NI SCXI-1160 General-Purpose Relay Switch Module

Equipped with 8 analog input channels, each providing 2500V rms operational isolation—far exceeding standard modules’ isolation levels. This effectively blocks high-voltage interference and ground loop noise, making it suitable for strong electrical environments (e.g., power systems, motor control).

Isolation technology uses transformer coupling or optocoupler isolation to ensure electrical independence between channels and between channels and ground, protecting downstream equipment.

Flexible input range: Supports multi-range voltage signals (±10V, ±5V, ±1V, ±100mV), adapting to output signals from thermocouples, strain gauges, pressure sensors, etc.

Programmable gain and filtering: Gain can be configured as 1, 10, 100, or 1000× to adapt to different input amplitudes; low-pass filter cutoff frequency is adjustable from 10Hz to 10kHz to filter out high-frequency noise (e.g., electromagnetic interference).

Built-in automatic offset calibration function: Grounds inputs via software triggering to compensate for zero-drift errors; EEPROM stores calibration constants for each channel to maintain long-term accuracy.

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

Relies on NI-DAQmx 9.0 and later drivers, compatible with development environments like LabVIEW and LabWindows/CVI. Parameters can be quickly configured via the Measurement & Automation Explorer (MAX) tool.

Supports parallel output (each channel independently connects to a DAQ card) and multiplexed output (8 channels time-share a single channel), adapting to different data acquisition schemes.

Can be stacked with other SCXI modules (e.g., SCXI-1125, SCXI-1141) to expand channel count or functions (e.g., adding filtering/amplification stages), constructing complete signal conditioning systems.

Acquires voltage/current signals from substations and high-voltage equipment. 2500V isolation prevents damage from strong electrical interference, enabling real-time monitoring of grid parameters (e.g., harmonics, power factor).

Collects motor speed and torque sensor signals. Isolation design avoids measurement interference from electromagnetic noise generated by frequency converters, supporting real-time data feedback for closed-loop control systems.

Processes high-voltage sensor signals (e.g., high-voltage capacitor voltage, high-pressure fluid pressure) in aerospace and new energy (e.g., lithium battery charge/discharge testing) to ensure measurement system safety.

Adapts to high-precision sensors (e.g., strain gauges, piezoelectric sensors) for material mechanics testing, vibration analysis, etc. High isolation avoids ground loop interference between multiple devices.

Input front-end: Includes overvoltage protection circuits (TVS diodes) and signal buffers to limit transient voltage and match sensor output impedance.

Isolation amplifier: Uses high-isolation instrumentation amplifiers (e.g., AD210) to achieve signal transmission via transformer coupling while blocking DC interference paths.

Filter module: Eighth-order low-pass elliptical filter with programmable cutoff frequency via switched-capacitor technology, maintaining high attenuation across a wide frequency range.

Calibration unit: Built-in analog switches ground inputs when triggered, calculating offset errors stored in EEPROM for automatic compensation during subsequent acquisitions.

Signal input and protection: Sensor signals enter differential input channels via protection circuits; 1MΩ high impedance reduces loading effects.

Isolation amplification: Isolation amplifiers adjust gain for differential signals (e.g., 100× amplification) while suppressing common-mode interference (CMRR >110dB).

Filtering and output: Low-pass filters attenuate high-frequency noise per configuration; output signals are buffered and transmitted to DAQ devices with 50Ω output impedance for cable matching.

Electrical isolation: 2500V rms isolation fully separates input and output circuits, avoiding current loops from ground potential differences—suitable for multi-ground system scenarios.

Configure gain and filtering parameters via NI-DAQmx driver software; platforms like LabVIEW enable real-time module function invocation. The module supports external clock input for synchronizing multi-channel sampling or filter cutoff frequency adjustment.