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 Manual
How to Use the Manuals
5700A Operator Reference Guide
5700A Remote Programming Reference Guide
Specifications
Overshoot 5% Common mode rejection 140 dB, DC to 400 Hz
Stability Temperature Coefficient Noise Range
Linearity Bandwidth
10 Hz
5725A Amplifier
AC Voltage
±ppm output + mV
Frequency Hz Settling time seconds
Voltage Range
Maximum Current Load Limits
Two-Wire Adder active compensation Note Lead Resistance
Temperature
Nominal Value
Coefficient
II L UII MAX
± ppm output + μA
DC Current
Relative Uncertainty ±1C Hours Days Year ± ppm output + nA
AC Current
10C
Wideband AC Voltage Option
Volts DBm Resolution Hours Days ± % output + μV Year
Range Absolute Uncertainty
Hz-500 kHz
Temperature performance Operating 0C to 50C
General Specifications
Guard isolation 20 volts
Size
5725A
Installation
5725A
Model or Part Number
Unpacking and Inspection
Standard Equipment
Line Power Cords Available for Fluke Instruments
Line Power Cord Types Available from Fluke
Cooling Considerations
Service Information
Placement and Rack Mounting
Correct Way to Dress Interface Cable
Connecting to the 5700A Calibrator
120V S2 S3 S4 200V 220V 230V F4A
Selecting Line Voltage
100V 110V F8A 115V
Accessing the Fuse
Accessing the Fuse
Connecting to Line Power
5725A
Operating Notes
5725A
Operating Notes
Front Panel Features
Front Panel Features
5725A Standby Indicator
Front Panel Features Current Output Binding Posts
Current Mode Indicator
Voltage Mode Indicator
Rear Panel Features
Rear Panel Features
Calibration Switch
Rear Panel Features Current Output Binding Posts
5700A Calibrator Connector
Line Voltage Selection Switches
Warm Up
Turning on the 5725A Amplifier
Standby
5725A Operating Functions and Modes
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
Operation in the 11A AC Range
Operation in the 11A DC Range
Voltage and Current Standby Modes
Voltage Standby
Description of the Out-Guard Lines 5725A Side
How the 5700A and 5725A Communicate
∙ B-RCL
Description of the In-Guard Lines
∙ B-FEEDBACK
Functional Summaries by Assembly
Detailed Circuit Description
Interconnect Assembly A1
Power Supply Assembly A4
Internal Fuse Data
High Voltage Supply Section
Switching Section
System Supply Section
Current-Limit Section
Fan Supply Section
Digital Assembly A5
Microcomputer
External RAM
Digital Assembly Block Diagram
Strobe Lines
Data Latch
Led Driver
Optoisolator Link
Watchdog Timer
Power Up and Reset Circuitry
Current Amplifier Assembly A2
Break-Detect Circuitry
Current Amplifier Assembly Block Diagram
Error Amplifier Section
Monitor Section
Output Stage Section
Power Supply Section
Control and Switching Section
Input Amplifier
High Voltage Amplifier A3
High Voltage Amplifier Assembly Block Diagram
Input Clamp
Integrator
Window Comparator
Midstage
Transconductance and Cascode Stage
Midstage -400V Filter
High Voltage Heat Sink Assemblies
Autobias Sense Circuit
Autobias Current Source
Temperature Monitoring
Signal Transformers
Signal Transformer Usage
High Voltage Amplifier Feedback
High Voltage Sense Assembly A6
High Voltage Sense Assembly Block Diagram
Sense Amplifier Section
High-Quality Reference Name Destination
Destination Assembly
Analog Monitor Section
Signals Monitored by the Analog Monitor Section
Serial Interface/Guard Crossing Section
Analog Input Switching 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
Cleaning PCA’s
General Cleaning
Assembly Location Diagram
Access Procedures
WWarning
Initial Access Procedure
TP304 TP301
TP307
Accessing the Digital Assembly A5
Accessing the Power Supply Assembly A4
When Reinstalling Digital Assembly
Accessing the Current Amplifier Assembly A2
Correct Way to Dress Cables
Accessing the High Voltage Amplifier A3
Accessing the High Voltage Sense Assembly A6
Accessing the Interconnect Assembly A1
Accessing the High Voltage Output Transistors
Enabling Front or Rear Binding Posts
Enabling Front or Rear Binding Posts
Troubleshooting
5725A
Self Diagnostics
5725A Fault Codes
Fault Message Explanation
A Fault Codes
Self Diagnostics
Manual Tests for Fault Isolation
Fault no Message
Analog Monitor Faults
Problem 3 Fault When Entering Voltage Operate
Reduced-Voltage Troubleshooting Mode
Problem 4 Fault When Entering Current Standby
Problem 5 Fault When Entering Current Operate
Testing the Power Supply By Itself
5725A
List of Replaceable Parts
5725A
Newer Instruments
How to Obtain Parts
Manual Status Information
Assembly Name
Service Centers
Revision Level Final Assembly
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
HEADER,1 ROW,.156CTR,12 PIN
A6 High Voltage Sense PCA
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