HP 10889B PC Servo-Axis Board

The HP 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.

Up to six servo-axis boards can be used in a single system for independent, multiple-axis operation. Configured with the appropriate laser heads, optics, sensors, and cables, the HP 10889B is well suited for applications such as servo-track writing on multiple high-density disk drives. Combining the high performance of HP laser interferometers with the lowest-priced, industry-standard ISA backplane speeds development and reduces system costs.

[ Features ]

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
High reliability backed by three-year warranty
Customized routines available from HP

PID and IIR Filters

Programmable control includes selectable difference equations: PID (proportional, integral, differential); IIR (infinite impulse response); user-modifiable downloadable; or customized routines.

Tuning Software

The Tune program provides a front-panel display for the PC servo-axis board. Quickly tune your system using either the PID or IIR difference equation -- simply enter setup parameters and equation coefficients. Menus and softkeys lead you through system profiles.

Trace Capability

The Tune program uses trace during profiled moves to display complete profiles of reference position, following error, difference equation output, and motor drive signal. Record system performance data during moves and display it for immediate feedback.

Robust Feature Set

Features include: destination pipelining; programmable settle detect algorithm and latched out-of-null indication; programmable interrupts.

[ Specifications ]

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 longword
			Difference equation output, drive signal output: half 
			longword

			(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 HP 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 HP 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)












HP 10889B 	PC Servo-Axis Board
   Opt 002 	2 Axis Interconnect Cable
   Opt 003 	3 Axis Interconnect Cable
   Opt 004 	4 Axis Interconnect Cable
   Opt 005 	5 Axis Interconnect Cable
   Opt 006 	6 Axis Interconnect Cable



HP 10886A 		PC Compensation Board

HP 10880A/B/C		Receiver Cables

HP 10881A/B/C/D/E/F	Laser Head Cables

The HP 10889B can be configured with appropriate laser heads, optics,
sensors, and cables to build a complete PC-based interferometer
positioning system tailored to application requirements.









  










 To help you make the
right instrument choices

Your Field Sales Engineer is ready to answer your questions about
specifications, applications and ordering. Find your Field Sales Engineer at
your Local Sales Office.














Related HP 1088XX PC Electronics Family product datasheets:

HP 10885A PC Axis Board

HP 10889B PC Servo-Axis Board



Related product families available online:

HP1088XX PC Electronics Family





















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Page Updated: Thursday November 13 08:02:51 UTC 1997