Tektronix 7B10 Instruction Manual page 33

Theory
of
Operation—
7B1
0
TS
10
(time
slots
one
through
ten),
which
are connected
to
the
vertical
and
horizontal 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
connecting
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
<e>
INTERFACE
CONNECTORS AND
POWER
SUPPLY
The
Interface
Connectors
provide interconnection
for
control signals
and power
supply voltages between
the
mainframe and
the
time-base
unit.
The Power
Supply
derives supply voltages from
the
mainframe
supplies
for
power requirements unique
to
this
instrument. Additional voltage regulation
is
also
provided
TABLE
3-2
Readout Character
Selection
Characters
Time-Slot
Description
Encoded By
Decimal TS-1 Determines decimal magnitude
(number
of
zeros displayed or
prefix
change
information).
R751, R752,
R756
Uncalibrated
{>)
TS-3
Indicates calibrated or uncali-
brated
sweep
rates
and delay
times.
R761,
R764
1,
2,
5
TS-4
Scaling
(TIME/DIV)
R771
R772,
R773
m,
fj.
n,
p
TS-8
Defines the
prefix
which
modifies
the units
of
measurement.
R781,
R782
R783, R784
s(seconds)
TS-9
Defines the
unit of
measurement.
R793,
R794
3-10