Specifications

20 System Introduction Chapter 1
Agilent E8793A 32-Pin
Matrix Module
For applications requiring more than 32 channels, the E8793A Pin Matrix
card contains a 4x32 switching matrix (no instrument matrix) and may be
used for increasing channels in increments of 32. The Analog Bus is
daisy-chained from card to card to route the measuring and source
instruments to N*32 channels, where N represents the number of Pin Matrix
cards including the E8792A.
The E8793A 32-Pin Matrix Module compliments the E8792A 32-Pin
Matrix and Instrument Multiplexer Module by multiplexing the four-wire
Analog Bus (ABus1-ABus4) to 32-pins for the UUT. The 32-pin matrix is a
matrix with series disconnect and bypass relays, as shown in Figure 1-6. The
default mode for each column has a 200Ω protection resistor in series with
each column, with the parallel bypass relay open. This provides relay
protection, while allowing two-wire ohms measurements when the parallel
relay is closed. The disconnect relay switches reduce the parasitic
capacitance on the bus when open. The auxiliary (Aux) relays allow a
switchable path from a node on the UUT to one of the Direct Connect ICA
Detectors/Sources, which are also terminated on the mass interconnect.
Typical uses for the Aux relays include connecting an optional DAC, Digital
I/O, or other system resources, such as the Agilent E1418A DAC.
Note For additional information on the Agilent E8792A/8793A, refer to the
Agilent E6198Switch/Load Unit User’s Manual.
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