Block Diagrams
This section contains several diagrams to assist your understanding of
how the ATS-1 Access accomplishes its measurement tasks. While
knowledge of the internal circuitry is not required for operation of the
instrument, it may be more intelligently applied, and its limitations may
be better understood, by referring to these diagrams.
Overall Block Diagram
Figure 1-6 is a simplified block diagram of the ATS-1 Access.
The generator consists of a sinewave and squarewave generator
transformer-coupled to the output connectors. When the IMD option
is present, a second sinewave oscillator is added. Its output is summed
with the main oscillator to provide the necessary two-tone signal. With
the IMD waveform selected, the rear panel Analog Trigger output
carries the lower-frequency tone of the IMD tone pair for oscilloscope
triggering.
The analog analyzer consists of two identical wide-range autoranging
preamplifiers, a principal meter with filters, a secondary meter, a wow
and flutter discriminator, and phase and frequency meters.
The principal meter consists of a switchable and tunable bandpass or
bandreject filter, additional amplification, built-in high-pass and
low-pass filters, built-in CCIR and A-weighting filters, and two sockets
for optional filters. The bandreject is used in THD+N and SINAD
functions. The bandpass filter is used in the SELECTIVE modes of the
AMPLITUDE and NOISE functions and in the XTALK function.
The output of either the principal meter or the wow and flutter
discriminator feeds the primary reading detector. The primary
detector, depending on the measurement function and setup
parameters of that function, may have true RMS, average, or
quasi-peak response. The primary reading is normally displayed in the
upper-left corner of the display on the Main panel or Analyzer Only
panel and graphed with solid lines in sweeps of all functions except
PHASE.
1 Description
Block Diagrams Description
1-10 ATS-1 Access User's Manual
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