The tampering was done both orthogonally as well as parallel. Figure 7-7 shows the output from the TMAG5170 GUI when the fraudulent magnet is brought within the detection field of the device. The field strength is approximately 1.75mT on the X-axis until the imposter magnet is brought closer. The introduction of the second magnet increases the field strength on both the X as well as the Y axis, indicating a tamper attempt has occurred.

Figure 7-7 TMAG5170 Orthogonal Tamper Testing Setup

Figure 7-8 TMAG5170 Orthogonal-Axis Magnetic Detection: Results

Again, the tampering test is done, this time parallel to the genuine magnet. Figure 7-9 shows the resulting response from the TMAG5170 when the tamper magnet is brought within detection range. Before the tamper magnet begins the approach, the X axis field strength is approximately 1.1mT. Once the tamper magnet is brought closer, the evidence of tampering attempt can be seen on the Z axis with the field strength again increasing on the X axis due to the additional magnetic field presence.

Figure 7-9 TMAG5170 Parallel Tamper Test: Setup

Figure 7-10 TMAG5170 Parallel Tamper Test: Results