User`s manual

7800 Series Hysteresisgraph System User's Manual
4-12 Operation
4.1.5 MEASURE MENU
The Measure menu consists of two selections. The Run One Sample menu selection is described in Paragraph
4.1.5.1. The Run Sequence menu selection is described in Paragraph 4.1.5.2. These selections are available in
both Supervisor and Operator Modes.
4.1.5.1 Run One Sample
Parts of the Run One Sample dialog box change when a different Sample Geometry is selected. The common
parts of the dialog box are described below. However, the Sample Geometry part of the dialog box changes as
different types of cross section are selected.
Sample Geometry and Dimensions are values which are used to determine the B field generated by the sample
magnet. The use of sensing coils in the measurement process defines the process as ‘area dependent.’ The
greater the cross-sectional area of the sample, the greater the measured flux. To correctly interpret this flux, an
accurate determination of the cross-sectional area of the sample must be made. Any error in the measurement
of a cross section parameter directly influences the error of the measurement. For Rectangular Cross Section,
refer to Paragraph 4.1.5.1.1. For Circular Cross Section, refer to Paragraph 4.1.5.1.2. Finally, for Complex
Shape/Manual Cross Section, refer to Paragraph 4.1.5.1.3.
Sample: For information only. Field provided for user defined entry.
File Name: Enter the filename that will store the results of the measurement. Use the .HYS extension.
Comment For information only. Field provided for user defined entry.
Reference: For information only. Field provided for user defined entry.
Lot: For information only. Field provided for user defined entry.
Pulse Magnetized: This box is for information only. It details if the sample was ‘pre-conditioned’ and
provides space for customer comment.
Path: Standard Windows file navigation to specify the destination of the measurement.
Cancel Cancel measurement.
Reset Integrators (Continue): Pressing the Reset Integrators button will cause the Model 480 Fluxmeter
units to reset their integrating stages. This is done to generate a zero reference level for the
process which follows—usually a measurement or calibration cycle. The Reset Integrators
button should only be pressed when the sensing coil of interest is far from non-periodic
electromagnetic noise sources. This allows for a more accurate zero. After the operating cycle
is complete, the sensing coil should be returned to this same point for the Drift Check process.
By placing the sensor at the same point as in the Reset Integrators operation, the Zero
reference point and the Drift Check point should have the same level of noise. Accumulated
drift is the difference in integrator output between the initial zeroing and the drift check. There
will always be some integrated drift. Performing the Reset Integrators function and the Drift
Check function properly ensures that only true drift is measured by this process.