NI SCXI-1162 Digital I/O Module

Isolation Performance: Each channel provides 2500V rms operational isolation (channel-to-ground/channel-to-channel). Using transformer-coupled isolation technology, it effectively blocks ground loop noise and high-voltage transient interference, protecting downstream acquisition equipment from strong electrical damage.

Application Scenarios: Suitable for strong electrical environments such as power transformer monitoring, high-voltage motor control, and aerospace equipment testing.

Gain can be configured as 1, 10, 100, 1000 to adapt to sensor signals of different amplitudes (e.g., amplifying weak strain signals to the DAQ acquisition range).

Low-pass filter cutoff frequency is adjustable from 10Hz to 10kHz. Using an eighth-order elliptical filter design with an attenuation rate of 80dB/decade, it effectively filters out high-frequency noise such as electromagnetic interference (EMI).

Input Range: Supports multi-range voltage signals, including ±10V, ±5V, ±1V, ±100mV, compatible with output signals from thermocouples, strain gauges, pressure sensors, vibration sensors, etc.

Programmable Gain and Filtering:

Automatic Offset Calibration: Built-in calibration circuit grounds the input via software triggering to compensate for zero-drift errors. Calibration constants are stored in EEPROM to ensure long-term measurement accuracy (accuracy index: ±0.05% of reading + 2μV).

Overvoltage Protection: Input channels can withstand ±30V transient voltage to prevent module damage from sensor failures or wiring errors.

Communication and Drivers: Relies on NI-DAQmx drivers (compatible with version 9.0 and above), supports development environments such as LabVIEW and LabWindows/CVI, and allows quick parameter configuration via the Measurement & Automation Explorer (MAX) tool.

System Expansion: Can be stacked with other SCXI modules (such as the SCXI-1125 filter module and SCXI-1141 amplifier module) to build customized signal conditioning systems.

Used for voltage acquisition of high-voltage busbars in substations and temperature monitoring of transformer windings (via thermocouples). 2500V isolation prevents high-voltage breakdown of equipment and enables real-time monitoring of grid harmonics, power factor, and other parameters.

Collects signals from servo motor torque sensors and vibration sensors. The isolation design avoids measurement interference from electromagnetic noise generated by frequency converters, supporting real-time data feedback for closed-loop control systems (such as robotic joint torque control).

Processes high-voltage sensor signals (such as voltages of battery packs above 500V) in lithium battery charge/discharge testing; collects high-pressure gas pressure sensor data in fuel cell systems to ensure measurement system safety.

Compatible with high-precision devices such as strain gauges and piezoelectric sensors, used in scenarios like material fatigue testing and structural vibration analysis. High isolation avoids measurement errors caused by ground potential differences between multiple devices.

Input Front-End: Includes TVS diode overvoltage protection circuits and signal buffers to limit transient voltage and match sensor output impedance (such as 100Ω strain gauges).

Isolation Amplification Module: Uses high-isolation instrumentation amplifiers (such as AD210) to achieve signal transmission via transformer coupling, with a common-mode rejection ratio (CMRR) >110dB to effectively suppress common-mode interference.

Filtering and Calibration Unit: Eighth-order low-pass elliptical filter with programmable cutoff frequency via switched-capacitor technology; the calibration circuit grounds the input when triggered, calculates offset errors, stores them in EEPROM, and automatically compensates during subsequent acquisitions.

The isolation layer fully electrically separates the input and output circuits, blocking ground loop current paths (such as interference currents caused by ground potential differences in different devices), suitable for multi-ground systems or high-voltage common-mode voltage environments (such as unbalanced grounding resistance scenarios).