The NI SCB-68A is a 68-pin shielded I/O connector block that interfaces directly with National Instruments 68-pin and 100-pin DAQ devices. It provides signal connectivity through 68 screw terminals (14–30 AWG wire gauge) with integrated signal conditioning pathways, cold-junction compensation for thermocouple measurements, and dual breadboard areas for custom circuit implementation. The shielded architecture and resettable electronic fuse deliver noise immunity and surge protection essential for industrial measurement systems.
Technical Specifications
Electrical Performance:
• Power consumption: 1 mA typical (no conditioning installed); 800 mA maximum from host computer
• CJC sensor accuracy: ±1.0 °C (0–70 °C operating range)
• Integrated cold-junction compensation for thermocouple temperature measurement
• Screw terminal torque: 0.5–0.6 N⋅m (4.4–5.3 in.⋅lb)
• Resettable electronic fuse provides over-surge protection
• Chassis ground lug rated 1 mA maximum for high-impedance source grounding
• Safety: IEC 61010-1, EN 61010-1, UL 61010-1, CSA 61010-1 compliant
• Maximum input voltage: 30 Vrms / 42 Vpk / 60 VDC
Connectors & Terminals:
• 68 female screw terminals, 68-pin female D-SUB secondary connector
• Wire gauge support: 14–30 AWG
• Through-hole pad diameter: 0.8–0.9 mm
• Two general-purpose breadboard areas for prototyping
Physical Design:
• Rugged metal enclosure with magnetic removable lid for field access
• Mounting: panel, wall, or 35 mm DIN rail (optional kit required)
– Key Features
• Shielded architecture reduces noise in sensitive analog measurements
• Integrated signal conditioning supports filtering, 4–20 mA current inputs, open thermocouple detection, and voltage attenuation
• Flexible prototyping capability via breadboard areas and through-hole pads for component interchangeability
• Cold-junction compensation sensor eliminates external reference requirements for thermocouple systems
• Tool-free lid design accelerates field reconfiguration
– Typical Applications
Industrial temperature measurement with thermocouple interfaces; distributed DAQ systems requiring shielded field connectivity; custom signal conditioning in noise-sensitive environments; 4–20 mA sensor acquisition; prototyping and validation of measurement circuits.
– Compatibility & Integration
Direct compatibility with NI 68-pin and 100-pin DAQ devices. Accepts standard wire termination (14–30 AWG) and through-hole component placement. External +5 V power input available for powered signal conditioning circuits.
