User`s guide

209

Chapter 4 Features and Functions

34905A/6A Dual 4-Channel RF Multiplexers

These modules consist of two independent 4-to-1 multiplexers.The

channels in each bank are organized in a “tree” structure to provide high

isolation and low VSWR. Both banks have a common earth ground. This

module does not connect to the internal DMM. You can connect your

signals directly to the on-board SMB connectors or to the

SMB-to-BNC cables provided with the module.

NOTES:

• The 34905A is used for 50 applications. The 34906A is used for 75 applications (mini

SMBs).

• You can close only one channel per bank at a time on these modules; closing one channel

in a bank will open the previously closed channel. One channel in each bank is always

connected to COM.

• This module responds only to the CLOSE command (OPEN does not apply). To OPEN a

channel, send the CLOSE command to another channel in the same bank.

Com1

Com2

Bank Switch

34970A Refresh UG.book Page 209 Wednesday, February 17, 2010 12:34 PM