Theory of Operation
TDS 310, TDS 320 & TDS 350 Instruction Manual
53
Display System
A display controller IC processes text and waveforms.
The display system sends the text and waveform information to the monitor
assembly as a video signal. The display system also generates and sends
vertical (VSYNC) and horizontal (HSYNC) sync signals to the monitor assem
bly.
Monitor Assembly
All information (waveforms, text, graticules, and pictographs) is displayed by
the A26 Monitor Assembly. It generates the high voltages necessary to drive
the display tube. It also contains the video amplifier, horizontal oscillator, and
the vertical and horizontal yoke driver circuitry.
Front Panel
The processor system sends instructions to and receives information from the
Front Panel Processor on the Front Panel Board. The Front Panel Processor
reads the front panel switches and ports, and reports any change in their
settings to the processor system. The Front Panel Processor also turns the
LEDs on and off.
The Front Panel Processor reads the front panel menu switches and sends
any changes in menu selections to the processor system. The ON/STBY
button is not read by the Front Panel Processor but passes through the Front
Panel Board and the Main Board to the A20 Low Voltage Power Supply.
The front panel also generates the probe compensation signal.
Communications Option
The A2 Option Board has GPIB, RS 232, and Centronics interfaces for exter
nal control and hardcopy operations. Also included are a VGA video output
port and a power connector for the Option 3P printer.
Low Voltage Power Supply
The A20 Low Voltage Power Supply is a switching power converter. It sup
plies power to all the circuitry in the oscilloscope.
The Low Voltage Power Supply does not have a main power switch. The
ON/STBY switch, located on the front panel, controls all the power to the
oscilloscope except the standby circuits in the Low Voltage Power Supply.
Fan
The fan provides forced air cooling for the oscilloscope. It connects to a 12 V
connector on the Low Voltage Power Supply.
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