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Theory of Operation
Electronics Overview
Electronics Overview
Figure 4 Electronics Block Diagram
The spectrophotometer includes a spectrograph which utilizes a
processor-controlled photodiode array. Several processing steps and
hardware boards are required to form spectra from the intensity counts
derived from the diode array. Full spectra can be acquired, processed and
transmitted every 0.1 s continuously, the only bottleneck being the PC speed.
The instrument has its own onboard real-time clock and this allows the
instrument to perform a series of time-based accessory control actions and
SPM
spectrophotometer processor
main board
SLS
spectrophoto-
meter
lamp supply
board
SDA
spectrophoto-
meter
data acquisition
board
SSI
spectrophotometer
sipper interface
switches
LED
spectrograph
SCI spectrograph
connector interface
PDA
photodiode array
interfaces
MPS
spectrophotome-
ter main power
shutter
fan
deuterium
lamp
tungsten
lamp
line power
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