3-4 Keysight B1505A User’s Guide, Edition 12AccessoriesN1258A Module SelectorModule selector is used to switch the m easurement resource connected to the deviceunder 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 GNDUprotection adapter and the HPSMU protection adapter. The N1258A is used with aDUT interface such as your own test fixture and prober station, not theN1259A/N1265A.Front Panel1. Power indicatorThis 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 indicatorA green LED lights to indicate the present connection path of the moduleselector.See Figure 3-2 and Table 3-1 for the status indicator and the connection path.3. Outputa. Low Force and Sense output connectorsBNC connectors. Force and Sense must be extended to and connectedtogether at a low terminal of a device under test (DUT). Then use highcurrent cable with BNC(m) connector for Force, normal cable with BNC(m)connector for Sense, manipulators, and such.b. High Force and Sense output connectorsHV(jack) connectors. Force and Sense must be extended to and connectedtogether at a high terminal of the DUT.N1258AModule SelectorForce External RelayControl OutputSenseForceSenseOutput±3 kV MaxSense/ForceGuardCircuitCommonPower HPSMUOpen HCSMU HVSMUStatus8 115 9Sense/ForceHCSMUCircuitCommon±42V MaxHighLow321aa b b c
