3-4 Keysight B1505A User’s Guide, Edition 12
Accessories
N1258A Module Selector
Module selector is used to switch the measurement resource connected to the device
under test (DUT) automatically. The measurement resource will be GNDU,
HPSMU/MPSMU, HCSMU/DHCSMU (Dual HCSMU), or HVSMU/HVMCU.
One selector provides one switching channel. Also the selector installs the GNDU
protection adapter and the HPSMU protection adapter. The N1258A is used with a
DUT interface such as your own test fixture and prober station, not the
N1259A/N1265A.
Front Panel
1. Power indicator
This LED turns yellow when the AC power is applied to the module selector.
This LED turns green when the module selector is ready to use.
2. Status indicator
A green LED lights to indicate the present connection path of the module
selector.
See Figure 3-2 and Table 3-1 for the status indicator and the connection path.
3. Output
a. Low Force and Sense output connectors
BNC connectors. Force and Sense must be extended to and connected
together at a low terminal of a device under test (DUT). Then use high
current cable with BNC(m) connector for Force, normal cable with BNC(m)
connector for Sense, manipulators, and such.
b. High Force and Sense output connectors
HV(jack) connectors. Force and Sense must be extended to and connected
together at a high terminal of the DUT.
N1258A
Module Selector
Force External Relay
Control Output
Sense
ForceSense
Output
±3 kV Max
Sense/Force
Guard
Circuit
Common
Power
HPSMU
Open
HCSMU HVSMU
Status
81
15
9
Sense/Force
HCSMU
Circuit
Common
±42V Max
HighLow
3
2
1
a
a
b
b
c
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