HP 8753D - Page 95

b.
To
uncouple the
channel stimulus
so that
the channel
power
will
be
uncoupled,
press:
4
MENU
5
N
N
NN
NN
NN
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NN
NN
NN
N
N
N
COUPLED CH
OFF
This
will
allow
you
to
separately
increase
the
power
for
channel 2
and channel
1,
so
that
you
can
observe
the
gain
compression
on
channel
2 while
channel 1
remains
unchanged.
c.
T
o
display
the
ratio
of
channel
2
data
to
channel
1 data
on the
channel 2
display,
press:
4
CHAN 2
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
DISPLAY
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
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
D2/D1
to
D2
ON
This produces
a trace
that represents
gain
compression
only
.
7.
Press
4
MARKER
5
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
MARKER
1
and
position the
marker at
approximately mid-span.
8.
Press
4
SCALE
REF
5
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
SCALE/DIV
4
1
5
4
x1
5
to change
the
scale
to
1
dB
per
division.
9.
Press
4
MENU
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
POWER
.
10.
Increase
the
power
until
you
observe
approximately
1dB
of compression
on
channel
2
,
using
the
step
keys
or
the
front
panel
knob
.
11.
To
locate the
worst
case
point
on
the
trace
,
press:
4
MARKER F
CTN
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
MKR
SEARCH
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
SEARCH:MIN
Figure 2-42. Gain Compression Using Linear
Sweep and
NNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNN
D2/D1 to D2 ON
12.
If
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNN
COUPLED CH OFF was selected, recouple the channel stimulus by pressing:
4
MENU
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
COUPLED CH ON
13. To place the marker exactly on a measurement point, press:
4
MARKER FCTN
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MARKER MODE MENU
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MARKERS:DISCRETE
2-46 Making Measurements