HP 8508A - Function Keys

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_ Operation
A,
B/A
mag
Places
the
A
measurement
in
Display
1
and
the
B/A
measurement
in
Display
2.
B,
B-A
phase
:
Places
the
B
measurement
in
Display
1
and
the
B-A
phase
in
Display
2.
DISPLAY
;
Defines
the
scale
associated
with
the
display(s),
depending
on
what
measurement
is
displayed.
Units
selects
the
linear
scale
and
dB
selects
the
log
scale.
Example
1
-
Amplitude
of
A
has
a
units
scale
in
mV
and
a
dB
scale
in
dbuV.
Example
2
-
Power
in
A
has
a
units
scale
in
uW
and
a
dB
scale
in
dBm.
"FUNCTION KEYS
Works
in
A
amplitude,
B
amplitude
B/A
magnitude
and
Phase
to
make
measurements
relative
to
a
set
of
reference
values.
[SHIFT]
[SAVE
REF]
stores
the
current
A,
B
and
Phase
values,
and
turns
[REF]
on.
When
[REF]
is
turned
on:
,
displayed
phase
=
measured
phase
-
saved
phase
and
displayed
measured amp. or mag.
amplitude or magnitude =
saved amp. or mag.
REFL MEAS
Uses
measurements
of
B/A
ratio
and
B-A
phase
to
make
simple
reflection
measurements
-
using
an
external
device.
The
[SHORT]
and
[OPEN]
reference
impedances
are
used
with
a
bridge
or
directional
coupler
and
[LOAD]
is
used
when
making
measurements
with
a
Tee.
Note
that
[LOAD]
is
selected
as
a
shifted
function.
To
initialize
the
measurement,
connect
the
external
equipment
and
connect
the
appropriate
reference
impedance
to
the
test
port
.
Press
[SHIFT]
[SAVE
REF].
The
REF
LED
is
automatically
turned
on.
The
A,
B
and
phase
values
are
then
retained
and
used
as
a
correction
for
any
level
and/or
phase
changes
occurring
between
the
A
channel
(incident)
signal
and
the
B
channel
(reflected)
signal.
To
make
a
corrected
measurement,
connect
the
DUT
to
the
test
port.
It
is
also
possible
to
make
an
uncorrected
measurement
by
turning
REF
off.
When
making
Z
or
1/Z
measurements,
absolute
values
can
be
displayed
by
choosing
the
appropriate
[SYSTEM
IMPD}
of
50
or
75
ohms.
If
values
normalized
to
Z0
are
required,
choose
[NORM].
POWER MEAS
Works
with
A
and
B
amplitude
only
to
convert
the
measured
voltage
to
an
equivalent
power
using
the
value
selected
by the [SYSTEM IMPD] key.
'
E1089
3-5