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judgments can be made on their results. Using a child s toy to measure the thickness of a lead frame is obviously silly, but attempting to fix a plating line problem for solderability using tweezers and a solder pot falls into the same category just silly! 42.3.2 Gauge Repeatability and Reproducibility (GR&R) and Measurement System Analysis (MSA) Background The first evolutionary step was the use of Gauge Repeatability and Reproducibility (GR&R) testing that took into account both the suitability of the test equipment as well as the operator/technician/engineer performing the test. Detailed worksheets were created by the likes of IBM and it became commonplace to speak of a gauge with a 10 percent GR&R rating being very acceptable for its task, with minimal negative influences imparted by the person conducting the test.A gauge with values between 10 and 30 percent was said to be acceptable, and anything above 30 percent required immediate attention to determine whether it was the piece of equipment, the operator, or the interaction between the two that was producing such unacceptable results. Solderability testing by dip and look methods do not meet this minimum requirement. The science of GR&R has since evolved into Measurement System Analysis (MSA), where GR&R is only one part of a system that evaluates the total measurement capability. MSA is an experimental and mathematical method of determining how much the variation within the measurement process contributes to overall process variability. It takes into account

Fig 130: A model of the ion beam machining/sputtering process [1]

Bias The difference between the observed value and reference value. Stability The total variation in the measurements obtained with a measurement system, on the same master or parts, when measuring a single characteristic over an extended time period. Repeatability The variation in measurements obtained with one measurement instrument when used several times by an appraiser; all while measuring the identical characteristic on the same part. Reproducibility The variation in the average of the measurements made by different appraisers using the same measuring instrument when measuring the identical characteristic on the same part. Linearity The difference in the bias values through the expected operating range of the gauge.

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All of these requirements can be attributed to solderability testing, even though at first glance it would appear to have nothing to do with it. Being able to test to a protocol that meets the previous requirements provides useable data for process development and improvement and hopefully will facilitate a much shorter development time than might otherwise be the case. Classic solderability testing, using dip and look techniques, cannot meet any of the previous requirements. 42.3.3 The Wetting Balance and Measurement System Analysis (MSA) For solderability testing there is only one method that has the potential to meet the requirements of MSA and that is testing by wetting balance. Not all wetting balances are, of course, created equal and the ease of use, or lack there of, can have a serious impact on the final MSA analysis and ultimate acceptance of the data. Part of the problem in previous evaluations of the wetting balance has been the samples used for testing the performance of the machine.Typically, with GR&R or MSA, samples are tested repeatedly by numerous people in a random order. When testing with a wetting balance, soldering a part is required. This means that it is a one use item that cannot be tested again. Testing components clearly is not an option, as the natural variation from a plating process (assuming it is one that is in control), may contribute enough variation to fail the evaluation. To get around this one-time test, the solution has been to place known weights that are calibrated and certified on to the wetting balance (which is measuring force as a function of displacement of a sensor) and then record the force measurement as a function of the weight applied. Calibrated weights in the range of 100 milligrams to 5 grams were used

timeout period (called power-on reset period), the processor starts executing program memory code. Figure 5.14 illustrates the simplest reset circuit using just a capacitor and a shunt switch for external reset. The reset pin of the AVR processor has an internal resistor of about 100Kohm value between the reset pin and the Vcc supply voltage pin, and so any external resistor is not required. The capacitor is required to debounce the switch when it is pressed and released. Figure 5.15 illustrates the signal on the reset pin of an AVR processor when the power is switched on. The processor is executing a program to generate pulses on the PORTB pins. The PORTB pins start pulsing after about 15 ms after the reset signal deactivates. This compares well with the datasheet specification for the timeout delay of 16 ms typically. If the power supply voltage rises too slowly, then the rest can be extended by holding the external reset pin low for a longer time. This can be done by choosing either a large time constant RC circuit connected to the RESET pin or using an external reset. If the power supply rises too slowly, the internal reset circuit may not be able to produce the proper system reset. An external reset generator circuit, often called a supervisory circuit, is useful for such needs. Some of the popular supervisory circuits are listed below. Some of them offer additional functions as well.

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