HP 8753D - Phase or Group Delay Measurements

Phase or
Group Delay
Measurements
F
or
information
on
group delay
principles,
refer to
\Group Delay
Principles" in
Chapter 6.
The
accuracy
of
this
measurement
depends
on the
quality of
the mixer
that is
being used
for
calibration
and
how
well
this
mixer
has been
characterized. The
following measurement
must
be
performed
with
a
broadband
calibration
mixer that
has a
known group
delay.
The following
table
lists
the
specications
of two
mixers that
may be
used for
calibration:
Model
Number
Useful
Frequency
Range
Group
Delay
ANZA
C
MCD-123
.03
to 3
GHz
.5
ns
Mini-Circuits
ZFM-4
dc
to 1250
MHz
.6
ns
1.
Set
the
LO
source
to
the
desired
CW
frequency
and
power
level.
F
or
this
example the
LO
source
is
set
to
the
following
values:
CW
frequency
=
1000
MHz
power
=
13
dBm
2.
Initialize
the
analyzer
by
pressing
4
PRESET
5
.
3.
From
the
front
panel
of
the
HP
8753D
,
set
the
desired
receiver
frequency
and
source
output
power
by
pressing:
4
CENTER
5
4
300
5
4
M/

5
4
SP
AN
5
4
100
5
4
M/

5
4
MENU
5
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
POWER
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
PWR
RANGE MAN
4
0
5
4
x1
5
4.
Connect
the
instruments
as
shown
in Figure
3-17
,
placing
a
broadband
\calibration"
mixer
(ZFM-4)
between
PORT
1
and
PORT
2.
Caution
T
o
prevent
connector
damage
,
use
an
adapter
(HP
part
number
1250-1462)
as a
connector
saver
for
R
CHANNEL
IN.
3-24 Making Mixer Measurements