HP 8340B Manual page 51

4-9.
SINGLE SIDEBAND PHASE NOISE (Cont'd)
7.
Adjust the HP
3585A marker
to the peak of the
IF.
8.
On the
HP 3585A,
press
COUNTER.
9.
Adjust the frequency of the LO for an HP 3585A COUNTER
reading of
1
MHz ±0.9 Hz- This
removes
any
frequency offsets between the
DUT
and LO.
10. Adjust the output
power
of
the DUT for 0 dBm at
the peak of the
IF.
Select
a
REFERENCE LEVEL
of
0
dBm on the
HP 3585A.
SYSTEM CALIBRATION
30 Hz Offset
Calibration
(not applicable to units equipped
with Option 007, Relaxed Phase Noise specifications)
11.
On the HP 3585A,
press
FREQUENCY SPAN, 250 Hz, RES BW, 3
Hz. Allow one
sweep
to occur.
Ensure power
at peak
if IF is still 0
dBm.
12.
Reduce
LO frequency by 30 Hz (IF
=
1.00003 MHz
±0.9 Hz).
13. Allow one sweep of the
HP 3585A
to occur. Adjust the HP
3585A marker to the peak of the
IF.
Record the marker power
level (Cal Data) into Table 4-19.
Table 4-19. Phase Noise Calibration Data
Step
13
14
16
19
21
22
Offset (Hz)
30
100
1K
10K
100K
0
Cal Data
(dB)
CD=
CD
=
CD=
CD=
CD
=
IFDC=
100
Hz Offset Calibration
14.
Reduce
the LO frequency by 70 Hz (IF
=
1.0001
MHz
±0.9
Hz) Repeat step
13.
1
kHz Offset Calibration
15. On the HP
3585A, press FREQUENCY SPAN, 2500 Hz, RES BW, 30 Hz.
16. Reduce LO
frequency
by 900 Hz
(IF
=
1.001
MHz
±0.9 Hz).
Repeat step
13.
10
kHz Offset Calibration
17. Connect
1 MHz
Notch Filter as shown
in
Figure 4-9. Select
1 MOhm
input impedance on the HP
3585A.
18.
On the HP 3585A,
press
FREQUENCY SPAN,
25 kHz, RES BW, 100 Hz.
19.
Reduce LO
frequency by
9
kHz
(IF
=
1.01
MHz
±0.9 Hz).
Repeat step
13,
Performance Tests
HP 8340B/41B