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Model 9110T NOx Analyzer Principles of Operation
Teledyne Analytical Instruments 340
Figure 13-14: CPU Board
The CPU includes two types of non-volatile data storage: a Disk-on-Module (DOM) and an embedded
flash chip.
13.3.2.1. Disk-On-Module
The DOM is a 44-pin IDE flash drive with storage capacity to 128 MB. It is used to store the computer’s
operating system, the Teledyne firmware, and most of the operational data generated by the analyzer’s
internal data acquisition system (DAS).
13.3.2.2. Flash Chip
This non-volatile, embedded flash chip includes 2MB of storage for calibration data as well as a backup
of the analyzer configuration. Storing these key data on a less heavily accessed chip significantly
decreases the chance of data corruption.
In the unlikely event that the flash chip should fail, the analyzer will continue to operate with just the
DOM. However, all configuration information will be lost, requiring that the unit be recalibrated.
13.3.3. MOTHERBOARD
This PCA provides a multitude of functions including, A/D conversion, digital input/output, PC-104 to
I
2
C translation, temperature sensor signal processing and is a pass through for the RS-232 and RS-485
signals.