83624A-02
SERVICE NOTE
SUPERSEDES: NONE
8360 Series Synthesized Sweeper
Serial numbers:
This service note effects instruments with serial numbers below the serial numbers listed.
83620A - 0000A00000 / 3420A02333
83620B - 0000A00000 / 3614A00258
83622A - 0000A00000 / 3420A00368
83622B - 0000A00000 / 3614A00118
83623A - 0000A00000 / 3420A01381
83623B - 0000A00000 / 3614A00209
83623L - 0000A00000 / 3614A00127
83624A - 0000A00000 / 3420A00382
83624B - 0000A00000 / 3614A00122
83630A - 0000A00000 / 3420A00872
83630B - 0000A00000 / 3614A00178
83630L - 0000A00000 / 3614A00136
83640A - 0000A00000 / 3420A01198
83640B - 0000A00000 / 3614A00185
83640L - 0000A00000 / 3614A00151
83650A - 0000A00000 / 3420A00715
83650B - 0000A00000 / 3614A00159
83650L - 0000A00000 / 3614A00128
DATE: January 1997
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICATION:
MODIFICATION RECOMMENDED
ACTION
CATEGORY:
LOCATION
CATEGORY:
AVAILABILITY:PRODUCT'S SUPPORT LIFE AGILENT RESPONSIBLE UNTIL: January 1999
AUTHOR: DM ENTITY: 5320 ADDITIONAL INFORMATION:
IMMEDIATELY
ON SPECIFIED FAILURE
AGREEABLE TIME
CUSTOMER INSTALLABLE
ON-SITE
SERVICE CENTER
© 1997 AGILENT TECHNOLOGIES
PRINTED IN U.S.A.
STANDARDS:
LABOR 1.0 Hours
SERVICE
INVENTORY:
RETURN
SCRAP
SEE TEXT
USED
PARTS:
Continued
RETURN
SCRAP
SEE TEXT
1 of 3
Page 2 Service Note 83624A-02
Duplicated Service Notes:
83620A-02
83620B-02
83622A-02
83622B-02
83623A-02
83623B-02
83623L-02
83624A-02
83624B-02
83630A-03
83630B-02
83630L-02
83640A-02
83640B-02
83640L-02
83650A-03
83650B-02
83650L-02
Situation:
An oscillation has been discovered on a few A38 Dual Modulators (5086-7602). The oscillations
appear as a crossing spur between 16 GHz and 19 GHz above the specified spur level. The spur
is a single sideband spur that moves in the opposite direction as the carrier. The spur is offset
from the carrier between 0 to 200 MHz. The amount of offset changes the same amount the carrier frequency is tuned.
A small number of dual modulators have this problem. When the problem first occurred is not
know. When the oscillation is present it occurs between 0 and 15 degrees C. In a very few cases
the oscillation have occurred at room temperature. Our analysis indicates this is not a reliability
problem and the oscillation will not get worse with time. Dual modulators are used in standalone
models only.
Solution/Action:
This problem is difficult to verify. When the oscillation occurs at room temperature there is a
chance to observe the spur. When the oscillation occurs below room temperature, it is next to im-
possible to observe the spur unless the instrument’s temperature can be lowered to 0 degrees C.
When the symptoms match those described and the problem occurs below room temperature, the
recommendation is to spend up to 1 hour troubleshooting the problem at room temperature if the
temperature can not be lowered, and if the problem can not be verified, replace the A38 Dual
Modulator.
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