CAMAC Progress Report

                    Week Ending: February 23, 2001
                                Week: 4

Tom Folkers:
     1. Finalized I/O specification for embedded computer systems.
     2. Placed order for remaining hardware.
     3. Investigating availability of Linux drivers for I/O cards.

Tom Sargent:
     1. I debugged the programs to correct encoder output for offset, 
        amplitude and phase error. The programs use 32-bit floating 
        point because the T.I. chip is restricted to either 32-bit or 
        40-bit floating point. Using synthetic data, accuracy of all 
        the correction factors is at least 6 digits when using 1000 
        sample points per sin/cos wave. At 100 points/wave it drops to 
        about 3 digits.
     2. Studied least squares methods for fitting ellipses.
     3. I am learning how to write a driver for Linux to be able to 
        port the existing I/O drivers written for kernel version 2.0 
        to kernel version 2.2.  There are significant difference.

Pete Hubbard:
     1. Mounted focus mirror motor and set hardware for maximum 
        resolution and low speed operation. Lots of jitter.
     2. Borrowed servo gear box from tech group used for 90" encoder 
        testing. Used a small Globe DC motor and gear box to turn the 
        Rod456 encoder at slow speed. No noticeable jitter at .5 Hz.
     3. Looking for precision flexible couplings to complete design.