Equipment information

Keithley 228A Current source
Model 228A
Date 1984
Category: Measurement instruments
Group Current source
Description Voltage / Current Source
                                    The Model 228 Voltage/Current Source is both a constant
voltage and constant current source with front panel and
IEEE operation. The Model 228 can be used as a constant
voltage source or a constant current source. It has four
quadrant operation. This means that the voltage or current
sources can operate as a source or a sink in either positive
or negative polarities. Full power capability of 100W may be
obtained in any quadrant.
Parameter entry is done in one of two ways. Either using the
data keypad to enter the desired value into the display or
using the display modify function. The display modify
function allows the user to modify either display by
selecting a digit of the display and incrementing or
decrementing that digit with the appropriate keys. With the
carry, borrow and autorepeat capability, front panel
operation is flexible and easy to program. The user selects
the range with the decimal point.

The Model 228 has a 100 point data memory that allows the
user to store up to 100 unique values of current, voltage
and dwell time for future use. Once a particular level is
stored in the data memory, the user need not reprogram that

The output terminals are located on a quick disconnect board
that inserts into the rear panel of the mainframe. The
output is disconnected from the quick disconnect board when
it is removed from the mainframe.

These manuals are available for the above equipment:

Manual Type Service and User Manual Keithley-5555-Manual-Page-1-Picture
Pages 130
Size 12.36 Mbytes (12963869 Bytes)
Language english
Revision D
Manual-ID/Number 228A-901-01
Date April 1991
Quality Scanned document, all readable.
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MD5 dc4d99251839c0608de17d1dec56d0e8
Downloads 355 since 02 March 2014

Manual Type Datasheet Keithley-5590-Manual-Page-1-Picture
Pages 2
Size 798.05 Kbytes (817201 Bytes)
Language english
Quality Scanned document, all readable.
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MD5 81f553d1105ed533ec4fe949eff8b0cf
Downloads 201 since 07 March 2014

Manual Type User Manual Keithley-5612-Manual-Page-1-Picture
Pages 56
Size 632.38 Kbytes (647554 Bytes)
Language english
Revision A
Manual-ID/Number 228-903-01
Date 1984
Quality Scanned document, reading partly badly, partly not readable.
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MD5 69072755034a5def5bdd8f023a48e6ac
Downloads 194 since 07 March 2014
Quick Reference Guide

Manual Type User Manual Keithley-5613-Manual-Page-1-Picture
Pages 38
Size 1.04 Mbytes (1085336 Bytes)
Language english
Manual-ID/Number 228A-904-01
Date 1985
Quality Scanned document, all readable.
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MD5 35c6e5299d50814b00f60a266c3dd2e1
Downloads 205 since 07 March 2014
Application and Reference Guide

This booklet has been written to help the user understand
the operation and specifications of the Model 228
Voltage/Current Source. The chapters in this booklet have
been written to aid the user in some applications. Terms
relating to the V/I source such as: stability, line
regulation, load regulation and sensing are defined in the
glossary. For a complete explanation of the instrument
including front panel controls and IEEE-488 bus operation
refer to the Model 228 Instruction Manual (Document Number

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