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Calibration of the VA2

Goal: get an absolute calibration of a VA2 channel to measure diamond charge collection. Calibration of the VA2. B Pal, R Mountain, M Artuso 6/29/2010. Calibration fixture is replaced by single channel fixture. Single channel fixture schematic. 1.0 pF.

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Calibration of the VA2

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  1. Goal: get an absolute calibration of a VA2 channel to measure diamond charge collection Calibration of the VA2 B Pal, R Mountain, M Artuso 6/29/2010

  2. Calibration fixture is replaced by single channel fixture

  3. Single channel fixture schematic 1.0 pF

  4. Channel 141 previously used in diamond measurements Channel Gain

  5. Input Bias Nominal gain from specs is 30 mV/fC, which is ½ of the gain we measured in ch 141.

  6. Gain vs. I_buf

  7. To do • Calibrate the ADC (have adc/fC now), • Check the gain after ADC calibration , • Fix the diamond holder, • Start studies of “unusual” diamond behavior.

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