EasyManua.ls Logo

Tektronix 2247A

Tektronix 2247A
275 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
a
|
3
es
ob
ta
Basic
Applications
cursors
may
be
used
to
make
voltage
measurements
on
the
ADD
trace
lf
either
CH
1
or
CH
2
Is
displayed
along
with
the
ADD
trace
(and,
of
course,
both
CH
1
and
CH
2
at
the
same
VOLTS/DIV
setting).
If
any
voltage
measurement
function
Is
active,
turning
off
CH
1
and
CH
2
to
display
the
ADD
trace
by
Itself
causes
the
message
“MEASMT
SOURCE:
CH
1
OR
2
ONLY"
to
appear
and
cancels
the
measurement.
If
calling
for
a
voltage
measurement
with
ADD
displayed
and
nelther
CH
1
nor
CH
2
displayed,
the
CH
1
VERTICAL
MODE
Is
turned
on
and
the
measurement
is
initialized
to
the
signal
applied
to
the
CH
1
Input.
Two
common
uses
for
ADD
mode
are:
(1)
providing
a
dc
offset
to
bring
an
ac
signal
riding on
top
of
a
large
de
voltage
within
the
graticule
viewing
area
and
(2)
canceling
out
a
large
line-frequency
signal
component
to
view
some
small
feature
riding on
the
waveform
in
greater
detall
using
common-mode
rejection.
The
following
general
precautions
should
be
observed
when
using
ADD
mode.
a.
Do
not
exceed
the
input-voltage
rating
of
the
oscilloscope
or
probe.
b.
Do
not
apply
signals
that
exceed
the
equivalent
of
about
eight
times
the
VOLTS/DIV
switch
settings,
since
large
voltages
may
distort
the
display.
For
example,
with
a
VOLTS/DIV
setting
of
0.5
V,
the
voltage
applied
to
that
channel
should
not
exceed
4
V,
c.
Use
CH
1
and
CH
2
POSITION
control
settings
which
most
nearly
position
the
signal
on
each
channel
to
mid-screen,
when
viewed
separately.
This
ensures
the
greatest
dynamic
range
for
ADD
mode
signal
displays.
d.
To
have
similar
responses
for
both
channels,
use
the
same
Input
COUPLING
for
both
CH
1
and
CH
2.
The
following
procedure
shows
how
to
eliminate
an
unwanted
ac
Input-
power
frequency
signal
component
from
the
displayed
signal.
a.
Perform
the
“Initial
Setup”
In
“OPERATOR
CHECKS
AND
ADJUST-
MENTS"
Section
4,
and
center
the
baseline
trace
vertically.
b.
Apply
the
signal
of
Interest
containing
the
unwanted
line-frequency
component
to
the
CH
1
Input
connector.
c.
Apply
a
line-frequency
signal
to
the
CH
2
input
connector.
To
maxi-
mize
cancellation,
the
signal
applied
to
the
CH
2
Input
must
be
exactly
In
phase
(or
exactly
180°
out
of
phase)
with
the
frequency
component
to
be
canceled
from
the
CH
1
signal.
2247A
Operators
5-23

Related product manuals