PCB design to determine if it was mounted properly and routed to the correct pins. 6.2.1 Power Testing When testing the DC-DC conversion, the key values to measure are voltage and current. For the all the DC-DC conversions, the voltages should be within five percent of the expected output the Webench design files had an output specification of maintaining within five percent of the desired output voltage ripple. It is important to make sure device is fully functional when all components are turned on. This function will also be tested to make sure the device can run for a minimum of thirty minutes. In Table 19 the voltage and current tests are reviewed that will be performed for the two stages of DC-DC conversion. The time for which the device should be operating for will also be reviewed. A list of steps will be taken when troubleshooting the circuit on the breadboard and PCB as well. First will be checking the circuit to ensure that it has power being supplied to it. This is easily done using a multimeter set to a voltage range. Measuring the voltage using a multimter at the points where the supply enters the circuit board will provide a result. If the multimeter indicates that there is no supply voltage then there can be a number of possibilities to investigate. Common errors are that the battery could be flat if the equipment is battery powered. On-off switch faulty is another error, which can be checked by disconnecting any power source and checking for continuity across the switch. The PCB design will require having test points to determine if each mounted piece is receiving the correct voltage. Designing the PCB test points will require placing an open connector hole with a positive and negative terminal. This can be designed in the PCB design software. The test points in the PCB would need to be at least 3.2 mm apart from board edges. This is done to prevent shorting any components in the PCB. Usually inserting the test points on the bottom of the board is an easier design method. Test point sites can be through-hole leads, dedicated pads or small diameter vias. Test points should be evenly distributed over the surface of the board. High stress in congested areas can cause board to warp. Further explanation on how the PCB should be designed for testing will be discussed in the next sections. Table : DC-DC Testing Plan # Description Conditions Expected Results
PCB design to determine if it was mounted properly and routed to the correct pins. 6.2.1 Power Testing When testing the DC-DC conversion, the key values to measure are voltage and current. For the all the DC-DC conversions, the voltages should be within five percent of the expected output the Webench design files had an output specification of maintaining within five percent of the desired output voltage ripple. It is important to make sure device is fully functional when all components are turned on. This function will also be tested to make sure the device can run for a minimum of thirty minutes. In Table 19 the voltage and current tests are reviewed that will be performed for the two stages of DC-DC conversion. The time for which the device should be operating for will also be reviewed. A list of steps will be taken when troubleshooting the circuit on the breadboard and PCB as well. First will be checking the circuit to ensure that it has power being supplied to it. This is easily done using a multimeter set to a voltage range. Measuring the voltage using a multimter at the points where the supply enters the circuit board will provide a result. If the multimeter indicates that there is no supply voltage then there can be a number of possibilities to investigate. Common errors are that the battery could be flat if the equipment is battery powered. On-off switch faulty is another error, which can be checked by disconnecting any power source and checking for continuity across the switch. The PCB design will require having test points to determine if each mounted piece is receiving the correct voltage. Designing the PCB test points will require placing an open connector hole with a positive and negative terminal. This can be designed in the PCB design software. The test points in the PCB would need to be at least 3.2 mm apart from board edges. This is done to prevent shorting any components in the PCB. Usually inserting the test points on the bottom of the board is an easier design method. Test point sites can be through-hole leads, dedicated pads or small diameter vias. Test points should be evenly distributed over the surface of the board. High stress in congested areas can cause board to warp. Further explanation on how the PCB should be designed for testing will be discussed in the next sections. Table : DC-DC Testing Plan # Description Conditions Expected Results