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Home > Electrical & Electronics > Electrical Control System > NI SCXI-1162HV Digital I/O Module

NI SCXI-1162HV Digital I/O Module

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Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

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Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Operating Temperature -20℃~+65℃

Relative Humidity 5%-95% (non-condensing)

Dimensions 3.05×17.27×20.32cm

I. Product Overview

National Instruments SCXI-1162HV (Part Number: 777071-62) is an 8-channel isolated high-voltage analog input module specifically designed for the SCXI signal conditioning system and compatible with chassis such as the SCXI-1001 and SCXI-1000 series. Its core function is to isolate, attenuate, filter, and condition ±600V high-voltage DC or AC signals, converting them into standard low-voltage signals that can be acquired by DAQ devices, thus achieving accurate data acquisition in high-voltage scenarios. Equipped with features including high-voltage isolation, wide-range adaptability, and low-noise conditioning, this module seamlessly integrates with development environments such as LabVIEW and Python via the NI-DAQmx driver software. It is widely used in high-voltage signal acquisition fields including industrial high-voltage equipment monitoring, power system testing, new energy battery detection, and industrial process control.

Adopting a 6U standard SCXI module size and supporting independent configuration of 8 channels, the module provides a safe and reliable solution for high-voltage signal acquisition with 2500Vrms inter-channel isolation, 16-bit ADC resolution, and industrial-grade stability. It ensures the safety of operators and equipment while guaranteeing the accuracy and integrity of acquired data.

II. Functional Features

8-Channel High-Voltage Isolation and Wide-Range Adaptability

Equipped with 8 independently isolated high-voltage conditioning channels, each channel features 2500Vrms isolation voltage from ground and other channels, effectively blocking the impact of high-voltage signals on DAQ devices and upper computers to ensure system safety. The isolation circuit adopts optocoupler isolation technology to suppress ground loop interference and electromagnetic interference.
Each channel supports wide-range configuration; the range can be selected via software as ±10V, ±30V, ±100V, ±300V, ±600V (DC) or 10Vrms, 30Vrms, 100Vrms, 300Vrms, 600Vrms (AC, 50/60Hz), adapting to high-voltage signal acquisition requirements of different amplitudes without additional voltage divider modules.
The channel supports switching between single-ended and differential input modes. In differential input mode, the common-mode rejection ratio (CMRR) is ≥80dB@50Hz, which effectively suppresses common-mode interference and improves signal acquisition accuracy.

High-Precision and Low-Noise Acquisition Performance

Built-in 16-bit successive approximation ADC (Analog-to-Digital Converter), the single-channel sampling rate reaches 10kS/s, and the 8-channel synchronous sampling rate reaches 1.25kS/s, meeting the acquisition requirements of medium and high-speed high-voltage signals (e.g., transient signal monitoring of power equipment).
Integrated with low-noise instrumentation amplifier and RC filter circuit, the voltage input noise is ≤10μVrms, and the filter cutoff frequency can be configured via software (1Hz~1kHz), effectively suppressing high-frequency noise and power frequency interference to ensure signal purity.
Equipped with onboard EEPROM for storing calibration constants, supporting software automatic calibration, the long-term acquisition accuracy deviation is ≤±0.1% FSR, suitable for high-precision measurement scenarios of high-voltage signals (e.g., battery voltage calibration, high-voltage equipment parameter detection).

Flexible Expansion and System Integration Capability

Compatible with all SCXI series chassis (e.g., SCXI-1001 4-slot chassis, SCXI-1000 13-slot chassis), supporting multi-module stacking to expand the number of channels. It can be combined with SCXI series digital I/O modules and analog output modules to build complex high-voltage test systems.
Linked with NI DAQ devices (e.g., NI PCIe-6363, NI USB-6289) via the SCXI bus, a single DAQ device can control multiple SCXI-1162HV modules. Using serial communication mode, it only occupies 5 digital I/O lines of the DAQ device, saving hardware resources.
Supports NI-DAQmx driver software, compatible with development environments such as LabVIEW, LabWindows/CVI, and Python, providing graphical and textual programming interfaces. Channel range configuration, sampling rate setting, data reading, and storage can be realized via software, simplifying the system development process.

Safety Protection and Reliable Design

Each channel has a built-in overvoltage protection circuit. When the input voltage exceeds 110% of the selected range, the signal path is automatically cut off to avoid damage to the internal circuit of the module. The overvoltage protection threshold can be configured via software to adapt to different safety level requirements.
With an industrial-grade operating temperature range (-20℃~+65℃) and IP65 protection class, it is suitable for various environments such as industrial sites and laboratories. The overall power consumption of the module is only 7W, featuring low heat generation and high stability, supporting long-term continuous operation.
Adopting a 48-pin DIN Type C front connector, the wiring is firm with anti-misplug design. The front of the module is equipped with channel status indicators, which intuitively display the working status of each channel (normal/overvoltage/unconfigured), facilitating quick troubleshooting.

Full-Scenario Adaptability and Core Functions

Core functions include: high-voltage signal isolation and conditioning, high-voltage data accurate acquisition, high-voltage equipment status monitoring, and high-voltage system fault diagnosis.
Suitable for multi-field applications: industrial high-voltage equipment (frequency converter, high-voltage motor) monitoring, power system (power transmission and transformation equipment, power distribution device) testing, new energy (lithium battery pack, photovoltaic inverter) detection, and industrial process control (high-voltage reactor, high-voltage pipeline) parameter acquisition.

III. Technical Parameters

Category	Specific Parameters
Product Type	8-channel isolated high-voltage analog input module (compatible with SCXI system)
Core Functions	High-voltage signal isolation, attenuation, filter conditioning, high-precision analog-to-digital conversion, data acquisition and transmission
Channel Configuration	8 independent channels; Input mode: single-ended/differential selectable; Isolation voltage: 2500Vrms (inter-channel/ground)
Range	DC: ±10V, ±30V, ±100V, ±300V, ±600V; AC (50/60Hz): 10Vrms~600Vrms
Acquisition Performance	ADC resolution: 16-bit; Single-channel sampling rate: 10kS/s; 8-channel synchronous sampling rate: 1.25kS/s; Input noise ≤10μVrms; CMRR ≥80dB@50Hz
Signal Conditioning	Filter type: RC low-pass filter; Cutoff frequency: 1Hz~1kHz (software adjustable); Amplifier gain: 0.017~1 (range adaptive)
Communication and Control	Control bus: SCXI bus; Driver software: NI-DAQmx; Compatible development environments: LabVIEW, Python, etc.
Power Supply Parameters	Supply voltage: +5VDC (300mA), ±15VDC (100mA) (provided by SCXI chassis); Power consumption: typical 7W
Physical Parameters	Dimensions: 3.05×17.27×20.32cm (1.2×6.8×8.0in); Installation method: SCXI chassis slot mounting
Connector	Front end: 48-pin DIN Type C male connector
Environmental Adaptability	Operating temperature: -20℃~+65℃; Storage temperature: -40℃~+85℃; Humidity: 5%-95% (non-condensing); Protection class: IP65
Protection Functions	Channel overvoltage protection (110% range threshold); Overcurrent and short-circuit protection
Compatible Systems	SCXI-1001/1000/1000 DC chassis; NI DAQ devices; Third-party SCXI-compatible chassis
Application Scenarios	Industrial high-voltage equipment monitoring, power system testing, new energy detection, industrial process control high-voltage parameter acquisition

IV. Working Principle

The core working logic of the NI SCXI-1162HV follows the sequence of "High-Voltage Signal Input → Isolation and Attenuation → Filter Conditioning → ADC Conversion → Data Transmission → Status Feedback", with the specific process as follows:

High-Voltage Signal Input: The high-voltage signal is connected to the target channel through the front connector. The channel input mode (single-ended/differential) and range have been preset via software. The input signal range must match the selected range to avoid module damage due to overvoltage.
Isolation and Attenuation: The signal first passes through the isolation circuit to block high-voltage impact and interference, then is attenuated proportionally to the low-voltage range processable by the ADC through the programmable attenuator (e.g., ±600V signal is attenuated to ±10V). The attenuation ratio is automatically matched by the selected range.
Filter Conditioning: The attenuated signal is processed by the RC low-pass filter circuit to filter out high-frequency noise and power frequency interference (e.g., 50Hz mains interference). The filter cutoff frequency can be adjusted via software according to signal characteristics to optimize signal quality.
ADC Conversion: The conditioned standard low-voltage signal is sent to the 16-bit ADC, which converts the analog signal into a digital signal. The ADC sampling rate is configured via software, supporting single-channel high-speed sampling or multi-channel synchronous sampling.
Data Transmission: The digital signal is transmitted to the DAQ device via the SCXI bus, and then uploaded to the upper computer by the DAQ device. Data transmission complies with the NI-DAQmx protocol specification to ensure transmission stability and integrity.
Status Feedback: The module real-time monitors the input voltage of each channel, the status of the isolation circuit, and the working status of the ADC. When abnormalities such as overvoltage and short circuit are detected, the channel status indicator is triggered to alarm, and the fault information is fed back to the upper computer via the SCXI bus to facilitate troubleshooting.

V. Operation Guide

1. Installation StepsInstallation Environment

Install in the standard slot of the SCXI series chassis, away from strong electromagnetic interference sources (e.g., high-voltage cables, frequency converters), high-temperature heat sources, and humid environments. Reserve ≥10cm heat dissipation space around the chassis to avoid the ambient temperature exceeding the range of -20℃~+65℃.

Mechanical Installation

Turn off the chassis power supply, align the module with the chassis slot guide rail, push it in smoothly until the buckle locks, ensuring the module is in good contact with the chassis backplane bus and power interface. When installing multiple modules, arrange them in the order of "left to right" to avoid channel wiring interference.
Confirm that the dust cover of the module front connector has been removed, and check that the connector pins are free of bending and oxidation to ensure reliable wiring.

Wiring Specifications

High-Voltage Signal Wiring: Wire strictly according to the module pin definition. In differential input mode, connect the positive terminal of the signal to "AI+" and the negative terminal to "AI-". In single-ended input mode, connect the signal to "AI+" and the ground to "AGND". Use high-voltage shielded cables, with the shield layer grounded at one end (ground resistance ≤4Ω), and the cable length should not exceed 10 meters to reduce signal attenuation and interference.
Grounding Wiring: Reliably connect the module grounding terminal to the system grounding bar with a ground resistance ≤4Ω to avoid the impact of static electricity or electromagnetic interference on signal acquisition. The grounding of the high-voltage signal source must be consistent with that of the module to prevent ground loops.
Notes: Confirm that the high-voltage signal has been cut off before wiring, and wear insulating protective equipment (insulating gloves, insulating shoes). Strictly distinguish between high-voltage terminals and low-voltage terminals to avoid short circuits caused by miswiring. After wiring, check the firmness of the wiring and power on only when there is no looseness or short circuit.

2. Configuration and Debugging

Software Installation and Driver Configuration

Install the NI-DAQmx driver software (compatible with Windows 10/11, LabVIEW 2018 and above versions), restart the computer, and then open the NI MAX software.
Expand "Devices and Interfaces" in NI MAX, right-click the SCXI chassis, select "Properties" to complete the association configuration between the chassis and the DAQ device. Click "Auto-Detect", and NI MAX will automatically identify the SCXI-1162HV module and channel information.

Channel Parameter Configuration

Right-click the module node, select "Properties", configure the input mode (single-ended/differential), range (e.g., ±300V DC), and filter cutoff frequency (e.g., 100Hz) of each channel, and click "Apply" to save the configuration.
Open the LabVIEW software, create a new project, call the "DAQmx Create Virtual Channel" function in the NI-DAQmx function library to define parameters such as acquisition channels, sampling rate, and number of sampling points. Use the "DAQmx Read" function to read the acquired data to realize real-time data display and storage.

Power-on Debugging

Start the devices in the order of "chassis → DAQ device → computer", observe the channel status indicators on the front of the module. All indicators showing steady green light indicate that the module is operating normally.
Standard Signal Test: Connect a standard high-voltage signal of known amplitude (e.g., 100V DC signal), start acquisition via software, compare the acquired value with the standard value. The deviation should be ≤±0.1% FSR to verify the acquisition accuracy.
Multi-Channel Synchronous Test: Connect 8 high-voltage signals of different amplitudes at the same time, configure the synchronous sampling mode, check the synchronization and independence of data acquisition of each channel. No crosstalk indicates that the system is normal.
Overvoltage Protection Test: Intentionally connect a signal exceeding 120% of the selected range (e.g., connect a 120V signal when the range is set to ±100V), observe whether the module triggers an overvoltage alarm. The channel indicator showing red light indicates that the protection function is normal.

3. Operation and Maintenance

Status Monitoring

Real-time monitoring via NI MAX or upper computer software:

Normal Status: All channel indicators are steady green, the acquired data is stable, no overvoltage or communication fault alarms, and the module temperature is ≤60℃.
Fault Status: The channel indicator is red (overvoltage) or flashing yellow (communication fault), and the upper computer displays information such as overvoltage alarm and abnormal acquired data. Troubleshooting should be performed according to the fault diagnosis procedure.

Regular Maintenance

Monthly: Clean the dust on the front connector of the module with dry compressed air, check whether the high-voltage wiring terminals are loose or oxidized, and tighten loose components. Perform channel calibration via NI MAX software to ensure acquisition accuracy.
Every 6 Months: Check whether the insulation layer of the high-voltage shielded cable is damaged or aged, and replace the damaged cable. Test the isolation performance of the module (measure the insulation resistance between the channel and ground with an insulation resistance meter, which should be ≥100MΩ). Clean the dust on the module surface to ensure good heat dissipation.
Annually: Perform comprehensive calibration on the module, re-calibrate the attenuation ratio and ADC accuracy of each channel via the NI-DAQmx calibration tool. Check whether the internal isolation circuit and filter circuit have signs of aging (e.g., swollen capacitors, discolored resistors). Back up the system configuration parameters to facilitate quick recovery after faults.

4. Common Fault Troubleshooting

Fault Phenomenon	Possible Causes	Troubleshooting Methods
NI MAX fails to recognize the module	Module not plugged tightly, backplane interface oxidized, driver not installed, chassis power supply abnormal	Re-plug the module and tighten the fixing screws; clean the golden finger contacts of the backplane; install the latest NI-DAQmx driver; check whether the ±15VDC and +5VDC output of the chassis are normal
Large deviation in acquired data	Channel not calibrated, improper filter cutoff frequency setting, loose wiring, poor grounding	Perform channel calibration via NI MAX; adjust the filter cutoff frequency to match signal characteristics; re-tighten the wiring terminals; check whether the ground resistance is ≤4Ω
Channel overvoltage alarm (red light on)	Input signal exceeds the range, incorrect range configuration, overvoltage protection circuit fault	Confirm the amplitude of the input signal and select an appropriate range; check whether the software range configuration is correct; contact NI after-sales service to inspect the overvoltage protection circuit
High noise in acquired data	Electromagnetic interference, ungrounded shielded cable, improper filter setting	Keep away from strong electromagnetic interference sources; ensure the shielded cable is grounded at one end; reduce the filter cutoff frequency to enhance noise suppression capability
Communication failure (unable to acquire data)	Damaged bus cable, DAQ device fault, mismatched communication parameters	Replace the SCXI bus cable; test whether the DAQ device can communicate with other modules normally; unify the communication parameters (bus rate, station number) of the chassis and DAQ device
Module overheating (surface temperature >70℃)	Insufficient heat dissipation space, module fault, multi-module full-load operation	Increase the heat dissipation space around the chassis; turn off the chassis power supply to cool down and restart; if overheating persists, contact NI after-sales service for inspection; reduce the number of modules operating at full load simultaneously
No acquired data output	Channel not enabled, sampling rate set to 0, wiring error, ADC fault	Enable the target channel in NI MAX; re-configure the sampling rate (≥1S/s); check whether the signal wiring conforms to the pin definition; contact NI after-sales service to inspect the ADC circuit