HP 8340B Manual page 47

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 ±0.9Hz. 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, 2S0 Hz, RES BW, 3 Hz. Allow one sweep to occur.
Ensure power at peak if IF is still 0 dBin.
12. Reduce LO frequency by 30 Hz (IF
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.
Step
13
14
16
19
21
22
Hz Offset Calibration
100
14. Reduce the LO frequency by 70 Hz (IF
1 kHz Offset Calibration
15. On the HP 3585A, press FREQUENCY SPAN, 2S00 Hz, RES BW, 30 Hz.
16. Reduce LO frequency by 900 Hz (IF
10 kHz Offset Calibration
17. Connect 1 MHz Notch Filter as shown in Figure 4-9. Select 1 MOhin input impedance on the HP
3585A.
HP
On the
18. 3585A,
19. Reduce LO frequency by 9 kHz (IF
4-48 Performance Tests
1.00003 MHz ±0.9Hz).
=
Table 4-19. Phase Noise Calibration Data
Offset (Hz)
30
100
1K
10K
lOOK
0
1.0001 MHz ±0.9 Hz) Repeat step 13.
=
1.001 MHz ±0.9 Hz). Repeat step 13.
=
press FREQUENCY SPAN, 2S kHz, RES BW, 100 Hz.
1.01 MHz ±0.9
=
Cal Data (dB)
CD =
CD
CD =
CD
CD =
IFDC =
Hz). Repeat step 13.
HP 8340B/41B