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MFC-3045
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User’s Manual
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The indicator “Relative measurement tolerance [ppm] ± :” shows the required tolerance of
the Probe Array. A value of ± 0.20 ppm is recommended, which means that all the residual
errors, (magnetic field value (BFV) - target field value), should be in a 0.4 ppm peak-to-peak
range. If the measured variations amongst all probes are less than this number, the probe
array is considered to pass the normalisation. In this case, the status message in the "Data"
window will display PASS (NOT FINISHED)," or, once all the probes have been measured,
"PASS." If the measurements diverge more than this tolerance, the message "OUT OF
TOLERANCE" will be displayed. This indicator can be modified whenever the user wants,
even after the beginning of the normalisation process.
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It is possible to rearrange the order in which the probes are measured by pressing the
“Change measurement order :” button. The window shown on Figure 21 is then opened.
This step is clearly optional. It is used only when, to facilitate the normalisation process,
measurements are performed in a sequence different from the normal numbering of the
probes (corresponding to the Number displayed on the positioning guide for each position).
The left column of the table corresponds to the sequence of measurements of the
normalisation process. The right column is the probe number associated with the
measurement number. To edit the table, click on a probe number that should be modified
and enter a new probe number.
The "Default" button allows the entire table to be reset to its default setting, where the probes
numbers correspond to the measurement sequence.
The "Cancel" button will discard the modification and exit the window. When clicking on the
"Done" button, the probe order is memorized, and the normalisation as well as the
verification will be done with that order. The measurement order is saved with the other
WMFCTOOL settings. That means that when WMFCTOOL is started again, the previous
measurement order is restored. However, it should be checked.
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The buttons "Load" and "Save" are used respectively to load in WMFCTOOL a previously
saved measurement sequence and to save a measurement sequence in a file.
Figure 21 : Probe measurement order window
6-4-3-1
Normalisation of the Probe Array
During the normalisation process, each probe of the array will be measured at the same position in
the magnet.
The Probe Array normalisation window is very similar to the main measurement window. On the left
side, the “Current measurement” part is an indicator showing the next probe to be measured. The
virtual LED located in this indicator has the same function as the "Busy" LED on the Remote Control
Box – it is red to indicate when the system is measuring, which means that the Probe Array must not
be moved.
In the section on the right, “Data,” the first column in the the main table shows the probe numbers in
the sequence defined in the Probes Order window. The second column shows the correction values
for each probe, displayed in decihertz [dHz] (this is, in fact, the correction table stored in the Probe
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METROLAB Instruments SA