Product Introduction

NI SHC68-68 is a standard 68-pin VHDCI to D-type shielded I/O cable, belonging to the basic connection cable of the NI DAQ system. It is used for signal transmission between M/X/S series DAQ devices and 68-pin terminal boards / signal conditioning accessories. It adopts a basic shielding + twisted pair design, meeting the requirements of conventional precision acquisition. It is the predecessor of the EP/EPM series and has a standard length of 1 meter (part number 182419-01). It is available in 2/5/10 meters options. Currently, it is mostly replaced by SHC68-68-EP/EPM.

Model Interpretation

SHC: Shielded Cable, a cable for shielding (a prefix specific to VHDCI interface). NI.

68-68: Both ends are 68-pin connectors. Device end: VHDCI; Accessories end: SCSI D-type NI.

Without suffix: Standard shielding version. No EP enhanced noise reduction, no EPM flame retardant and optimized shielding design NI. Technical Specifications

Conductor and Shielding

Core Count: 68 cores, including analog twisted pair, digital twisted pair, power/ground wire.

Wire Gauge: Analog/Digital 30AWG, +5V/ground wire 26AWGNI.

Structure: Overall aluminum foil + woven net dual shielding; Analog/Digital twisted pair without independent shielding NI.

Impedance: Analog differential pair 66±8Ω, Digital differential pair 107ΩNI.

Capacitance: Analog pair ≤ 28pF/ft, Digital pair 14.5pF/ftNI.

Voltage Rating: 300Vrms, Insulation Resistance ≥ 5MΩ@500VDC.

Physical and Environmental

Length: 1 meter (182419-01), optional 2/5/10 meters.

Temperature: Working -20℃～60℃, Storage -40℃～70℃.

Coating: Ordinary PVC, non-flame retardant, wear-resistant and resistant to bending.

Connector: Gold-plated contacts (≥30μin), Insertion and Ejection Life ≥ 1000 times.

Bending Radius: Static ≥ 8 times the outer diameter, Dynamic ≥ 12 times the outer diameter.

Interface and Communication Configuration

Device Side: 68-pin 0.8mm spacing VHDCI male connector (compatible with M/X series DAQ) NI.

Accessory Side: 68-pin 0.050 inch spacing SCSI D-type female connector (compatible with SCXI/SCB-68, etc.) NI.

Compatible Devices: M series (USB-62xx), X series (PCIe-63xx), S series (61xx) DAQ cards.

Compatible Accessories: SCXI-1377/1378, SCB-68, TBX-68, BNC-2110, etc.

Communication Characteristics: Passive full-pin direct connection, supports differential/single-ended analog, digital I/O, counter/encoder parallel transmission; no impedance optimization, long-distance prone to signal reflection NI.

Core Function

Basic Anti-interference: Dual shielding suppresses common EMI/RFI, suitable for ordinary electromagnetic environments.

Multi-signal Compatibility: Simultaneously transmits analog, digital, counter signals, compatible with mixed signal basic systems.

Reliable Connection: Gold-plated contacts + screw fixation, resistant to vibration, resistant to insertion and ejection, suitable for laboratories and general industrial scenarios.

High Cost Performance: Basic design reduces costs, meets budget requirements for non-high-precision acquisition.

Applicable scenarios

Laboratory routine collection: High-level signals such as voltage and current, in an environment without strong interference.

Basic DAQ system setup: M/X series DAQ cards connected to SCB-68/TBX-68 terminal boards.

Non-critical industrial monitoring: Monitoring of equipment status for devices with general accuracy requirements such as temperature and pressure.

Budget priority project: No strict requirements for noise reduction, aiming for a test system with controllable costs.

User and maintenance instructions Instruction Manual

Power-off insertion and removal: Before connecting or disconnecting, turn off the device power to avoid damaging the interface due to hot plugging.

Connection guidelines: Insert smoothly into the interface and tighten the screws for anti-loosening; avoid pulling and sharp corner bending.

Grounding requirements: Single-ended grounding of the shielding layer (DAQ end), to avoid ground loop interference.

Cabling attention: Keep away from strong interference sources such as high-voltage electricity and frequency converters; the bending radius should be ≥ 8 times the outer diameter.

Maintenance instructions

Environment: Dry and well-ventilated, maintain temperature and humidity within the rated range, and keep away from dust and corrosive gases.

Regular inspection: Check every quarter if the connectors are loose or oxidized, and if the outer skin of the cables is damaged.

Cleaning: Wipe with a dust-free soft cloth in the power-off state, and dry the dirty connectors with isopropyl alcohol.

Storage: Coil diameter ≥ 15cm, store in a cool and dry place, avoiding heavy pressure and direct sunlight.