Operating Instructions; Front Panel Controls And Connectors; Operating Instructions And Checkout - Tektronix 7A19 Instruction Manual

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