hw:lab:spectrochain:script
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hw:lab:spectrochain:script [2009/09/15 07:47] szymon.kulis |
hw:lab:spectrochain:script [2019/03/08 14:08] (current) |
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| ==== Observing the preamplifier output ==== | ==== Observing the preamplifier output ==== | ||
| - | Select 0 as an active output. Try to find output pulse on oscilloscope. Set time base of oscilloscope to 400ns. Does signal look like voltage step? Try to estimate charge gain given by <latex> K_u = \frac{V_{out}}{Q_{in}} </latex> (having in mind formula "charge adapter") and compare it with formula "x". | + | Select 0 as an active output. Try to find output pulse on oscilloscope. Set time base of oscilloscope to 400ns. Does signal look like voltage step? Try to estimate charge gain given by <latex> K_u = \frac{V_{out}}{Q_{in}} </latex> (having in mind formula "charge adapter") and compare it with value given by formula X ref wzmocnienie pream X. |
| Try to look mode deeply on the pulse head (change time base to 40ns). How would you explain the non zero rising time? Then look at the pulse tail. Try to estimate time constant of this pulse and compare it to "y". | Try to look mode deeply on the pulse head (change time base to 40ns). How would you explain the non zero rising time? Then look at the pulse tail. Try to estimate time constant of this pulse and compare it to "y". | ||
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| ==== Linearity check of pre amplifier ==== | ==== Linearity check of pre amplifier ==== | ||
| - | Perform the measurements of output pulse amplitude at the preamplifier output for the set of input test pulse amplitudes. The obtained results write to file ''preamp.dat'' in following format: | + | Perform measurements of pulse amplitude at the preamplifier output for the set of input test pulse amplitudes. The obtained results write to file ''linearity.dat'' in following format: |
| <code> | <code> | ||
| #vin[mv] vout[v] | #vin[mv] vout[v] | ||
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| Look at the first shaper stage output. Check whether the displayed time is equal to the peaking time (time after which pulse reaches its maximum). Look at the pulses at the outputs of subsequent stages. Find their peaking times and see how they are related to the shaping time constant. Try to set the same peaking times for different shaping orders and compare the pulse shapes. | Look at the first shaper stage output. Check whether the displayed time is equal to the peaking time (time after which pulse reaches its maximum). Look at the pulses at the outputs of subsequent stages. Find their peaking times and see how they are related to the shaping time constant. Try to set the same peaking times for different shaping orders and compare the pulse shapes. | ||
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| ==== Noise performance ==== | ==== Noise performance ==== | ||
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| To analyse the measured data use script ''noise.gnu''. See the results in the file ''noise.png''. Are you able to show the optimum shaping time for each filter order ? Does it pay off to use higher shaper orders for noise reduction ? | To analyse the measured data use script ''noise.gnu''. See the results in the file ''noise.png''. Are you able to show the optimum shaping time for each filter order ? Does it pay off to use higher shaper orders for noise reduction ? | ||
| + | ==== Observing pulses from source ==== | ||
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| + | Uda sie zorganizowac zrodlo ? | ||
| ==== Discussions topics==== | ==== Discussions topics==== | ||
| - | * What is main uncertainty source during gain measurements in such setup? | + | * What is main uncertainty source during gain measurement in such setup? |
| - | * During this laboratory we were investigating electronic noises. You have to remember that in real experiments You also have to fight with disturbances. Can You give an example of disturbances in real world ? | + | * During this laboratory we were investigating electronic noises. You have to remember that in real experiments You also have to fight with disturbances. Can You give an example of disturbances in real experiment? |
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