2-Channel C Series Oxygen Sensor Interface Module—The NI‑9757 provides an interface for two Bosch LSU 4.2 or LSU 4.9 wideband exhaust oxygen sensors and four differential narrowband oxygen sensors. The NI‑9757 device driver allows user calibration of stoichiometry versus pump current for a variety of fuel types (gasoline/diesel default). O2 measurements are reported as A/F, F/A, Lambda, and Phi. The NI‑9757 has serviceable, fuse‐protected heater control circuits.