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E4401B-08
S E R V I C E N O T E
Supersedes:
None
E4401B 1.5 GHz Spectrum Analyzer
Serial Numbers US Manufactured: US39010101 / US41191757
Serial Numbers Malaysia Manufactured: MY41000001 / MY41300110
Firmware Update to Fix High Noise Floor on the Analyzer Screen.
To Be Performed By: Agilent-Qualified Personnel or Customer
Parts Required:
P/N Description Qty.
http://www.agilent.com/find/esa (External website)
http://mktwww.soco.agilent.com/field/service/signal/esa/firmware/ (Internal website)
*Note: If the instrument has option B72, Expanded Memory the instrument can be upgraded
to the latest and greatest firmware. Otherwise, A.07.05 is the highest revision allowed.
Situation:
There is an integrated circuit (ASIC), which comprises the VCO on the 1.5 GHz RF assembly. This
IC has a natural variation from batch to batch. The circumstance has been revealed that some batches
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICA TI ON:
MODIFIC ATION RECOMMENDED
ACTION X IMMEDIATELY STANDARDS:
CATEGORY: [[]] ON SPECIFIED FAILURE LABOR: 0.1 Hours
LOCATION X CUSTOMER INSTALLABLE SERVICE [[]] RETURN USED [[]] RETURN
CATEGORY: X ON-SITE INVENTORY: [[]] SCRAP PARTS: [[]] SCRAP
X SERVICE CENTER X SEE TEXT X SEE TEXT
AVAILABILITY: PRODUCT’S SUPPORT LIFE AGILENT RESPONSIBLE UNTIL: End of GMS period
[[]] AGREEABLE TIME
AUTHOR: bad PRODUCT LINE: 12
ADDITIONAL INFORMATION:
© AGILENT TECHNOLOGIES, INC. 2001
PRINTED IN U.S.A.
January 14, 2002
Page 1 of 3
Page 2 of 3 E4401B-08
of the VCO ‘slip clocking cycles’ when the VCO is set to its high extreme during the LO Alignment
and to its low extreme during a sweep. This can cause the auto alignment process to obtain and apply
corrupt data, which can ultimately cause a high noise floor or an error message on the analyzer screen
stating that the auto alignment process must be performed.
Solution/Action:
All 1.5 GHz ESA or EMC analyzer should be pre-screened using the screening test below. Not all
instruments are going to fail this screen. The failure will manifest itself by one of two ways:
1) High noise floor displayed on the analyzer screen.
2) System, Alignments, Align Now, All Required message on the analyzer screen that does not go
away even after performing the alignments process.
Perform the following screening test on the analyzer:
Press Preset, Frequency ->Start Freq 30 MHz, Stop Freq 300 MHz, BW/Avg. ->Resolution BW
120 kHz, Input ->Amptd. Ref ON.
You should see the Alignment signal (50 MHz) and harmonics on screen as shown below.
Press System, More 1 of 3, More 2 of 3, Service –2010 Enter, Service, Align, LO. If the instrument is
affected, then either the Align signal & harmonics will disappear or they will move around quickly
and erratically on screen. If this occurs, contact the customer and verify the latest shipping version of
ESA firmware can be upgraded in their instrument. If the instrument has option B72, Expanded
Memory the instrument can be upgraded to the latest and greatest firmware. Otherwise, A.07.05 is the
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