SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
The Model 224 is a programmable current source with full
range current output of 20,uA to 101 mA. The smallest step of
output current is 5nA. The Model 224 has a selectable
voltage compliance of up to 105V in IV increments. The
value of output current can be modified in two ways: manual-
ly or automatically. The automatically modified current value
is incremented or decremented by the programmed rate. The
time button allows the modification of the programmed auto
increment/decrement rate. The control of the current value
modification can be activated by an external trigger pulse ap-
plied to the EXTERNAL TRIGGER INPUT. At the completion
of the current value modification (each digit) the Model 224
outputs a pulse that has the specifications shown in Figure
2-5. This pulse can be used to trigger another instrument
(printer, DMM, controller, etc.1 to start its programmed task.
With the Model 2243 IEEE-488 interface option installed, the
Model 224 can be used with any measurement system that
uses ?he IEEE-488 bus. For detailed operating instructions of
the Model 2243 IEEE-488 interface option, refer to the Model
2243 Instruction Manual
1.2 FEATURES
The Model 224 has several convenient and easy to use
features some of which are listed below.
@Selectable voltage compliance allows the user to select the
required voltage compliance.
04% digit display with appropriate exponent and decimal
point.
@The output current value can be modified either manually or
automatically.
*OPERATE button that places the display value of current at
the output connector on the rear panel. When not in operate
the Model 224’s output is set at O.OOO-6A while the display
remains the same.
@Data keys that allow the entry of numerical data onto the
display.
*External trigger input that when activated by the appropriate
signal instructs the Model 224 to increment or decrement
the displayed value of output current.
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External trigger output places an output pulse at the external
trigger output connector upon completion of the increment
or decrement of the displayed current value.
@Guard terminal that allows guarded applications to be com-
pleted.
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Selectable auto rate (TIME) of 50msec to 999.9sec.
aCANCEL button that momentarily blanks the display and
terminates the data modifying operation.
*I-LIMIT function that limits the output current between the
user programmed HI and LO current limits.
@IEEE-488 interface option allows the Model 224 to be incor-
porated into any system that uses programmed control
through the IEEE-488 bus.
1.3 WARRANTY INFORnhATlON
Warranty information is provided on the inside front cover of
this manual. If there is a need to exercise the warranty, con-
tact the Keithley representative in your area to determine the
proper action to be taken, Keithley Instruments maintains
complete repair and calibration facilities in the United States,
United Kingdom and Europe. Information concerning the ap-
plication, operation or service of your instrument should be
directed to the applications engineer in your area. Refer to the
inside front cover for address locations.
1.4 MANUAL ADDENDA
Improvements or changes to this manual will be explained on
an addendum sheet included with this manual.
1.5 SAFETY SYMBOLS AND TERMS
Safety symbols used throughout this manual are as follows:
The symbol !
A
on the instrument denotes that the user
should refer to the operating instructions.
The symbol
AM
on the instrument denotes that high
voltage may be present on the output terminals.
The WARNING used in this manual explains dangers that
could result in personal injury or death.
The CAUTION used in this manual explains hazards that
could damage the instrument.
1.6 UNPACKING AND INSPECTION
The Model 224 is inspected both mechanically and electrically
before shipment. Upon receiving the Model 224 unpack all
items from the shipping container and check for any obvious
signs of damage that may have occurred during transit.
Report any damage to the shipping agent. Retain and use the
original packaging materials if reshipment is necessary. The
following items are shipped with all Model 224 orders:
Model 224 Programmable Current Source
Model 224 Instruction Manual
Model 6011 Triaxial Test Lead Set
Optional accessories as ordered.
If an additional instruction manual is required, order the
manual package (Keithley Part Number 224-901-00). The
manual package includes an instruction manual and all perti-
nent addenda.
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