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The value of the capacitor we choose to charge is not critical, but too small a capacitor.

25 C

The rate of temperature cycling should not exceed 20 C/min and the dwell time at the temperature extremes should be at least 5 min. The purpose of controlling the cycling speed is to minimize thermal shock and the stresses associated with differential heating or cooling. The dwell time at the temperature extremes is an absolute minimum needed to permit creep to occur. A longer dwell time is recommended, particularly at the minimum temperature.

As described here, there are several acceleration factors in the literature that may be applied to make life estimations from the accelerated test data that may be obtained using a thermal profile that fits the preceding criteria. One of the simplest expressions is due to Norris and Landzberg: nop Nop = n test Ntest where

Nop and Ntest = life under operating and accelerated test conditions, respectively n = cycling frequency f = mean temperature47

Another widely used expression may be found in IPC-SM-785. This expression tries to account for the effect of power cycling and the dwell time in the thermal profile; it also makes it possible to make predictions for one component or solder joint geometry based on data for another similar one. In its most simplified form, the acceleration factor for tests meeting the preceding criteria for FR-4 and eutectic Sn-Pb solder joints may be approximated as Nop Top2.4 = Ntest Ttest Top4 Nop = Ntest Ttest for leadless surface-mount attachments for compliant-leaded surface-mount attachments

will give us insufficient time for the signals to settle down and too large a capacitor will take too long to discharge. In our particular case, a capacitor of 10 micro farads will give us an answer well within 0.01 seconds. This is fast enough for most purposes. Program 16-1 shows how the potentiometer was read, converted to an 8-bit value, and displayed on the LCD.

assuming the test assemblies are nearly identical to the assemblies that will be put into service. Mechanical fatigue cycling is increasingly being used as a quick way to induce solder joint failures. The goal is to simulate the thermal fatigue failure process in a much shorter test. The validity of this approach is still being investigated; although the imposed strain in each cycle is intended to be the same, the mechanical test eliminates thermomechanical effects (including creep) because the cycles are about two orders of magnitude faster. Nonetheless, mechanical cycling can certainly provide useful comparisons between different designs or package

Now when the user enters a value into the Salary field, the value is immediately submitted when the user moves out of the field and, in this case, an error is displayed stating that the data failed the validation rule.

styles. The tests are usually conducted at a constant temperature with fixturing that puts the solder joints in shear when bending or tensile displacements are applied. 57.6.3.2 Mechanical. Mechanical vibration and shock can cause solder joint failures, particularly for large, rigid components or components with large, heavy heat sinks. Mechanical shock tests are usually modeled after drops that may occur during transportation or use. The test drops are generally quite severe, but few in number, since the system is not expected to be subjected to repeated drops in service. One common test uses a maximum acceleration of about 600 g, a maximum velocity of about 300 in/s, and a shock pulse of about 2.5 ms duration. The test setup is shown schematically in Fig. 57.26.

FIGURE 57.26 Schematic of setup used to test the resistance of printed circuit assemblies to out-of-plane mechanical vibration and shock.

On the other hand, the PCA may be exposed to millions of mechanical vibration cycles during its lifetime.48 Depending on the application, both in-plane and out-of-plane vibration may play an important role. The damage done by these cycles depends primarily on whether the cycling frequency is near a natural frequency of the board, where large deflections can take place. For in-plane vibration, random vibration over a wide excitation frequency range is performed at a constant power spectral density. Most surface-mount components have high natural frequencies, and solder joint failures are rarely observed. For out-of-plane vibration, the following procedure is recommended: