6-4 E6198B Switch/Load Unit User Manual
6 Using the Pin Matrix Cards
Disconnect Relays automatically disconnect unused columns to
minimize capacitive loading effects from the Analog Bus. This
makes it possible to expand the system without degrading the
accuracy of measurements.
Besides the 32 x 4 matrix of relays, there are switched auxiliary
I/O lines (AUX1 through AUX32) connected to each of the 32
rows. These ports are for digital I/O operations or other
user-defined applications. For example, you can close any of
these auxiliary relays to connect a digital sensing source (or
other low-impedance system resource) such an event detector
or digital input card, to a pin on the UUT. Because these
auxiliary inputs are available on any of the 32 rows, and on
32-Pin Matrix Card connectors J2 and P2, many inputs can be
connected at once.
Additional features include an integrated relay timer, the ability
to open all relays with a single bit, and series protection
resistors that can be bypassed programmatically. These features
are individually described the following paragraphs starting on
page 6-7.
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