Section 11: Model 3732 quad 4x28 reed relay matrix card Series 3700A Switch and Control Cards Reference Manual11-48 3700AS-909-01 Rev. B / December 2011Cross-card expansionYou can use the Model 3706A analog backplane to expand the number of columns in a systembeyond the capacity of a single Model 3732 card. The signal paths on the backplane can be used tointerconnect the rows on up to six Model 3732 cards by closing the appropriate backplane relays onall of the cards.Because the Model 3706A backplane has six dual paths (12 signal paths), cross-card columnexpansion is limited to 12 rows. If you need to expand the columns by more than 12 rows, useexternal wiring to make the necessary row interconnections for the remaining rows.NOTEWhen the Model 3706A backplane is used for column expansion, it is unavailable for use by othercards to connect to the DMM exclusively. It can be used to route the expanded card signals to theDMM as long as the proper rows are used.The next table shows the possible column expansion configurations using two Model 3732 cards.Column expansion configurations with two Model 3732 cards:Column expansionconfigurationMode4x224 1-pole8x112 1-pole12x56 1-pole4x112 2-pole
