The SNAP-AIRATE-HFi rate-input module and SNAP-AOD-29-HFi module with pulse-width modulation (PWM) and time-proportional output (TPO) are ideal for test engineers, technicians and others working with high-speed machinery, equipment test beds, and other applications that monitor high-frequency analog signals and rapidly switch digital outputs in response to a changing analog value. Both SNAP-AIRATE-HFi and SNAP-AOD-29-HFi modules are used with Opto 22's SNAP PAC cystem, which includes programmable automation controllers (PACs) and Ethernet-based I/O systems.