CIRCUIT DESCRIPTION
INTRODUCTION
The Type 502 is a dual-beam, high-gain, nar
row-band oscilloscope employing a T60-type
dual-gun cathode-ray tube. The instrument has
identical Vertical Deflection Amplifiers, one for
the Upper Beam and one for the Lower. Simulta
neous horizontal deflection of both beams is
provided by a single Time-Base Generator and
Horizontal Sweep Amplifier circuit.
The Type 502 circuitry is arranged so that the
instrument can be used in any of several config
urations. It may be used as a conventional
single-beam oscilloscope by applying an input
signal to either of the Vertical Deflection Ampli
fiers. It may be used to examine two waveforms
simultaneously by applying input signals to both
Vertical Amplifiers. Both deflection amplifiers
may be used in a differential mode, to examine
the difference between, or the algebraic sum of,
two signals. The Upper Beam Deflection Ampli
fier can be connected to the horizontal deflec
tion plates, so that the instrument may be em
ployed as single-beam X-Y oscilloscope. And, by
means of the EXTERNAL horizontal-input con
nector, the instrument may be used as a dual
beam X-Y oscilloscope, with both traces plotted
on the same X scale.
VERTICAL DEFLECTION AMPLIFIERS
NEGATIVE FEEDBACK
R
47 0
NEGATIVE FEEDBACK R 480
Fig. 4-1. Block diagram of the Vertical Amplifier, illustrating the feedback
loops.
CIRCUIT DESCRIPTION — TYPE 502
4-1
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