Some other helpful expressions :
JEOL L-Unit Crystal Conversion factors (d/R, where R = 140.0)
Angstroms = d/R * Spectrometer Reading
Cameca Sinφ Crystal Conversion factors (2d)
Angstroms = 2d * Spectrometer Reading
Line 6 (not used at this time)
0 0 0 0 0 0 0 "unused"
Line 7 (backlash size parameter)
400. 400. 400. 400. 400. 400. 400. "backlash size, (hilimit - lolimit)/backlash size"
These parameters define the size of the backlash motions used for the spectrometer and stage motors. The absolute value of each backlash size parameter must be greater than 10.0. Note that the larger the value, the smaller the resulting backlash motion will be. The calculation for the backlash size is :
Where
:
is the size of calculated backlash motion in motor units
is the motor low limit
is the backlash size parameter for the motor
Note that if the backlash size parameter is negative, all wavelength scans will scan from the low end to the high end and, if the backlash size parameter is positive, all wavelength scans will scan from the high end to the low end. In addition, each motor (spectrometer or stage) can have either polarity. That is, one spectrometer can have a negative backlash, while the others have positive backlash values.
Note that the older SX100 instruments (spectro board type = “old”) only support ROM scanning from low to high spectrometer positions (otherwise the scan will start and run but no data is returned). This means that the MOTORS.DAT backlash factors MUST be negative for these older SX100 instruments. For newer SX100/SXFive instruments (spectro board type = “new”) the scan can be run in either direction (backlash factors can be negative or positive).
Normally the backlash factor for each motor should be selected to produce the smallest backlash size that can be tolerated to reduce the time required for the backlash correction.
Note that the program will attempt to determine if a backlash is required based on the last direction of motion for each motor. If the backlash factor is positive and the last motion was from a higher to a lower position and the size of the motion was larger than the calculated backlash size, then a backlash will not be performed on the next occurrence of the backlash adjustment for that motor.
Line 8-15 (not used at this time)
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
Line 16-17 (not used at this time)
0 0 0 0 0 0 0 "unused"
0 0 0 0 0 0 0 "unused"
Line 18 (backlash tolerance)
.002 .002 .002 .002 .002 .002 .002 "backlash tolerance"
These motor parameters are used to allow the user to "tune" the backlash tolerance which the program uses to decide whether to apply a "smart" backlash to the current move. The default is 0.002 (0.2%) and the values must be between 0.1 and 0.000001. Use a smaller value to have the program apply the backlash more often.
The backlash tolerance is also used to determine when the StageMap window picture should be refreshed. If the stage move is less than the backlash tolerance than the StageMap is not refreshed.
Line 19 (park positions)
180.0 180.0 180.0 180.0 180.0 12 12 10 "park positions"
These motor parameters are used to set the "park" positions for the spectrometer and stage motors. The park spectrometer and park stage buttons are available from the Move window. If no position is entered (read zero), then the motor hilimit is used for the spectrometer park positions and the midway point between the hilimit and lolimit is used for the stage park positions.
The stage park position can be specified so as to be used for the instrument sample exchange position if desired.
Line 20 (JEOL velocities)
500000 500000 500000 500000 500000 200000 200000 20000 "JEOL velocities"
The JEOL velocities are used to restore spectrometer and stage speeds to normal operating speeds after they have been reduced for special operations. Currently only used for spectrometer scanning for peaking and “quick” spectrometer scanning. The values must be specified in units of 1/100th micrometers per second. Must be between 2000 (.02mm/sec) and 500000 (5mm/sec). JEOL 8900 is limited to 400000 (4mm/sec). The default is 500000 (400000 for 8900) for spectrometers and 400000 for stage axes.
Line 21 (JEOL backlash)
50000 50000 50000 50000 50000 -5000 -5000 5000 "JEOL Backlash"
The JEOL backlash values are for restoring the spectrometer and stage backlash values after they have been turned off for special operations. Currently only used for the auto-focus. The values must be specified in units of 1/100th micrometers. The defaults are 50000 (500um) for spectrometers and –5000 (-50um) for X and Y and 5000 (50um) for Z. Must be between 100 and 100,000.
Line 22 (SX100 and SXFive motor velocities)
5000 5000 5000 5000 2000 2000 2000 "SX100 velocities"
The SX100 and SXFive velocities are used to restore spectrometer and stage speeds to normal operating speeds after they have been reduced for special operations. Currently only used for spectrometer scanning for peaking and “quick” spectrometer scanning. Must be between 1000 and 4000 for spectrometers and between 500 and 15000 for X and Y stage motors and between 1 and 200 for the Z stage motor. The defaults are 3000 for spectrometers, 10000 for X and Y stage axes (this is slightly slower than the OEM default) and 50 for the Z stage axis.
Note: SX100 Z speed range is between 10 and 200, and SXFive Z speed range is between 1 and 10.
Line 23 (SX100 minimum speeds)
0 0 0 0 0 0 0 "SX100 minimum speeds"
The SX100 minimum speeds are used to determine how slow a spectrometer or stage motor can be driven. At this time, only the spectrometer ROM scanning is affected by this parameter. Note that some spectrometers will scan at very slow speeds down to 5 steps per second, while some spectrometers will only scan as low as 20 steps per second.
The default is 10 for spectrometers (must be between 2 and 1000) and for stage axes the default is 100 for X and Y and 5 for Z (must be between 10 and 1500 for X and Y and between 2 and 100 for Z).
Line 24 (not used at this time)
0 0 0 0 0 0 0 "unused"