Principles of Operation Teledyne API T703/T703U Calibrator Operation Manual
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reports results using specialized firmware developed by Teledyne API. It
communicates with the user as well as receives data from and issues commands
to a variety of peripheral devices via a separate printed circuit assembly called the
motherboard.
The motherboard is directly mounted to the inside rear panel and collects data,
performs signal conditioning duties and routes incoming and outgoing signals
between the CPU and the calibrator‟s other major components.
Data are generated by the various sub components of the T703 (e.g. flow data
from the MFCs, O
3
concentration from the photometer). Analog signals are
converted into digital data by a unipolar, analog-to-digital converter, located on
the motherboard.
A variety of sensors report the physical and operational status of the calibrator‟s
major components, again through the signal processing capabilities of the
motherboard. These status reports are used as data for the concentration
calculations and as trigger events for certain control commands issued by the
CPU. They are stored in memory by the CPU and in most cases can be viewed
but the user via the front panel display.
CENTRAL PROCESSING UNIT (CPU) 9.2.2.
The unit‟s CPU card (Figure 9-4) is installed on the motherboard located inside
the rear panel. It is a low power (5 VDC, 720mA max), high performance, Vortex
86SX-based microcomputer running Windows CE. Its operation and assembly
conform to the PC-104 specification.
Figure 9-4: CPU Board Annotated
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