Rohde & Schwarz ZPV - Group Delay Measurement

Depending
on
the
connection
of
the
test
item,
the
result
is
-
in
linear
display
(LIN.
21
pressed)
either
the
forward
transmission
factor
s
21
or
the
backward
transmission
factor
s^.
Pressing
button r,
f
15
displays
the
magnitude
and.
phase
and
pressing
button
X,
Y IT
the
real
and
imaginary
components
of
these
factors.
When
selecting
logarithmic
display
with
button
LOG.
2j5,
the
output
is
the
forward
or
backward
transmission
factor
in
dB
together
with
the
phase
angle
associated
with
the
forward
or
backward
transmission
factor.
For
calibrating
the
test
setup,
connect
the
equipment
without
the
test
item
and
press
button
PARAM.
CAL.
10
.
2
.
3
. 4
Group
Delay
Measurement
(using
Option
ZPV-B5)
In
the
modes
A,
B
or
B/A
(2£,
26
or
2?
pressed)
the
group
delay
can
be
measured
instead
of
the
phase.
2.3.4.
1
Single
Measurement
Pressing
button X
(54
conditions
the
group
delay
measurement.
For
performing
individual
measurements,
buttons
SET
f
Q
40,
SET
f
Q
+
0.4
kHz 41,
SET
f
+
4
kHz
39
and
SET
f
4-
40 kHz
JL
are
operated.
Q
O
The
test
method
is
based
on
two
individual
phase
measurements
which
are
made
at
two
very
closely
spaced
frequencies.
Ihe
phase
difference
A
f
is
obtained
and,
using
the
frequency
difference
Af,
the
group
delay X
is
calculated
from
X
=
A
f
/2
TT
1st.
Ihe
three
different
Af
values
corre-
sponding
to
buttons
27
,
32
and 41
permit
three
measurement
ranges
to
be
selected:
40
kHz:
0.001
to
9-999
ps
4
kHz:
0.01
to
99-99
ps
0.4 kHz:
0.1
to
999.9
ps
The
test
procedure
is
as
follows:
a)
Set
the
signal
generator
to
the
desired
test
frequency.
b)
Press
button
SET f
40.
c)
Depen
ding
on
the
expected
test
result,
increase
the
signal
generator
frequency
by
40
kHz,
4
kHz
or 0.4
kHz.
R
36737
-
14