Fixture Characterization Modules (FCM’s) are part of ATE Systems InCal System which provides fully automated n‑port vector error-corrected network analyzer and test fixture s-parameter calibration. Integrated power and noise figure calibration options are available (see sidebar).

With InCal, one or more FCM’s are integrated into the test system and remain in-place through the calibration and measurement sequence. Importantly, FCM’s provide accurate calibration with a single set of connections with or without a device-under-test (DUT) connected. This approach greatly increases system availability and virtually eliminates the possibility of operator error.

In terms of performance, InCal accuracy and repeatability is comparable to that of mechanical TRL calibration. However, in practical use, InCal speed and consistency cannot be matched by mechanical or typical electronic calibration. Complete calibrations can be completed in minutes, not hours.

Accurate and Traceable

FCM’s are fully traceable and verifiable transfer standards capable of transferring factory calibration accuracy to the network analyzer. Each FCM is characterized using a precision calibration technique that is traceable to the National Institute of Standards and Technology (NIST). Unique characterization data is stored in the module’s memory (or externally if required by the user). During calibration, the system uses this data to calculate the error terms for the test system.

Highly Configurable

With its modular implementation, InCal can be easily scaled to the size of the application, capable of calibrating systems with any number of instrument test ports and any number of DUT ports. In-fixture, on-wafer, multiplexer (MUX), and interchangeable test adapter (ITA) applications are well supported.

Easy-to-Use Software

Our development tools, used within common Windows programming environments such as LabWindows/CVI, C#, or Visual Basic .NET, makes calibrations of complex systems much more efficient. Full calibration sequencing with automated signal routing is easily managed.