Chapter 8: Theory of Operation
Agilent
Agilent 1680A,AD-series Logic Analyzer Theory
PC Motherboard. The Agilent
PC Software System. The user interface and I/O run on the PC motherboard under Microsoft Windows ® 2000 Professional operating system. This is the primary software system. Windows ® 2000 Professional operating system. This is the primary software system. Windows ® 2000 Professional provides all the graphics drivers needed to create the front panel interface as well as providing all of the software necessary to access the disk drives, to drive printers, and to process input from pointing devices and the keyboard. Standard Windows ® drivers are also used for I/O boards installed in the PCI slots and devices connected to LAN, video, and the IEEE 1394 interface.
Disk Drives. The Agilent
Flat Panel Display. The Agilent
Luminance is software selectable at either 60% luminance or 100% luminance. The display’s luminance is controlled from the user interface by sending commands to the IEEE 1394 processor which in turn sends commands to the front panel microcontroller where luminance is controlled. This board plugs into a PCI slot on the PC motherboard and has a cable that drives the display.
An inverter is used to provide power to the two fluorescent lamps that make up the backlight of the liquid crystal display. The inverter’s output voltage is derived from a +12 V input. The inverter is a separate OEM component that is powered from the power distribution board.
A custom SVGA display board plugs into a PCI slot. The SVGA board drives the flat panel display and can also drive a standard external CRT display.
Networking. Networking is accomplished using an OEM board that plugs into a PCI slot.
Other I/O. The parallel port, audio port, keyboard port, mouse port, serial port, and USB ports are all integrated onto the motherboard.
