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Combining several test waveforms of different types (1) and running these test over the entire DUT's operating temperature range allow to achieve good confidence that the product's PSU will not fail in the field because of "misbehaving" power supply. Furthermore, these tests are extremely useful to detect hardware design errors or more subtle situations like the one described in [https://www.st.com/resource/en/application_note/an5861-stpmic1-auto-turnon-stmicroelectronics.pdf this application note] by ST Microelectronics. Thank to the use of PPSU, during the qualification of the [[ETRA SBC/General Information/Block Diagram and Features|ETRA Single Board Computer]], we were had been able to spot the issue illustrated in this application note before STM released it publicly. == Hardware design ==PPSU is implemented in the form of a single PCB that can operate in two modes:* PPSUv2* PPSUv3.The following image shows the PCB. It integrates several sections whose purpose will be clear after illustrating the operating modes.[[File:PPSU3-PCB.png|center|thumb|600x600px]]PPSUv2 is the legacy mode utilized when it works in tandem with a PC. In this case, the PC hosts the programs required to "depict" the desired supply voltage.