SECOND SOLUTION (BELOW)
High resolution encoders with Intelligent Handset connection (low cost 10 arc second resolution).
The HEIDENHAIN IK220.EXE programme when set up for ENDAT absolute encoder mode does not have any offset or scale factors that can be applied to the data. Not to worry, the calibration is done in further software written by AWR Technology to convert the encoder numbers to astronomical units (HHI.EXE). We also modified the IK220.EXE programme to provide TCP/IP export of the emcoder data.
|FEATURES of HHI PROGRAM
These encoders can be fitted to any telescope which is manually, partially driven or fully driven. They are eminently suitable for TANGENT arm and SECTOR drives but you do have to provide gears to operate the encoder over the full working angle you require. MACK CONSULTANTS and AWR TECHNOLOGY fitted this encoder to all four telescopes at the Equatorial Group, Herstmonceux (ex RGO), now the Observatory Space Science Centre:
Guide prices are £2000 for the Heidenhain equipment, £300 for the AWR software and other items as needed. Design help is available from Alan Buckman at AWR at normal commercial rates.
External encoders now integrated into Intelligent Handset with extra hardware - a QUADRATURE DECODER BOX.
AWR have recently designed an interface to take signals from the TTL output version (ROQ425) HEIDENHAIN ENCODERS and convert it to pulse and direction as used in the Intelligent Handset. This means that with suitable gearing, a closed loop encoder system is now available for the IH, with enough resolution to provide very accurate positions. The converter box takes two quadrature pulse trains and converts to pulse and direction. The resolution depends on the gearing from the prime axis to the encoder and is as accurate as the mechanical gearing will allow. The main advantage is that if there is slippage in the main drive (for example if friction drive reduction is used) then it now does not matter. Separate menu functions in the IH allows setup of the encoder resultion.
This solution is on the
This product can use any quadrature output encoder including the low cost Hewlett Packard encoder sold by JMI. Further details of upgrade price on this extension product please contact AWR. It can be supplied in various configurations, so it is necessary to price it accordingly. As a guide it is from £110.00 (UK price).
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