SX-01635-000, Rev. 5
9
System Description and Operation
There are two basic functions the SC-5500 provides for your integrating sphere system: the
instrument displays the detector output, in either radiometric or photometric units, and exercises
operating control over selected optical instruments. The instrument control function requires use
of a host computer with either a standard Labsphere software package or your own software.
At the heart of the instrument is a Zilog Z180 8-bit microprocessor that performs all data collec-
tion and system control duties. The Z180 chip is an enhanced version of the time-tested Z80
MPU that featuring 1 Mb MMU, two DMA channels and 8 MHz on-chip oscillator. A functional
block diagram of the instrument is provided in Appendix B. The radiometer features two detec-
tor inputs - one for current and one for voltage operation. Voltage signals from both detector
channels are amplified and digitized before providing input to the microprocessor. Data process-
ing commands for the microprocessor are held in system memory by a 8-bit 32K EPROM chip
along with the necessary calibration data for displaying detector readings. The calibration data is
embedded into the EPROM at Labsphere and provides accurate readings only when used in the
configuration specified by the calibration documentation.
Automatic or manually controlled ranging is provided for each detector channel over a control
bus and three gain control networks. The gain network for the detector current channel consists
TALK
LISTEN
REMOTE
FUNCTIONS
CAL
ZERO
NORM
AUTO
OPTIONS
DATA ADJUST
RANGE
INTEGRATING SPHERE SYSTEM CONTROL
SC 5500
labsphere
labsphere
115
V
AC Voltage Input Module
Detector TRIAX Input Connectors
SC-5500 Control Output Port Connector
RS-232 Connector
IEEE Connector
Figure 5. Front and back panels of the SC-5500 instrument.
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