HP 8508A - Instrument State

Operation
FORMAT
The
default
display
configuration
for
magnitude
and
phase
related
measurements
is
magnitude
in
Display
1
and
phase
in
Display
2.
An
alternative
real
and
imaginary
format
is
available
when
displaying
the
following:
B/A
and
Phase
(together),
rho
and
phase
angle,
Z
and
1/Z.
DELAY
Uses
the
B-A
phase
to
make
simple
delay
measurements.
The
delay
is
calculated
assuming
a
4kHz
change
between
the
two
frequencies.
The
delay
is
shown
in
Display
1
with
Display
2
showing
“dely”
(for
delay).
The
delay
can
be
zeroed
by
pressing [SAVE
REF].
INSTRUMENT STATE
PRESET
.
This
key
forces
the
instrument
into
a
defined
measurement
state,
as
follows:
A
is
displayed
in
mV
with
no
other
functions
engaged
and
all ranging
is
automatic.
Error
numbers
showing
in
the
display
after
self-test
routine
indicate
possible
instrument
failure.
Press
[PRESET]
again.
If
the
error
number
remains,
refer
to
the
Service
section
information.
- NOTE: Err 601 indicates that the Input Module is not correctly installed.
LOCAL
Returns
the
instrument
to
front
panel
control
unless
local
lockout
has
been
asserted
over
the
HP-IB.
ADDRESS
Used
to
show
the
current
HP-IB
address
of
the
instrument.
It
is
changed
by
using
the
[STEP]
keys.
The
display
reverts
to
measurement
display
when
another
key
is
pressed.
DISPLAY AREA KEYS
MAG
RANGE
When
[MNL]
is
selected,
the
display
resolution
is
controllable
using
the
[STEP]
keys,
which
move
the
position
of
the
decimal
point.
When
A
and
B
are
displayed
together,
both
displays
show
the
same
resolution.
DIR
ANLG
OUT
When
this
mode
is
engaged,
the
raw
phase
and
magnitude
detector
outputs
are
fed
directly
to
the
rear
panel
so
that
external
measurements
can
be
made
when
a
CW
or
swept(’)
source
is
used.
Internal
gain
ranging
is
forced
into
manual
operation
with
the
display
showing
XXX
mV
full-scale
deflection,
adjustable
by
use
of
the
[STEP]
keys.
The
[LOCK
RANGE]
is
also
forced
into
manual
mode.
The
only
valid
measurement
selectionisAorB.
()
The
HP
8508A
will
lose
lock
if
the
sweep
rate
exceeds
approximately
1SMHz/second
or
if
the
frequency
reaches
a
lock
range
boundary.
LOCK RANGE
When
[MNL]
is
selected,
the
instrument
is
prevented
from
signal
searching
outside
the
current
frequency
range.
RANGE
Display
the
current
lock
range,
the
range
can
then
be
changed
by
using
the
[STEP]
keys.
The
display
reverts
to
measurement
display
when
another
key
is
pressed.
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E1089
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