HP 8753D - Page 531

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UNCOUPLED
allows the
marker stimulus
values to
be controlled
independently
on each
channel.
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UP CONVERTER
sends
the sum
frequency of
the RF
and LO
to
the
R
channel.
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UPPER
LIMIT
sets
the
upper
limit
value for
the start
of the
segment. If
a
lower
limit
is
specied,
an upper
limit must
also be
dened. If
no
upper
limit
is
required
for
a particular
measurement, force
the
upper
limit
value
out
of
range
(for
example +500
dB).
When
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UPPER
LIMIT
or
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LOWER
LIMIT
is
pressed,
all
the
segments in
the table
are
displayed
in
terms
of
upper
and
lower
limits,
even if
they were
dened
as
delta
limits
and
middle
value.
If you
attempt
to
set
an
upper
limit
that
is
lower
than
the
lower
limit, or
vice
versa,
both
limits
will
be
automatically
set
to
the
same value
.
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USE
MEMORY
ON
off
(Option
010
only)
remembers
a
specied
window
pulse
width
(or
step
rise time)
dierent
from
the
standard
window
values
.
A window
is activated
only for
viewing
a
time
domain
response
,
and does
not aect
a displayed
frequency
domain
response
.
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USE
PASS
CONTROL
lets you
control the
analyzer with
the computer
over
HP-IB
as
with
the
talker/listener mode
,and
also
allows
the
analyzer
to
become
a
controller in
order to
plot,
print,
or
directly
access
an
external
disk.
During
this
peripheral
operation,
the
host
computer
is
free
to
perform
other
internal
tasks
that
do
not
require
use
of
the
bus
(the
bus
is
tied
up
by
the
network
analyzer
during
this
time).
The
pass
control
mode
requires
that
the
external
controller
is
programmed
to
respond
to
a
request
for
control
and
to
issue
a
take
control
command.
When
the
peripheral
operation
is
complete
,
the
analyzer
passes
control
back
to
the
computer
.
Refer
to
the
\HP-IB
Programming
Reference"
and
\HP-IB
Programming
Examples"
chapters
in
the
HP
8753D
Network
Analyzer
Programmer's
Guide
for
more
information.
In
general,
use
the
talker/listener
mode
for
programming the
analyzer
unless
direct
peripheral
access
is
required.
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USE
SENSOR
A/B
selects
the
A
or
B
power
sensor
calibration
factor
list for
use
in
power meter calibration measurements
.
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USER
is used to select the preset condition dened by the user
.
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USER KIT
is used to dene kits other than those oered by
Hewlett-Packard.
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VELOCITY FACTOR
Enters the velocity factor used by the analyzer to calculate
equivalent electrical length in distance-to-fault measurements
using the time domain option. Values entered should be less
than 1.
Velocity factor is the ratio of the velocity of wave propagation
in a coaxial cable to the velocity of wave propagation in free
space. Most cables have a relative velocity of about 0.66 the
Key Denitions 9-45