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112 L4400 User’s Guide
5 L4433A Dual/Quad 4x8 Reed Matrix
Matrix Switch Instrument
The L4433A Dual/Quad 4x8 Reed Matrix switch offers 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 the
L4433A matrix instrument and the L4421A multiplexer instrument.
Although flexible, it is possible to connect more than one source at the same
time with the matrix. Make sure that dangerous or unwanted conditions are
not created by these connections.
The features of the L4433A include:
• Non- latching reed switches that can be configured 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 L4400 series
instruments are capable of carrying 300V signals. The L4433A
instrument has 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 L4433A matrix instrument has 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.