Equipment information:

Fluke 5725A Amplifier
Manufacturer:
Fluke
Model: 5725A
Date: 1989
Category: Measurement instruments
Group: Amplifier
Description: Amplifier
Information:
                                    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.
A diagram in the specifications tables at the end of this
section illustrates the extended ac volt-hertz product
achieved by using a 5725A. Increased ac voltage load limits
allow using the 5700A Calibrator in systems with long cables.
Voltage output from the 5725A is available at the 5700A
Calibrator front or rear binding posts. This eliminates the
need to move cables during a procedure that requires
amplified as well as standard calibrator outputs.
The 5725A front or rear panel OUTPUT binding posts are only
for current output. Extended-range ac and dc current is
supplied through them. Since most meters with a high current
range use a separate high current input terminal, this
configuration normally eliminates the need to move cables
during a procedure. If a single-point current output is
needed, the 5700A Calibrator can be configured to source all
current outputs through the 5725A binding posts.
Enhancements to 5700A ac voltage output capability provided
by the 5725A are as follows:
· Frequency limits at higher voltage increase to 100 kHz at
750V, 30 kHz at 1100V.
· Load limits are to 70 mA for frequencies above 5 kHz, and
to 50 mA for frequencies less than 5 kHz.
· Capacitive load limits are increased to 1000 pF.
Model 5725A operating functions and ranges are as follows:
· AC voltage: 220 to 1100V rms up to 70 mA (50 mA < 5 kHz),
40 Hz to 30 kHz; 220 to 750V rms up to 70 mA, 30 kHz to 100 kHz
· DC current: 0 to ±11A
· AC current: 1 to 11A rms, 40 Hz to 10 kHz

These manuals are available for the above equipment:

Fluke -- 5725A -- Service and User Manual
File name: Fluke-7691-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 196
Size: 35.67 Mbytes (37400735 Bytes)
Language: english
Revision: 6
Manual-ID/Number: 823435
Date: June 1996
Quality: Scanned document, all readable.
Upload date:
MD5: 6c0bcdef5bc876b4df82675ddd412633
ed2kID: e9d5872312482d41ac0499ef4c233466
Downloads: 51 since 06 February 2016
Information:
1 Introduction and
Specifications.............................................................1-1
1-1.
Introduction..........................................................................................................1-3
1-2. Where to Go From
Here....................................................................................1-4
1-3. How to Use the
Manuals....................................................................................1-5
1-4. 5725A Instruction
Manual...........................................................................1-5
1-5. 5700A Operator
Manual..............................................................................1-5
1-6. 5700A Operator Reference
Guide.............................................................1-5
1-7. 5700A Remote Programming Reference
Guide.....................................1-5
1-8. 5700A Service
Manual..................................................................................1-6
1-9.
Specifications.......................................................................................................1-6
2
Installation.................................................................................................2-1
2-1.
Introduction..........................................................................................................2-3
2-2. Unpacking and
Inspection.................................................................................2-3
2-3. Service
Information............................................................................................2-5
2-4. Placement and Rack
Mounting........................................................................2-5
2-5. Cooling
Considerations......................................................................................2-5
2-6. Connecting to the 5700A
Calibrator..............................................................2-6
2-7. Selecting Line
Voltage......................................................................................2-7
2-8. Accessing the
Fuse..............................................................................................2-8
2-9. Connecting to Line
Power.................................................................................2-9
3 Operating
Notes.......................................................................................3-1
3-1.
Introduction..........................................................................................................3-3
3-2. Front Panel
Features...........................................................................................3-4
3-3. Rear Panel
Features............................................................................................3-6
3-4. Turning on the 5725A
Amplifier.....................................................................3-8
3-5. Warm
Up...............................................................................................................3-8
3-6. 5725A Operating Functions and
Modes........................................................3-9
3-7.
Standby..............................................................................................................3-9
3-8 Voltage
Standby..............................................................................................3-10
3-9. Current
Standby..............................................................................................3-11
3-10. Voltage Operate
..............................................................................................3-12
3-11. Current
Operate...............................................................................................3-13
3-12. Conditions That Activate the
5725A.............................................................3-14
Chapter Title Page
4 Theory of
Operation.................................................................................4-1
4-1.
Introduction..........................................................................................................4-3
4-2. Overall Functional
Description........................................................................4-3
4-3. 1100V AC Range Functional
Description...............................................4-5
4-4. 11A Range Functional
Description............................................................4-6
4-5. Operation in the 11A DC
Range............................................................4-7
4-6. Operation in the 11A AC
Range............................................................4-7
4-7. Voltage and Current Standby
Modes........................................................4-7
4-8. Voltage
Standby.........................................................................................4-7
4-9. Current
Standby.........................................................................................4-7
4-10. How the 5700A and 5725A Communicate
.............................................4-8
4-11. Description of the Out-Guard Lines (5725A
Side)..........................4-8
4-12. Description of the In-Guard
Lines........................................................4-9
4-13. Functional Summaries by
Assembly.........................................................4-10
4-14. Detailed Circuit
Description............................................................................4-11
4-15. Interconnect Assembly
(A1).......................................................................4-11
4-16. Power Supply Assembly
(A4).....................................................................4-12
4-17. High Voltage Supply
Section................................................................4-13
4-18. Switching
Section.....................................................................................4-14
4-19. Current-Limit
Section...............................................................................4-15
4-20. System Supply
Section............................................................................4-15
4-21. Fan Supply
Section...................................................................................4-16
4-22. Digital Assembly
(A5)..................................................................................4-16
4-23.
Microcomputer..........................................................................................4-16
4-24. External
RAM............................................................................................4-16
4-25. External
ROM............................................................................................4-16
4-26. EEROM
.......................................................................................................4-18
4-27. Data
Latch....................................................................................................4-18
4-28. Strobe
Lines................................................................................................4-18
4-29. Led
Driver...................................................................................................4-18
4-30. Optoisolator
Link.......................................................................................4-18
4-31. Break-Detect
Circuitry.............................................................................4-19
4-32. Power Up and Reset
Circuitry...............................................................4-19
4-33. Watchdog
Timer........................................................................................4-19
4-34. Current Amplifier Assembly
(A2).............................................................4-19
4-35. Error Amplifier
Section...........................................................................4-21
4-36. Output Stage
Section................................................................................4-22
4-37. Monitor
Section.........................................................................................4-22
4-38. Control and Switching
Section..............................................................4-23
4-39. Power Supply
Section..............................................................................4-23
4-40. High Voltage Amplifier
(A3)......................................................................4-24
4-41. Input
Amplifier..........................................................................................4-24
4-42.
Integrator......................................................................................................4-26
4-43. Window
Comparator................................................................................4-26
4-44. Input Clamp
................................................................................................4-26
4-45. Transconductance and Cascode
Stage.................................................4-27
4-46.
Midstage......................................................................................................4-27
4-47. Midstage -400V
Filter.............................................................................4-27
4-48. High Voltage Heat Sink
Assemblies....................................................4-27
4-49. Autobias Current Source
........................................................................4-28
4-50. Autobias Sense
Circuit............................................................................4-28
4-51. High Voltage Amplifier
Feedback........................................................4-29
4-52. Signal
Transformers.................................................................................4-29
4-54. High Voltage Sense Assembly
(A6)........................................................4-30
4-55. Sense Amplifier
Section..........................................................................4-32
4-56. Analog Monitor
Section..........................................................................4-34
4-57. Serial Interface/Guard Crossing
Section.............................................4-35
4-58. Analog Input Switching
Section............................................................4-35
4-59. Control
Section..........................................................................................4-36
4-60. AC Line Voltage Selection
Section......................................................4-37
5 Calibration and
Verification...................................................................5-1
5-1.
Introduction..........................................................................................................5-3
5-2. Where to Find Further
Information...............................................................5-3
6
Maintenance..............................................................................................6-1
6-1.
Introduction..........................................................................................................6-3
6-2. Replacing the Fuse
..............................................................................................6-3
6-3. Cleaning the Air
Filter........................................................................................6-4
6-4. General
Cleaning.................................................................................................6-5
6-5. Cleaning
PCA’s.....................................................................................................6-5
6-6. Access
Procedures...............................................................................................6-6
6-7. Initial Access
Procedure..............................................................................6-7
6-8. Accessing the Power Supply Assembly
(A4).........................................6-9
6-9. Accessing the Digital Assembly
(A5).......................................................6-9
6-10. Accessing the Current Amplifier Assembly
(A2)..................................6-11
6-11. Accessing the High Voltage Amplifier
(A3)..........................................6-12
6-12. Accessing the High Voltage Sense Assembly
(A6)..............................6-13
6-13. Accessing the High Voltage Output
Transistors....................................6-14
6-14. Accessing the Interconnect Assembly
(A1)............................................6-14
6-15. Enabling Front or Rear Binding
Posts............................................................6-15
7
Troubleshooting.......................................................................................7-1
7-1.
Introduction..........................................................................................................7-3
7-2. 5725A Fault
Codes..............................................................................................7-3
7-3. Self
Diagnostics...................................................................................................7-3
7-4. Manual Tests for Fault Isolation
....................................................................7-6
7-5. Problems 1 or 2: Fault at Power-Up or When Entering
Voltage
Standby..............................................................................................7-7
7-6. Problem 3: Fault When Entering Voltage
Operate...............................7-8
7-7. Problem 4: Fault When Entering Current
Standby...............................7-8
7-8. Problem 5: Fault When Entering Current
Operate...............................7-8
7-9. Reduced-Voltage Troubleshooting
Mode....................................................7-8
7-10. Testing the Power Supply By
Itself................................................................7-9
8 List of Replaceable
Parts.......................................................................8-1
8-1.
Introduction..........................................................................................................8-3
8-2. How to Obtain
Parts...........................................................................................8-3
8-3 Manual Status
Information...............................................................................8-3
8-4. Newer
Instruments...............................................................................................8-3
8-5. Service
Centers.....................................................................................................8-4
9 Schematic
Diagrams...............................................................................9-1
Index
Fluke-7691-Manual-Page-1-Picture
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