For example: Agilent E4440A or Anritsu 68369
Keithley Instruments
Keithley Instruments 7703
32 Ch Hi Speed Differential Multiplexer

Category: Data Acquisition Systems
Keithley Instruments 7710
20 Ch Solid State/Long Life Differential Module

Category: Data Acquisition Systems
Keithley Instruments 7712
3.5GHz, Dual 1x4 50ohm Multiplexer Card

Category: Data Acquisition Systems
Keithley Instruments 7753
High Voltage Source/Switch Module

Category: Plug In / Part / Component / Module
Keithley Instruments 8501-2
Trigger Link Cable with Male Micro-DIN Connectors at each end, 1m (3.3 ft.)

Category: Accessory
Keithley Instruments KEI 7078-TRX-GND
3 Slot Male Triax to BNC Adapter (guard removed)

Category: Data Acquisition Systems
Keithley Instruments KUSB-488A
USB to GPIB Adapter Interface

Category: Plug In / Part / Component / Module
Keithley Instruments KUSB-488B
IEEE-488.2 USB-to-GPIB Interface Adapter for USB Port

Category: Plug In / Part / Component / Module
Keithley Instruments MIMO-TEST-SOLUTION
802.11n WLAN or 802.16e WiMAX MIMO Kit (2x2)

Category: Test Set
Keithley Instruments S40-Q009-12
Custom RF/Microwave Signal Routing System with up to 400 Switch Contacts

Category: Switching System