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mLine 52:
Line 52: − − ==== Acquisition Method and Efficiency ====
→Acquisition Method and Efficiency
=== Data Acquisition ===
=== Data Acquisition ===
A Tektronix TDS 2024 (2Gsmp/s, 200MHz) is used to acquire the SiPM signal from its [[SiPM_Amplifier|preamplifier]], the response of which is well understood based on detailed [[MATLAB amplifier in detail|analysis and simulation]]. Since tens of thousands of waveforms are necessary to construct a clean histogram of collected charge, a fast PC based data collection system was necessary. The data export module installed on this oscilloscope allows RS-232 interface over which commands can be issued and data transfer requested. Unfortunately going above the baud rate of 9600 always resulted in lost bytes. At 9600 the 2500-sample waveform collected by the oscilloscope takes about 2-3 seconds to transfer. Since we are dealing with time windows of 1μs in which the unit is too slow to collect all 2500 samples (it was found to copy or interpolate between actual samples) it was resolved to just collect the first 1000 samples, corresponding to the first 4 divisions on the screen. The waveforms now trickled at one per second.
A Tektronix TDS 2024 (2Gsmp/s, 200MHz) is used to acquire the SiPM signal from its [[SiPM_Amplifier|preamplifier]], the response of which is well understood based on detailed [[MATLAB amplifier in detail|analysis and simulation]]. Since tens of thousands of waveforms are necessary to construct a clean histogram of collected charge, a fast PC based data collection system was necessary. The data export module installed on this oscilloscope allows RS-232 interface over which commands can be issued and data transfer requested. Unfortunately going above the baud rate of 9600 always resulted in lost bytes. At 9600 the 2500-sample waveform collected by the oscilloscope takes about 2-3 seconds to transfer. Since we are dealing with time windows of 1μs in which the unit is too slow to collect all 2500 samples (it was found to copy or interpolate between actual samples) it was resolved to just collect the first 1000 samples, corresponding to the first 4 divisions on the screen. The waveforms now trickled at one per second.