Stock No Tot Qty Notes C301,C3 02,C32 1, C322 CAP,AL,2 20UF,+ -20%, 350V 854 075 854075 4 C303,C3 04,C30 8, C317-3 19,C35 2, C355,C3 58,C36 0, C362 CAP,POLYES,0.
5725A Instruction M anua l 8-26 Table 8-6. A4 P ower Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes MP310 AIDE,P CB PULL 541730 2 MP350 HEAT DIS ,VER T,1.1 3X1.90X0 .95,T 830844 3 MP398 PAD, ADHESIVE 735365 2 P301 JUMPER,RE C,2 POS, .
List of Replaceable Parts Parts Li sts 8 8-27 Table 8-6. A4 P ower Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R351 RES,C F,1K,+- 5%,0. 25W 343 426 1 R355 RES,C F,4.7K,+ -5%, 0.25W 348821 1 R361,R3 62 RES,C F,4.7,+-5% ,0.
5725A Instruction M anua l 8-28 5725A-1631 aq39f.eps Figure 8-5. A4 Power Su pply PCA.
List of Replaceable Parts Parts Li sts 8 8-29 Table 8-7. A5 Digital PCA Reference Designator Description Fluke Stock No Tot Qty Notes C501,C5 03-51 1, C516,C5 18,C51 9, C521 CAP,POLYES,0.1UF,+-10 %,50V 649913 649913 649913 14 C502,C5 20 CAP,AL,2 2UF,+- 20%,35V 81705 6 2 C512,C5 13 CAP,C ER,15P F,+-2 0%,50V ,C0G 69752 4 2 C514,C517 CAP,POL YES,0.
5725A Instruction M anua l 8-30 5725A-1650 aq40f.eps Figure 8-6. A5 Dig ital PCA.
List of Replaceable Parts Parts Li sts 8 8-31 Table 8-8. A6 High Volt age Sense PCA Reference Designator Description Fluke Stock No Tot Qty Notes C98,C99 C AP,CER ,470PF ,+-10%, 50V,C 0G 733071 2 C100.
5725A Instruction M anua l 8-32 Table 8-8. A6 High Volt age Sense PCA ( cont) Reference Designator Description Fluke Stock No Tot Qty Notes J403 HEA DER,1 ROW ,.
List of Replaceable Parts Parts Li sts 8 8-33 Table 8-8. A6 High Volt age Sense PCA ( cont) Reference Designator Description Fluke Stock No Tot Qty Notes R154 RES,MF ,20K,+ -0.1%, 0.25W, 25PPM 810564 1 R155 RES,MF ,13.7K,+ -0.1% ,0.12 5W,25P 851 340 1 R156,R1 58,R16 8, R173 RES,CF, 3.
5725A Instruction M anua l 8-34 5725A-1601 aq41f.eps Figure 8-7. A6 Hig h Voltage Sense PCA.
List of Replaceable Parts Parts Li sts 8 8-35 Table 8-9. A12 Trans former Enclosure Assembly Reference Designator Description Fluke Stock No Tot Qty Notes H1 SCREW,FHU, P,LO CK,SS, 6-32,.2 50 320093 4 H5 S CREW,PH,P,L OCK,MAG S S,6-32,. 2 772 236 20 H39 SCREW ,PH,P,L OCK,STL,6 -32,.
5725A Instruction M anua l 8-36 aq32 f.tif Figure 8-8. A12 Transformer Encl osure Assembly.
List of Replaceable Parts Parts Li sts 8 8-37 aq33 f.tif Figure 8-8. A12 Transformer Encl osure Assembly (c ont).
5725A Instruction M anua l 8-38 aq34 f.tif Figure 8-8. A12 Transformer Encl osure Assembly (c ont).
List of Replaceable Parts Parts Li sts 8 8-39 aq35 f.tif Figure 8-8. A12 Transformer Encl osure Assembly (c ont).
5725A Instruction M anua l 8-40 Table 8-10. A 30 Inductor PCA Reference Designator Description Fluke Stock No Tot Qty Notes J1 CONN,MATE-N-LOK,HEADER,4 PIN 512269 1 L1,L2 CHOKE 490888 2 W1 HARNESS, LINE VOLTAGE 843011 1 1. For sch ematic, See A6 s ection 9.
9-1 Chapter 9 Schematic Diagrams Figure No. Title Page 9-1. A1 Interconnect PCA ........................................................................ 9-3 9-2. A2 Current Amplifier PCA ............................................................... 9- 6 9-3.
5725A Instruction M anual 9-2.
Schematic Diagrams 9-3 9 Figure 9-1. A1 Interconnect PCA 5725A-161 1 aq48f.eps.
5725A Instruction Manual 9-4 Figure 9-1. A1 Interconnect PCA (cont).
Schematic Diagrams 9-5 9 Figure 9-1. A1 Interconnect PCA (cont).
5725A Instruction Manual 9-6 Figure 9-2. A2 Current Amplifier PCA 5725A-1650 aq52f.eps.
Schematic Diagrams 9-7 9 Figure 9-2. A2 Current Amplifier PCA (cont).
5725A Instruction Manual 9-8 Figure 9-2. A2 Current Amplifier PCA (cont).
Schematic Diagrams 9-9 9 Figure 9-2. A2 Current Amplifier PCA (cont).
5725A Instruction Manual 9-10 Figure 9-3. A3 High V oltage Amplifier PCA 5725A-1661 aq56f.eps.
Schematic Diagrams 9-11 9 Figure 9-3. A3 High V oltage Amplifier PCA (cont).
5725A Instruction Manual 9-12 Figure 9-3. A3 High V oltage Amplifier PCA (cont).
Schematic Diagrams 9-13 9 Figure 9-4. A4 Power Supply PCA 5725A-1631 aq59f.eps.
5725A Instruction Manual 9-14 Figure 9-4. A4 Power Supply PCA (cont).
Schematic Diagrams 9-15 9 Figure 9-4. A4 Power Supply PCA (cont).
5725A Instruction Manual 9-16 Figure 9-5. A5 Digital PCA aq62f.eps 5725A-1650 aq43f.eps 100 90 10 0 2 V 10 ms TYPICAL COMMUNICATIONS ACTIVITY AT PINS 12 AND 13 OF U507.
Schematic Diagrams 9-17 9 Figure 9-5. A5 Digital PCA (cont).
5725A Instruction Manual 9-18 Figure 9-6. A6 High V oltage Sense PCA 100 90 10 0 1 V 10 ms 100 90 10 0 1 V 10 ms VOLTAGE STANDBY STANDBY 100 90 10 0 1 V 10 ms CURRENT STANDBY A aq44f.
Schematic Diagrams 9-19 9 Figure 9-6. A6 High V oltage Sense PCA (cont).
5725A Instruction Manual 9-20 Figure 9-6. A6 High V oltage Sense PCA (cont).
Schematic Diagrams 9-21 9 Figure 9-6. A6 High V oltage Sense PCA (cont).
5725A Instruction Manual 9-22 Figure 9-6. A6 High V oltage Sense PCA (cont).
Schematic Diagrams 9 9-23 aq45f.eps Figure 9-7. A12 Transformer Enclosure Assembly.
5725A Instruction M anual 9- 2 4.
1 Index —5— 5700A CAL IBRA TOR connect or, 2-6, 3- 7 Connecting to , 2-6 5725A STANDBY i ndicator, 3- 5 —A— A1. See Interconnect assem bly A2. See Current Amplifier assem bly A3. See High Voltage Amplifier assem bly A4. See Power S upply ass em bly A5.
5725A Instruction M anual 2 PCA s, 6- 5 Clearance requ iremen ts, 2-5 Com m un ication , 5700A an d 5725A, 4- 8 C o nn ec t or s , (a l s o s ee b i n d i ng po s t s , Terminals), 3 - 5 5700A CA L IBRA TOR, 2-6, 3- 7 Lin e pow er, 3-7 Controls.
Index (c ontinued) 3 POWE R switch, 3-5 Problem s, 2- 5, 7-3 —R— Rack mounting, 2 -5 Rear panel featu res, 3-6 Remote control, 3-3 Replacing th e fuse, 6- 3 —S— Selecting line voltage, 2-7 Sel.
5725A Instruction M anual 4.
An important point after buying a device Fluke 5725A (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Fluke 5725A yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Fluke 5725A - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Fluke 5725A you will learn all the available features of the product, as well as information on its operation. The information that you get Fluke 5725A will certainly help you make a decision on the purchase.
If you already are a holder of Fluke 5725A, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Fluke 5725A.
However, one of the most important roles played by the user manual is to help in solving problems with Fluke 5725A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Fluke 5725A along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
