Gentec-EO QUAD-4Track - Manual (Page 26)

QUAD-4Track User’s Manual Revision 2.1 26
As an example, suppose the Sensor has a diameter of 9mm. The radius will then be
4.5mm, so the algorithm will set this to 4mm. Division by 8 gives 0.5mm. The 9 Set
Positions will then be:
(-2.0,0) , (-1.5,0) , (-1.0,0) , (-0.5,0) , (0,0) , (0.5,0) , (1.0,0) , (1.5,0) , (2.0,0)
Measured Positions
The Measured Position by the DPQ-4 for each Set Position used during the calibration.
Coefficients
The 8 coefficients used in the correction equation.
y(x) = Ax^7 + Bx^6 + Cx^5 +Dx^4 + Ex^3 + Fx^2 + Gx + H
where x is the measured position and y is the calibrated measurement.
Calibrated Positions
The Corrected Position for each measurement.
Operating QUAD-4TRACK with the Applications Software
Plug the power supply and probe into the QUAD-4TRACK instrument. Start the
application software. The software will set itself to the Position Measurement Tab and
initialize contact with the instrument. It will then set itself to the Probe Data tab and read
the required information from the probe. The software will then configure itself for the
ranges appropriate to the probe ands et itself to the Position Measurement tab. The system
is now ready for use.
Getting Ready to Measure Data
The QUAD-4TRACK instrument and applications software provide a versatile high
speed measurement system. It must be properly set up to work well. The following
sections discuss the controls that set up the instrument for measuring data.
Range Setting
The available ranges are dictated by the probe in use. Use the range control to set the
range to a value appropriate for the expected energy. Note that energy values above the
range value can be measured, but accuracy may be reduced. In general, the smallest range
that will contain the expected energy should be used, i.e., if the maximum energy to be
measure is 189μJ, the use the 200μJ range. Note that this energy can be measured in the
2mJ range with a trigger level below 9%, or an external trigger, but more accurate results
will be obtained in the 200μJ range.