CSA8000 & TDS8000 Instruments and Sampling Modules
3–1
Theory of Operation
This section describes the electrical operation of the instrument and sampling
modules. Figure 9–1 on page 9–1 shows the module interconnections.
Logic Conventions
The instrument contains many digital logic circuits. This manual refers to these
circuits with standard logic symbols and terms. Unless otherwise stated, all logic
functions are described using the positive-logic convention: the more positive of
the two logic levels is the high (1) state, and the more negative level is the low
(0) state. Signal states may also be described as “true” meaning their active state
or “false” meaning their nonactive state. The specific voltages that constitute a
high or low state vary among the electronic devices.
Mainframe Overview
This mainframe overview describes the basic operation of each functional circuit
block as shown in Figure 9–1 on page 9–1.
The instrument control system is a dual Wintel/PowerPC based processor board.
The platform features VGA resolution flat-panel display, transparent touch
screen and user front-panel with direct access to commonly used scope functions.
The instrument is also equipped with a mouse pointing device to facilitate access
to more advanced scope functions
A signal enters the instrument through a direct coaxial connection to the input
connector on a sampling module, or a real time probe connected to the sampling
module channel.
Acquisition System.
The acquisition system conditions the input signals, samples
them, converts them to digital signals, and controls the acquisition process under
direction of the processor system. The acquisition system includes the multi-
source trigger, acquisition timebase, and acquisition mode generation and control
circuitry. The acquisition board is located in the bottom compartment of the
instrument and can accommodate four dual-channel sampling Plug-ins, two
one-channel optical plug-ins and a trigger/holdoff subsystem. Up to 8 vertical
channels are accommodated simultaneously. Channels 1 and 2 are either large or
small slots. The presence of an module in one or both large slots displaces the
small slot functionality in the leftmost Channel 1 - Channel 2 small slot. The
external trigger and all small slot channels feature a Tekprobe Level 2 probe
General
Input Signal Path
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