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System Functional Overview
Theory of Operation
3Ć6
The CSA 803A operates from either a 115 V or 230 V nominal line voltage
source at a line frequency between 48 Hz and 440 Hz. The LINE VOLTAGE
SELECTOR switch allows selection of AC line inputs of 90 V
RMS
to 132 V
RMS
or 180 V
RMS
to 250 V
RMS
.
Apply power to the instrument as follows:
1. Turn the rear panel PRINCIPAL POWER switch to ON
2. Turn the front panel ON/STANDBY switch to ON
A small green indicator lamp should light indicating the power is on.
The following is a brief overview of how the CSA 803A acquires, processes,
and displays a waveform from the input channels:
1. Analog input signals are connected to the sampling head inputs.
2. The Time Base/Controller block produces precisely timed strobe signals
based on the trigger signal.
3. These strobe signals are distributed to the sampling head channels and
instruct the sampling heads when to take samples of the input signal.
4. The Acquisition systems take the output of the sampling heads, amplify
or attenuate the signals, and apply any offset based on the vertical size
and position controls.
5. The output of the amplifiers are applied to analogĆtoĆdigital (A/D) conĆ
verters, which convert the sampled voltages to digital codes and then
store these codes in the acquisition system memory.
6. Once all the samples in a waveform have been acquired, the Time
Base/Controller then transfers these samples from the Acquisition sysĆ
tem memory to the Waveform Memory, through the waveform data
direct memory access (DMA).
7. The EXP processes information from the human interfaces (that is, the
menus, icons, buttons, and knobs that you interact with to control the
oscilloscope).
8. The EXP sends commands to the display system so that the function
that you selected is displayed.
9. When instructed by the EXP, the display system receives the waveform
data from waveform memory and converts it to a unique vertical rasterĆ
scan format for a display based on your settings.
Power Supply
Typical Waveform
Processing Cycle