The Agilent 10885A PC axis board, a register-programmed position axis board, is ideal for making open-loop measurements and for providing position data for custom closed-loop servo electronics. It provides a 32-bit position word (in fractions of a wavelength) that is readable over a PC backplane and is also available from a real-time hardware output.

Features:

• PC Backplane Position Output
• Data Format:
• Units: fractions of a wavelength
• 32 bits (4 bytes)
• 2''s Complement
• Positive Logic
• Least Significant Bit (one count) equals resolution
• Typical Data Update Rate Over Backplane (Compiled Quick Basic Program):
• 80286 @ 8 MHz: 58 kHz
• 80386 @ 25 MHz: 74 kHz
• 80486 @ 25 MHz: 105 kHz
• Data Age and Sample Ambiguity:
• After a sample operation, the value in the position register will reflect an actual position that occurred 0.1 to 1.4 us before the sample operation was initiated.
• Sample Delay:
• The position register may be read 1.5 us after a sample operation.
• Connector Position Output
• Data Format:
• Units: fractions of a wavelength
• 2''s Complement
• 32-bit parallel binary
• Positive Logic
• Least Significant Bit (one count) equals resolution
• Data Update Rate:
• Agilent 5517A: 1.5 - 2.0 MHz
• Agilent 5517B: 1.9 - 2.4 MHz
• Agilent 5517C: 2.4 - 3.0 MHz
• (Hardware included to synchronize to slower clocks.)
• Data Age:
• Agilent 5517A: 2.1 - 4.1 us
• Agilent 5517B: 1.8 - 3.3 us
• Agilent 5517C: 1.5 - 2.7 us
• Data Age is dependent on the laser head reference signal (split-frequency) and on knowing exactly when, in relation to the rising edge of the Error Clock, the Position Error lines are sampled. Call this time deltaT.
• Data Age =
• 0.34 us + deltaT us + ((4.0 +/- 0.5) / (Reference (in MHz))) us
• Additionally, the Data Age may vary up to 0.1 us typically and up to 0.25 us in a worst case situation as a result of the Reference frequency varying over time.
• Power Requirements (typical)
• 5 Vdc at 1.6 A
• +/-12 Vdc at 0.015 A
• Weight
• 0.30 kg (0.65 lb)
• Operating Temperature
• 0 - 40 degrees C (32 - 104 degrees F)
• ISA Compatibility
• Standard XT-size board which supports 8-bit bus transfers
• DOS programming environment saves development time
• Eight-bit bus transfers provide compatibility with standard software programs
• Included software programs provide fast setup and data gathering
• Integrated board functions reduce system size, cost, and complexity

General

• Platform and size: PC-ISA-XT, 98 x 339 mm
• Number of Axes per Board: 1
• Resolution Extension: x32
• External Sample Inputs: 1

Operation with Plane Mirror Optics

• Resolution: 4.9 nm
• Maximum Velocity (also limited by laser head): 460 mm/sec

Timing

• Position Data Update Rate: 1/Ref Freq
• External Sample Uncertainty: ± 1/Ref Freq

Special Features

• 32-bit, 2´s Complement Hardware Position Output
• 32-bit Programming API available for Windows 9x, NT, 2000, XP