NI 9361 8-Channel C Series Counter Input Module

The NI 9361 is an 8-channel C Series counter input module engineered for high-speed event counting, timing measurements, and position tracking in industrial and scientific applications. It delivers 32-bit resolution across all channels with a 1 MHz maximum input rate and 100 MHz timebase, enabling precise acquisition of digital signals across diverse measurement types. The module supports single-ended and differential input modes with programmable voltage thresholds (1 V to 4 V), individually configurable pull-up resistors, and integrated protection against overvoltage, overcurrent, and ESD. Built-in digital filtering on each input line suppresses glitches while maintaining measurement fidelity.

– Technical Specifications

• 8 counter input channels, 32-bit resolution per channel
• Maximum input rate: 1 MHz; timebase: 100 MHz
• Single-ended input threshold: 1 V to 4 V (programmable)
• Differential mode supported; pull-up resistor: 5 V, ~1 kΩ, sources up to 5 mA per channel
• Channel-to-earth isolation: 60 VDC continuous / 1000 Vrms withstand (up to 3000 m); 60 VDC continuous / 860 Vrms withstand (up to 5000 m)
• Vsup inputs-to-earth isolation: 60 VDC continuous / 1000 Vrms withstand (up to 3000 m); 60 VDC continuous / 860 Vrms withstand (up to 5000 m)
• Operating temperature: -40 °C to 70 °C; humidity: 10% RH to 90% RH, noncondensing
• Operating vibration: 5 g RMS (10 Hz to 500 Hz); IP40 ingress protection; maximum altitude: 5000 m
• 37-pin D-SUB connector; CAT I measurement category
• Suitable for Class I, Division 2, Groups A, B, C, D, T4 and Class I, Zone 2, AEx nA IIC T4 / Ex nA IIC T4 hazardous locations

– Key Features

• Event counting, pulse width, period, and frequency measurement with Dynamic Averaging
• Duty cycle (PWM) measurement spanning 0% to 100% range
• Quadrature encoder support with incremental two-pulse encoding and optional Z index reloading
• Encoder position and velocity measurement (velocity on CompactRIO systems)
• Programmable digital filter per input to eliminate noise and glitches
• System-level synchronization with analog, digital, and counter measurements

– Typical Applications

• Motor encoder feedback and commutation timing
• Frequency and period monitoring in test and measurement systems
• Pulse train analysis and event logging
• Duty cycle and PWM signal characterization
• Position feedback in automation and robotics

– Compatibility & Integration

The NI 9361 integrates with NI CompactDAQ and CompactRIO platforms, delivering synchronized multi-domain measurement capability within distributed I/O systems.