Agilent Technologies L4400 - Manual (Page 124)

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.
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.
N O T E