Frequency Ranges - Agilent Technologies 83620A Service Manual

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a. Compare the manually adjusted Y F and Y M gain and o set
calibration constants (step 85) to the auto tracked calibration
constants. A large di erence in values (several hundred counts)
indicates a possible misadjustment. he auto tracking values are
correct.
b. If the band 3 values are within 500 counts of the limits of their ranges,
repeat the B3S1, B4S1, and B4BP1 adjustments with the doubler
disabled.
c. If the band 4 values are within 500 counts of the limits of the range,
repeat the B4S1 and B4BP1 adjustments with the doubler disabled
(unless you have just readjusted these adjustments in step b).
d. If the problem continues, it is most likely hardware-related. Refer to
the
Troubleshooting
88. For the HP 83630A/40A/50A, repeat step 87 for each frequency range
listed in able 3-5 and a sweep time of 1.5 seconds.
HP 83630A
20 to 26.5 GHz 20 to 26.5 GHz 20 to 26.5 GHz
89. On the synthesizer, set:
START 2.0 GHz
5 5 5
STOP 20 GHz
5 5 5
CONT SWEEP TIME
5
90. Set the synthesizer power level to the speci ed maximum leveled power.
Check for ALC oscillations or level squegging.
a. he SRD bias A or B calibration constants for the a ected band
might eliminate oscillation. he problem is with the A term if the
oscillations are near the beginning of the band. It is with the B term if
the oscillations are near the end of the band. SRD bias has a range.
It can be overbiased which causes level squegging. If so, decrease the
value of the SRD bias calibration constants and repeat the adjustment.
HP 8360
manual.
Table 3-5. Frequency Ranges
HP 83640A
26.5 to 40 GHz 26.5 to 40 GHz
1.5 sec
5 5 5
Amplifier/Filter Adjustments
HP 83650A
40 to 50 GHz
Adjustments 3-71