Agilent 4155B/4156B User’s Guide Vol.2, Edition 5 1-5
Measurement Units
Source/Monitor Unit (SMU)
Three types of SMUs are available:
• HRSMU (high resolution SMU)
• Force and measure: up to ±100 V or ±100 mA.
• Maximum output power: 2 W.
• Minimum current measurement range: 10 pA with 1 fA resolution.
• Only the 4156B has HRSMUs. The 4156B has four HRSMUs.
• MPSMU (medium power SMU)
• Force and measure: up to ±100 V or ±100 mA.
• Maximum output power: 2 W.
• The 4155B has four MPSMUs, and the 41501A/B can be equipped with
either two MPSMUs or one HPSMU.
• HPSMU (high power SMU)
• Force and measure: up to ±200 V or ±1 A.
• Maximum output power: 20 W.
• Only the 41501A/B has HPSMU. The 41501A/B can be equipped with
either two MPSMUs or one HPSMU.
HPSMUs and HRSMUs can be connected to test devices by Kelvin connection.
Each SMU has a compliance feature that limits output voltage or current to prevent
damage to your devices. When the SMU forces voltage, you can specify I
compliance. When the SMU forces current, you can specify V compliance.
For details about the compliance setting range and resolution, see “Compliance” in
Chapter 3.
The following figures and tables show the output and measurement ranges of each
SMU type.
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