HP 8753D - Page 56

T
o
Divide
Measurement
Data
by
the
Memory
Trace
Y
ou
can
use
this
feature
for
ratio
comparison
of
two traces
,for
example,
measurements of
gain
or
attenuation.
1.
Y
ou
must
have
already
stored
a
data trace
to the
active channel
memory,
as described
in \T
o
Save
a
Data
Trace
to
the
Display
Memory
."
2.
Press
4
DISPLA
Y
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
DATA/MEM
to
divide
the
data
by
the
memory
.
The analyzer
normalizes the
data
to
the
memory
,
and
shows
the
results
.
T
o
Subtract
the
Memory
Trace
from
the
Measurement
Data
Trace
Y
ou
can
use
this
feature
for
storing
a
measured
vector error
, for
example,
directivity.
Then,
you
can
later
subtract
it
from
the
device
measurement.
1.
Y
ou
must
have
already
stored
a
data
trace
to the
active channel
memory,
as described
in
\T
o
Save
a
Data
Trace
to
the
Display
Memory
."
2.
Press
4
DISPLA
Y
5
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
DATA-MEM
to
subtract
the
memory
from
the
measurement
data.
The
analyzer
performs
a
vector subtraction
on the
complex data.
T
o
Ratio
Measurements
in
Channel 1
and 2
Y
ou
may
want
to
use this
feature when
making
amplier
measurements
to
produce
a
trace
that
represents
gain
compression.
F
or
example
,
with the
channels
uncoupled,
you
can
increase
the
power
for
channel
2
while
channel
1
remains unchanged.
This
will
allow
you
to
observe
the
gain compression
on
channel
2
.
1.
Press
4
MENU
5
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
COUPLED
CH
OFF
to
uncouple
the
channels
.
2.
Make
sure
that
both
channels
must
have
the
same
number
of
points.
a.
Press
4
CHAN
1
5
4
MENU
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
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N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
NUMBER
OF
POINTS
and
notice
the
number
of
points
setting,
shown
on
the
analyzer
display
.
b.
Press
4
CHAN 2
5
4
MENU
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NUMBER
OF
POINTS
and
enter
the
same
value
that
you
observed
for
the
channel
1
setting.
3.
Press
4
DISPLA
Y
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
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N
N
N
N
N
N
N
N
N
N
DUAL
CHAN
ON
N
N
N
N
N
N
N
N
N
N
N
N
N
N
MORE
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
D2/D1
TO
D2
ON
to
ratio
channels
1
and
2,
and
put
the
results in
the channel
2data
array.
This ratio
is applied
to
the
complex
data.
4.
Refer to
Chapter
\Measuring
Gain
Compression"
for
the
procedure
on
identifying
the
1dB
compression point.
Making Measurements 2-7