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8902A-16
S E R V I C E N O T E
Supersedes:
None
8902A Measuring Receiver
Serial Numbers: 3920A0000/3920A9999
Unstable TRFL measurements at 10MHz
To Be Performed By: Agilent-Qualified Personnel or Customer
Parts Required:
P/N Description Qty.
08902-60141 Cable, Coax (W43 A16J2 to AT1J1, All units) 2
Cable (W55 A17J3 to S4J4, Option 030 ONLY)
8120-5780 Cable, Coax (W37 A17J2 to AT1J2, All units) 2
Cable (W54 A19J3 to S4J5, Option 030 ONLY)
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICA TI ON:
MODIFIC ATION RECOMMENDED
ACTION IMMEDIATELY STANDARDS:
CATEGORY: X ON SPECIFIED FAILURE LABOR: 1.0 Hour
LOCATION X CUSTOMER INSTALLABLE SERVICE RETURN USED RETURN
CATEGORY: ON-SITE INVENTORY: X SCRAP PARTS: X SCRAP
X SERVICE CENTER SEE TEXT SEE TEXT
AVAILABILITY: PRODUCT’S SUPPORT LIFE AGILENT RESPONSIBLE UNTIL: June 2004
AGREEABLE TIME
AUTHOR: DS PRODUCT LINE: 13
ADDITIONAL INFORMATION:
© AGILENT TECHNOLOGIES, INC. 2002
PRINTED IN U.S.A.
June 19, 2002
Page 1 of 2
Page 2 of 2 8902A-16
Situation:
A problem has been noted with certain Measuring Receivers (serial number prefix range noted above)
while performing Tuned RF Level (TRFL) measurements on a 10.000 MHz signal from approximately
0 to -30 dBm. Failure symptoms appear as unstable readings which drift approximately ±0.4 dB. The
problem is caused by incorrectly manufactured coax cables which have defective ground crimps. This
will cause RF feedthru into the A17 Mixer and A16 RF Detector assemblies. RF Power measurements
with the broadband power meter are not affected.
Solution/Action:
If TRFL measurements are not stable at 10 MHz and levels noted above, replace cables W43 and
W37. These two cables connect the RF Attenuator (AT1) to the RF Detector (A16) and Input Mixer
(A17) assemblies. Re-calibration is not required.
NOTE: If the Measuring Receiver has Option 030 with Opt 032-37 (High Selectivity
Measurements) replacement of coax cables W55 and W54 is also recommended. These cables
route the signal from switch S4 to the Input Mixer (A17) and LO Divider (A19) assemblies.
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