Keithley 238 High Current Source Measure Unit

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Manufactured by: Keithley

Category: SourceMeters

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Keithley 238 Source Measure Unit

The Keithley 238 Source Measure Unit is a state-of-the-art, fully programmable instrument designed to source and measure voltage or current simultaneously, making it an essential tool for testing and characterizing semiconductor devices, materials, and systems. This innovative device combines four instruments in one: voltage source, current source, voltage measure unit, and current measure unit, allowing for versatile applications in research and industrial environments.

Key Features and Specifications

    • SOURCE MEASURE UNIT: Provides the flexibility to source voltage while measuring current, or alternatively, source current while measuring voltage, streamlining various testing scenarios.
    • FUNCTION: Operates as a DC source or meter, sweep source, or a comprehensive source-measure unit, offering a wide range of applications.
    • SOURCE-DELAY-MEASURE CYCLE: Includes a fixed default delay for instrument settling, with the option for user-defined delays to accommodate the characteristics of the device under test or system capacitance.
    • MEASURE: Features rapid integration times, with 416 µs for 4-digit resolution, 4 ms for 5-digit resolution in medium mode, and line cycle measurement capabilities of 16.67 ms (60 Hz) or 20.00 ms (50 Hz) at 5-digit resolution. The elapsed time function allows for precise tracking of measurement durations during sweeps.
    • RANGING: Auto-ranging is available through keypad entry, with fixed range selection possible using a rotary dial and SELECT keys. This device is fully programmable in SWEEP function, with both auto and fixed range measurement options tailored via compliance values.
    • FILTER: The Keithley 238 can average multiple measurements (selectable n = 2, 4, 8, 16, or 32), providing more accurate readings by minimizing noise.
    • SUPPRESS: This function allows users to subtract a displayed measurement from all subsequent readings, enhancing measurement flexibility.
    • MENU: Features a comprehensive menu for settings like DC Measurement Delay, Default Delay On/Off, Local/Remote Sense, 50/60Hz settings, IEEE Addressing, and Self Tests. Data entry is facilitated with an easy-to-use numeric keypad or a detented rotary dial.
    • TRIGGER: Offers configurable input and output settings for triggering any phase of the SOURCE-DELAY-MEASURE sequence, including an internal trigger, external options via the front panel MANUAL TRIGGER button, and IEEE-488 bus compatibility.
    • MEMORY: The device can store one full sweep (up to 1000 points) of source, delay, and measure values, including elapsed times and sweep parameters, with reliable lithium battery backup for data retention.
    • INTERLOCK: Designed for safe operation in conjunction with test fixtures or external switches, featuring a normally closed interlock that puts the instrument in standby mode when opened.

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