The NI BNC-2140 is a Dynamic Signal Acquisition signal conditioning accessory that provides direct BNC connectivity for analog signals interfacing with NI DSA plug-in devices. It delivers four independently configurable analog inputs and two analog outputs via BNC connectors, with integrated IEPE signal conditioning for direct sensor connection. The unit includes a 1-meter shielded SHC68-C68-A1 cable terminating in dual 68-pin VHDCI connectors for seamless integration with compatible NI hardware.
Technical Specifications
Signal I/O
• 4 analog inputs (BNC)
• 2 analog outputs (BNC)
• 68-pin VHDCI female connector (main interface)
IEPE Signal Conditioning
• Per-channel independent enable/disable
• 4 mA constant current source on each input channel
• Manual power cutoff with LED power indicator
• Designed for IEPE sensors (accelerometers, microphone preamplifiers)
Input/Output Configuration
• Selectable Single-Ended (SE) or Differential (DIFF) on all analog channels
• 50 Ω ground termination resistor in SE mode
• Maximum input voltage: ±42.4 V
Cable Specifications (SHC68-C68-A1)
• Length: 1 meter
• Characteristic impedance: 50 Ω ±10%
• Maximum voltage: ±30 VDC
• Conductor DC resistance: 0.5 Ω
• Propagation delay: 4.9 nanoseconds
• Channel-to-channel skew: 50 picoseconds
• Supports 40 single-ended channels
Physical
• Dimensions: 5.7 × 4.4 × 2.2 inches
• Power sourced from DSA device via 68-pin connector
– Key Features
• Manual mode switching between differential and single-ended operation
• Independent IEPE control per input channel with visual power status
• Low conductor resistance (0.5 Ω) and tight channel skew (50 ps) minimize signal degradation
• Included 1-meter cable with matched impedance and controlled propagation delay
– Compatibility & Integration
Designed for National Instruments DSA devices: PCI-4451, PCI-4452, PCI-4551, and PCI-4552. Connects directly via the included SHC68-C68-A1 shielded cable with dual male VHDCI connectors.
