User`s guide

4 Agilent 16440A User’s Guide, Edition 5
User's Guide
Operation
Operation
The selector provides the automatic switching capability of the measurement
resource SMU or PGU connected to a DUT terminal. This is useful for performing
reliability testing (stress testing) of DUTs. For example, the selector can connect a
PGU to the DUT for forcing ac stress, then can switch and connect an SMU for
measuring dc characteristics.
The selector has the channels CH 1 and CH 2 which provide the following
conditions.
CH 1 All open (no connection), SMU on, PGU on, and PGU open
CH 2 All open (no connection), SMU on, and PGU on
The PGU open is available only for the CH 1, and is made by keeping the PGU side
mechanical relay close and opening the semiconductor relay. This is effective for
frequent switching applications such as endurance tests of flash memory because the
semiconductor relay is more durable than mechanical relays.
If you want to add two more channels for a total of four, you can order another
16440A, which is called the “selector expander”. The selector and selector expander
have identical circuits. The only difference is the channel naming. The selector has
CH 1 and CH 2, and the selector expander has CH 3 and CH 4.
• Controlling the selector by using the 4155/4156
Selector connections can be set by using the SMU/PG SELECTOR table on the
STRESS: CHANNEL DEFINITION screen. See the 4155/4156 Setup Screen
Reference manual.
The switching state specified in the STRESS column is automatically performed
during stressing. The switching state specified in the MEASURE column is
automatically performed during measurement.
For example, you can specify to connect the PGU to the DUT during stress, and
connect the SMU to the DUT during measurement. So, when you press the
Stress
key, the PGU is automatically connected to the DUT. And when you press a
measurement key, the SMU is automatically connected to the DUT.