HP 8753D - Page 286

Source Attenuator
Switch Protection
The
programmable
step
attenuator
of the
source can
be switched
between port
1and
port 2
when
the
test
port
power
is
uncoupled or
between channel
1and
channel 2
when the
channel
power
is
uncoupled.
T
o
avoid
premature wear
of the
attenuator,
measurement congurations
requiring
continuous
switching
between
dierent
power
ranges are
not allowed.
F
or
example
,
channels 1
and 2
of the
analyzer are
decoupled,
power
levels
in
two
dierent
ranges
are
selected
for
each
channel,
and dual
channel display
is engaged.
T
o
prevent
continuous
switching
between
the
two
power
ranges,
the analyzer
automatically engages
the
test
set
hold
mode
after
measuring both
channels once
.The
active
channel
continues
to
be
updated
each
sweep
while
the inactive
channel is
placed in
the
hold
mode
.
(The
status
annotation
tsH appears
on the
left side
of the
display
.)
If
averaging
is
on,
the
test
set
hold
mode does
not engage
until the
specied number
of
sweeps
is
completed.
The
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MEASURE
RESTART
and
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NUMBER
OF
GROUPS
(see
\Trigger
Menu") softkeys
can override
this
protection
feature
.
Allowing
Repetitive
Switching
of
the
Attenuator
The
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MEASURE
RESTART
and
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NUMBER
OF
GROUPS
(see
\Trigger
Menu")
softkeys
allow
measurements
which
demand
repetitive
switching
of
the step
attenuator.
Use these
softkeys
with
caution;
repetitive
switching
can
cause
premature wearing
of the
attenuator.
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MEASURE
RESTART
causes
one
measurement
to
occur
before
activating
the
test
set
hold
mode
.
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NUMBER
OF
GROUPS
(see
\Trigger
Menu")
causes
a
specied
number
of
measurements
to
occur
before
activating
the
test
set
hold
mode.
Application and Operation Concepts 6-19