MODE L 3562A
C I RCUIT. DESCRI PTIONS
I n figu re 6-3, the two channel waveform recorder is converted into a two channel, fixed
span, dynamic signal analyzer with source by adding the digital filter, FFT, and FPP (Floating
Point Transform Processor) assemblies. The digital filter allows the user to look at the
input spectrum w ith different resoluti"on bandwidths and different shaped resolution
bandwidth filters. The FFT assembly operates on the d igital data out of the digital filter
to provide a frequency domain representation of the input signal. The FFT data is stored
in the RAM and displayed. The FPP is a bit slice processor which makes all the fast numerical
calcu lations. A d igital source assembly is added to simplif
y
the CPU bus structure. This
assembly controls all the digital settings for the input, ADC, and source assemblies. The
CPU is now dedicated to supervising and controlling the operations of the instrument.
In figure 6-3, a trigger assembly was also added. The trigger assembly allows the instrument
to operate in external
external reference
and external
modes.
In figllre
·o�4
,
t
h
e
an
a
l
y
ze
r
b
e
c
ohi
e
s
the HP 3S62A by a:oclTiig fne localoscillafof a:nd program
ROM assembl ies. The local oscillator provides digital sine and cosine signals for the digital
source and digital filter. The digital source distributes the digital sine to the analog source
assembly for conversion to an analog signal. The digital filter uses the sine and cosine
signals for zoom measurements. In a zoom measurement, a narrow frequency span is
selected « 1 00 kHz) for a high resolution close-u p shot of a frequency spectrum.
The program ROM assembly was added to give the instrument more program memory
space. The common bus was split into two bus structu res: the system data bus and the
global data bus. The system bus is used to transfer commands from the system CPU to
the other assemb lies. The global bus is used to transfer measurement data between the
assembl ies.
I n the H P 3562A process control is distributed away from the system CPU. Each assembly
has its own processor or state machine which controls its local operations. The system
CPU tells each assembly which process to execute and monitors the overall functioning
and data processing of the instru ment.
6-5/6-6
Содержание 3562A
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Страница 305: ...c c I O Sequencer S r J Sequence Decoder ...
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