Tektronix / Keithley KPCI-3140 8-Channel, 40 MHz Counter/Timer with Digital I/O Board

The Tektronix/Keithley KPCI-3140 is a PCI bus data acquisition board delivering eight 16-bit counter/timers, four 24-bit internal interval timers, and 32 programmable digital I/O lines. Built for precision timing, frequency measurement, and event counting in automated test and measurement systems, it operates at a maximum counter/timer frequency of 40 MHz typical and supports both internal and external clock sources. The board includes an internal 20 MHz pacing clock and level-sensitive digital inputs with 60 mV hysteresis. DriverLINX software provides high-level configuration and programming without direct register manipulation.

– Technical Specifications

Counter/Timers
• Eight 16-bit counter/timers with individual clock and gate inputs
• Maximum frequency: 40 MHz typical
• Internal clock time base: 25 ns
• Output frequencies (internal clock): 610 Hz to 40 MHz
• Internal interval timers: Four 24-bit units with output frequencies from 2.38 Hz to 20 MHz
• Cascadable internally to 32-bit resolution; external cascading via screw terminal panel accessory
• CPU interrupt generation on counter zero crossing

Digital I/O
• 32 lines organized in four banks of 8 lines
• Programmable per-line input or output configuration
• Input specifications: 2.0 V minimum (high), 0.8 V maximum (low), ±200 mV sensitivity, 60 mV hysteresis
• Minimum pulse width for Port D: 66 ns (interrupt-on-change detection)
• Output driver capabilities: 15 mA source, 24 mA sink
• Software or external gate control of digital outputs
• Port D interrupt-on-change with per-bit enable masking

Pacing Clock
• Internal 20 MHz source for all timing and I/O pacing functions

– Key Features

• Flexible clock sourcing: internal 20 MHz or external clock inputs
• Cascade architecture for extended counter resolution
• Per-port interrupt capability on digital input state changes
• Solid-state relay module compatibility via 24 mA sink/15 mA source outputs
• DriverLINX software abstraction for rapid integration

– Typical Applications

• Precision frequency and timing measurements
• Event counting and data logging
• Automated test equipment (ATE) control and synchronization
• Real-time process monitoring with programmable digital control

– Compatibility & Integration

PCI bus interface; supported by DriverLINX software for Windows and real-time environments.