Keysight / Agilent 10889B Overview

The Agilent 10889B PC servo-axis board is a programmable, digital servo with built-in motion control algorithms. The combined servo-axis board provides a complete closed-loop positioning solution for PC-based laser interferometer systems. It offers both high resolution and a high sample rate. Output is a ±10 V analog motor drive signal updated at 20 kHz. Position outputs are available over the PC backplane and via direct hardware output.

Features:

• Motor Drive Outputs
• +/-10 V analog (DAC and AGND):
• * Resolution: 0.305 mV
• * Output updated at sample rate
• * Programmable limit (centered on 0 volts)
• Programmable Control
• Programmable Sample Rate: 250 Hz to 20 kHz (depending on equation used)
• Programmable Difference Equation Coefficients:
• 3 coefficients for PID
• 5 coefficients for IIR
• Programmable Feedforward Terms:
• Feedforward Velocity
• Feedforward Acceleration
• Feedforward Delta Acceleration
• Proifiling Modes:
• Internal and External Position Profiling
• Internal and External Velocity Profiling
• Buffered Position Profiling (Linear Interpolation available)
• Programmable Profile Limit Terms:
• Position Profiling (velocity, acceleration, and delta acceleration)
• Velocity Profiling (acceleration and delta acceleration)
• Programmable Trace Function:
• Buffer Size: 32 K longwords
• Data Size:
• Reference position, actual position: one long word
• Difference equation output, drive signal output: half long word
• (Position Error can be displayed from reference position minus actual position)
• Included Software Tools
• - Tune Program
• - Demo Programs
• - Library of C Functions
• - User Downloadable Routines
• (Contact your Agilent Sales Representative for C Function Libraries and Downloadable Routines.)
• Resolution
• Optics Resolution
• Linear or Single Beam lambda/128 or 5 nm (0.2 micro inch)
• Plane Mirror lambda/256 or 2.5 nm (0.1 micro inch)
• High Resolution lambda/512 or 1.2 nm (0.05 micro inch)
• Hardware Position Output
• (Uses PC Internal Ribbon Cable Connector)
• Binary Units: Fractions of a wavelength, 2''s complement
• Data Update Rate: 10 MHz for all laser heads
• Data Age: Typical 1.2 us fixed
• <1 ns ambiguity for constant ambient temperature
• <10 ns ambiguity over a temperature range of 0-55 degrees C
• Assumes sampling is synchronized to the 10 MHz clock
• Least Significant Bit (one count) equals resolution/4
• PC Backplane Position Output
• Binary Units: Fractions of a wavelength, English or metric
• Least Significant Bit (one count) equals resolution
• Data Update Rate (typical): Varies according to board configuration and
• PC performance
• Units 386/25 PC 486SX/25 PC
• Inches or metric 7 kHz 8 kHz
• Raw, uncompensated counts 10 kHz 12 kHz
• Note: Custom downloadable software may significantly improve these data rates. Contact your Agilent Sales Representative for details.
• Power Requirements (typical)
• 5 Vdc + 0.25V / -0.125 V at 3.0 A
• +12V +/-0.5 Vdc at 0.15 A
• -12V +/-0.5 Vdc at 0.05 A
• Physical
• Weight: 0.45 kg (1 lb)
• Operating Temperature: 0-40 degrees C (32-104 degrees F)
• PID filter included for simpler positioning problems; IIR filter handles more complex situations
• Tuning software speeds startup
• Trace capability simplifies optimization and servo-loop
• characterization
• Robust feature set provides versatility
• Customized routines available from Agilent

General

• Platform and size: PC-ISA-AT, 114 x 339 mm
• Number of Axes per Board: 1
• Resolution Extension: x64
• External Sample Inputs: 1

Operation with Plane Mirror Optics

• Resolution: 2.5 nm
• Maximum Velocity (also limited by laser head): 550 mm/sec

Timing

• Position Data Update Rate: 10 MHz
• External Asynchronous Sample Uncertainty: ± 50 ns
• Data Age Variation: < 1 ns @ constant Temp, < 10 ns for 0 to 55 deg C
• Servo Sample Rate: 250 Hz to 20 kHz (max depends on difference equation used)

Special Features

• ± 10V Analog Output for closed loop servo control
• PID and 2nd and 3rd order IIR Difference Equations included
• 32-bit, 2´s Complement Hardware Position Output @ 10 MHz
• 32-bit Programming API available for Windows 9x, NT, 2000, XP

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