The National Instruments SMB-2163 is a high speed digital I O accessory for compatible NI digital I O devices. It provides SMB connections for digital lines and is designed to support clean wiring in high speed digital test systems. The accessory is used when engineers need to route digital signals from a DAQ or digital I O card to test fixtures, cables, and external equipment.
High speed digital signals require careful cabling and termination. The SMB-2163 provides a shielded breakout format that helps organize connections and reduce noise pickup. It is suitable for laboratory measurement, automated test, digital communication testing, and system integration where many digital lines must be connected reliably.
SMB Connection Architecture
The SMB-2163 provides SMB connectors for digital I O lines. SMB connectors are compact and support coaxial cable connections, which can be useful for high speed signals. The accessory organizes multiple lines in a single unit, reducing loose wiring and simplifying cable management.
Engineers should match cable impedance and termination to the digital signal requirements. Cable length and routing affect signal integrity. Proper labeling of channels helps prevent connection errors. The accessory should be used within its specified electrical and environmental limits.
Shielding and Signal Integrity
High speed digital signals can radiate and can be affected by external noise. The SMB-2163 uses a shielded enclosure and coaxial connections to support signal integrity. Shielding helps reduce electromagnetic interference and crosstalk when installed correctly.
Good grounding practice is essential. Cable shields should be terminated according to the system design. Signal and return paths should be planned to minimize loops. Engineers should separate high speed digital lines from sensitive analog signals and noisy power conductors.
Compatibility and System Integration
The SMB-2163 is designed for compatible NI digital I O devices. Engineers should verify connector type, pin assignment, and signal voltage compatibility before connection. The accessory can be integrated into a test rack or bench setup with cable ties and strain relief.
For automated test, the accessory can route digital control and status signals between the DAQ device and a fixture. It supports connection to relays, buffers, and digital interfaces. System documentation should include channel mapping and cable identifiers to simplify maintenance.
Applications
The SMB-2163 is suited to high speed digital I O testing, digital communication validation, automated test fixtures, laboratory measurement, and system integration. In a test fixture, it can route control lines, clock signals, and status inputs. In a laboratory, it can support prototype digital interfaces and custom cabling.
The accessory is also useful when digital lines must be connected and disconnected frequently. SMB connectors provide a repeatable connection method. Labeling and cable management help maintain correct connections during test setup changes.
Installation and Maintenance
Installation requires connecting the accessory to the compatible NI digital I O device and routing SMB cables to the test fixture. Cables should be secured to avoid strain on connectors. The accessory should be placed in a location with adequate clearance and protection from mechanical damage.
Maintenance includes inspecting connectors, checking cable continuity, and verifying channel mapping. Damaged cables should be replaced to maintain signal integrity. Documentation of cable assignments and test configuration helps reduce troubleshooting time.
Summary
The National Instruments SMB-2163 High Speed DIO Accessory provides SMB connections and shielded breakout for compatible digital I O devices. It supports organized wiring and signal integrity in high speed digital test systems. The SMB-2163 is a practical accessory for engineers who need reliable digital line routing in laboratory and automated test applications.
