HP 3336A - Page 110

Model
3336A/B/C
Performance
Tests
h.
Create
an
impedance
mismatch
factor
of
two
by
inserting
a
feedthru
termination
bet-
ween
the
load
port
of
the
directional
coupler
and
the
3336
under
test.
If
the
output
under
@
test
is
a
balanced
output,
create
a
mismatch
by
placing
a
termination
resistor
across
the
3336
output.
The
value
of
this
resistor
must
be
the
same
as
the
impedance
of
the
output
under
test.
(e.g.
use
a
50
ohm
termination
when
testing
the
50
ohm
output.)
i.
In
all
cases,
adjust
the
wave
analyzer’s
input
sensitivity
controls
until
it
displays
—
9.5
dB.
If
the
impedance
mismatch
is
a
factor
of
two,
all
the
mismatches
produced
in
Step
h
have
a
return
loss
of
9.54
dB.
j.
Remove
the
Feedthru
Termination
or
Termination
Resistor
and
connect
the
Direc-
tional
Coupler
directly
to
the
3336
output
under
test.
k.
Record
the
Wave
Analyzer
reading
on
the
Performance
Test
Record
for
the
output
and
frequency
tested.
NOTE
Make
sure
the
Wave
Analyzer
is
tuned
to
the15
Hz
signal
before
recording
the
reading.
1.
Repeat
Steps
c
thru
k
until
the
return
loss
at
all
the
test
frequencies
listed
in
Step
c
has
been
measured.
m.
Repeat
Steps
b
thru
|
until
the
return
loss
of
all
the
3336’s
signal
outputs
has
been
measured.
IOMHz REF OUTPUT
~hp-
3336
(DUT)
[Cosesa] 3° lle c000}
3} of poo uy EXT REF
so = 4
Ez ] 33223] | INPUT
4 4] Hay ou L
FEEDTHRU TERMINATION
OR TERMINATION RESIS-
TOR IS INSERTED HERE SO
DIRECTIONAL COUPLER
SEES A GROSS IMPEDANCE
MISMATCH.
REFERENCE SYNTHESIZER
50-75 OHM MINIMUM
LOSS PAD USED TO T
75. OUTPUT ONLY!
EST
WAVE ANALYZER FEEDTHRU TERMINATION OR
TERMINATION RESISTOR.
|
HIGH FREQUENCY PROBE |
(DIODE DETECTOR) ‘
ye
3336-4-7
&
Figure
4-7,
On
Carrier
Return
Loss
Equipment
Set
Up.
4-25