7174A Keithley 8x12, Low-Current, High-Speed Matrix Card

The Tektronix / Keithley Model 7174A Low Current Matrix Card is designed for semiconductor research, development, and production applications requiring high quality, high performance switching of I-V and C-V signals. The Model 7174A is ideal for use with Keithley Models 236, 237, and 238 Source-Measure Units, Model 4200-SCS, and the HP Models 4155 and 4156. The card’s configuration is 8 rows×12 columns, with signal and guard switched at each crosspoint. Offset cur rent has been reduced dramatically to <100fA on all pathways. Significant reductions in the level of parasitic capacitances in the Model 7174A help speed the process of making low level measurements.

The Model 7174A provides an optimum solution to switching the lower level signals common to today’s semiconductor characterization tests. The card’s low leakage and minimal dielectric absorption ensure that key device measurements can be performed many times faster than with current switch ing technologies.

The Model 7174A is fully compatible with the earlier Model 7174, except that it does not contain (or require) the built-in self test. Connections are 3-lug triax with the outer shell connected to chassis for safety and noise shielding. The center conductor is fully surrounded by the inner conducting shield allowing fully guarded measurements to be made with higher isolation and improved speed and accuracy. For applications that require making connections to a large number of devices or test points, the Model 7174A matrix can be expanded with additional cards. On-card connectors are provided to connect the rows (column expansion) between other 7174A cards in adjacent slots of the Model 707A switching mainframe. Eight female-to-female cables are provided with each 7174A to simplify expansion. Up to six 7174A cards can be connected in a single 707A switching mainframe to form an 8×72 or 12×60 matrix.