In the field of electronic test and measurement, whether a single instrument can simultaneously deliver precision source output and high-accuracy measurement has always been a focal point for engineers. The Keithley 2400 Series SourceMeter integrates a precision power supply, a 6½-digit digital multimeter, a current source, a voltage source, and an electronic load into a single unit, redefining the boundaries of DC parametric testing. Since its introduction in 1996, it has become the undisputed industry benchmark in the field of I-V characteristic testing.

1. The Ultimate All-in-One: One Instrument, Five Functions

In traditional test setups, performing voltage sourcing, current sourcing, voltage measurement, current measurement, and resistance measurement often required assembling multiple instruments, which not only occupied considerable space but also presented complex synchronization and connectivity challenges. The Keithley 2400 SourceMeter fundamentally changed this situation—it perfectly integrates the functions of these five instruments into a single half-rack-sized device.

Each 2400 SourceMeter consists of a high-stability, low-noise precision DC power supply and a true instrument-grade 5½-digit multifunction meter, forming a compact single-channel DC parametric tester. This tight coupling of "source" and "meter" not only greatly shortens the time required to develop, set up, and maintain test stations and reduces the overall system procurement cost, but also fundamentally eliminates the synchronization problems and connection complexity between multiple instruments.

2. Core Technical Advantages: Accuracy, Range, and Speed

1. Ultra-High Accuracy: 6½-Digit Resolution, 0.012% Basic Accuracy

The Keithley 2400 is renowned for its 0.012% basic measurement accuracy and 6½-digit resolution. With voltage resolution down to 1 μV and current resolution as low as 10 pA, it demonstrates unparalleled accuracy advantages in low-signal test scenarios such as semiconductor device characterization and materials science. Its low-noise characteristics (typical temperature drift coefficient of 0.01%/°C) make it particularly outstanding in long-term stability testing and variable-temperature experiments.

2. Wide Dynamic Range: 10 pA to 10 A, 1 μV to 1100 V

The 2400 series provides a current range covering 10 pA to 10 A and a voltage range covering 1 μV to 1100 V. Whether measuring faint leakage currents down to the picoamp level or driving load currents up to the ampere level, it handles both with ease. DC output power covers 20 W to 1000 W, with pulse power reaching up to 1000 W, meeting diverse testing needs from low-level devices to high-power modules.

3. Four-Quadrant Operation: Bidirectional Source and Sink Capability

All 2400 series SourceMeters support four-quadrant operation. Operating in the 1st and 3rd quadrants, the instrument acts as a power source delivering power to a load; operating in the 2nd and 4th quadrants, it acts as a "sink" absorbing energy. This means the instrument can not only supply power to a load but also simulate a load absorbing power—voltage, current, and resistance can all be measured synchronously during either source or sink operation, making it ideal for I-V characteristic sweeps of devices such as diodes, transistors, solar cells, and LEDs.

4. High-Speed Automation: 1700 Readings/Second with Comprehensive Interface Support

At 4½-digit resolution, the 2400 achieves data acquisition speeds of up to 1700 readings/second via the GPIB interface. Combined with the built-in pass/fail test comparator and programmable digital I/O ports, it can quickly implement production-line automatic sorting and robot-arm control. The instrument supports multiple communication interfaces, including GPIB, RS-232, USB, and Keithley Trigger Link. The SCPI standard command set facilitates integration into automated test systems, and when paired with the Keithley LabTracer 2.0 I-V curve tracing software, graphical analysis and data management can be easily accomplished.

5. Comprehensive Protection and Fault-Tolerance Mechanisms

The 2400 has multiple built-in protection mechanisms. Users can set compliance limits for the current source or voltage source; when the readback value reaches the programmable compliance limit, the source is automatically clamped at that limit, effectively protecting the device under test from damage under abnormal conditions such as overloads and thermal runaway. In addition, the optional contact check function ensures good contact of the sense leads before testing, avoiding measurement errors caused by poor connections.

3. Wide Range of Application Scenarios: From Semiconductors to New Energy

With its high accuracy, wide measurement range, and multifunctional integration, the Keithley 2400 demonstrates outstanding application value across numerous industries.

Semiconductor device characterization: In transistor I-V characteristic testing, the 2400 can precisely control the voltage source (±200 V range) and current source (±1 A) to accurately plot the device's volt-ampere characteristic curve, helping researchers analyze key parameters such as threshold voltage and leakage current. Its high-accuracy current measurement capability (resolution down to 0.1 pA) makes it a powerful tool for semiconductor device research.

Electrical characterization of materials science: In conductivity testing of conductive thin films (such as ITO and graphene), the 2400 uses the four-point probe method or the Van der Pauw method to accurately measure voltage drops in microcurrent environments, and, combined with thickness data, calculates sheet resistance and conductivity. For low-conductivity polymer composites, its low-noise measurement capability can capture weak current signals and avoid errors.

Optoelectronic device testing: In solar cell testing, the 2400 can use a stable current source to simulate illumination conditions, monitor output voltage and current in real time, and calculate photoelectric conversion efficiency. For photodetectors, its nanosecond-level response speed can capture transient photoelectric response signals.

Battery and electrochemical evaluation: Through constant-current charge/discharge testing, the 2400 can precisely record a battery's open-circuit voltage, internal resistance, and capacity changes to evaluate cycle life. Combined with AC impedance spectroscopy analysis, it can provide signal excitation over a frequency range of 10 mHz to 1 MHz, helping to elucidate electrode kinetics and ion conduction mechanisms.

Passive component and circuit protection device testing: Suitable for leakage current, low-voltage/resistance, LIV, and IDDQ testing of devices such as resistor networks, transient suppression devices (TVS, MOVs), and fuses.

4. Selection Guide: The 2400 Series Product Matrix

The Keithley 2400 series offers a rich array of model configurations to meet different voltage, current, and power requirements:

Users can select the most suitable model from the above lineup based on the voltage, current, and power requirements of the device under test.

5. Comparison with Competitors: Why Choose the Keithley 2400

In the SourceMeter market, Keithley and Agilent (now Keysight) are the two major competitors. With its ultra-high accuracy of 0.012% and 6½-digit resolution, the Keithley 2400 holds an advantage in low-signal testing fields such as materials science and semiconductor devices. Its four-quadrant operation, fast sweep capability, and automated testing capability realized through Test Script Builder, together with its low-noise characteristics (typical value 0.01%/°C), have made it widely favored in research scenarios requiring long-term stability testing.

It is worth noting that the Keithley 2400 has deep accumulated expertise in optoelectronic testing and small-signal measurement. Its LabTracer 2.0 software can intuitively display I-V curves, and, combined with the GPIB interface, automated data acquisition can be achieved. If the primary considerations for your test requirements are high accuracy and stability, the Keithley 2400 is undoubtedly the best choice.