5725A
Page
 Table of Contents
 5725A
 Calibration and Verification
 5725A
 List of Tables
 5725A
 List of Figures
 Viii
 Interference Information
Page
 Operator Safety Summary
 Symbols Marked on Equipment
 Servicing Safety Summany
 First AID for Electric Shock
 Introduction and Specifications
 5725A
 Introduction
 Where to Go From Here
 5700A Operator Reference Guide
How to Use the Manuals
5700A Operator Manual
5700A Remote Programming Reference Guide
 Specifications
 Linearity Bandwidth
Stability Temperature Coefficient Noise Range
Overshoot 5% Common mode rejection 140 dB, DC to 400 Hz
10 Hz
 AC Voltage
5725A Amplifier
 ±ppm output + mV
 Maximum Current Load Limits
Voltage Range
Frequency Hz Settling time seconds
 Nominal Value
Temperature
Two-Wire Adder active compensation Note Lead Resistance
Coefficient
 II L UII MAX
 DC Current
± ppm output + μA
 AC Current
Relative Uncertainty ±1C Hours Days Year ± ppm output + nA
 10C
 Range Absolute Uncertainty
Volts DBm Resolution Hours Days ± % output + μV Year
Wideband AC Voltage Option
Hz-500 kHz
 Guard isolation 20 volts
General Specifications
Temperature performance Operating 0C to 50C
Size
 5725A
 Installation
 5725A
 Standard Equipment
Unpacking and Inspection
Model or Part Number
 Line Power Cord Types Available from Fluke
Line Power Cords Available for Fluke Instruments
 Placement and Rack Mounting
Service Information
Cooling Considerations
 Connecting to the 5700A Calibrator
Correct Way to Dress Interface Cable
 100V 110V F8A 115V
Selecting Line Voltage
120V S2 S3 S4 200V 220V 230V F4A
 Accessing the Fuse
Accessing the Fuse
 Connecting to Line Power
 5725A
 Operating Notes
 5725A
 Operating Notes
 Front Panel Features
Front Panel Features
 Current Mode Indicator
Front Panel Features Current Output Binding Posts
5725A Standby Indicator
Voltage Mode Indicator
 Rear Panel Features
Rear Panel Features
 5700A Calibrator Connector
Rear Panel Features Current Output Binding Posts
Calibration Switch
Line Voltage Selection Switches
 Turning on the 5725A Amplifier
Warm Up
 5725A Operating Functions and Modes
Standby
 Voltage Standby
 Current Standby
 Voltage Operate
 Current Operate
 Conditions That Activate the 5725A
 Theory of Operation
 High Voltage Heat Sink Assemblies
 Overall Functional Description
 A Overall Block Diagram
 1100V AC Range Functional Description
 11A Range Functional Description
 Voltage and Current Standby Modes
Operation in the 11A DC Range
Operation in the 11A AC Range
Voltage Standby
 How the 5700A and 5725A Communicate
Description of the Out-Guard Lines 5725A Side
 Description of the In-Guard Lines
∙ B-RCL
 Functional Summaries by Assembly
∙ B-FEEDBACK
 Interconnect Assembly A1
Detailed Circuit Description
 Power Supply Assembly A4
 High Voltage Supply Section
Internal Fuse Data
 Switching Section
 Current-Limit Section
System Supply Section
 Microcomputer
Digital Assembly A5
Fan Supply Section
External RAM
 Digital Assembly Block Diagram
 Led Driver
Data Latch
Strobe Lines
Optoisolator Link
 Current Amplifier Assembly A2
Power Up and Reset Circuitry
Watchdog Timer
Break-Detect Circuitry
 Current Amplifier Assembly Block Diagram
 Error Amplifier Section
 Output Stage Section
Monitor Section
 Control and Switching Section
Power Supply Section
 High Voltage Amplifier A3
Input Amplifier
 High Voltage Amplifier Assembly Block Diagram
 Window Comparator
Integrator
Input Clamp
 Midstage -400V Filter
Transconductance and Cascode Stage
Midstage
High Voltage Heat Sink Assemblies
 Autobias Current Source
Autobias Sense Circuit
 Signal Transformer Usage
Signal Transformers
Temperature Monitoring
High Voltage Amplifier Feedback
 High Voltage Sense Assembly A6
 High Voltage Sense Assembly Block Diagram
 Sense Amplifier Section
 Destination Assembly
High-Quality Reference Name Destination
 Signals Monitored by the Analog Monitor Section
Analog Monitor Section
 Analog Input Switching Section
Serial Interface/Guard Crossing Section
 Control Section
 AC Line Voltage Selection Section
 5725A
 Calibration and Verification
 5725A
 Where to Find Further Information
 5725A
 Maintenance
 5725A
 Replacing the Fuse
 Cleaning the Air Filter
 General Cleaning
Cleaning PCA’s
 Access Procedures
Assembly Location Diagram
 Initial Access Procedure
WWarning
 TP307
TP304 TP301
 Accessing the Power Supply Assembly A4
Accessing the Digital Assembly A5
 When Reinstalling Digital Assembly
 Accessing the Current Amplifier Assembly A2
 Accessing the High Voltage Amplifier A3
Correct Way to Dress Cables
 Accessing the High Voltage Sense Assembly A6
 Accessing the High Voltage Output Transistors
Accessing the Interconnect Assembly A1
 Enabling Front or Rear Binding Posts
 Enabling Front or Rear Binding Posts
 Troubleshooting
 5725A
 5725A Fault Codes
Self Diagnostics
 A Fault Codes
Fault Message Explanation
 Self Diagnostics
 Manual Tests for Fault Isolation
 Analog Monitor Faults
Fault no Message
 Problem 4 Fault When Entering Current Standby
Reduced-Voltage Troubleshooting Mode
Problem 3 Fault When Entering Voltage Operate
Problem 5 Fault When Entering Current Operate
 Testing the Power Supply By Itself
 5725A
 List of Replaceable Parts
 5725A
 Manual Status Information
How to Obtain Parts
Newer Instruments
 Revision Level Final Assembly
Service Centers
Assembly Name
Ref or Option No
 TM1
 Aq24f.tif
 Aq25f.tif
 Aq26f.tif
 Aq27f.tif
 Aq28f.tif
 Aq29f.tif
 Aq30f.tif
 Aq31f.tif
 A1 Interconnect PCA
 5725A-1611
 A2 Current Amplifier PCA
 List of Replaceable Parts
 Reference Description Designator Fluke Stock Tot Qty
 5725A-1650
 A3 High Voltage Amplifier PCA
 Reference Description
 JUMPER,WIRE,NONINSUL,0.200CTR
 5725A-1661
 A4 Power Supply PCA
 PAD, Adhesive
 HARNESS, High Voltage Supply
 5725A-1631
 A5 Digital PCA
 5725A-1650
 A6 High Voltage Sense PCA
HEADER,1 ROW,.156CTR,12 PIN
 List of Replaceable Parts
 ZENER,UNCOMP,3.3V,5%,20.0MA,0 ZENER,UNCOMP,5.1V,5%,20.0MA,0
 5725A-1601
 A12 Transformer Enclosure Assembly
 Aq32f.tif
 Aq33f.tif
 Aq34f.tif
 Aq35f.tif
 A30 Inductor PCA
 5725A
 Schematic Diagrams
 5725A
 5725A-1611
 5725A
 Schematic Diagrams
 5725A-1650
 Schematic Diagrams
 5725A
 Schematic Diagrams
 5725A-1661
 Schematic Diagrams
 5725A
 Aq59f.eps
 5725A
 Schematic Diagrams
 AT Pins 12 and 13 of U507 5725A-1650
 Schematic Diagrams
 5725A-1601
 Schematic Diagrams
 5725A
 Schematic Diagrams
 5725A
 Aq45f.eps
 5725A
 Index
 5725A STANDBY, 3-5CABLE OFF, 3-5CURRENT MODE, 3-5FAULT
 Chassis GROUND, 3-7CURRENT OUTPUT, 3-5,3-7HI, 3-5,3-7
 5725A
 Manual Supplement
 Change #1