162 34980A User’s Guide
5 Matrix Switch Modules
Matrix Switch Modules
The matrix switch modules for the 34980A offer a convenient way for you to
connect multiple instruments to multiple points on your DUT. For a lower
cost and better specification alternative, you can connect both matrix and
multiplexer (MUX) modules.
Although flexible, it is possible to connect more than one source at the same
time with a matrix. Make sure that dangerous or unwanted conditions are
not created by these connections.
The family of matrix switch modules consists of:
• the 34931A with two (dual) matrices of latching armature switches.
Each matrix is organized in a 4- row by 8- column configuration.
• the 34932A with two (dual) matrices of latching armature switches.
Each matrix is organized in a 4- row by 16- column configuration.
• the 34933A, with non- latching reed switches, which you can configure for:
• differential (2- wire) mode, which has two (dual) matrices.
Each matrix is organized in a 4- row by 8- column configuration.
• single- ended (1- wire) mode, which has four (quad) matrices.
Each matrix is organized in a 4- row by 8- column configuration.
NOTE
Safety Interlock The Analog Buses of the 34980A are capable of
carrying 300V signals. The matrix modules have a hardware
Safety Interlock feature that automatically opens the Analog Bus
relays when the associated interlock pins on the D-sub connectors
(faceplate) lose continuity. This prevents signals on the Analog
Buses from being present on the D-sub connector pins. Optional
terminal blocks available from Agilent automatically provide
continuity for these interlock pins. If cables are used, you must
provide continuity for the interlock pins in your DUT assembly.
See the pinout information later in this chapter for the location of
interlock pins on each module.
The matrix modules have Analog Bus relays on Bank 2 only.
Therefore, the interlock pins are present on only the Bank 2 D-sub
connectors.
Normally, if you attempt to connect to the Analog Buses without
a terminal block or cable connected, an error is generated.
The SYSTem:ABUS:INTerlock:SIMulate command
allows you to temporarily disable errors generated by the Safety
Interlock feature and enables the simulation mode. Although Safety
Interlock errors are suppressed in this mode, the actual Analog Bus
relays affected by the Safety Interlock are disabled as long as no
terminal block or cable is connected to the module.
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