
2-66 Agilent B1500A/B1505A Programming Guide, Edition 11
Remote Mode Functions
SMU/PG Selector
SMU/PG Selector
The Agilent 16440A SMU/PGU Selector (B1500A-A04) is used to switch the
measurement resources connected to DUT (device under test). The Input ports must
be connected to the measurement resources, an SMU and an SPGU or others, and
the Output port must be connected to the DUT interface. For the SMU connection,
connect the Force terminal only. The Sense terminal must be open.
Use the ERMOD and ERSSP commands to control the 16440A selector. The
ERMOD command sets the Digital IO control mode. The ERSSP command sets the
selector channel CH 1 or CH 2 input-output path to the SMU connect, PGU connect,
or open (no connection).
Figure 2-39 SMU/PG Selector Block Diagram and Connections
The selector CH 1 additionally provides the PGU open status which is made by
keeping the PGU side mechanical relay close and opening the semiconductor relay.
This is effective for applications requiring frequent PGU open/connect switching
because a semiconductor relay is durable compared to a mechanical relay.
The B1500A can use up to two selectors by connecting the selector control cable
between the CONTROL Output connector of the first selector and the CONTROL
Input connector of the second selector.
AC power
16440A Selector #2 for DUT terminals 3 and 4
B1500A Digital I/O
DUT terminal 1
SMU #1 Force
PGU #1 or others
DUT terminal 2
SMU #2 Force
PGU #2 or others
16445A Selector Adapter
16440A Selector #1
Output
SMU Input
PGU Input
Output
SMU Input
PGU Input
16440A Selector
2
Mechanical relay
Semiconductor relay
1
2
CONTROL
Input
Output
CONTROL
Input
Output
CONTROL
Input
Output
1
1
1
1
Input
Output
Input
Input
Output
Input
CH 1
CH 2
CH 1
CH 2
CH 1
CH 2
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