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Teledyne API T703 Calibrator Operation Manual Theory of Operation
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9.2.2.1. Disk On Module (DOM)
The DOM is a 44-pin IDE flash chip with a storage capacity up to 256 MB. It is used to store the computer’s
operating system, the Teledyne API firmware, and most of the operational data. The LEDs on the DOM indicate
power and reading/writing to or from the DOM.
9.2.2.2. Flash Chip
This non-volatile memory includes 2MB of space and is used to store calibration data and to store a backup of
the calibrator’s configuration as created during final checkout at the factory. Separating these data onto a less
frequently accessed chip significantly decreases the chance of those key data getting corrupted.
In the unlikely event that the flash chip should fail, the calibrator will continue to operate with just the DOM.
However, all configuration information will be lost, requiring the unit to be recalibrated.
9.2.3. RELAY PCA
The relay board is one of the central switching and power distribution units of the calibrator. It contains power
relays, valve drivers and status LEDs for all heated zones and valves, as well as thermocouple amplifiers, power
distribution connectors and the two switching power supplies of the calibrator. The relay board communicates
with the motherboard over the I
2
C bus. Its status indicators and components can be used for troubleshooting
power problems and valve or heater functionality.
Generally, the relay PCA is located in the right-rear quadrant of the calibrator and is mounted vertically on the
backside of the same bracket as the instrument’s DC power supplies, however the exact location of the relay
PCA may differ from model to model (see Figure 3-5.)
07223B DCN6378