Theory of Operation
The base WVR6020 instrument monitors SD inputs, and can be ordered with
options CPS to add monitoring of analog composite inputs, options AD or
DDE for multi
ple-channel audio, and options EYE or PHY for physical-layer
measurements.
The base WVR
7020 instrument monitors SD inputs, and can be ordered with
option HD to add monitoring of HD inputs, option CPS to add monitoring of
analog composite inputs, or option AD for multiple-channel audio.
The base WVR7120 instrument monitors SD inputs, and can be ordered with
option HD to add monitoring of HD inputs, CPS to add monitoring of analog
composite inputs, options AD or DDE for multiple-channel audio, and options
EYE or PHY for physical-layer measurements.
All models use an external XGA monitor for the display. This section covers the
full capability, so some portions may not apply to a model with fewer features.
This theory of operation is mainly based on the High-level block diagram. (See
Figure 2-1.). When necessary, other block diagrams may also be referenced. The
upper portion of the block diagram covers functions on the main board. The
lower
section covers those of the audio board. The primary functions on the
main board are:
1. Seri
al Digital Input
2. Composite input
3. Reference Input
4. Digital Waveform Processing Engine
5. Rasterizing Engine
6. Recursion and Picture processing Engine
7
.
C
ontrol Processor and it’s associated peripherals
8. Front Panel
9. LTC decoder
The primary functions on the audio board are:
1. Processing
2. Inputs
3. Outputs
There are also miscellaneous circuits such as the fans and their thermal control
system, and the "Fault" bus. These are covered in the High-level fault and fan
block diagram.(See Figure 2-2.)
WVR6020, WVR7020, and WVR7120 Waveform Rasterizers Service Manual 2–1
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