Appendix 7 Unstable Measured Values
A17
Appendix
The following five methods may be used to counteract this issue:
1. Move the metallic object father away.
2. Twist the SENSE A and SENSE B lines together.
Doing so will make the lines more resistant to the effects of the eddy current.
3. Twist the SOURCE A and SOURCE B lines together.
Doing so will inhibit the generation of an eddy current.
4. Increase the delay setting.
Doing so will delay the start of measurement until the eddy current has dissipated.
5. Reduce the measurement speed.
Averaging data from the start of measurement, when the effects of the eddy current are
more pronounced, can reduce those effects.
Figure. 8 Generation of an eddy current
Figure. 9 Variations in the Detected Voltage Due to Eddy Currents
a. When Affected by an Eddy Current b. When Not Affected by an Eddy Current
SOURCE B
SENSE B
SENSE A
SOURCE A
between SOURCE A and SOURCE B between SOURCE A and SOURCE B
between SENSE A and SENSE B
between SENSE A and SENSE B
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