Keithley 224 Current source
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Model:
224
Date:
1984
Category:
Group:
Description:
Programmable Current Source
Information
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: manually
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 applied
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
Manual type:
User Manual
Pages:
40
Size:
477.84 Kbytes (489304 Bytes)
Language:
english
Revision:
Manual ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2014 03 07
MD5:
6fafc31921aa96b21c4f6b61686d5b69
Downloads:
765
Information
Manual type:
Service and User Manual
Pages:
75
Size:
5.85 Mbytes (6130409 Bytes)
Language:
english
Revision:
Fifth Printing
Manual ID:
224-901-01
Date:
Quality:
Scanned document, all readable.
Upload date:
2012 05 20
MD5:
996e2d118d061fc1f450859969532625
Downloads:
1281
Information
Para. Title Page
SECTION 1 — GENERAL INFORMATION
1.1 Introduction ... 1-1
1.2 Features ... 1-1
1.3 Warranty Information ... 1-1
1.4 Manual Addenda ... 1-1
1.5 Safety Symbols and Terms ... 1-1
1.6 Unpacking and Inspection ... 1-1
1.7 Repacking for Shipment ... 1-2
1.8 Specifications ... 1-2
1.9 Accessories ... 1-2
SECTION 2 — OPERATION
2.1 Introduction ... 2-1
2.2 Preparation for Use ... 2-1
2.2.1 Correct Line Voltage ... 2-1
2.2.2 Power Up ... 2-1
2.2.3 Warm Up ... 2-1
2.3 Operating lnstructions ... 2-1
2.3.1 Environmental Conditions ... 2-1
2.3.2 Front Panel Controls ... 2-1
2.3.3 Rear Panel Description ... 2-1
2.3.4 Output Connector ... 2-6
2.3.5 Inductive Loads ... 2-6
2.3.6 Response Time ... 2-6
2.3.7 General Operating Procedure ... 2-6
2.3.8 Front Panel Messages ... 2-7
2.3.9 Examples of Operation ... 2-7
2.4 Applications ... 2-12
2.4.1 Calibration ... 2-12
2.4.2 Resistivity Measurements ... 2-12
2.4.3 Diode Characterization ... 2-13
2.4.4 Low Resistance “Lindeck” Measurements ... 2-14
2.5 Detailed Front Panel Controls Description ... 2-14
2.6 Detailed Rear Panel Description ... 2-l 5
SECTION 3 — PERFORMANCE VERIFICATION
3.1 Introduction ... 3-1
3.2 Environmental Conditions ... 3-1
3.3 Recommended Test Equipment ... 3-1
3.4 Initial Conditions ... 3-1
3.5 Performance Verification Procedure ... 3-1
3.5.1 100mA to 1mA Range Verification ... 3-1
3.5.2 100μA and 10μA Range Verification ... 3-2
SECTION 4 — THEORY OF OPERATION
4.1 Introduction ... 4-1
4.2 Block Diagrams ... 4-1
4.3 Power supply ... 4-1
4.4 Analog Board ... 4-1
4.5 Digital Board (Microcomputer) ... 4-2
Para.
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.7.1
5.7.2
5.7.3
5.7.4
5.8
5.8.1
6.1
6.2
6.3
6.4
6.5
Title Page
SECTION 5-MAINTENANCE
Introduction ... 5-l
FuseReplacement ... 5-l
LineVoltageSelection ... 5-1
Disassembly ... ~ ... 5-2
FanFilterMaintenance ... 5-2
Special Handling of Static Sensitive Devices ... 52
Calibration ... 5-4
RecommendedTestEquipment ... 5-4
Environmental Conditions. ... 5-4
Warmup.. ... 5-4
Calibration Adjustments ... 5-4
Troubleshooting ... 5-5
DigitalSelfTest ... 5-5
SECTION 6-REPLACEABLE PARTS
Introduction ... 6-l
PartsList ... 6-l
Orderinglnformation ... 6-l
FactoryService.. ... 6-l
Schematic Diagrams and Component Location Drawings ... 6-1