The NI SH68-68 Digital Cable is a 2-meter shielded 68-conductor cable that connects National Instruments DAQ devices to signal conditioning and breakout boxes. Engineered with twisted-pair construction and dual 68-pin female SCSI 0.050 D-Type connectors, it delivers signal integrity across laboratory and industrial measurement systems. The cable combines mixed conductor gauges—28 AWG for digital twisted pairs and 20 AWG for +5 V lines—optimized for low-noise, high-fidelity data transmission.
Technical Specifications
Electrical Characteristics:
• Digital twisted pairs: 100 ± 15 Ohms differential impedance @ TDR, 17.5 pF/ft maximum mutual capacitance, 1.60 ns/ft maximum time delay, 0.070 Ohms/ft maximum conductor DC resistance @ 20 °C
• +5 V lines: 0.012 Ohms/ft maximum conductor DC resistance @ 20 °C
• Fully shielded construction minimizes electromagnetic interference
Physical & Connector:
• Length: 2 meters
• Conductor gauge: 28 AWG (digital pairs), 20 AWG (+5 V lines)
• Connectors: 68-pin female SCSI 0.050 D-Type on both ends
• Color: Black
• Weight: Approximately 0.5 kg
– Key Features
• Twisted-pair wiring ensures controlled differential impedance and consistent signal propagation
• Shielded design reduces crosstalk and external noise coupling
• Dual-gauge conductor configuration optimizes voltage rail and signal performance
• Low time delay (1.60 ns/ft max) maintains timing integrity in counter/timer and digital I/O applications
– Typical Applications
• Digital I/O and counter/timer measurements
• High-speed DAQ signal routing
• Industrial and laboratory automation
• Multi-channel data acquisition systems requiring shielded interconnects
– Compatibility & Integration
The SH68-68 works with NI 6533/4 digital instruments, 660x and 661x counter/timer modules, NI 6810 68-pin connectors, and many 68-pin E Series NI60xxE devices (excluding DAQCards). For M Series and X Series devices, NI recommends the SH68-68-EP variant.
