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DOM Main PCB Testing

This testing process focuses on various subsystems of the PCB, including power supplies, communication front end, ATWD configuration, pressure and power monitoring, temperature monitoring, PMT front end, test pulser, and more. The testing covers power supply shorts, voltages, input current, configuration loading, system tests, hardware troubleshooting, additional tools, commissioning tools, and higher-level tests.

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DOM Main PCB Testing

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  1. DOM Main PCB Testing Gerald Przybylski October 23, 2002 Lawrence Berkeley National Laboratory

  2. Subsystems • Power supplies • Communications front end • DACs for ATWD config, etc. • ADCs for Pressure and power monitoring • Temperature monitor (digital) • PMT Front End • Test Pulser • PMT HV ADC, DAC, and enable control • Local Coincidence • Serial number readout; Differentiation; Defaults

  3. Basic Test • Power supply shorts- to each other - to ground. • Power supply voltages - test points provided • 100V DC-DC Converter Input current • Derived power supply currents

  4. Configure for Testing • Load PLD via JTAG • Load CPU via JTAG • Load Configuration Memory via JTAG- Boot file and basic FPGA configuration file- Basic System Test Program(s)- Software tools for hardware testing • Load Flash via JTAG- Default Settings for DACs etc.- Identity (Given Name, Production Lot, etc.)- Test Application- Default FPGA Configuration File • Talk to CPU via RS-232, and run subsystem tests

  5. Basic System Test (Programs) • Memory Test • FPGA Download • DAC Load • ADC Readout (housekeeping) • Local Coincidence Loop-back test • Pulse and read FADC • Pulse and read ATWD

  6. Line Tests • Receive data over twisted pair • Transmit data over twisted pair • Time-stamp and Digitize Leading Edge

  7. Test Resources & Troubleshooting Tools • Poke single FPGA or PLD register • Peak single FPGA or PLD register • Vector read of single FPGA address • Vector read of range of FPGA addresses • Wait for event (e.g. bit set/clear or interrupt) • Set DAC, and PMT HV • Read ADC, PMT HV, and Temperature

  8. Additional Tools • Store FPGA configuration(s) to flash file • Load any FPGA configuration from flash • Forth interpreter

  9. Commissioning Tools • Inquire the System Serial Number • Assign A or B type (differentiation) • Assign Given Name • Assign Start-up Defaults • Flash File System Management tools • Inquire configuration • Execute Self Test Application

  10. Higher Level Tests (1) • ATWD Pedestal Pattern • ATWD Span Calibration (gain) • ATWD A and B Cross Calibration • Synchronous Peak-to-Valley Ratio • PMT Transit Time and Transit Time Spread • Discriminator Threshold Sweep

  11. Higher Level Tests (2) • RAP Cable Length Measurement • Crystal oscillator drift & fluctuations The devil is in the details…

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