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.