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Appendix A: Technical Overview
121
Pulse Measurements
The pulse travels from the PMTs to the electronics board within the cytometer.
Figure A-16
Electronics board
The pulse is amplified and then sent to a 14-bit analog-to-digital converter
(ADC) that changes the analog (continuous) pulse into digital (discrete) data. The
ADC does this by sampling the pulse up to 10 million times per second, slicing it
into 16,384 levels, and assigning a measurement to each time sample.
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
PMT
preamp
ADC
digital
delay
FSC diode
preamp
ADC
digital
delay
FPGA
digital
signal
processor
digital
signal
processor
workstation
embedded
computer
10,000,000 measurements
per second
measurements digitized
into 16,384 levels (14 bits)
Summary of Contents for FACSCanto II
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