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\f0\fs32 \cf0 The preference file contains a list of current operating parameters that can be saved by the user and read by the Host program whenever it starts up.  See Basic MiniTweezers Users Guide under DOCUMENTS for an explanation of the variables.  When the Host program starts, it looks in the user's home directory for a file named "PREF" and downloads the values it finds there.  If the file does not exist, the the Host program supplies safe default values, mostly zeros.   Later, when the user has set up the machine by supplying variables such as GOTO positions and maximum / minimum forces, those values can be saved by clicking 
\i Export Pref Values
\i0  under the pull-down FILE menu.  Another primary function of a PREF file is to specify which channels are recorded in a data file.  Those channels must be specified by changing zeros (0) to ones (1) in the PREF file by using an editor such as Text Edit . \
To start a new PREF file (where none has existed before) you should start the host program and then click on 
\i Export 
\i0  
\i Pref Values
\i0  under FILE.   That will create a new file in the User Home directory named PREF.  Then edit the default values in that file with Text Edit.   If the Home directory already has a PREF file but you want a different one, then rename the old PREF file something else, for instance PREF OLD and it will disappear as far as the Host program is concerned. \
Attached here is a PREF file that was made specially  for running the Raster Test .  I usually keep this file in my Home directory named PREF RASTER but change its name to PREF when I need to use it. \
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