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Comparison of DOMMB Analog Inputs with Different High Voltage Bases

This study compares the noise levels of DOMMB analog inputs with different high voltage bases. The measurements were taken using a Python socket program connected to a terminal server, with an ATWD channel connected to an LED pulser current. The results indicate that all high voltage base configurations introduce some level of noise, with the EMCO base and Old Iseg showing comparable levels of noise and the New Iseg introducing very high levels of noise.

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Comparison of DOMMB Analog Inputs with Different High Voltage Bases

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  1. PMT Base Prototypes Comparison using DOMMB ATWD August 6, 2003 Nobuyoshi Kitamura UW-Madison / SSEC

  2. Method Terminal server connected by Python socket program* ATWD chan3 connected to LED pulser current (analog MUX = 2)* CPU trigger on ATWD#0 and capture data* (*Script by Kael Hanson) The rest was also done with a python script (by NK). Background (baseline measurement) with coax connected to dommb but the ribbon cable removed. 100 samples averaged and stored in a file (tagged with a dom ID). (Only 100 samples because of python program speed) Repeatedly captured waveforms (~1Hz), subtracted baseline and displayed on monitor. At random intervals, captured screen (ALT-”print screen”), and pasted to this document. Ten such screen shots are shown here for each configuration. The vertical scale is the ADC counts. 8/6/2003 N. Kitamura

  3. Samples DOMMB only—stand-alone DOMMB in Chamberlin Hall accessed from PSL. The analog input was shunt with a 100Ohm resistor. EMCO—measured with DAC=0 (HV=0) and DAC=2000 (HV=1000V). Old Iseg—single ground configuration. Measured with DAC=0 and without enableHV(), but the on-board oscillator was always on. New Iseg—the split grounds were bridged with a 1MOhm resistor. In addition, the “clean ground” wire was on. The measurement was done under the same conditions as Old Iseg. 8/6/2003 N. Kitamura

  4. Summary / Conclusion (tentative) Fairly large noise is seen in chan0 even with no HV base connected to DOMMB. (Is this a fair measure of the input channel quality?) All the HV base configurations introduce noise to some extent The EMCO base and Old Iseg add somewhat comparable levels of noise to the channels The New Iseg introduces very high levels of nose 8/6/2003 N. Kitamura

  5. DOMMB only 1 8/6/2003 N. Kitamura

  6. DOMMB only 2 8/6/2003 N. Kitamura

  7. DOMMB only 3 8/6/2003 N. Kitamura

  8. DOMMB only 4 8/6/2003 N. Kitamura

  9. DOMMB only 5 8/6/2003 N. Kitamura

  10. EMCO (dac=0) 1 8/6/2003 N. Kitamura

  11. EMCO (dac=0) 2 8/6/2003 N. Kitamura

  12. EMCO (dac=0) 3 8/6/2003 N. Kitamura

  13. EMCO (dac=0) 4 8/6/2003 N. Kitamura

  14. EMCO (dac=0) 5 8/6/2003 N. Kitamura

  15. EMCO (dac=2000) 1 8/6/2003 N. Kitamura

  16. EMCO (dac=2000) 2 8/6/2003 N. Kitamura

  17. EMCO (dac=2000) 3 8/6/2003 N. Kitamura

  18. EMCO (dac=2000) 4 8/6/2003 N. Kitamura

  19. EMCO (dac=2000) 5 8/6/2003 N. Kitamura

  20. Old iseg 1 8/6/2003 N. Kitamura

  21. Old iseg 2 8/6/2003 N. Kitamura

  22. Old iseg 3 8/6/2003 N. Kitamura

  23. Old iseg 4 8/6/2003 N. Kitamura

  24. Old iseg 5 8/6/2003 N. Kitamura

  25. New Iseg 1 8/6/2003 N. Kitamura

  26. New Iseg 2 8/6/2003 N. Kitamura

  27. New Iseg 3 8/6/2003 N. Kitamura

  28. New Iseg 4 8/6/2003 N. Kitamura

  29. New Iseg 5 8/6/2003 N. Kitamura

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