Equipment information:

Fluke 4270A Power supply
Manufacturer:
Fluke
Model: 4270A
Date: 1979
Category: Measurement instruments
Group: Power supply
Description: BCD Programmable Power Source
Information:
                                    1-2. The Model 4270A is a programmable, bipolar dc voltage
source and.ac power amplifier. Output voltage is from 0 to
±1 lOVdc in two ranges, 10 and XIOVdc. Programming
resolution using the internal reference voltage is lmV on
the 10 volt range and 10mV on the X10 volt range. Output
accuracy is given in paragraph 1-6. After a IQQßs settling
time, a READY flag indicates that the output has settled to
±0.01% of the programmed level for a resistive load. The
output current is rated at ±0.5 ampere maximum and is
limited to approximately ±0.6 ampere in the event of an
overload or short circuit. The sink current (milliamps) is
rated at 500--4.5E OUT maximum. A Programmable Current
Limiter (Option —06) is available to allow programming the
maximum output current to a lower level. A current limit
flag indicates when a sink or source current overload exists
with or without the —06 Option.
1-3. Programming requirements are compatible with DTL or TTL
logic levels. Contact or relay closures can also be used.
The voltage source is programmable using BCD or
binary-per-decade coding, using 84-2-1 format. All
programming inputs and flag outputs are made through a 50-
pin Amphenol, Blue Ribbon connector located on the rear
panel. A +5Vdc output is also available at this connector
and is used to provide power for external programming
circuitry. Negative logic is employed for programming. The
logic levels are as follows:
Logic “0” = +2.0Vdc to +5 .OVdc or open circuit.
Logic “1 ” = 0 to +0.4Vdc or short circuit to LOGIC GND.
14. Four options are available and provide tailoring of the
power supply to fit application requirements. These options
are identified by numeric designations —03, —06, —07, and
—09. Each option is described in Table 1-1. The options can
be installed at the factory when the instrument is ordered
or in the field at a later time.
1-5. This power source is completely solid state. Plugin
printed circuit boards, with accessible test points and
adjustments, are provided for ease in servicing. The unit is
forced-air cooled. This results in lower component
temperatures and higher reliability than would normally be
obtained in a source of this power capability. The chassis
is designed for bench top use, or it can be installed in a
standard equipment rack by using the Accessory Rack Mounting
Fixtures.

These manuals are available for the above equipment:

Fluke -- 4270A -- Service and User Manual
File name: Fluke-7711-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 184
Size: 11.35 Mbytes (11903910 Bytes)
Language: english
Revision: 1
Manual-ID/Number: 338418
Date: May 1979
Quality: Scanned document, all readable.
Upload date:
MD5: a97be03b1aacc4d0c6587dab0a6861e9
ed2kID: 28ce27abd67216a343395523a44c450c
Downloads: 36 since 10 February 2016
Information:
1 INTRODUCTION AND
SPECIFICATIONS...................................................
1-1
M.
INTRODUCTION........................................................................
1-1
1-6.
SPECIFICATIONS........................................................................
1-3
2 OPERATING
INSTRUCTIONS........................................................................
2-1
2-1.
INTRODUCTION.......................................................................
2-1
2-3. SHIPPING
INFORMATION........................................................
2-1
2-6. INPUT
POWER.............................................................................
2-1
2-8. RACK
INSTALLATION.............................................................
2-2
2-10. OPERATING
FEATURES........................................................
2-2
2-12. OPERATING NOTES
...................................................................
2-4
2-14. AC Line
Connection..................................................................
2-4
2-16. Load
Connections..................................................................
2-4
2-18. Remote
Sensing.......................................................................
24
2-20. Ground
Connections.............................................................
2-4
2-22. Guard
Connections..................................................................
24
2-24. PROGRAMMING
INFORMATION.............................................. 2-5
2-27.
Standby.......................................................................................
2-5
2-29. Range/Output
Magnitude/Polarity......................................... 2-5
2-33. Data
Strobe.............................................................................
2-6
2-35. Flag
Outputs.............................................................................
2-7
2-38. Programmable Current Limiting......................... 2-7
241. External
Reference..................................................................
2-7
245. Front Panel
Indicators................................................... 2-8
247. Dynamic
Characteristics........................................................
2-8
3 THEORY OF
OPERATION.............................................................................
3-1
3-1.
INTRODUCTION............................................................
34
3-3. FUNDAMENTAL CIRCUIT
DESCRIPTION.......................... 3-1
3-5. BLOCK DIAGRAM
ANALYSIS................................................... 3-1
3-14. CIRCUIT
DESCRIPTIONS........................................................
3-3
3-16. A1 Mother Board and A7 BCD Display (4270A-1011) . . 3-3
3-18. A2 Power Supply and A10 Connector Board (4270A-1061
and 4270A-1012)
................................................... 3-3
3-40. A3 Preamplifier
(4275A-1051).....................................................34
3-58. A4 External Reference
(4250A-1041)...........................................3-5
3-66. A5 BCD Ladder
(4210A-1031).....................................................3-6
3-74. A6 Isolated Control Logic (4275
A-1021).....................................3-7
3-91. A8 Programmable Current Limiter (4270A-1081) .... 3-11
3-109. A9 Power Amplifier
(4270A-1071)...............................................3-12
4
MAINTENANCE.......................................................................................................4-1
4-1.
INTRODUCTION..............................................................................4-1
4-3. SERVICE
INFORMATION...............................................................4-1
4-6. GENERAL
MAINTENANCE...............................................................4-1
4-7.
Cleaning..............................................................................................4-1
4-9. Air Filter
Cleaning.........................................................................4-1
4-11. Fuse
Replacement.........................................................................4-1
4-13. MAINTENANCE
....................................................................................4-2
4-15. INVERTED CONTROL LOGIC .
.....................................................4-3
4-17.
CALIBRATION...................................................................................4-3
4-19. Initial
Procedure........................................................*
· · 4-3
4-20. Power Amplifier Bias
Adjustment....................................................4-5
4-21. Bit Adjustment (0.4).....................4-5
4-22. Zero, Reference, and Bit Adjustment
............................................4-6
4-23. External Reference Adjustment (—03
Option)............................4-6
4-25. Current Limiter Adjustment (—06
Option).................................4-6
4-27. Final Zero Adjustment
.....................................................................4-7
4-29. Output
Checks..................................................................
. 4-7
5 LISTS OF REPLACEABLE
PARTS.....................................................................5-1
5-1. INTRODUCTION
...............................................................................5-2
54. HOW TO OBTAIN
PARTS................................................................5-2
6 OPTIONS AND ACCESSORIES .
...........................................................................6-1
6-1.
INTRODUCTION...............................................................................6-1
6-3. OPTION
INFORMATION.....................................................................6-1
6-5. ACCESSORY
INFORMATION...........................................................6-1
Option —07 lOOuV Resolution Schematic Diagram 4210A-1032
Option —09, Multi-Strobe Isolated Logic Schematic Diagram
Model A4200 Manual Control Unit Schematic Diagram A4200-1000
Rack Mounting Fixtures Programming Connector
Extender PCB Assembly and Cable Extender Assembly
7 GENERAL INFORMATION .
........................................................ 7-1
8 SCHEMATIC
DIAGRAMS.............................................................................
8*1
Fluke-7711-Manual-Page-1-Picture
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