Source Measure Units Buying Guide

Selecting the right source measure unit (SMU) depends on the accuracy, speed, and performance your application demands. Keysight offers three performance grades of SMUs — Essential, Expert, and Pro. This buying guide compares these grades and their specifications. Whether you are performing general-purpose device characterization, precision IV measurements, or high-speed transient analysis, each SMU grade offers a unique combination of source resolution, minimum current measurement resolution, channels, pulse current, maximum voltage, and maximum current.
 

Keysight’s SMU lineup is structured into three main performance grades with varying core features:

• Essential SMUs come in one class, the SM1-class, and include the B2910CL and B2901CL. Affordable and compact, Essential SMUs combine 6-instruments-in-1 and 5.5-digit source resolution, making them ideal for applications including device characterization, circuit testing, and educational use.
  
  
• Expert SMUs come in one class, the SM2-class, and include the B2902C and B2901C. For parallel IV measurements and power electronics testing in semiconductor and next-generation material applications, Expert SMUs provide 7-instruments-in-1 functionality, pulsed measurement capabilities, single- and dual-channel configurations, and a sampling rate of 50 kSa/s.
  
  
• Pro SMUs come in one class, the SM3-class, and include the B2912C and B2911C. For high-speed transient analysis and accurate real-world simulation, Pro SMUs offer ultra-high precision, double the sampling rate of Expert SMUs, and 6.5-digit source resolution, designed for testing power-intensive devices in R&D, power electronics, and nanomaterials research.
   

Typical use cases further illustrate how each SMU grade supports different engineering needs:

• Essential SMUs are ideal for everyday device characterization, circuit testing, and academic labs, simplifying test tasks while providing reliable, cost-effective performance.
  
  
• Expert SMUs expand testing capability with pulsed output, dual channels, and deeper memory, making them well-suited for more demanding applications such as semiconductor and next-generation materials testing.
  
  
• Pro SMUs are our highest-performance models, ideal for applications requiring ultra‑high‑precision measurements, high‑speed transient analysis, and ultra-fast sampling. Used in cutting-edge labs, Pro SMUs capture the highest measurement accuracy when simulating real-world conditions for testing power-intensive devices in next-generation R&D, power electronics, and nanomaterial research.
   

Keysight also offers modular source measure units that deliver the performance of a benchtop SMU in a compact PXIe form factor, ideal for saving space while scaling test capacity. Modular SMUs offer flexible channel configurations, fast sampling, and precision sourcing, making them well-suited for both R&D and high-volume production environments. Mix and match modules with varying performance and capabilities to tailor the modular SMU to your needs.
 

Keysight SMU software provides an intuitive and powerful interface for controlling and automating SMU operations. It enables you to quickly set up tests, visualize results, and analyze data with precision. Track and record your source output to understand the impact of the power draw for specific events. Explore the wide variety of control, automation, and application-specific software for Keysight source measure units. Perform precision IV sweeps, emulate battery behavior, and analyze power consumption with intuitive, high-performance tools.
 

Before finalizing a source measure unit purchase, it’s important to consider key selection factors:

• Source resolution: Impacts the precision of your voltage and current sourcing. Select Essential or Expert models for 5.5-digit resolution for general-purpose use or select Pro for 6.5-digit resolution when maximum accuracy and stability are required, especially when working with low-level signals.
  
  
• Current measurement sensitivity: Indicates how effectively you can measure small currents. Choose Essential for sensitivity from 1 pA to 10 fA for general testing, Expert for 100 fA sensitivity for semiconductor and materials testing, and Pro for 10 fA sensitivity when precise, repeatable results for low-leakage devices or next-generation applications are required.
  
  
• Channel count: Defines how many outputs or devices that you can test in parallel. Choose Essential (1 channel) for simple sourcing and measurement tasks, Expert (1 – 2 channels) for dual-device comparison or two-path testing, and Pro (1 – 2 channels) for high-performance, synchronized operation in demanding setups.
  
  
• Pulse output capability: Pulsed sourcing protects sensitive devices and reduces thermal effects. Choose Essential if you do not need this pulsed outputs. Select Expert or Pro for built-in pulsed output and control if your application includes high-speed device switching, thermal management, or energy-limited components.
  
  
• Sampling rate: Enables faster, more precise measurements, critical for capturing transient events. Choose Essential (up to 20 kSa/s) to manage slower, steady-state measurements, Expert (up to 50 kSa/s) for enhanced sampling rates to support transient analysis, and Pro (up to 100 kSa/s) for double the sampling rate of Expert for high-speed transients and demanding dynamic testing.
  
  
• Sampling interval: Enables finer time resolution for capturing rapid changes in device behavior. Choose Essential (50 μs to 200 μs) for slow-changing signals where precision timing is less critical, Expert (20 μs) for more detailed transient analysis such as device switching and signal integrity measurements, and Pro (10 μs) for high-speed real-time transient capture, dynamic device characterization, and fast signal monitoring.
   

Keysight SMUs deliver high accuracy and precision, ultra-fast sampling, integrated functionality, and pule output measurements needed for accurate electronic testing – from early design to next-generation R&D. They are backed by Keysight Support Services, including calibration, repair, KeysightCare, educational resources, and Keysight Support to reduce your learning curve, enhance your uptime, and ensure the accuracy of your testing equipment.