HP 3336A - Page 124

Model
3336A/B/C
Performance
Tests
4-37. Integrated Phase Noise.
4-38.
This
performance
test
verifies
that
the
-hp-
3336
meets
the
Integrated
Phase
Noise
specification
in
Table
4-1.
Specification:
3336A/B:
>72
dB
for
a
3kHz
band
centered
2
kHz
either
side
of
the
3336
carrier.
3336C:
>60
dB
for
a
30
kHz
band
centered
on
the
3336
carrier,
excluding
1
Hz
about
the
carrier.
Required Equipment:
Low
Phase
Noise
Synthesizer
-hp-
Model
3335A
Mixer
-hp-
Model
10534A
1
MHz
Low
Pass
Filter
TT
Electronics,
Model
J903
de
Voltmeter
-hp-
Model
3455A
ac
Voltmeter
-hp-
Model
400FL
75 to 50 ohm Minimum Loss Impedance
Matching
Pad
-hp-
Model
85428B
50
ohm
Feedthru
Termination
-hp-
Model
11048C
15
kHz,
noise
equivalent,
Low
Pass
Filter,
consisting
of:
Resistor:
10
k
ohm
-hp-
Part
No.
0757-0340
Capacitor:
1600
pF
-hp-
Part
No.
0160-2223
©
a.
Connect
the
equipment
as
shown
in
Figure
4-14.
Make
sure
that
the
frequency
references
of
the
3336
and
the
reference
synthesizer
are
locked
together.
b. Set the reference synthesizer controls as follows:
PREQUENCY sco ueinkes ta tth enn n5-4 oo eaontees 20.001 MHz
AMPLITUDE ..03 oinays vaies aed cee 2G So eweeaw + 7.00 dBm
c. Set the 3336 (DUT) controls as follows:
FREQUENCY (cv cceeuue sos tumteceitnee titan! 20 MHz
AMPLITUDE. ois cc octrena wor deiseeuewacs + 2.7 dBm (75 ohm)
d. Record the ac voltmeter reading, using the dB scale (Vref).
e. Change the reference synthesizer’s frequency to 20 MHz.
f. Disconnect the ac voltmeter and connect the dc voltmeter in its place.
g.
Modify
the
phase
of
the
3336’s
output,
using
the
Tuning
control
in
the
Modify
group,
until the
dc voltmeter
reads
0
V, +
10
mV.
h. Disconnect the dc voltmeter and reconnect the ac voltmeter.
i. Record the ac voltmeter reading, using the dB scale (Vnoise).
4-39