Page 3 - Table of Contents; Chapter
i Table of Contents Chapter Title Page 1 Introduction and Specifications........................................................ 1-1 1-1. Introduction .......................................................................................... 1-3 1-2. Where to Go From Here ..............................
Page 5 - Contents
Contents (continued) iii 4-43. Window Comparator ................................................................... 4-26 4-44. Input Clamp ................................................................................. 4-26 4-45. Transconductance and Cascode Stage ...................................
Page 7 - List of Tables; Table; AC Voltage Secondary Performance Specifications and Operating
v List of Tables Table Title Page 1-1. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 1-7 1-2. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 1-8 1-3. DC Voltage Secondary Performance Specifications and Operating Characteristics ..................
Page 9 - List of Figures; Figure Title Page
vii List of Figures Figure Title Page 1-1. Volt-Hertz Capability ............................................................................................ 1-152-1. Line Power Cords Available for Fluke Instruments .............................................. 2-42-2. Correct Way to Dress Interfac...
Page 13 - WARNING; LETHAL VOLTAGE; Terms in this Manual
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 precautions! To avoid electrical shock hazard, the operator should not electricallycontact the output hi or sense hi binding posts. During operat...
Page 15 - FOR QUALIFIED SERVICE; Also refer to the preceding Operator Safety Summary; Do Not Service Alone; High voltage may still be present even after disconnecting power.
SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the preceding Operator Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this product unless another personcapable of rendering first aid and resuscitation is present. Use Care When Servici...
Page 17 - Chapter 1; Introduction and Specifications; Title
1-1 Chapter 1 Introduction and Specifications Title Page 1-1. Introduction .......................................................................................... 1-3 1-2. Where to Go From Here ....................................................................... 1-4 1-3. How to Use the Manuals...
Page 19 - Introduction; Capacitive load limits are increased to 1000 pF.
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 5700Athrough an interface cable supplied with the 5725A. A diagram in ...
Page 21 - How to Use the Manuals; 725A Getting Started Manual; Cable connections to a UUT for amplified voltage and current
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 Started Manual Use this manual for basic getting started information, contacting Fluke, unpacking, andgeneral specificati...
Page 22 - 700A/5720A Series II Remote Programming Reference Guide
5725A Instruction Manual 1-6 1-9. 5700A/5720A Series II Remote Programming Reference Guide The 5700A/5720A Series II Remote Programming Reference Guide contains a summaryof remote commands for the 5700A. It also contains information needed to determinesystem status using the status byte and register...
Page 23 - DC Voltage Specifications
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 Uncertainty ± 5 °C from calibration temperature For fields s...
Page 27 - AC Voltage Specifications
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 Absolute Uncertainty ± 5 °C from calibration temperature Relative Uncertainty ± 1 °C 24 Hours 90 Day...
Page 33 - Resistance Specifications
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 Nominal Value Absolute Uncertainty of Characterized Value ± 5 °C from calibration temperature [Note 1] Relative Unce...
Page 37 - DC Current Specifications
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 Uncertainty ± 5 °C from calibration temperature For fields strengths >0.4 V/m but ≤ 3 V...
Page 39 - AC Current Specifications
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 Uncertainty ± 5 °C from calibration temperature For fields...
Page 45 - General Specifications
Introduction and Specifications General Specifications 1 1-29 1-18. General Specifications Warm-Up Time: Twice the time since last warmed up, to a maximum of 30 minutes. System installation: Rear output configuration and rack- mount kit available. Standard interfaces: IEEE-488, RS-232, 5725A, 5205A ...
Page 47 - Chapter 2; Installation
2-1 Chapter 2 Installation Title Page 2-1. Introduction .......................................................................................... 2-3 2-2. Unpacking and Inspection .................................................................... 2-3 2-3. Service Information ........................
Page 49 - Warning
Installation Introduction 2 2-3 Warning The 5725A amplifier is capable of supplying lethal voltages. Donot touch the 5700A output terminals. Read this section beforeoperating the 5725A. 2-1. Introduction This section provides instructions for unpacking and installing the 5725A. Proceduresfor line vo...
Page 51 - Service Information; Information; Considerations; Caution
Installation Service Information 2 2-5 2-3. Service Information Each 5725A Amplifier is warranted to the original purchaser for a period of one yearbeginning on the date received. The warranty is located at the front of this manual. Factory-authorized service and technical advice for the 5725A is av...
Page 52 - Connect the other end to the 5700A connector labeled 5725A.
5725A Instruction Manual 2-6 2-6. Connecting to the 5700A Calibrator 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.Dress the cab...
Page 53 - Selecting Line Voltage; 0% and a frequency range of 47 to 63 Hz. The line; CAUTION
Installation Selecting Line Voltage 2 2-7 2-7. Selecting Line Voltage The 5725A arrives from the factory configured for the line voltage normally appropriatefor the country of purchase, or as specified at the time of purchase. Check the line powerlabel on the rear panel of the 5725A to verify that t...
Page 54 - Note
5725A Instruction Manual 2-8 2-8. Accessing the Fuse Caution To prevent instrument damage, verify that the correct fuse isinstalled for the line voltage setting. Acceptable fuse types areBussman type MTH or Littelfuse type 312 or equivalent, of theappropriate amperage rating. Use only a 4A, 250V fas...
Page 55 - Connecting to Line Power
Installation Connecting to Line Power 2 2-9 2-9. Connecting to Line Power Warning To avoid shock hazard, connect the factory-supplied, three-conductor line power cord to a properly grounded power outlet.Do not use a two-conductor adapter or extension cord; this willbreak the protective ground connec...
Page 57 - Chapter 3; Operating Notes
3-1 Chapter 3 Operating Notes Title Page 3-1. Introduction .......................................................................................... 3-3 3-2. Front Panel Features ............................................................................. 3-4 3-3. Rear Panel Features ................
Page 61 - Rear Panel Features
Operating Notes Rear Panel Features 3 3-5 Table 3-1. Front Panel Features A CURRENT OUTPUT Binding Posts The source of all amplified current if the 5725A is configured for front output. You can set the5700A to source all unamplified as well as amplified current through these binding posts. TheLO bin...
Page 63 - Turning on the 5725A Amplifier
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 amplified current if the 5725A is configured for rear output. You can set the5700A to source all its unamplified as well as amplified current through these binding pos...
Page 64 - Up
5725A Instruction Manual 3-8 3-4. Turning on the 5725A Amplifier Warning To avoid electric shock, make sure the 5725A is safelygrounded as described in section 2. Caution Before turning the 5725A on, make sure that the line voltageselection switches are set properly for your line voltage. Referto Fi...
Page 65 - 725A Operating Functions and Modes; -6. 5725A Operating Functions and Modes; Voltage Standby
Operating Notes 5725A Operating Functions and Modes 3 3-9 3-6. 5725A Operating Functions and Modes Warning Both the 5700A and 5725A can produce fatal voltages. boostedvoltage operation produces high voltage at higher currentlevels than normally available from the 5700A. during 5725Avoltage operation...
Page 66 - Standby; The BOOST indicator on the 5700A is lit.
5725A Instruction Manual 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.eps Figure 3-4. Voltage Standby...
Page 69 - Conditions That Activate the 5725A
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 L...
Page 71 - Chapter 4; Theory of Operation
4-1 Chapter 4 Theory of Operation Title Page 4-1. Introduction .......................................................................................... 4-3 4-2. Overall Functional Description ............................................................ 4-3 4-3. 1100V AC Range Functional Descriptio...
Page 73 - 00V) appears on the internal heat sink; Extended frequency range for high ac voltage
Theory of Operation Introduction 4 4-3 4-1. Introduction This section presents theory of operation in increasing level of detail. The 5725AAmplifier is first broadly defined in an overall functional description and block diagram.The overall functional description continues in more detail with functi...
Page 75 - Overall Functional Description; 1A AC Function; 100V AC Range Functional Description; Active assemblies in the 5725A ac voltage function are as follows:
Theory of Operation Overall Functional Description 4 4-5 • 11A DC Function: The 11A dc function is implemented with a transconductance (voltage in/currentout) amplifier with a gain of -5. If the 5700A outputs -2V into the 5725A, the 5725Aoutput is 10A. (This is transparent to the user.) The output r...
Page 76 - 1A Range Functional Description
5725A Instruction Manual 4-6 The 5700A/5725A system uses the following method for ac amplitude control: 1. An rms thermal sensor alternately measures two signals: an unknown but adjustableac signal, and a known calibrated dc signal. 2. The output of the thermal sensor is measured by the adc, allowin...
Page 77 - Operation in the 11A DC Range; Voltage and Current Standby Modes
Theory of Operation Overall Functional Description 4 4-7 4-5. Operation in the 11A DC Range For the dc current function, the 5700A is configured for the dc 2.2V range. The 5700A2V dc range drives an error amplifier with an input impedance of 40 k Ω . The gain of this amplifier is determined by this ...
Page 78 - The following list describes the five 5725A out-guard lines:
5725A Instruction Manual 4-8 4-10. How the 5700A and 5725A Communicate The 5725A and 5700A maintain all analog and digital communication over an externalcable connected to subminiature D-type connectors on the back of each instrument. Allin-guard (analog) signals, except B-VGRD, connect to relays th...
Page 79 - The following list describes the 11 5725A in-guard lines:
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 bemeasured by the 5700A adc during either 5725A calibration or ...
Page 81 - Detailed Circuit Description
Theory of Operation Detailed Circuit Description 4 4-11 • High Voltage Power Amplifier Assembly (A3) • Power amplifier • Harness to heat sink and its high voltage power devices • Connections to the output transformers • High voltage heat sink temperature monitoring circuitry • High Voltage Sense Ass...
Page 85 - 5V supplies. If either of these supplies
Theory of Operation Detailed Circuit Description 4 4-15 4-19. Current-Limit Section Resistors R313 and R329 are current shunts for the high voltage supplies. These areconnected in series with the bridge rectifiers, with the common point between the shuntsbeing the high voltage supply common, HVCOM. ...
Page 89 - 1A dc or 11A ac. The 5700A drives the Current Amplifier
Theory of Operation Detailed Circuit Description 4 4-19 4-31. Break-Detect Circuitry The 6303Y divides the 4.9152-MHz crystal frequency by four to create the 1.2288-MHzECLK. This signal serves as the clock for the 74HC4020 counter (U506), which isconfigured as a divide-by-16384. The RECEIVE line is ...
Page 92 - C signal the
5725A Instruction Manual 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 duringcalibration of the 5725A current amplifier. The calibration amplifier output is fed backto the 5700...
Page 93 - Current Standby
Theory of Operation Detailed Circuit Description 4 4-23 4-38. Control and Switching Section Refer to page 2 of the Current Amplifier schematic. Relays K201 through 209, Q214through 216, and U209 through 210 configure the Current Amplifier circuitry for thefollowing six modes: • Current Standby Curre...
Page 94 - The High Voltage Amplifier assembly uses the
5725A Instruction Manual 4-24 4-40. High Voltage Amplifier (A3) The High Voltage Amplifier assembly, operating with the step-up signal transformers,constitutes an amplifier with an inverting gain of 100. It amplifies 2.2V to 11V signalsfrom the 5700A Oscillator and returns 220V to 1100V to the 5700A...
Page 97 - -45. Transconductance and Cascode Stage; 0V). A gate resistor similar to R675 suppresses high frequency
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 currentby Q602. The nominal current is about 8.5 mA. This implies that the nominal outputvoltage of the input amplifier is abo...
Page 98 - 00V on them during normal
5725A Instruction Manual 4-28 compensate for the capacitance seen at the gates of the power MOSFETs on the #1 heatsink assemblies. Their sources establish the voltage on the gates of the cascode FETs inthe midstage, Q654 and Q662. The power MOSFETs are in the TO3 package and are mounted to the heat ...
Page 99 - 00V supplies are turned off. Transistor Q606 forces the minimum
Theory of Operation Detailed Circuit Description 4 4-29 Op amp U606B senses the -400V supply and forces the autobias to the minimum biascondition when the ± 400V supplies are turned off. Transistor Q606 forces the minimum bias condition when the window comparator is activated. 4-51. High Voltage Amp...
Page 102 - Serial Interface/Guard Crossing Section
5725A Instruction Manual 4-32 • Serial Interface/Guard Crossing Section The serial interface/guard crossing section consists of an RS-232 interface integratedcircuit that provides the hardware for 5700A/5725A communication within the5725A. Two optoisolators provide the serial guard crossing to the D...
Page 104 - 5V power supply range. Table 4-4 shows the signal name of the
5725A Instruction Manual 4-34 latch up by eliminating positive feedback resulting from positive output voltages fromU100. Op amp U105 is simply a low-noise inverting amplifier that scales the sensoroutput to 10 dB below the 5700A Oscillator output level. The output of the calibrationcircuit, AC/AC, ...
Page 109 - Chapter 5; Calibration and Verification
5-1 Chapter 5 Calibration and Verification Title Page 5-1. Introduction ............................................................................................ 5-3 5-2. Where to Find Further Information ........................................................ 5-3
Page 113 - static awareness; A Message From; Fluke Corporation
Some semiconductors and custom IC's can bedamaged by electrostatic discharge duringhandling. This notice explains how you canminimize the chances of destroying such devicesby: 1. Knowing that there is a problem.2. Leaning the guidelines for handling them.3. Using the procedures, packaging, and bench...
Page 115 - Chapter 6; Maintenance
6-1 Chapter 6 Maintenance Title Page 6-1. Introduction .......................................................................................... 6-3 6-2. Replacing the Fuse ............................................................................... 6-3 6-3. Cleaning the Air Filter.................
Page 117 - Replace the line power fuse
Maintenance Introduction 6 6-3 Warning Servicing described in this section is to be done by qualifiedservice personnel only. To avoid electrical shock, do notservice the 5725A unless you are qualified to do so. 6-1. Introduction This section explains how to do routine maintenance tasks and how to ac...
Page 118 - To clean the air filter, refer to Figure 6-2 and proceed as follows:
5725A Instruction Manual 6-4 100V110V115V 120V S2 S3 S4 VOLTAGE SELECTION FUSE F8A 250V (FAST) 200V220V230V240V S2 S3 S4 F4A 250V (FAST) JOHN FLUKE MFG. CO., INC. MADE IN U.S.A. PATENTS PENDING NO INTERNAL USER SERVICEABLEPARTS REFER SERVICE TOQUALIFIED SERVICE PERSONNEL TO CLEAN FILTERREMOVE FROM I...
Page 119 - General Cleaning; Cleaning; PCA’s
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 asoft cloth slightly dampened with water or a non-abrasive mild cleaning solution thatdoes not harm plastics. ...
Page 120 - Procedures
5725A Instruction Manual 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 isconstructed so that two modules are completely accessible from the top, and twomodule...
Page 121 - Access Procedures; Turn off the POWER switch.
Maintenance Access Procedures 6 6-7 Warning Follow the instructions under "Initial Access Procedure" tomake sure high voltage has been bled off before you touchanything inside the 5725A. If you work on a 5725A with the power cord attached, and/oryou are not certain the high voltage has not b...
Page 123 - Perform the Initial Access Procedure.
Maintenance Access Procedures 6 6-9 8. Take another DMM reading with the common lead to TP307 and the high lead toTP304 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. 6-8. Accessing ...
Page 128 - -13. Accessing the High Voltage Output Transistors
5725A Instruction Manual 6-14 6-13. Accessing the High Voltage Output Transistors Warning During normal operation, the high voltage heat sinks are atlethal voltage. To avoid electrical shock, do not proceed withthe following access procedure until you have completed theinitial access procedure, whic...
Page 129 - Enabling Front or Rear Binding Posts; Turn over the 5725A so that the top is facing up.; -15. Enabling Front or Rear Binding Posts; Proceed as follows to change the current output location:
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 HighVoltage Output Transistors", steps 2 through 4. 8. Remove the two screws that secure the Interconnect a...
Page 130 - Reinstall the top cover.
5725A Instruction Manual 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 the unused connector is neatly secured in therecessed area of the chassis side, away from the High Volt...
Page 131 - Chapter 7; Troubleshooting
7-1 Chapter 7 Troubleshooting Title Page 7-1. Introduction .......................................................................................... 7-3 7-2. 5725A Fault Codes ............................................................................... 7-3 7-3. Self Diagnostics.....................
Page 133 - Diagnostics
Troubleshooting Introduction 7 7-3 7-1. Introduction This section provides troubleshooting information in three parts. First a listing of all5725A fault codes is provided for reference in Table 7-1. Following that is a descriptionof 5725A automated self-diagnostics that you run from the 5700A. Final...
Page 135 - Self Diagnostics
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 timer) 231 5725 Guard-Crossing Timeout 232 5725 Illegal/Unexecutable Command 233 5725 Non-Maskable Int...
Page 136 - Normal at power-up, but trips out when entering current standby
5725A Instruction Manual 7-6 7-4. Manual Tests for Fault Isolation Warning The following servicing is to be done by qualified servicepersonnel only. To avoid electrical shock, do not service the5725A unless you are qualified to do so. Follow the access procedures and warnings in section 6 toopen the...
Page 137 - Manual Tests for Fault Isolation; Proceed as follows to isolate the problem in these conditions:
Troubleshooting Manual Tests for Fault Isolation 7 7-7 7-5. Problems 1 or 2: Fault at Power-Up or When Entering VoltageStandby 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 fromTable 7-2. If the fault i...
Page 138 - Problem 3: Fault When Entering Voltage Operate; Proceed as follows to isolate the problem in this condition:; Problem 4: Fault When Entering Current Standby; Problem 5: Fault When Entering Current Operate; Proceed as follows to isolate a problem in this condition:
5725A Instruction Manual 7-8 7-6. Problem 3: Fault When Entering 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 Assembly as in step 1on conditions 1 and 2. 3. Suspe...
Page 139 - Testing the Power Supply By Itself; 0V mode. The high voltage amplifier may also be
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 powersupply will power up in the ± 50V mode. The high voltage amplifier may also be serviced in the ± 50V mode. 7-10. Testing the Power Supply By Itself To turn on ...
Page 141 - Chapter 8; List of Replaceable Parts
8-1 Chapter 8 List of Replaceable Parts Title Page 8-1. Introduction .......................................................................................... 8-3 8-2. How to Obtain Parts ............................................................................. 8-3 8-3. Manual Status Informatio...
Page 145 - Parts Lists
List of Replaceable Parts Parts Lists 8 8-5 Table 8-2. Final Assembly (cont) Reference Designator Description Fluke Stock No Tot Qty Notes H437 SCREW,PH,P,LOCK,SS,6-32,.750 376822 2 H439 SCREW,TH,P,LOCK,STL,8-32,.250 853622 4 H443 SCREW,PH,P,LOCK,STL,6-32,.625 152181 4 H505 NUT,HEX,BR,1/4-28 110619 ...
Page 181 - Chapter 9; Schematic Diagrams
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. A3 High Voltage Amplifier PCA..............
Page 205 - Index
1 Index —5— 5700A CALIBRATOR connector, 2-6, 3-7Connecting to, 2-6 5725A STANDBY indicator, 3-5 —A— A1. See Interconnect assemblyA2. See Current Amplifier assemblyA3. See High Voltage Amplifier assemblyA4. See Power Supply assemblyA5. See Digital assemblyA6. See High Voltage Sense assemblyAC current...
