Lake Shore Cryotronics 121, Руководство пользователя

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2 CHAPTER 1: Introduction
1.2 Applications
The Model 121 current source is ideally suited for testing, measuring,
and operating resistive and semiconductor devices, such as:
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Lake Shore Cernox™ temperature sensors
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Other resistance temperature detectors (RTDs) such as platinum
sensors
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Diode temperature sensors, including Lake Shore DT-670’s
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LED devices
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Hall sensors used for magnetic field measurement
An accurate, stable source of current is key to ensuring consistent opera-
tion of these devices, where the voltage drop across the device can be
dependent upon temperature, magnetic field, and other parameters.
The instrument's wide output range is of great value when used with
RTD-type sensors whose resistance can vary with temperature by as
much as 6 orders of magnitude. The current reversal feature enables
compensation for thermal EMF, important for accurately measuring
resistors at very low excitation levels.
Example applications include:
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Basic device QC ("good/bad" verification)
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LED brightness testing (constant device current)
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Temperature sensor calibration (determine resistance at fixed cali-
bration points)
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Temperature measurement (using a voltmeter readout)
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Magnetic sensor calibration and measurement
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Semiconductor device measurements (IV curves for diodes, transis-
tors, etc.)
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Circuit prototyping (fixed current source)
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Small scale electro-chemical applications
Whether operating over a wide range of environmental conditions,
establishing precise sensor calibrations or simply testing devices for
conformance, the Model 121 provides a convenient and reliable alterna-
tive to simple voltage-based circuits, and a very affordable alternative to
more expensive multi-function current sources. It can be readily inte-
grated into automated test systems using its built-in USB computer
interface and offers a highly readable, simple-to-use operator display.