The Keithley Instruments 2499-DIGIO Calibration Fixture expands the digital I/O capabilities of compatible SourceMeter instruments through 16-bit digital output operation. This fixture enables precise calibration and external device control while maintaining data integrity in automated test environments. It connects directly to the digital I/O port via DB-9 connector and routes signals to external circuits through a standard DB-37 connector.
Technical Specifications
• Digital output lines: 16-bit operation (outputs 1–16)
• Output pattern range: 0 to 65535 decimal (binary 0000000000000000 to 1111111111111111)
• Bank configuration: Bank A (outputs 1–8), Bank B (outputs 9–16)
• Maximum sink current per output line: 100 mA
• Maximum sink current per bank: 300 mA
• Maximum sink current (EOT, /EOT, BUSY, /BUSY line): 500 mA
• Source current per output line: ~2 mA at TTL high levels
• Maximum input voltage: 42 V absolute maximum
• Circuit voltage limits: ≤30 V RMS, ≤42.4 V peak, ≤60 V DC
• Connectors: One female DB-9 (instrument side), one female DB-37 (external circuit side) – Key Features • Direct connection to SourceMeter rear-panel digital I/O port
• Dual-bank architecture for organized output control
• TTL-compatible logic levels with defined current sourcing and sinking capabilities
• Multiple control signals including EOT, /EOT, BUSY, and /BUSY lines with enhanced current handling
• Supports up to 16 discrete output states per operational cycle – Typical Applications • Extended limit testing with up to 16 component bins (pulse handlers) or custom register-based binning
• External relay, switching, or logic circuit actuation
• Automated test equipment (ATE) sequencing and control
• Multi-state device selection and switching in production test – Compatibility & Integration Designed for Keithley Series 2400 SourceMeter instruments (Model 2401 excluded). Integrates directly without additional interface adapters, providing immediate expansion of digital control capability in existing SourceMeter-based test systems.
