6-Channel, 150 V, 128 kHz C Series Frequency Input Module—The NI-9326 is a channel-to-channel isolated frequency input module for CompactDAQ and CompactRIO systems. This module includes six differential input channels with a 0 Vrms to 150 Vrms input range. The NI-9326 also features configurable thresholds for connection to a variety of variable reluctance sensors, single channel encoders, and hall-effect sensors. You can use the included embedded counters to perform frequency measurements or edge-counting for tracking total counts on a periodic signal. Additionally, the NI-9326 supports configurable Butterworth filters to help you perform low-noise frequency measurements.