Keysight B1505A Configuration and Connection Guide 5-27
Connection Guide for Wafer Prober and Your Own Test Fixture
To Connect Module Selector
To Connect Module Selector
Keysight N1258A module selector is used to switch the measurement resource connected
to the device under test (DUT) automatically. The measurement resource will be
HP/MPSMU, HVSMU/HVMCU, or HC/DHCSMU. One selector provides one switching
channel. Also the selector has built-in GNDU protection adapter, built-in HPSMU
protection adapter, and built-in HCSMU Kelvin adapter.
The N1258A should be installed near your DUT interface as shown in Table 5-3 on page
5-7. Also see figures 5-11 and 5-12.
The output cable connection is effective for all measurement performed by the modules
connected to the Input terminals. Connection change is not required. The module selector
switching status is indicated by the Status indicator mounted on the front panel. See Table
5-22 on page 5-31.
Figure 5-10 Module Selector Circuit Diagram and Connections
CAUTION The GNDU can sink current of up to 4.2 A. Use 16493L GNDU cable to connect the
GNDU to the N1258A.
Do not use normal triaxial cable (16494A) because the maximum current rating of the
cable is 1 A.
CAUTION Maximum current must be ± 30 A to prevent the module selector from performance
degradation and failure.
NOTE Using Dual HCSMU (DHCSMU)
DHCSMU can be configured by two HCSMU modules installed in one B1505A and
connected to the 16493S-021 Dual HCSMU combination adapter. See "To Connect Dual
HCSMU Adapter" for connection. The output connectors are compatible with HCSMU.
Front view
DUT high terminal
DUT high
HPSMU
DUT low
Module Selector
Open
High
HVSMU
HCSMU
GNDU
Low
AC power
B1505A Digital I/O
HCSMU Force+Sense
HPSMU Force+Sense
GNDU Force+Sense
HVSMU Force
Rear view
DUT low terminal
Open
100 kW
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