Theory of Operation
TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual
3-- 7
The front-panel board of the four channel units is effectively two panels in
parallel. The left side of the board is largely handled by the display ASIC for
channels 1 and 2. The right side of the board is handled by the channel 3 and 4
ASIC. Separate front-panel ICs support these data paths.
The LEDs are lighted to indicate an alternative use for the associated front-panel
knob. For more information, see the User Manual for this oscilloscope.
The LEDs are controlled by latching the value of the Channel 1--2 front panel
scan counter when the appropriate scan value is set.
Extension Modules
Optional extension modules add the capability for the microprocessor to interface
with IEEE-488 (GPIB) controllers and RS-232 controllers, and provide a PC-like
parallel printer interface. These modules contain the necessary chips to provide
standard RS-232 and IEEE-488 states. The parallel port interface is controlled by
software without significant hardware assistance.
Four-Channel
Oscilloscopes
LEDs
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