Microwave switches and attenuators are connected to the 34945A configuration through distribution boards (Y1150A - Y1155A; sold separately) installed on the 34945EXT module.

The 34945EXT is divided into four banks organized by channel number. Any distribution board may be installed in any bank, and multiple distribution boards of the same type may be installed on the same 34945EXT module. Distribution boards can be installed or removed with the 34945A turned on; however, the channel drive source must be off.

The “I/O ACCESS” LED on the EXT module indicates communication sequences between the 34945A and the 34945EXT.

The Y1150A-Y1155A distribution boards enable simple connections to the external switches. The distribution boards plug onto the 34945EXT and are used to route the power and control signals from the driver module to the switches using standard cables.

There are five distribution boards (Y1150A – Y1154A) designed to allow Keysight’s most popular switches and attenuators to be driven directly. A sixth distribution board, the Y1155A, is designed to drive virtually any switch or attenuator by providing screw terminals to connect to relay coils and position indicators.

The Y115x distribution boards are passive; they only provide socket headers or screw terminals that interface external devices to the 34945EXT. The distribution boards do provide access to position feedback signals that can be used to drive LED’s to visually represent a signal path, for example.

Distribution boards

• Y1150A - for 8 N181x SPDT Switches
• Y1151A - for two 87104x/106x L7x0xx Multiport or 87406B Matrix Switches
• Y1152A - for One 87204x/206x or 87606B Switch and Two N181x Switches
• Y1153A - for Two 84904/5/6/7/8 or 8494/5/6 Step Attenuators
• Y1154A - for Two 87222, L7222C Transfer Switches and Six N181x SPDT Switches
• Y1155A - with Generic Screw Terminals for Driving 16 Switch Coils

Cables

• Y1157A - 9 to 10-pin Cable Kit for Y1150A, Y1152A, Y1154A
• Y1158A - 10 to 10-pin / 10 to 14-pin Cable Kit for Y1153A, Y1154A
• Y1159A - 16-to-16 pin cable kit for Y1150A/51A/52A/53A/54A/55A