Indicators; Front Panel; Bottom Panel - Tektronix A6902B Service Manual

Operating Instruc^ons
—
A6902B
Service
ONNECTORS
AN
Refer
to
Figure 2-5
for
the
location of
items
1
through 5.
Refer to
Figure
2-6
for
the location of
items
6
through
9.
NOTE
Only
CHANNEL
2
controls (items
2 through
5)
and
the
POWER
indicator (item
1)
are shown.
CHANNEL
1
controls are identical
to
CHANNEL
2.
(T)
POWER
indicator
is
on whenever
the
Isolator
is
energized.
fe)
POWER SWITCH
controls
application
of
ac
power
to
the Isolator.
An
indicator
light
on
the
front
panel
is
actuated
when
the
power
switch
is
in its
"on" position
(1).
(T)
POWER CONNECTOR/VOLTAGE
SELECTOR
allows the
connection
of
the
ac power
cord to
the isolator.
The connector
is
an lEC connector,
and
includes the Voltage Selector/indicator for
alternative
line
voltage,
(fully
discussed
in
the
"Preparation For
Use" section
of this
manual.)
VOLTS/DIV
switches
establish the sensitivity
of
the
oscilloscop>e/lsolator
system.
The
sensitivity
is
adju-
stable
from
20
mV/divis«on to
500 V/division
in
a
1
2,
and 5 sequence.
OUTPUT VOLTAGE
connectors
make
available
the
output of Isolator
Channels
1
and
2.
ZERO ADJ
controls
are
used
for
adjusting the output
dc
level
to zero
volts
with zero volts Input to the
A6902B.
7)
AC-COMMON-DC
switches select the
coupling
^
between
the input
probe and the input stage
of
the Isolator. In
DC, the input
is
directly
coupled:
in
AC
the input
is
connected
to
the isolator
through a capacitor;
and
in
COMMON
the input
is
connected
to
the electronic circuitry
Common
terminal within
the
Isolator,
(COMMON
is
com-
parable to
the
GND
position
on
a
conventional
oscilloscope.
It
connects the input to a refer-
ence
level
so
the
operator can
set the position
control).
CAUTION
label
provides fuse replacement and
line
voltage information.
@
EARTH-GROUND CONNECTION
is
a
standard
banana-plug
connector attached to
the Isolator
chassis ground.
BOTTOM
PANEL
(7^ CAUTION
label
warns operators not
to
open
the
A6902B case.
Refer
to
Figure
2-6
for
the location of item
1
1
PROBE
COMP
controls are
used
to
compensate
the input
stages of the isolator
when
the input
probes are
changed.
Refer to
Figure 2-6
for
the
location of
items 6
through 10.
CAUTION
label
warns
operators
not to
open the
A6902B
case.