In the electronic test and measurement industry, whether a single instrument can deliver both precision source output and high-accuracy measurement has always been a key focus for engineers. The Keithley 2400 Series SourceMeter® integrates a precision power supply, 6½-digit multimeter, current source, voltage source and electronic load in one unit, redefining the capability boundaries of DC parameter test instruments. Since its launch in 1996, it has become an undisputed industry benchmark in I-V characterization testing.

1. All-in-One Integration: One Instrument, Five Functions

In traditional test solutions, voltage source, current source, voltmeter, ammeter and resistance measurement often require multiple separate instruments. This not only takes up a lot of workspace, but also brings complex synchronization and connection challenges. Keithley 2400 SourceMeter fundamentally changes this situation – it perfectly integrates the functions of these five instruments into one half-rack sized unit.

Every Model 2400 SourceMeter combines a high-stability, low-noise precision DC power supply and a true instrument-grade 5½-digit multimeter into one compact single-channel DC parameter tester. This tight integration of "source" and "measurement" not only significantly reduces the time required for test station development, setup and maintenance, lowers the overall system procurement cost, but also fundamentally eliminates synchronization issues and connection complexity between multiple instruments.

II. Core Technical Advantages: Accuracy, Measurement Range and Speed

1. Ultra-high Accuracy: 6½-digit resolution, 0.012% basic accuracy

Keithley 2400 is well-known for its 0.012% basic measurement accuracy and 6½-digit resolution. Its voltage resolution can reach 1μV, and current resolution is as low as 10pA. It delivers unrivaled accuracy in low-signal testing applications such as semiconductor device characterization and materials science. Its low-noise characteristic, with a typical temperature drift coefficient of 0.01%/℃, enables it to deliver outstanding performance in long-term stability tests and temperature-varying experiments.

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

The 2400 Series provides a current range from 10 pA to 10 A and a voltage range from 1 μV to 1100 V. It can easily handle both measurement of weak leakage current as low as picoampere level and driving load current up to ampere level. The DC output power ranges from 20 W to 1000 W, and the pulse power can reach up to 1000 W, which can meet diverse test requirements from low-level devices to high-power modules.

3. Four-quadrant operation: Dual capability as source and sink

All Model 2400 Series SourceMeters support four-quadrant operation . When operating in quadrants 1 and 3, it acts as a source to output power to the load; when operating in quadrants 2 and 4, it acts as a sink to absorb energy. This means the instrument can not only supply power to the load, but also simulate a load to absorb power. It can synchronously measure voltage, current and resistance during both source and sink operation, making it perfectly suitable for I-V characteristic scanning of diodes, transistors, solar cells, LEDs and other devices .

4. High-speed Automation: 1700 readings/second, Comprehensive Interface Support

At 4½ digit resolution, the 2400 achieves a data acquisition speed of up to 1700 readings per second via the GPIB interface. Combined with the built-in pass/fail test comparator and programmable digital I/O port, it enables rapid automatic sorting on production lines and robotic manipulator 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 systems, and when paired with Keithley LabTracer 2.0 I-V curve tracing software, it enables easy graphical analysis and data management。

5. Complete Protection and Fault Tolerance Mechanism

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 threshold, the source will be automatically clamped at this limit, effectively protecting the device under test from damage under abnormal conditions such as overload 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 connection.

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

Keithley 2400 delivers excellent application value across many industries thanks to its high accuracy, wide measurement range and multi-function integration.

Semiconductor Device Characterization: In I-V characteristic testing of transistors, the 2400 can precisely control the voltage source (±200V range) and current source (±1A range), and accurately plot the I-V characteristic curve of the device, helping researchers analyze key parameters such as threshold voltage and leakage current. Its high-precision current measurement capability (with resolution up to 0.1pA) makes it a powerful tool for semiconductor device research.

Electrical Characterization in Materials Science:  When measuring the conductivity of conductive thin films such as ITO and graphene, the 2400 can accurately measure voltage drop in micro-current environments via the four-probe method or Van der Pauw method, then calculate sheet resistance and conductivity based on the thickness data. For low-conductivity polymer composite materials, its low-noise measurement capability can capture weak current signals and avoid measurement errors.

Optoelectronic Device Testing:  For solar cell testing, the 2400 can simulate illumination conditions via a stable current source, 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 tests, the 2400 can accurately record changes in open-circuit voltage, internal resistance and capacity of batteries, and evaluate cycle life. When combined with electrochemical impedance spectroscopy analysis, it can provide signal excitation in the frequency range from 10mHz to 1MHz, helping researchers analyze electrode kinetics and ion conduction mechanisms.

Testing of Passive Components and Circuit Protection Devices: It is suitable for leakage current, low voltage/resistance, LIV and IDDQ testing of components such as resistor networks, transient suppression devices (TVS, MOV), and fuses.

IV. Selection Guide: 2400 Series Product Portfolio

The Keithley 2400 Series offers a wide range of model configurations to meet different requirements for voltage, current and power :

Users can select the most suitable one from the models listed above based on the voltage, current and power requirements of your device under test.

5. Comparison with Competitors: Why Choose Keithley 2400

In the source measure unit (SMU) market, Keithley and Agilent (currently Keysight) are the two main competitors. The Keithley 2400 features an ultra-high accuracy of 0.012% and 6½ digit resolution, giving it a distinct advantage in low-signal testing applications such as material science and semiconductor devices. Its four-quadrant operation, fast scanning capability, automated testing enabled by Test Script Builder, combined with low noise performance (typical 0.01%/℃ temperature coefficient), make it widely favored in research scenarios that require long-term test stability.

It is worth mentioning that the Keithley 2400 has a profound accumulation in the fields of optoelectronic testing, small-signal measurement and other fields. The LabTracer 2.0 software it offers can visually display I-V curves, and automated data acquisition can be realized with the GPIB interface. If high accuracy and stability are the primary considerations for your testing requirements, the Keithley 2400 is undoubtedly the best choice.