User`s guide

8-26 Agilent 4155C/4156C User’s Guide Vol.2, Edition 6
Support Functions
SMU/PG Selector Control
Setup and Switching Conditions
Setup of the SMU/PG SELECTOR field and switching conditions are explained
below:
CH1 (or CH3 for second selector):
CH2 (or CH4 for second selector):
NOTE SW1 and SW2 are mechanical relays, and SW3 is a semiconductor switch. Leakage
current and stray capacitance of SW1 and SW2 are less than for SW3. However, the
switching speed of SW3 is faster and life is longer than SW1 and SW2.
If you need to switch PGU many times, use PGU OPEN, not OPEN to disconnect
PGU.
Restrictions using Selector
• 41501A/B Expander equipped with PGU must be connected to 4155C/4156C.
• Kelvin connection is not available.
Setup SW1 SW2 SW3 Description
SMU ON OFF OFF Connects SMU.
PGU OFF ON ON Connects PGU.
PGU OPEN OFF ON OFF Open. Disconnected.
OPEN OFF OFF OFF Open. Disconnected.
Setup SW1 SW2 Description
SMU ON OFF Connects SMU.
PGU OFF ON Connects PGU.
OPEN OFF OFF Open. Disconnected.