Section
2— 7A19
OPERATING INSTRUCTIONS
General
To
effectively
use
the
7A19,
the
operation
and
capabilities
of the
instrument
must be known.
This
section
describes front-panel control functions, general
information
on
signal
input connections,
and
other
subjects that pertain
to various
measurement
applications.
Installation
The
7A19
is
calibrated
and
ready
for use
as
received.
It
can
be
installed
in
any
compartment
of
TEKTRONIX
7000-Series Oscilloscopes, but
is
intended
for principal
use
in
vertical
plug-in
compartments.
To
install,
align
the
upper
and
lower
rails
of the
7A19
with the
oscilloscope tracks
and
insert
it.
The
front panel
will
be
flush
with
the front of the
oscilloscope
and
the
latch
at
the
bottom
left
corner
will
be
in
place against the front panel
when
the
7A19
is
fully
inserted.
l
o
remove
the
7A19,
pull
on
the
latch (inscribed
with
the unit
identification
"7A19")
and
the
7A19
will
unlatch.
Continue
pulling to
slide
the
7A19
out
of the oscilloscope.
FRONT
PANEL
CONTROLS AND CONNECTORS
VOLTS/DIV
Selects calibrated deflection factors
from
10
mV/Div
to
1
V/Div;
7
steps
in
a 1-2-5
sequence.
POSITION
Controls
the position of the
trace.
IDENTIFY
Deflects
the
trace
about
0.3
division for trace identification.
In
instruments with readout,
also
replaces
readout
with
the
word
"IDENTIFY".
GAIN
Adjustment
Screwdriver
adjustment
permits
calibration of deflection factor.
POLARITY
Provides
a
means
of
inverting
the
display.
-tUP:
A
positive-going
signal at
the
INPUT
connector
deflects the
CRT
display
upward.
INVERT
;
A
positive-going
signal at
the
INPUT
connector
deflects
the
CRT
display
downward.
Input Coupling
Selects
signal
input coupling
mode.
Switch
AC: The
AC
component
of
the
signal
is
coupled
to
the
amplifier
input while the
DC
component
is
blocked.
AC GND:
Grounds
the amplifier
input while maintaining the
same
AC
load for
the input
signal.
PRE-CHG:
Provides
a
charge path
for
the
AC
coupling capacitor
to
pre-charge the input
circuit
before
switching the
Input coupling
switch
to
AC.
DC:
Both
AC
and
DC
components
of
the
signal
are
coupled
to
the
amplifier input.
DC GND:
Grounds
the amplifier
input while maintaining the
same
DC
load for the
input
signal.
INPUT
Connector
Provides
a
means
for
connecting
a
signal.
VARIABLE DELAY
Delays
the
signal
up
to
±500
(Option
4)
picoseconds
by
using
a
calibrated
10 turn
dial.
OPERATING INSTRUCTIONS
and
CHECKOUT
Probes
Probes
recommended
for
use
with
the
7
A
19
are the
P6056 (10X)orP6057
(lOOX).Both
probes
are
compatible
to
50
ohm
systems,
and
will
allow
optimum
frequency
response.
These probes
also
contain
trace
IDENTIFY
and
readout encoding
functions.
2-1
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