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Home > Electrical & Electronics > Electrical Control System > NI SH68-68-EP Shielded Digital Cable

NI SH68-68-EP Shielded Digital Cable

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

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

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guizhou

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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 0℃ to +60℃

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

Dimensions 2.7×146×190.5mm

I. Product Overview

National Instruments SH68-68-EP is a 68-pin high-performance shielded signal connection product. Its core form is a shielded cable with a "68-pin VHDCI male connector to 68-pin D-SUB female connector" (in some scenarios, it exists as an integrated block, serving as an intermediate adapter between DAQ devices and external accessories). Its commonly associated part number is SH68M-68F-EPM (the official equivalent model of NI). Its core function is to realize stable signal transmission between Data Acquisition (DAQ) devices and external accessories, sensors or signal conditioning modules with D-SUB connectors. It supports high-precision conversion of various sensor signals such as voltage and current, and has the characteristics of anti-interference and convenient wiring.

Designed specifically for industrial automation control systems and laboratory data acquisition systems, this product adopts high-quality shielding materials and twisted-pair structure, which can effectively suppress electromagnetic interference and ensure signal transmission integrity. It is widely used in scenarios such as industrial sensor signal acquisition, automated equipment data interaction, and laboratory scientific research testing. It is a key adapter component for connecting devices and external signal sources in the NI DAQ system. It is compatible with 68-pin or 100-pin DAQ devices (such as NI PCI-6221, USB-6210, etc.), and can be used with SH68-68-EP integrated blocks and R6868 integrated blocks to build a complete signal transmission link.

II. Functional Features

68-Pin Full-Pin Compatibility and Signal Adaptation

It adopts a connector configuration with a 68-pin VHDCI male connector (one end) and a 68-pin D-SUB female connector (the other end), which is fully compatible with the 68-pin interface of NI DAQ devices and external D-SUB interface accessories. It realizes full-pin synchronous transmission of 68-channel signals, supporting distortion-free conversion of analog input/output, digital signals, and sensor signals (voltage and current types).
The pin definition strictly follows the standard signal allocation rules of NI DAQ devices, corresponding to signal channels such as AI, AO, DI, DO, AGND and reference power supply. The pins are clearly marked (etched numbers on the surface of cables or integrated blocks), facilitating quick wiring and troubleshooting, and avoiding data distortion or equipment damage caused by incorrect signal connection.
It supports a wide range of signal transmission, adapting to low-level sensor signals (μV level) to standard industrial signals (0–10V, 4–20mA), meeting the needs of data acquisition with different precisions. It can be directly connected to external devices such as pressure sensors, temperature sensors and displacement sensors.

Strong Anti-Interference and Stable Transmission Design

The cable adopts a twisted-pair structure and an overall shielding layer design (the shielding material is tinned copper mesh), with a shielding coverage rate ≥ 95%. It can effectively suppress electromagnetic coupling interference and radio frequency interference (EMI/RFI), reduce the impact of the external environment on signals, and is especially suitable for signal transmission in strong electromagnetic environments in industrial sites.
The conductor is made of high-purity oxygen-free copper with a reasonable wire gauge (24AWG). It features low signal transmission attenuation and insertion loss ≤ 0.5dB (at 1kHz frequency), ensuring signal integrity during long-distance transmission (supporting standard lengths of 1–3 meters, and longer specifications can be customized), with contact resistance ≤ 5mΩ.
The connector adopts a gold-plated contact design, which is oxidation-resistant and corrosion-resistant, with a plug-in life ≥ 1000 times. It can maintain stable contact performance during long-term use, avoiding signal interruption or fluctuation caused by contact oxidation.

Reliable Structure and Safety Protection

The outer sheath of the cable is made of flame-retardant PVC material, with good mechanical strength and wear resistance, and the protection level reaches IP20. It can effectively resist dust, slight collision and pulling, and adapt to the use needs of various environments such as industrial sites and laboratories.
The connector adopts an anti-misinsertion structure design, which is fixed by a snap-lock mechanism. During plugging and unplugging, it is necessary to align the positioning groove to avoid connector damage caused by reverse insertion or mismatching; the integrated block product is equipped with screw fixing holes, which can be wall-mounted or desktop-mounted to enhance use stability.
It supports a rated voltage of 30V DC/AC and a rated current of 1A per pin, meeting the electrical safety requirements of industrial signal transmission. The insulation resistance between terminals is ≥ 100MΩ @ 500VDC, avoiding the risk of short circuit or creepage.

Flexible Adaptation and Convenient Use

It is compatible with the full range of NI 68-pin DAQ devices (such as PCI-622x, USB-621x, PXI-625x, etc.), and can be used with SH68-68-EP integrated blocks and R6868 integrated blocks to build a complete signal link of "DAQ device → connection cable/integrated block → external sensor/accessory", adapting to the needs of customized connection cables.
The cable length provides multiple specifications (standard 1m, 2m, 3m, customizable), which can be flexibly matched according to the installation distance of equipment, reducing the inconvenience caused by redundant cables or insufficient length; the integrated block product is equipped with 68 independent screw-locking terminals, suitable for 14–22AWG wires, with convenient and firm wiring.
No additional drivers or configurations are required, and it is plug-and-play, simplifying the system construction process. It can quickly realize the connection between DAQ devices and external signal sources, reducing operation complexity and improving debugging efficiency.

Full-Scenario Adaptation and Core Functions

Core functions cover: signal conversion between DAQ devices and external accessories, stable transmission of sensor signals, anti-interference connection in industrial environments, and construction of customized signal links.
Suitable for multi-field applications: industrial automation control systems (production line data acquisition), power equipment testing (signal monitoring), laboratory scientific research experiments (sensor data acquisition), electronic equipment testing (signal transmission adaptation) and other scenarios.

III. Technical Specifications

Category	Specific Parameters
Product Type	68-pin shielded signal connection cable/integrated block (VHDCI male to D-SUB female)
Core Functions	Signal conversion between DAQ devices and external accessories, sensor signal transmission, anti-interference signal adaptation
Connector Configuration	One end: 68-pin VHDCI male connector; The other end: 68-pin D-SUB female connector (Integrated block: 68-pin terminal block)
Compatible Devices	NI 68-pin DAQ devices (PCI-622x, USB-621x, PXI-625x, etc.); External accessories/sensors with D-SUB interface
Transmission Performance	Conductor specification: 24AWG oxygen-free copper; Contact resistance ≤ 5mΩ; Insertion loss ≤ 0.5dB (1kHz); Shielding coverage rate ≥ 95%
Signal Compatibility	Analog signals (μV~10V), digital signals (5V TTL/CMOS), sensor signals (4–20mA, 0–10V)
Electrical Parameters	Rated voltage: 30V DC/AC; Rated current: 1A per pin; Insulation resistance ≥ 100MΩ @ 500VDC
Physical Parameters	Cable length: 1/2/3m (customizable); Weight: about 0.3–0.8kg (depending on length); Outer sheath: flame-retardant PVC
Environmental Adaptability	Operating temperature: 0℃~+60℃; Storage temperature: -40℃~+85℃; Humidity: 5%–95% (non-condensing)
Protection Rating	IP20; Shielding type: tinned copper mesh shielding (cable); Flame retardant rating: UL94 V-0
Plug-in Life	≥ 1000 times (connector); Terminal block: screw-locking type (integrated block), suitable for 14–22AWG wires
Application Scenarios	Industrial automation data acquisition, laboratory scientific research testing, sensor signal transmission, DAQ system signal adaptation

IV. Working Principle

The core working logic of NI SH68-68-EP is "Signal Extraction → Shielded Transmission → Interface Adaptation → Stable Access", and the specific process is as follows:

Signal Extraction: The 68-pin VHDCI interface of the DAQ device outputs analog, digital and other signals, which are accessed through the VHDCI male connector of the cable, or received by the corresponding interface of the integrated block to realize full-pin extraction of device signals.
Shielded Transmission: The signal is transmitted through twisted-pair conductors, and the outer shielding layer effectively isolates external electromagnetic interference, avoiding the impact of EMI/RFI on the signal during transmission; high-purity conductors and gold-plated contacts reduce signal attenuation and contact loss, ensuring the integrity of signal transmission.
Interface Adaptation: Through the 68-pin D-SUB female connector of the cable or the terminal block of the integrated block, the signal is converted into an interface form compatible with external accessories/sensors, realizing the adaptation of different interface standards without additional adapter components.
Stable Access: External sensors or accessories are connected to the cable/integrated block through D-SUB interfaces or wires. After adaptation, the signal is stably transmitted to the DAQ device, or the control signal output by the DAQ device is transmitted to the external actuator to complete two-way signal interaction.