SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
The Model 220 is a programmable current source with full
range current from 2nA to 100mA. The Model 220 has a
selectable voltage compliance of up to 105V in one volt in-
crements. The 100 memory locations allow up to 100
storage points for programming source, V-limit, end dwell
time. The Model 220 can be used with any measurement
system that uses the IEEE-488 interface bus. For detailed
operating instructions of the Model 220 end the IEEE-488
bus, refer to the Model 220/230 Programming Manual.
1.2 FEATURES
The Model 220 includes the following features:
100 point buffer that is capable of storing up to 100 points
of an output waveform.
Programmable dwell time between the data points in the
buffer when used in the single or continuous program
modes.
Input end output connections for external triggering
located on the rear panel.
Selectable voltage compliance allows operator to select
the required voltage compliance.
4% digit display with appropriate exponent and decimal
point.
Program modes that control the sequence between the
buffer points. This is for either single, step or continuous
sequencing.
Data keyboard to enter data (V-limit, dwell time, source,
etc.1 into the buffer.
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Program control that has a start, stop end reset control
for the buffer end program mode.
. OPERATE button that holds the source in standby until
programmed into operate.
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IEEE-488 interface bus operation isstandard. Thisenables
the Model 220 to be incorporated into a system that uses
programmed control through the IEEE-488 bus.
1.3 WARRANTY INFORMATION
Warranty information is provided on the inside front cover
of this manual. If there is a need to exercise the warranty,
contact the Keithley representative in your area to deter-
mine the proper action to be taken. Keithley maintains corn-
plete repair and calibration facilities in the United States,
West Germany, Great Britain, France, the Netherlands,
Switzerland end Austria. Information concerning the appli-
cation, operation or service of your instrument may be
directed to the applications engineer et any of the above
locations. Check the inside front cover of this manual for
addresses.
1.4 MANUAL ADDENDA
Improvements or changes to this manual will be explained
on en addendum included with this manual.
1.5 SAFETY SYMBOLS AND TERMS
Safety symbols used in
this manual are as follows:
The symbol
A
on the instrument denotes that
the user should refer to the operating instructions.
The symbol
on the instrument denotes that
1OOOV or more may be present on the terminal(s).
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 220 is inspected both mechanically and elec-
trically before shipment. Upon receiving the Model 220
unpack all items from the shipping container and check for
any obvious damage that may have occurred during transit.
Report any damage to the shipping agent. Retain end use
the original packaging materials if reshipment is necessav.
The following items are shipped with all Model 220 orders:
*Model 220 Programmable Current Source
*Model 220 Instruction Manual
*Model 6011 Triaxial Test Lead
*Model 220/230 Programming Manual
*Optional accessories per request.
1.7 REPACKAGING FOR SHIPMENT
The Model 220 should be packed in its original carton using
the packaging method shown in Figure l-l. Before pack-
aging, wrap the instrument in plastic. After it is placed in the
box, surround the instrument with Styrofoam packaging
material.
If the Model 220 is to be returned to Keithley Instruments
for calibration or repair, include the following:
*ATTENTION REPAIR DEPARTMENT on the address label.
*Warranty status of the instrument.
*Completed service form.
1.8 SPECIFICATIONS
For Model 220 detailed specifications, refer to the specifica-
tions that precede this section.
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