calibration of the va2 b pal, r mountain, m artuso 6/29/2010 goal: get an absolute calibration of a...
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![Page 1: Calibration of the VA2 B Pal, R Mountain, M Artuso 6/29/2010 Goal: get an absolute calibration of a VA2 channel to measure diamond charge collection](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d2d5503460f94a030a4/html5/thumbnails/1.jpg)
Calibration of the VA2
B Pal,R Mountain,
M Artuso6/29/2010
Goal: get an absolute calibration of a VA2 channel to measure diamond charge collection
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Calibration fixture is replaced by single channel fixture
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Single channel fixture schematic
1.0 pF
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Channel Gain Channel 141 previously used in diamond measurements
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Input Bias
Nominal gain from specs is 30 mV/fC, which is ½ of the gain we measured in ch 141.
Nominal value value Used
Vfp -0.2 to 0.5 V -0.4 V
Vfs 700 mV 700 mV
Pre_Bias 100 mV 99.8 mV
Sha_Bias 22 mV 22.3 mV
i_buf 14 mV 13.8 mV
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Gain vs. I_buf
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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.