Circuit
Description—7D14
base
of
Q796 is amplified and
inverted by this stage to
provide
the DCU
RESET output.
INTRODUCTION
TO
THE
READOUT
SYSTEM
Introduction
The
following discussion is provided to acquaint
the
7D14
user with the Readout System employed in Tek
tronix 7000-Series
Oscilloscopes. Since
the
oscilloscope
Readout
System provides the digital readout for the 7D14,
it
is necessary to relate the function of the 7D14 to the
Readout
System
to
gain a
better understanding of the 7D14
operation. A
detailed
circuit description
of the 7000-series
Readout
System is given in the oscilloscope instruction
manual.
The
Readout
System
The
Readout System in the 7000-series oscilloscopes
provides alpha-numeric
display
of
information encoded by
the
plug-in units. This display is presented on the CRT and
is
written by
the CRT beam on a time-shared basis with the
analog
waveform
display.
The Readout
System produces a
pulse train consisting of
ten
negative-going pulses
called time-slots. These pulses
represent a possible character in a readout word, and each is
assigned
a time-slot number corresponding to its position
in
the
word. Each time-slot pulse is directed to one of ten
output lines,
labelled
TS-1 through TS-10 (time-slots one
through
ten),
which are
connected to the vertical and hori
zontal plug-in
compartments. Two output lines,
row and
column,
are connected from each
channel (two channels
per plug-in compartment) back to
the Readout
System.
Data
is encoded
on these output lines either by connec
ting
resistors between them and the time-slot input lines or
by
generating
equivalent currents. The resultant output is a
sequence of analog current
levels on the
row and column
output
lines.
The row and column current levels
are
decoded
by the Readout System to address a character
matrix
during each
time-slot, thus selecting a character to
be displayed or a special instruction to
be followed.
3-23
Содержание 7D14
Страница 4: ...7D14 ...
Страница 11: ...Operating Instructions 7D14 Fig 2 1 7D14 front panel controls and connectors 2 2 ...
Страница 24: ...W Fig 3 3 Channel A Signal Conditioning circuit detailed block diagram Circuit Description 7D14 ...
Страница 33: ... 3 13 Fig 3 11 Logic diagram for Zero Cancel Logic stage Circuit Description 7D14 ...
Страница 38: ...3 18 Fig 3 16 Time Base and Control circuit detailed block diagram Circuit Description 7D14 ...
Страница 44: ...NOTES ...
Страница 46: ...NJ Fig 4 1 Electrode configuration for semiconductors in this instrument I ...
Страница 68: ...NOTES ...
Страница 96: ... 7DI 4 DIGITAL COUNTER UNIT ...
Страница 98: ...GRS 0371 BLOCK DIAGRAM ...
Страница 99: ......
Страница 103: ...0 0 I 200 mV 500 µs 0 001 200 mV 500 µs 0 001 MHz 00 mV E 00 µs 0 001 MHz ...
Страница 106: ...1 ...
Страница 110: ...A2 Logic Circuit Board Assembly jQ798i 798 jc743 CR744t uni R724 R742 JL744S FrR796 ...
Страница 113: ......
Страница 114: ...P 0 A2 LOGIC BOARD ...
Страница 121: ... A B D t F H J NPR Tj ZWX V A AC M AEA HUM qAZ DEF HJ N P R S T J V V7X y ABM APAI AA 7DI4 ...
Страница 129: ......
Страница 130: ...4 7D14 DIGITAL COUNTER ...