Agilent Technologies 35670-90066 manual Bnc, Cpu, Nvram

Agilent 35670A	Circuit Descriptions
	Overall Instrument Description

	Overall Block Diagram
	The following figures show the overall block diagrams for both the two channel and
	the four channel analyzer. Each block in the diagrams represents a functional block in
	the analyzer. The assembly that performs the function is listed in the block.
BNC	Contains the BNC connectors for both input channels and the source. For the four channel
	analyzer, the BNC assembly contains the BNC connectors for all four input channels. Both
	BNC assemblies filter the input channels HIGH (BNC center conductor) and LOW (BNC shell)
	input signals to reduce noise at the inputs.
Input	Buffers, attenuates, amplifies, and filters the input signals. The input assembly also provides
	common mode and differential overload detection, and half-range detection. The two channel
	analyzer contains one A1 Input assembly and the four channel analyzer contains two A2 Input
	assemblies.
Analog	Converts the input signals from the Input assembly (or assemblies) to digital data. The Analog
	assembly also converts the digital data from the Digital assembly’s digital source to the analog
	source signal. For the two channel analyzer, the analog source signal is routed to the Rear
	Panel assembly and to the BNC assembly. For the four channel analyzer, the analog source
	signal is routed only to the Rear Panel assembly.
Digital	Prepares the digital data from the Analog assembly for the CPU assembly. This assembly also
	generates the digital source data for the Analog assembly.
CPU	Controls the analyzer. The following is a partial list of the operations it performs:
	• Configures the assemblies
	• Controls the Disk Drive assembly
	• Controls the Display assembly
	• Initiates the power-up sequence and calibration routine
	• Processes digital data from the Digital assembly
	• Computes the Fast Fourier Transform (FFT)
	• Monitors for a keystroke
	• Monitors the assemblies for overloads or other error conditions
	• Runs the self tests
DC-DC Converter	Generates the driver supply voltages for the Display assembly.
Display	Offers a view of the processed data. See the description of the Display Controller for the “A7
	CPU” later in this chapter for further details.
Memory	Contains RAM, NVRAM, ROM, and the battery-backed real time clock for the CPU assembly.
NVRAM	Provides the CPU assembly with additional NVRAM. This assembly is optional.
Disk Drive	Stores and retrieves information on 3.5-inch flexible disks.
Keyboard Controller	Tells the CPU assembly which key was pressed.
Primary Keypad	Consists of hardkeys and an RPG.

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