Product Introduction

NI SH68-68-EPM is a new generation of high-performance 68-pin shielded I/O cable, serving as an upgraded replacement model for SH68-68-EP. It is specifically designed for NI M/X/S series DAQ devices and 68-pin terminal boards/signal conditioning accessories, used for low-noise and high-integrity transmission of analog, digital, and counter signals. It adopts an enhanced shielding + independent twisted pair + flame-retardant outer covering design, with significantly superior anti-interference and noise reduction capabilities compared to the EP model. It is the preferred choice for high-precision acquisition and industrial applications, with a standard length of 1 meter (part number 184749-01). Additional options of 2/5/10 meters are available.

Model Interpretation

SHC: Shielded Cable, shielding cable (official full name prefix).

68-68: Both ends are 68-pin connectors (device end VHDCI, accessory end SCSI D-type) NI.

E: Enhanced Shielding, enhanced shielding, multi-layer shielding structure.

P: Plenum-rated, ventilation duct grade flame retardant, compliant with UL910.

M: Male/Female compatibility, optimized pairing and impedance matching, stronger noise reduction performance NI. Technical Specifications

Conductor and Shielding

Core Number: 68 cores, analog independent shielded twisted pair, digital twisted pair, power/ground lines are separately designed.

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

Structure: Analog on independent shield + aluminum foil + woven net triple shielding; Digital on twisted pair + overall shielding; Analog/Digital zone shielding, isolating crosstalk.

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

Capacitance: Analog pair ≤ 23pF/ft, Digital pair 14.5pF/ftNI.

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

Physical and Environmental

Length: 1 meter (184749-01), optional 2/5/10 metersNI.

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

Coating: Flame-retardant PVC (UL910), Wear-resistant, bend-resistant.

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

Bend Radius: Static ≥ 8 times outer diameter, Dynamic ≥ 12 times outer diameterNI.

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 cardsNI.

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; impedance matching, reduces signal reflectionNI.

Core Function

Extreme Noise Reduction: Independent shield for analog + zone isolation to suppress EMI/RFI and crosstalk, suitable for microvolt-level weak signals.

High Compatibility Transmission: Supports high-precision analog, high-speed digital, counter signals, suitable for mixed signal systemsNI.

Industrial-grade Reliability: Flame-retardant coating + gold-plated contacts + screw fixation, resistant to vibration, resistant to plugging and unplugging, suitable for long-term operation in industrial sites.

Long-distance Stability: 5 meters internal attenuation small, 10 meters internal 4-20mA signal loss ≤ 0.5%, suitable for remote sensor connections. Applicable scenarios

High-precision data acquisition: Anti-interference transmission of low-level signals such as thermocouples, RTDs, and strain gauges.

High-speed mixed signals: X series (63xx) high-speed synchronous acquisition (up to 5MS/s), analog + digital + counter synchronous testing with NI.

SCXI system setup: DAQ cards directly connected to SCXI-1377/1378 terminal boards, building high-channel-count temperature / strain systems.

Industrial sites and buildings: Frequency converters, motor testing, equipment monitoring; Ventilation duct wiring (flame-retardant certification).

User and maintenance instructions Instruction Manual

Power-off insertion and removal: Before connecting or disconnecting, turn off the device power to prevent interface damage from hot plugging. 

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

Grounding requirements: Single-ended grounding of the shielding layer (DAQ side), avoiding ground loops; differential transmission for analog signals preferred. 

Cabling considerations: Keep away from strong electrical sources, frequency converters, etc. of interference sources; the bending radius should be ≥ 117mm. 

Maintenance instructions

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

Regular inspection: Check for loose connections or oxidation of the connectors, as well as damaged cables every quarter; use isopropyl alcohol to wipe and dry the interface if it is dirty. 

Cleaning: Use a dust-free soft cloth to wipe the interface after power-off, and do not spray liquids directly onto the interface. 

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