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4.2.1 Examine a Trace
(38) Selectable Trace Strips and Definitions
• X, Y, Z
These strips are identical to those on the Front Panel Display. These traces are the weighted average of the
ambient magnetic field value at the probe location following baseline offset acquisition and HF filtering, and are
displayed in µT (microteslas, 1µT=10 mG). The scale is auto-ranging. The X,Y,Z traces auto-scale based on the
highest reading within the 60 second sample period across all displayed X,Y,Z traces.
• Main X, Main Y, Main Z
These strips show the output values of the Main channel’s A/D converters, offset corrected for averaged
acquired baseline, and scaled to match probe scale factor. The resulting plots represent the absolute values of
the peak averaged interfering magnetic fields in each axis corresponding to probe voltage variations at the
Main inputs.
• Aux X, Aux Y, Aux Z
These strips show the output values of the Aux channel’s A/D converters, offset corrected for current baseline,
and scaled to match probe scale factor. The resulting plots represent the absolute values of the peak averaged
interfering magnetic fields in each axis corresponding to probe voltage variations at the Aux inputs.
• PEM X, PEM Y, PEM Z (Parameter Extraction Module) scaled A/D values
These strips show the output values of the Parameter Extraction Module A/D converters, representing the
current measured by the individual Hall Effect Sensors for the three sense channels. PEM values are used in
the ACR compensation calculation for probe offset compensation.
• Drive X, Drive Y, Drive Z
These strips show the input values of the Drive channel’s D/A converters. These represent the voltage applied
on the three Coil Driver Outputs.
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39
40
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Figure 11. MACS/D Trace Page
