The Keysight N1231B is a PCI three-axis laser interferometer board engineered for high-precision position monitoring and closed-loop servo control in electronic testing and measurement systems. Operating via laser interferometer technology with plane mirror optics, the board delivers 0.15 nm resolution across three independent axes and supports maximum velocity to 2800 mm/sec. Position data updates at 20 MHz with hardware output capability matching this rate, enabling direct real-time feedback to external systems. The board integrates into standard PC-PCI slots (33 MHz, PCI rev 2.2) using 16-bit or 32-bit transfers at 3.3 V or 5 V signal levels. Software interfaces support Windows NT4/2000/XP environments with sampling rates to 100 kHz for three-axis position and velocity or 200 kHz for single-parameter monitoring.
– Technical Specifications
• Form Factor: PCI card, 98 × 312 mm
• Axes: 3 independent axes per board
• Resolution (plane mirror optics): 0.15 nm with ×1024 extension
• Maximum Velocity: 2800 mm/sec (laser head limited)
• Position Data Update Rate: 20 MHz
• Hardware Output Data Rate: 20 MHz maximum
• Software Sample Rates: 100 kHz (3 axes position/velocity) or 200 kHz (single parameter)
• Bus Data Rate: 400 kHz (single-axis read, hardware direct)
• Timing Uncertainty: ±4 ns (external asynchronous sample), ±25 ns (asynchronous data hold), ±1 ns (synchronous data hold)
• External I/O: 4 sample + 4 data hold inputs
• Hardware Outputs: 32-bit/axis parallel or 36-bit multiplexed interface
• Threshold Registers: 8 with hardware output and IRQ capability
• Power Supply: +5 Vdc ±0.25 V/-0.125 V @ 2.8 A; ±12 Vdc ±0.5 V @ 50 mA each
– Key Features
• Laser interferometer-based position measurement
• Submicron resolution with extended dynamic range
• Dual-mode hardware position output architecture
• IRQ generation on error, sample, or threshold events
• 8 threshold compare registers for limit and window detection
• PCI-compliant bus interface with flexible data width
– Compatibility & Integration
• Windows NT4/2000/XP operating systems
• Simple programming API provided
• Compatible with Agilent 10886A PC Compensation Board
• Supports Agilent 10751C/D air sensors and 10757D/E/F material temperature sensors for environmental compensation
• Integrates with off-the-shelf and custom servo control systems
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