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Methods and apparatus disclosed and described herein have been developed solely on company
funds of Lake Shore Cryotronics, Inc. No government or other contractual support or relationship
whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore
Cryotronics, Inc. in these developments. Methods and apparatus disclosed herein may be subject
to U.S. Patents existing or applied for. Lake Shore Cryotronics, Inc. reserves the right to add,
improve, modify, or withdraw functions, design modifications, or products at any time without
notice. Lake Shore shall not be liable for errors contained herein or for incidental or consequential
damages in connection with furnishing, performance, or use of this material.
Rev. 1.2
User's Manual
Model 102
Lake Shore Cryotronics, Inc.
575 McCorkle Boulevard
Westerville, Ohio 43082-8888 USA
E-Mail Addresses:
sales@lakeshore.com
service@lakeshore.com
Internet Addresses:
www.lakeshore.com
Fax: (614) 891-1392
Telephone: (614) 891-2243
P/N 119-014
9 September 2002
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Summary of Contents for Lakeshore 102
- Page 1 User’s Manual Model 102 Current Source Lake Shore Cryotronics, Inc. 575 McCorkle Boulevard Westerville, Ohio 43082-8888 USA E-Mail Addresses: sales@lakeshore.com service@lakeshore.com Internet Addresses: www.lakeshore.com Fax: (614) 891-1392 Telephone: (614) 891-2243 Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics, Inc.
- Page 2 Lake Shore Model 102 User’s Manual LIMITED WARRANTY Lake Shore Cryotronics, Inc. (henceforth Lake Shore), the manufacturer, warrants this product to be free from defects in material and workmanship for a period of 12 months from the date of shipment. During the warranty period, under authorized return of...
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Page 3: Table Of Contents
Lake Shore Model 102 User’s Manual TABLE OF CONTENTS Chapter/Paragraph Title Page INTRODUCTION................1-1 General ..............1-1 Model 102 System Description........1-1 Handling Liquid Helium and Liquid Nitrogen ....1-3 1.2.1 Handling Cryogenic Storage Dewars...... 1-3 1.2.2 LHe and LN Safety Precautions ...... -
Page 4: List Of Tables
Lake Shore Model 102 User’s Manual LIST OF ILLUSTRATIONS Figure No. Title Page Typical Cryogenic Storage Dewar ..........1-3 Model 102 Front Panel ............. 3-2 Typical Model 102 Application ..........3-2 Model 102 PCB Layout............. 4-2 LIST OF TABLES Table No. -
Page 5: Introduction
1 µA and 1 mA by changing a resistor inside the instrument. The Model 102 has a compliance voltage of 8 Volts, allowing it to be used as an excitation source in a variety of diode sensor applications. A compliance LED visually indicates unit operation within specification. - Page 6 Lake Shore Model 102 User’s Manual Table 1-1. Model 102 Specifications Output Current: 10 µA factory set; internally programmable from 1 µA to 1 mA. Accuracy: 0.05% of output at 10 µA Temperature Coefficient: 0.005% per °C Compliance Voltage: 8 volts AC Current Ripple: Less than 0.01% of scale +1 nA (RMS) in a...
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Page 7: Handling Liquid Helium And Liquid Nitrogen
Helium and Nitrogen are colorless, odorless, and tasteless gases. They liquefy when properly cooled. Liquid Helium (LHe) and liquid nitrogen (LN may be used in conjunction with the Model 102. Although not explosive, there are certain safety considerations in the handling of LHe and LN 1.2.1... -
Page 8: Recommended First Aid
Lake Shore Model 102 User’s Manual When transferring LHe and LN , protect eyes and skin from accidental contact with liquid or the cold gas issuing from it. Protect eyes with full face shield or chemical splash goggles; safety glasses (even with side shields) are inadequate. -
Page 9: Identifying Esds Components
Lake Shore Model 102 User’s Manual 1.3.1 Identifying ESDS Components Below are some industry symbols used to label components as ESDS: 1.3.2 Handling ESDS Components Observe all precautions necessary to prevent damage to ESDS components before installation. Bring the device and everything that contacts it to ground potential by providing a conductive surface and discharge paths. -
Page 10: Safety Symbols
Lake Shore Model 102 User’s Manual Do Not Operate In An Explosive Atmosphere Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard. -
Page 11: Installation
(immediately behind the title page). REPACKAGING FOR SHIPMENT To return the Model 102 or accessories for repair or replacement, obtain a Return Goods Authorization (RGA) number from Technical Service in the United States, or from the authorized sales/service representative from which the product was purchased. -
Page 12: Power And Ground Requirements
Lake Shore Model 102 User’s Manual POWER AND GROUND REQUIREMENTS The Model 102 requires a power source of 90 to 125 or 200 to 250 VAC, 50 or 60 Hz, single phase. The proper wall mounted AC power adapter ships with the Model 102. -
Page 13: Sensor Mounting
Lake Shore Model 102 User’s Manual Thermally anchor lead wires at several temperatures between room temperature and cryogenic temperatures to guarantee no heat conduction through the leads to the sensor. 2.4.2 Sensor Mounting DT-470-SD Before installing a diode sensor, identify... -
Page 14: Measurement Errors Due To Ac Noise
Lake Shore Model 102 User’s Manual 2.4.3 Measurement Errors Due To AC Noise Poorly shielded leads or improperly grounded measurement systems can introduce AC noise into the sensor leads. In diode sensors, the AC noise shifts the DC voltage measurement due to the diode non-linear current/voltage characteristics. -
Page 15: Operation
The polarity of the terminals is marked on the front panel. OPERATIONAL NOTES 1. Although the Model 102 is factory preset for current output of 10-µA, it is actually “programmable” to any value between 1 µA and 1 mA. See Paragraph 4.1. -
Page 16: Model 102 Front Panel
Lake Shore Model 102 User’s Manual P-102-3-1.bmp Figure 3-1. Model 102 Front Panel Model 102 Current Source Digital Voltmeter (Not Supplied) Wall-Mount AC Transformer CAUTION Indoor Use Only Double Banana Jacks DVM Cable (Not Supplied) Sensor (Not Supplied) C-102-3-2.eps Figure 3-2. Typical Model 102 Application... -
Page 17: Service
Calibration in Paragraph 4.2. OUTPUT CURRENT REPROGRAMMING Although the Model 102 is factory preset for a current output of 10 µA, users may set it to any value between 1 µA and 1 mA. The equation used to determine the value of the new programming resistor is: program Use the following procedure to change the programming resistor. -
Page 18: Model 102 Pcb Layout
DMM LO terminal to the –CURRENT OUTPUT terminal. 4. Select DC Amperes on the DMM. 5. Adjust the CURRENT ADJ trimpot on the Model 102 circuit board until the DMM reads 10.000 µA NOTE: If output current has been reprogrammed to another value, adjust to that value. - Page 19 4. Connect the DMM HI terminal to the +CURRENT OUTPUT terminal, and the DMM LO terminal to the –CURRENT OUTPUT terminal. 5. Select DC Voltage on the DMM. 6. Adjust CURRENT ADJ trimpot on Model 102 circuit board until DMM reads a voltage equal to: = (desired current) × (load resistance) load For example, if the desired current is 10 µA and the load resistor...
- Page 20 Lake Shore Model 102 User’s Manual This Page Intentionally Left Blank Service...
- Page 21 NOTES...
- Page 22 Lake Shore is a technology leader in the development of cryogenic temperature sensors, precision low temperature measurement and control instrumentation, and magnetic measurement and test systems. Since 1968, Lake Shore physicists, material scientists, and engineers have dedicated themselves to the development of tomorrow’s technology today.