Teledyne 100AH instruction manual 4 V/F Board, Front Panel

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

The M100AH is a true computer based instrument. The microprocessor does most of the instrument control functions such as temperature control, and valve switching. Data collection and processing are done entirely in the CPU with the final concentration values being sent to a D/A converter to produce the instrument analog output.

The computer memory is divided into 3 sections: EPROM memory contains the multi-tasking operating system code plus the instructions that run the instrument. The RAM memory is used to hold temporary variables and current concentration data. The EEPROM memory contains the instrument set-up variables such as range and instrument ID number. The EEPROM data is non- volatile so the instrument can lose power and the current set-up information is preserved.

4.2.4 V/F Board

Computer communication is done via 2 major hardware assemblies. These are the V/F board and the front panel display/keyboard.

The V/F board is multifunctional, consisting of A/D input channels, digital I/O channels, and analog output channels. Communication with the computer is via a STD bus interface. The computer receives all of the instrument data and provides all control functions through the V/F board.

4.2.5 Front Panel

The front panel of the M100AH is shown in Figure 2-4.The front panel consists of a 2 line display and keyboard, 3 status LED's and power switch. Communication with the display, keyboard, and status LED's is done via the computer's on-board parallel port. The M100AH was designed as a computer controlled instrument, therefore all major operations can be controlled from the front panel display and keyboard.

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