HP 8340B Manual page 52

4-9.
SINGLE SIDEBAND PHASE NOISE (Cont'd)
100
kHz Offset Calibration
20. On the
HP 3585A, press FREQUENCY
SPAN,
250
kHz, RES BW, 1
kHz.
21. Reduce LO frequency by 90
kHz (IF
=
1.1
MHz
±0.9
Hz).
Repeat step
13.
IF
Cal Data
22. Increase the LO frequency by 100
kHz (IF
=
1 MHz ±0.9
Hz).
Repeat step
13.
PHASE NOISE MEASUREMENT
23. Connect equipment as shown in Figure 4-9
with the amplifier connected directly to the HP 3585A
50 Ohm
input.
Return the HP 3585A to 50 Ohm input
impedance.
24. On the
DUT, press
[POWER LEVEL] [0] [dB(m)].
Select the HP 3585A REFERENCE LEVEL
to
place the
peak
of the
IF
at the top graticule of the display. Ensure
IF
=
1
MHz
±0.9
Hz.
If
necessary, adjust LO for
an
HP 3585A COUNTER reading of 1
MHz ±0.9
Hz.
25.
On the HP 3585A, press FREQUENCY
SPAN, 250 Hz, RES BW, 3 Hz. Step the RANGE
until
the
overload light just turns on and then increment
it
one
step. Allow one
sweep
to occur.
30 Hz Offset
(not applicable to units
equipped with Option 007, Relaxed Phase Noise Specifications)
26. On the HP 3585A, press MANUAL, CLEAR
A,
MKR
—
CF,
COUNTER.
27. On the HP 3585A, press OFFSET, ENTER OFFSET, CF STEP SIZE, 30 Hz, MANUAL, STEP UP
(key), NOISE LVL.
The
noise level
measurement
takes approximately 30 seconds. For
an accu¬
rate reading, allow at least
2
measurements
to be made before recording value. Record Measured
Noise Level (MNL) into
Table
4-20.
Table 4-20.
Phase Noise Measurement
Data
Step
27
29
31
34
36
Offset
30
100
1K
10K
100K
Measured Noise Level
[MNL, dBc
(1
Hz)]
2.202
GHz
6.902
GHz
13.402 GHz 19.502 GHz 26.032
GHz'
1 Applies
only to HP 8340B
28. On the HP 3585A, press COUNTER, NOISE
LVL,
OFFSET, CONT Return marker
to
peak
of IF
and
ensure COUNTER reading is 1
MHz ±0.9
Hz.
If necessary, adjust LO for
a
1 MHz
IF. If
the
IF
drifted more than
6
Hz, steps 26 through 28 must
be
repeated.
HP
8340B/41B
Performance Tests