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DC Continuity Test Method Continuity testing checks for the expected continuous path within each electrical network. This is done in a series of point-to-point measurements within each network. The resistance found in each measurement is compared to the selected continuity resistance threshold. If the measured value is higher than this threshold, then a fault report is generated. For complex networks, multiple measurements are required in order to ensure that all extremities of the network are interconnected. For example, the network with test points labeled A through D, shown in Fig. 37.1, could be tested in the sequence illustrated in Fig. 37.2. For a network with four test points, the minimum number of tests would be three to determine whether all points are connected. If a board contains a total of N isolated networks, and contains a total of X test points, we may calculate the number of continuity measurements C as C = X N. In assigning test points, the software system often is programmed to delete those that are unnecessary. This is referred to as test point optimization. In Fig. 37.1, a test point located along the path between D and the branch to C would not be useful. Various optimization rules may be applied, but should be applied with care to ensure that adequate test coverage remains in place. qr code generator excel mac QR code generator for Excel free VB macro - YouTube
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Barcode software for Excel 2016 & Excel 2013 ✓ For Users & Developers ... this to any barcode type supported by ActiveBarcode: QR Code , GS1/EAN-128, Data ... 37.3.1.1 Continuity Test: Two-Wire versus Four-Wire Switching. Switch matrixes are constructed using either two-wire or four-wire circuits. A diagram (continued) qr code excel generator Barcode in Excel
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QR Code Barcode Add-In on Microsoft Excel , to add, create and draw QR Code barcodes in Microsoft Excel 2007 spreadsheets. comparing a single continuity measurement being performed on both two-wire and four-wire matrixes is shown in Fig. 37.3. Grid test systems use solid-state switches to connect appropriate test points to an internal measurement system (which is effectively an ohmmeter). Current I is driven from the upper test point through the product network and returned to the measurement system through the lower test point. The resultant voltage V across the network is measured. The continuity resistance R is then determined using the relationship R = V/I. 37.3.1.2 Two-Wire Switch Matrix Construction. The simplest, most affordable, and most common construction of the switch matrix is to have a pair of switches for each test point that can connect the test point to either the high side or low side of the ohmmeter. This technique is illustrated on the right side of Fig. 37.3. However, as the solid-state switches exhibit a certain amount of on-resistance, they contribute error to the measurement. The resistance of the switches is added to the resistance we measure, increasing the likelihood of failing the test. These errors can be reduced in various ways: qr code barcode excel add-in How to create qr code based on cell value in Excel ? - ExtendOffice
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Aug 22, 2018 · And finally press the Alt + Q keys to exit the Microsoft Visual Basic for Applications window. VBA code: Create QR code in Excel ... At this point, it really doesn t matter which method you choose, so long as ValidIncomeLevelView is a view object that defines the list of possible values. Use switches with low on-state resistance (and thus a FIGURE 37.2 Continuity test algorithm. small amount of variation in on-resistance). This means using physically larger transistor dies. Such devices are not expensive, but are harder to integrate into integrated circuits. Thus, most two-wire designs rely upon discrete output transistors as switch elements. Use software to subtract the estimated typical on-resistance. As switch resistance effects vary from device to device, and change with temperature, some error remains. Make multiple measurements for each continuity to be inspected, and mathematically subtract most of the switch resistance. However, this slows the measurement process somewhat by requiring extra measurements and requires high-quality fixture construction such that contact resistances do not vary during the required multimeasurement sequence. Attempt to learn the resistance of each switch. Some systems require the operator to install a shorting plate over all test points, and the system then learns the sum of the switch resistances plus contact resistances to this plate. Note that this technique can actually add error if a high contact resistance value is learned for a particular test point, perhaps due to dirt on a probe. The excessive resistance value learned is subtracted from all subsequent measurements made with that probe, masking some high product resistances. The net result is a slightly increased possibility of passing a board that should be failed. 37313 Four-Wire Switch Matrix Construction The left side of Fig 373 represents a Kelvin or four-wire switch matrix construction Notice that each test point will require four switches, so that any test point can be connected to the high-side current drive, high-side voltage sensor, low-side voltage sensor, or low-side current return via separate paths Because the voltage-sensing portion of the measurement system has an extremely high input resistance, almost zero current flows through the extra pair of switches that connect the test points to this circuit The result is that there is zero voltage drop across these sense switches, and the measurement unit sees exactly the voltage across the unknown load Because the measurement system knows exactly the current flowing through the load, and exactly the voltage across it, it can calculate the load resistance accurately. The dominant error term in this situation is generally the contact resistances in the fixture and fixture-product interface Also, the smaller transistors leak less current in the off state, thereby permitting isolation testing at higher thresholds with smaller errors The continuity accuracy benefit of this technique is realized only if high-quality fixtures with low contact resistance are employed 37314 Continuity Threshold The continuity resistance threshold parameter is usually specified in the range from a few ohms to 1,000 Several standards useful in suggesting continuity thresholds are summarized in Table 371 IPC-9252 has actually weakened the recommendations of IPC-ET-652, which it replaces As discussed earlier in the chapter, these must be applied with judgment Generally, a lower continuity threshold provides a more stringent test of the board. Program 28-12 Ramp Up/Ramp Down Move with Potentiometer-Controlled Variables (Based on Time Segments, Not Encoder Counts) (continued) qr code in excel free Free Download Excel 2016/ 2013 QR Code Generator. No barcode ...
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