HP 8753D - Page 285

Trigger Menu
The
trigger
menu
is
used to
select the
type and
number of
groups for
the sweep
trigger.
The
following
is
a
description
of
the
softkeys located
within this
menu:
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N
HOLD
freezes
the
data
trace
on
the
display
,
and the
analyzer stops
sweeping and
taking data.
The notation
\Hld"
is
displayed
at
the
left
of
the
graticule
.
If
the
"
indicator
is
on
at
the left
side
of the
display,
trigger
a
new
sweep
with
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SINGLE
.
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SINGLE
takes
one
sweep
of
data
and
returns
to
the
hold
mode
.
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NUMBER
of
GROUPS
triggers
a
user-specied
number
of
sweeps
,
and
returns
to the
hold
mode
. This
function
can
be
used
to
override
the
test
set
hold
mode
(indicated
by
the
notation
''tsH'' at
the
left
of
the
screen).
In
this
mode
,
the
electro-mechanical
transfer
switch
(Option
007)
and
attenuator
are
not
protected
against
unwanted
continuous
switching
.
This
occurs
in
a
full
two-port
calibration,
in
a
measurement
of
two
dierent
parameters
that
require
power
out
from
both
ports
,
or
when
the
channels
are
uncoupled
and
a
dierent
power
level
is
set
for
each
channel.
If
averaging
is
on,
the
number
of
groups
should
be
at
least
equal
to
the
averaging
factor
selected,
to
allow
measurement
of
a
fully
averaged
trace
.
Entering
a
number
of
groups
resets
the averaging
counter
to
1.
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CONTINUOUS
is
the standard
sweep mode
.
The
sweep
is
triggered
automatically
and
continuously
and
the
trace
is
updated
with
each
sweep
.
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TRIGGER:
TRIG OFF
switches
o
external
trigger
mode
.
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EXT
TRIG
ON
SWEEP
is
used
when
the
sweep
is
triggered
on an
externally
generated
signal
that
is
connected
to the
rear
panel
EXT
TRIGGER
input.
The
sweep
is
started
with
a
high
to
low
transition
of a
TTL
signal.
If
this
key
is
pressed
when
no
external
trigger
signal
is
connected,
the
notation
''Ext'' is
displayed at
the
left
side
of
the
display
to
indicate
that
the
analyzer
is
waiting
for
a
trigger
.
When
a
trigger
signal
is
connected,
the
''Ext''
notation
is
replaced
by
the
sweep
speed
indicator
either
in
the
status
notations
area
or
on
the
trace
.
External
trigger
mode
is
allowed
in
every
sweep
mode
.
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EXT
TRIG ON
POINT is
similar to
the
trigger
on
sweep
,
but
triggers
on
each
data
point
in
a
sweep
.
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MANUAL
TRG ON
POINT waits
for a
manual
trigger
for
each
point.
Subsequent
pressing
of
this softkey
triggers
each
measurement.
The
annotation
''man''
appears
at
the
left
side
of
the display
when
the
instrument
is
waiting
for
the
trigger
to
occur
.This
feature
is
useful
in
a
test sequence when an external device or instrument requires changes at each point.
6-18 Application and Operation Concepts