December, 2016


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Self-Configuring Sensors for Machine Monitoring


Continued from page 48 Reconfiguration, if required,


can be performed in a matter of min- utes. A highly linear output signal is achieved internally using digital lin- earization techniques. Temperature compensation of the output signal, desirable to minimize measurement temperature effects, is performed by the internal microprocessor and can be easily set up by the user, in many cases in-situ. The digiVIT has user-program-


mable functions including relay set points for out-of-tolerance or process control indications, digital low pass fil- tering to improve resolution, an adjustable sensor sample rate, and quick two-point adjustment instead of full calibration when replacing broken sensors. The digiVIT is suitable for applications requiring precision and ease of use at a reasonable price. Examples of customer uses include:


Metal Stamping Process. In this metal stamping process, the cus- tomer’s feed stock needed to be checked for straightness and flat- ness. The metal type was changed several times a day. Eddy current technology was suitable for the oily machine environment, but required recalibration to each different type of metal, which was too time-consum- ing. With the digiVIT, recalibration took a matter of minutes, making the measurement practical.


Assembly Machine Calibration. For this customer, monthly sensor cal- ibration was required for quality con- trol purposes. The sensors were locat- ed far from the signal conditioner making calibration of analog sensors difficult and time-consuming. Repla - cing the analog systems with a digiVIT signal conditioner required only a two-point calibration adjust- ment, reducing calibration time signif- icantly.


Paper Thickness Measuring. This customer combined a digiVIT with a


Reducing the PCB Bone Pile


Continued from previous page


important for an application, the required diagnostics resolution or how accurately a given fault can be pinpointed. This determines the types of hardware needed and the software programs to support it. Better resolution requires more instrumentation and also (usually) more test points. However, the latter can be mitigated by the use of JTAG/boundary scan techniques on designs that support this technology. Since JTAG/boundary scan uses


built-in pin access provided by the ICs themselves, hardware overhead can be reduced by removing test points while increasing test coverage and adding useful resources such as in-system programming of CPLDs, flash devices and the embedded memories in microprocessors. Contact: JTAG Technologies,


Inc., 111 N West Street, Suite A, Easton, MD 21601 % 410-770-4415 fax: 410-770-4774 E-mail: info@jtag.com Web: www.jtag.com r


laser and performed a special cali- bration over a limited range to opti- mize resolution. Digital filtering and in-situ temperature compensation were enabled to further improve per- formance. The digiVIT proved easy for the customer to implement. Kaman’s digiVIT allows users to


work with a wide variety of measuring system configurations and operate in many conditions. For applications where high performance is a must, this new digital signal conditioner technology is an attractive option. Contact: Kaman Precision


Products, 217 Smith Street, Middletown, CT 06457 % 860-632-4536 Web: www.kaman.com r


Post-Reflow Acoustic Micro Imaging


Continued from page 51


tor — gating was limited to the back surface of the capacitor. No reflected echoes are collected from the body of the capacitor. Instead, the pulses are reflected from the back surface and display any cracks they encounter on the way back to the transducer. The cracks are imaged as highly visible acoustic shadows. The red arrows in Figure 3 show two cracks imaged in this way. There is a possible small crack in the lower left of the upper capacitor. When problem solving requires


additional diagnostic information, Sonoscan has developed numerous imaging modules that can be used without removing the components


from the board. The Quantitative B- scan Analysis Mode (Q-BAM™) tech- nique can be used to nondestructively cross-section a component through any vertical plane. The Time Do main™ mode can be


used to zero in on fine details of struc- tural defects. The PolyGate™ mode can be used to image a component in thin non-destructive slices. Without removing the components from the board, a great deal can be learned about structural defects and their causes. Contact: Sonoscan, Inc., 2149 E


Pratt Boulevard, Elk Grove Village, IL 60007 % 847-437-6400 fax: 847- 437-1550 E-mail: info@sonoscan.com Web: www.sonoscan.com r


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