The IF4S is designed to perform 1MHz capacitance measurements on dual segment devices in conjunction with the 3600E tester. Designed to be mounted on or near a handler or prober, the IF4S contains the relays necessary for connecting a capacitance meter through relatively short leads to the various pins of the DUT. Each capacitance interface option includes a capacitance meter, and an IF1 Standard Interface. For non-capacitance test types these interface options are effectively transparent.

To achieve capacitance measurement accuracy and repeatability, the system maintains an auto calibration file on the open socket offsets for all capacitance test types and for each range of the capacitance meter.

The IF4S includes programmable lead switching. The lead switching feature, which is controlled by the test program, provides the flexibility to switch both force and sense of the tester's three Kelvined leads (source/emitter, drain/collector, gate/base) for any combination at the IF4S output. This allows the test leads to be connected to the DUT for any possible device pin-out configuration, offering the advantage of using one test fixture per package style regardless of the device pin-out. To support testing of dual segment devices, the output lead configuration may be defined for both segments of the device.

Another feature of the IF4S is user programmable component plugs, which allow external components to be connected between the various leads of the DUT under control of the test program. The component plugs can be programmed for use in non-capacitance test types as well.