User`s guide

Agilent 4155C/4156C User’s Guide Vol.2, Edition 6 7-3
Measurement Units and Functions
Measurement Units
Measurement Units
The 4155C/4156C and 41501A/B have the measurement units listed below. This
section explains source and measurement functions of the measurement units.
• “GNDU - Ground Unit”
• “SMU - Source Monitor Unit”
• “VSU - Voltage Source Unit”
• “VMU - Voltage Monitor Unit”
• “PGU - Pulse Generator Unit”
GNDU - Ground Unit
GNDU is a 0 V constant voltage source, and used for the reference of the
measurement ground. Also GNDU can sink up to ±1.6 A, so it is effective for using
the HPSMU (high power SMU). Figure 7-1 shows a simplified circuit diagram of
GNDU.
The GNDU is installed in the 41501A/B Expander.
Figure 7-1 Simplified GNDU Circuit Diagram