Agilent Technologies 8360 L Series, Service Manual

Page: 285 / 603

28. Mo dify calibration constan t #241, YTM Oset; Band 4, to maximize p o w er at the v ery
low end. P o w er may p eak t wice. Adjust to the low er p eak.
29. Mo dify calibration constan t #228, YTM Gain; Band 4, to maximize p o w er at the rst
division on the display . P o w er may p eak t wice. Adjust to the low er p eak.
Note
If there is no noticeable increase in p o w er in the next t w o adjustmen ts, leav e
the p oten tiometers at their preset p osition (fully clo c kwise).
30. Adjust A12R26 B4S1 for maximum high-end p o w er. P o w er may p eak t wice. Adjust to the
low er p eak.
31. Adjust A12R23 B4BP1 for maximum p o w er to optimize the 3rd through the 7th divisions.
Stop when the p o w er b egins to decrease. P o w er may p eak t wice. Adjust to the low er
p eak.
32. Repeat step 30.
33. Adjust band 4 SRD bias calibration constan ts as follo ws:
a. Incremen t calibration constan t #108, SRD Bias A; Band 4, to maximize low end
p o w er. Then decrease the calibration constan t v alue b y 15 coun ts.
b. Incremen t calibration constan t #121, SRD Bias B; Band 4, to maximize high end
p o w er. Then decrease the p o w er b y one third division ( 1/2 dB).
34. Repeat steps 28 through 33 un til the en tire band is p eak ed.
35. Record the v alue of calibration constan t #241, YTM Oset; Band 4 .
Step do wn the calibration constan t in 100 coun t steps and v erify that the en tire trace
shifts do wn ev enly . If the p o w er c hange is not uniform, rep eat steps 26 through 34.
Change calibration constan t #241 bac k to its original v alue.
Band 5 Adjustment (83640B/L and 83650B/L only).
36. On the syn thesizer, press:
4 ST ART 5 4 25.5 5 4 GHz 5 ( 83640B /L)
4 ST ART 5 4 26.5 5 4 GHz 5 ( 83650B /L)
4 STOP 5 4 32 5 4 GHz 5 ( 83640B /L)
4
STOP
5 4
33.5
5 4
GHz
5 ( 83650B /L)
37. Adjust calibration constan t #229, YTM Gain; Band 5, for maximum p o w er at the high
end of band 5. The high end p o w er may p eak t wice. If it do es, adjust the calibration
constan t to the low er p eak (where the v alue of the calibration constan t is the low er
n um b er).
38. Mo dify calibration constan t #242, YTM Oset; Band 5, to maximize low end p o w er.
P o w er may p eak t wice. Adjust to the low er p eak.
39. Set the band 5 SRD bias calibration constan ts as follows:
a. Incremen t calibration constan t #109, SRD Bias A; Band 5, to maximize low end
p o w er. Then decrease the calibration constan t v alue b y 15 coun ts.
b. Incremen t calibration constan t #122, SRD Bias B; Band 5, to maximize high end
p o w er. Then decrease the p o w er b y one third division ( 1/2 dB).
40. Repeat steps 37 through 39 un til p o w er is optimized o v er the full band.
41. Record the v alue of calibration constan t #242, YTM Oset; Band 5 .
Step do wn the calibration constan t in 100 coun t steps and v erify that the en tire trace
shifts do wn ev enly . If the p o w er c hange is not uniform, rep eat steps 37 through 40.
Change calibration constan t #242 bac k to its original v alue.
3-28 Adjustments
Amplifier/Multiplier Adjustments
Agilent 8360