8490D
8491A/B
8493A,B,C
Coaxial Fixed Attenuators
11581/2A
11583C
Attenuator Sets
Operating and Service
Manual
Agilent Part Number: 08491-90077
Printed in USA
December 2001
Supersedes: July 2001
Notice
The information containe d in this doc ument is subject to change without
notice.
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Agilent Technologies, Inc
© Copyright 1994, 1999, 2001 Agilent Technologies, Inc
ii 849x and 1158x Attenuator Sets Operating and Service Manual
Warranty
Certification Agilent Technologies certifies that this product met its published specifications at the time of
shipment from the factory. Agilent Technologies further certifies that its calibration
measurements are traceable to the United States National Institute of Standards and
Technology (NIST, formerly NBS), to the extent allowed by the Institute’s calibrati on facility,
and to the calibration facilities of other International Standards Organization members.
W arran ty This Agilent Technologies system product is warranted against defects in
materials and workmanship for a period corresponding to the individual
warranty perio ds of its component prod ucts. Instruments are warranted fo r a
period of one year. During the warranty period, Agil ent Technologies will, a t
its option, either repair or replace products that prove to be defective.
W arr anty se rvice for produc ts insta lled b y Agilent a nd cert ain othe r produc ts
designated by Agilent will be perfor med at Buyer’s facilit y at no charge
within Agilent servic e travel areas. Outside Agilent se rvice travel areas,
warranty service will be perfor med at Buyer’s facility only upon Agilent’s
prior agreement and Buyer shall pay Agilent’s round trip travel expe nses. In
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For products returned to Agilent for warranty service, Buyer sha ll pr ep ay
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LIMITATION OF WARRANTY. The foregoing warranty shall not apply
to defects resulting from improper or inadequate maintenance by Buyer,
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product, or improper site prepa ration or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT
SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
849x and 1158x Attenuator Sets Operating and Service Manual iii
EXCLUSIVE REMEDIES. THE REMEDIES PROVIDED HEREIN ARE
BUYER’S SOLE AND EXCLUSIVE REMEDIES. AGILENT SHALL
NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED
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(refer to “Service and Support” on page iv).
Service and Support
Online assistance: www.agilent.com/find/assist
United S t ates
(tel) 1 800 452 4844
New Zealand
(tel) 0 800 738 378
(fax) (+64) 4 495 8950
Country Phone Number Fax Number
Singapore 1-800-375-8100 (65) 836-0252
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Philippines (632) 8426802
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People’s Republic
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800-810-0189 (preferred)
10800-650-0021
10800-650-0121
iv 849x and 1158x Attenuator Sets Operating and Service Manual
Safety and Regulato ry Information
Review this product and related documentation to familiarize yourself with
safety markings and instr uct ions before you operate the instr ument. This
product has been designed and teste d in acc ordance with international
standards.
WARNING The WAR NING notice denotes a hazard. It cal ls attention to a procedure,
practice, or th e like, that, if not cor rectly performed or adhered to, could result
in personal injury. Do not proceed beyond a WARNING noti ce until the
indicated conditions are fully understood and met.
CAUTION The CAUTION notice denotes a hazard. It calls attention to an operating
procedure, practice, or the like, which, if not correctl y performed or adhered
to, could r esult in damage to the product or loss of important data. Do not
proceed beyond a CAUTION notice until the indicat ed conditions are fully
understood and m et.
Instrument Markings
When you see this symbol on your instrument, you should refer to the instrument’s
!
1SM1-A This text indicates that the instrument is an Industrial Scientific and Medical Group 1
instruction manual for important information.
This symbol indicates hazardous voltages.
The laser radiation symbol is marked on products that have a laser output.
This symbol indicates that the instrument requires alternating current (ac) input.
The CE mark is a registered trademark of the European Community. If it is
accompanied by a year, it ind icates the year the design was proven.
The CSA mark is a registered trademark of the Canadian Standards Association.
Class A product (CISPER 11, Clause 4).
This symbol indicates that the power line switch is ON.
This symbol indicates that the power line s witch is OFF or in STANDBY position.
849x and 1158x Attenuator Sets Operating and Service Manual v
Safety Earth Ground
This is a S afety Class I product (provided with a protective earthing
terminal). An uninterruptible safe ty earth ground must be provid ed from the
main power source to the product input wiring terminals, power cord, or
supplied power cord set. Whenever it is like ly that the protection has been
impaired, the product must be made inoperative and secured against any
unintended operation.
Before Applying Power
Verify that the product is configured to m atch the available main power
source as described in the input power configuration instructions in this
manual. If this product is to be powered by autotransformer , make sure the
common terminal is connecte d t o the n eutral (groun ded) side of th e ac powe r
supply .
vi 849x and 1158x Attenuator Sets Operating and Service Manual
Description
Description
Attenuator Overview The 8490D, 8491A,B, and 8493A,B,C are small, light-weight, low-power,
50-ohm coaxial f ixed attenuators.
The attenuators cover br oad f requency r anges a nd choi ce of c onnec tor types.
Each model number has option numbers which correspond to attenuation
values.
Model Options Frequency Range Connector Type
8490D 003, 006, 010, 020,
030, 040
8491A 003, 006, 010, 020,
030, 040, 050, 060
8491B 003, 006, 010, 020,
030, 040, 050, 060
8493A 003, 006, 010, 020,
030
8493B 003, 006, 010, 020,
030
8493C 003, 006, 010, 020,
030, 040
dc to 50 GHz 2.4 mm (m), (f)
dc to 12.4 GHz Type N (m), (f)
dc to 18 GHz Type N (m), (f)
dc to 12.4 GHz SMA 3 mm (m), (f)
dc to 18 GHz SMA 3 mm (m), (f)
dc to 26.5 GHz 3.5 mm (m), (f)
Features • Ruggedness, reliability, and small size make these attenuators useful
both on the bench and in systems applications.
• Accuracy and low SWRs ma ke the attenuators wel l suited for extending
the range of se nsitive power meters for higher power measur ements and
applications such as calib ration standards and RF substitution
measurements.
• Each attenuator is tested with a vector network analyzer for attenuation,
and a plot of actual attenuation va lues is printed on the label attached to
the body of the attenuator (exc ept for the 8490D and 8493C).
849x and 1158x Attenuator Sets Operating and Service Manual 1
Description
Optional Calibr ation Data
Option UK6 calibration data, which is ge nerated by a network analyzer,
provides a ta bulated list of attenuation and SWRs at 26 to 67 frequencies
depending on the model number and frequency range. Option UK6
calibration data is available when attenuators are first purchased and
recalibrati ons are available through Agilent Technologies Service Centers.
Attenua tor Se ts The 11581A, 11582A, and 11583C are boxed sets of four fixed coaxial
attenuators of 3, 6, 10, and 20 dB as shown in Table 1.
Each attenuator set comes with a printed calibration report that gives the
actual attenua tion and reflectio n coefficient of each port at frequencies fr om
100 MHz to 26.5 GHz, at increments from 100 to 500 MHz.
Table 1 Boxed Sets of Four Attenuators
Attenuator Boxed Set Contents
11581A 8491A (3, 6, 10, and 20 dB)
11582A 8491B (3, 6, 10, and 20 dB)
11583C 8493C (3, 6, 10, and 20 dB)
2 849x and 1158x Attenuator Sets Operating and Service Manual
Specifications
The specificat ions are the perfor mance standards or li mits against which the
attenuators are te sted.
Table 2 Specificat ion s for 8490D Coaxial Attenuator
8490D
Attenuation (dB)
1
Option
003 2.5 3.9 4.8
006 5.4 6.9 7.8
010 9.4 10.9 11.3
020 19.2 21.3 21.7
Minimu m (GHz)
0 to 50
Maximum (GHz)
0 to 26.5
Specifications
Maxi mum (GHz)
26.5 to 50
030 29.2 31.3 31.7
040 38.2 42.5 42.5
SWR (maximum)
dc to 26.5 GHz 26.5 to 40 GHz 40 to 50 GHz
003 1.15 1.25 1.45
060 1.15 1.25 1.45
010 1.15 1.25 1.45
020 1.15 1.25 1.45
030 1.15 1.25 1.45
040 1.08 1.15 1.25
Maximum Input Power: 1 W avg, 100 W pk
Connectors (50 Ω): 2.4 mm
Dimensions: 1.06 in. (27 mm) 3, 6, 10, 20 dB
1.14 in. (29 mm) 30, 40 dB
Diameter: .312 in (8 mm)
1. Option numbers are the same as attenuation values. Option UK6 calibration data provides a hard copy of the
transmission and reflection data as tested on an network analyzer.
849x and 1158x Attenuator Sets Operating and Service Manual 3
Specifications
Table 3 Specificat ion s for 8491A,B , an d 8493A, B Coaxial Attenuators
8491A3 and 8493A
1
8491B,
1,3
and 8493B
1
Frequency Range dc to 12.4 GHz dc to 12.4 GHz 12.4 to 18 GHz
Attenuation Accuracy
2
3 dB ± 0.3 dB ±0.3 dB ±0.3 dB
±0.4 dB (8491C)
6 dB ±0.3 dB ±0.3 dB
±0.4 dB (8491C)
±0.4 dB
±0.5 dB (8491C)
10 dB ±0.5 dB ±0.6 dB
20 dB ±0.5 dB ±0.6 dB ±1.0 dB
30 dB ±1.0 dB ±1.0 dB
40 dB ±1.5 dB ±1.5 dB
50 dB ±1.5 dB ±1.5 dB
60 dB ± 2.0 dB ±2.0 dB
SWR dc to 8 GHz 8 to 12.4 GHz dc to 8 GHz 8 to 12.4 GHz 12.4 to 18 GHz
3 dB 1.25 1.35 1.25 1.35 1.5
6 dB 1.2 1.3 1.2 1.3 1.5
10 dB 1.2 1.3 1.2 1.3 1.5
20 dB 1.2 1.3 1.2 1.3 1.5
30 dB 1.2 1.3 1.2 1.3 1.5
40 dB
50 dB
60 dB
3
3
3
1.2 1.3 1.2 1.3 1.5
1.2 1.3 1.2 1.3 1.5
1.2 1.3 1.2 1.3 1.5
Maximum Input Power: 2 W avg, 100 W pk 2 W avg, 100 W pk
Connectors (50 Ω): 8491A: Type N
8493A: SMA
3
4
8491B, C: Type N
8493B: SMA
3
4
Dimensions:
8491A:
2-7/16 x 13/16 in dia.
67 x 21 mm
8493A:
1-9/16 x 1/2 dia.
40 x 13 mm
Weight: Net 8491A: 110 g (4 oz)
8493A: 30 g (1 oz)
8491B:
7/16 x 13/16 in dia.
67 x 21 mm
8491B, C: 110 g (4 oz)
8493B: 30 g (1 oz)
8493B:
1-9/16 x 1/2 in. dia.
40 x 13 mm
1. 40, 50, 60 dB attenuation not available in 8493A,B
2. Option numbers are the same as attenuation values. Option UK6 calibration data provides a hard
copy of the transmission and reflection data as tested on a network analyzer.
3. Mate with MIL-C-71 and MIL-C-39012 connectors
4. Miniature SMA type
4 849x and 1158x Attenuator Sets Operating and Service Manual
Table 4 Specifications for 8493C Coaxial
Attenuator
1
8493C
Frequency Range dc to 18 GHz 18 to 26.5 GHz
Attenuation Accuracy
3 dB ± 0.5 dB ±1.0 dB
6 dB ± 0.6 dB
10 dB ± 0.3 dB ± 0.5 dB
20 dB ± 0.5 dB ± 0.6 dB
30 dB ± 0.7 dB ± 1.0 dB
40 dB ± 1.0 dB ± 1.3 dB
50 dB N/A
60 dB N/A
2
Specifications
SWR dc to 8 GHz 8 to 12. 4 GHz 12.4 to 26.5 GHz
3 dB 1.10 1.15 1.25
6 dB 1.10 1.15 1.27
10 dB 1.10 1.15 1.25
20 dB 1.10 1.15 1.25
30 dB 1.10 1.15 1.25
40 dB 1.10 1.15 1.25
2
50 dB
60 dB
2
N/A N/A N/A
N/A N/A N/A
Maximum Input Power: 2 W avg, 100 W pk
Connectors (50 Ω): 3.5 mm
Dimensions: 3, 6, 10, 20 dB
1-15/16 x 5/16 in dia.
33.8 X 8 mm
30, 40 dB
1-7/16 x 5/16 in dia.
36.8 X 8 mm
Weight: Net 9.4 g (0.33 oz)
1. 50, 60 dB attenuation not available in 8493C.
2.. Option numbers same as attenuation values: e.g., Option 003 for 3 dB, Option 010 for 10 dB etc.
Option UK6 calibration data provides a hard copy of the transmission and reflection data as tested
on a network analyzer.
849x and 1158x Attenuator Sets Operating and Service Manual 5
Specifications
Table 5 and Table 6 apply to the following boxed sets of four attenuators.
• The 11581A att enuator set contains a 3, 6, 10, and 20 dB 8491A.
• The 11582A att enuator set contains a 3, 6, 10, and 20 dB 8491B.
• The 11583C atte nuator set contains a 3, 6, 10, and 20 dB 8493C.
Table 5 Accuracy of Insertion Loss Measurements (S21, S12)
Attenuation dc 4 to 12 GHz 12 to 18 GHz
3 dB ± 0.01 dB ±0.06 dB ±0.11 dB
6 dB ±0.01 dB ±0.07 dB ±0.11 dB
10 dB ±0.01 dB ±0. 07 dB ±0.12 dB
20 dB ±0.01 dB ±0. 08 dB ±0.13 dB
Table 6 Accuracy of Reflection Coefficient Measu r em ent s (S11, S
Operating Environment
Storage and Shipping Environment
22)
Model Number
4 to 12 GHz 12 to 18 GHz 4 to 12 GHz 12 to 18 GHz
11581A ± 0. 006 dB — ± 0.006 dB —
11582A ±0. 006 dB ±0.010 dB ±0.006 dB ±0. 006 dB
11583C ±0.007 dB ±0.007 dB ±0. 007 dB ±0.007 dB
The operating enviro nment of the attenua tors shoul d be within the following
limitations:
a. Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 55 °C
b. Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . < 95% relative at 40 °C
c. Altitude . . . . . . . . . . . . . . . . . . . . . . . . .< 4,600 meters (15,000 feet)
The attenuators should be stored in a clean, dry environment. The foll owing
environmental limi tat ions apply to both storage and shipment:
a. Temperature
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55 to 85 °C
b. Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . < 95% relative at 40 °C
c. Altitude . . . . . . . . . . . . . . . . . . . . . . . .< 15,300 meters (50,000 feet)
6 849x and 1158x Attenuator Sets Operating and Service Manual
Installation
Installation
Initial Inspecti o n 1. Inspect the shipping container for damage. If the shipping container or
cushioning material is damaged, it should be kept until the contents of
the shipment have been checked for completeness and the instrument
has been checked both mechanically and electrically.
❍ Check for mechanical damage such as scratches or dents.
❍ Procedures for checking electrica l performance are given under
“Operator’s Check” or “Performance Tests”.
2. If the contents are incomplete, if there is mechanical damage or defect,
or if the instrument does not pa ss the electr ica l performanc e test, con tact
the nearest Agilent Technologies Sales and Service office. Refer to the
Service and Support infor mation in the front matter of this manual.
Agilent Technologies will arrange for repair or replacement of the
damaged or defective equipment. Keep the shipping materials for the
carrier’s inspection.
3. If you are returning the instrument under warranty or for service,
repackaging the inst rument requires original shippi ng containers and
materials or their equivalents. Agilent Technologies can provide
packaging materials identical to the original materials. Refer to Service
and Support information in the front matte r of this manual for the
Agilent Technologie snearest you. Attach a tag indicating the type of
service requ ired, r eturn a ddre ss, mo del number, and serial number. Mark
the container FRAGILE to insure careful ha ndling. In any
correspond e nc e, re fer to t he instrument by model number and serial
number.
Returning attenuators under warranty
“Bad contacts” attenuators are returnable under warranty while “burned out”
attenuators are not. These terms are defined as f ollows:
❍ “Bad Contacts”: Attenuation is within spec ifications at 8 GHz or
higher; attenuation is at least 3 to 5 dB higher than specification at
dc and 1 kHz.
❍ “Burned Out”: Attenuation is at least 3 to 5 dB higher than
specification at dc and entire rated frequency range.
849x and 1158x Attenuator Sets Operating and Service Manual 7
Operating Instructions
Operating Instructions
Operator’s Check The oper ator’ s check is s upplied to a llo w the operator to make a quick che ck
of the instrument prior to use or if a failure is suspected.
Description
The attenuator is driven from a 50-ohm signal source at 1 kHz. The output
level from the attenuator is dete cted by a narrow-bandwidth voltmeter (that
is, the SWR meter). A reference level is set up on the detector using a
through connect ion in place of the attenuator. The attenuator is then inserted
and the change in the detector level is noted. This checks the low frequency
accuracy of the attenuator.
NOTE The SWR meter used in this check is calibrated for a square- law detector
and therefore the range changes and errors (read in dB) are twice that
indicated by the meter.
Quick-C hec k P roce du re
1. Connect the equipment as shown in the figure below except remove the
attenuator and connec t the adap ters directly together.
TEST OSCILLATOR
OUTPUT
50
2. Set the test oscillator to 0.3 Vrms at 1 kHz.
3. Set the SWR meter range to 2 dB (expanded) or for the 3 dB , 6 dB, and
10 dB (expanded) as appropriate and adjust its bandwidth to the center
of the adjustment range. Fine tune the oscillator frequency to obta in
maximum meter indication. Adjust the oscillator output to obtain the
SWR meter reading in the table below.
SWR METER
Ω
ATTENUATOR
ADAPTER ADAPTER
INPUT
4. Connect the attenuator into the system, adjust the SWR meter range
switch as listed below, and verify that the SWR meter indicates within
the limits shown.
8 849x and 1158x Attenuator Sets Operating and Service Manual
Table 7 SWR Verification
Operating Instructions
Attenuation SWR Meter Range (dB)
Minimum Actual Maximum
0 (System Cal) 2 (or 10)* Set to 0.5 (or 0.0)*
3101.35 1.65
6120.85 1.15
10 14 0. 75 1.25
20 12 0. 25 0.75
30 16 1. 00 2.00
40 22 −0.25 1.25
50 26 0.75 2.25
60 32 −0.50 1.50
* Set SWR meter range to 10 dB and power level to 0.0 dB for 3 dB, 6 dB, and 10 dB attenuators only.
Meter Indication (dB)
849x and 1158x Attenuator Sets Operating and Service Manual 9
Making Connections
Making Connections
With any of the att en uators, do not depend upon the attenuator it self to bear
any force. The units that the at tenuator is connecte d to should bear their own
weight and force. The attenuator s are bidi rectiona l, tha t is, the signal may be
inserted from either end.
8490D The 8490D 2.4-mm connectors mate with other 2. 4-mm connector s of the
opposite sex.
2.4-mm Male Connector 2.4-mm Female Connector
See Detail "A"
See Detail "B"
Center
Conductor
Detail "A" Detail "B"
Pin Depth
Mating Plane
Outer
Conductor
Mating Plane
Center
Conductor
Mating Plane
Outer
Conductor
Mating Plane
Pin Depth
Figure 1 2.4-mm Connector Diagram
10 849x and 1158x Attenuator Sets Operating and Service Manual
Making Connections
8491A,B The 8491A,B type-N connectors mate with all type -N connectors whose
dimensions conform to IEE STD 287.
CAUTION Do not mate with 0.071 inch diameter pin male connector. Damage will
result.
Type-N Male Connector Type-N Female Connector
Center Conductor
Center Conductor
Mating Plane
0.207 inch (5.258 mm)
minimum
Outer Conductor
Mating Plane
Figure 2 Type-N Connector Diagra m
Mating Plane
Outer Conductor
Mating Plane
0.207 inch (5.258 mm)
maximum
849x and 1158x Attenuator Sets Operating and Service Manual 11
Making Connections
8493A,B The 8493A,B has a male SMA jack on one end and a female SMA on the
other. These connectors mate with the opposite sex SMA connectors.
SMA Male Connector
See Detail "A"
See Detail "B"
Center
Conductor
Detail "A" Detail "B"
Pin Depth
Mating Plane
Outer
Conductor
Mating Plane
Mating Plane
Mating Plane
SMA Female Connector
Center
Conductor
Outer
Conductor
Pin Depth
Figure 3 SMA Connector Diagram
12 849x and 1158x Attenuator Sets Operating and Service Manual
Making Connections
8493C The 8493C has a male 3.5-mm connector on one end and a female 3.5-mm
connector on the other side. Thes e connectors mate with the opposite sex
3.5-mm or SMA connectors.
CAUTION Continued mating with SMA connectors could degrade the 3.5-mm
connector.
3.5-mm Male Connector 3.5-mm Female Connector
See Detail "A"
See Detail "B"
Center
Conductor
Mating Plane
Center
Center
Conductor
Conductor
Mating Plane
Mating Plane
Detail "A" Detail "B"
Outer
Conductor
Mating Plane
Pin Depth
Outer
Outer
Conductor
Conductor
Mating Plane
Mating Plane
Pin Depth
Pin Depth
Figure 4 3.5-mm Connector Diagram
849x and 1158x Attenuator Sets Operating and Service Manual 13
Performance Tests
Performance Tests
The attenuators c an be tested to the acc urac y of the specifications in Table 1
with a network analyzer or equivalent equipment of suitable accuracy. If a
network analyzer is available, test the instrument using the procedure in the
analyzer’s operating manual.
Service Instructions
Repair The 8490D, 8491A,B the 8493A,B,C attenuators are not recommended for
repair since the cards must be mounted in cartridges to test and testing c osts
more than a replacement attenuator.
Maintenance The connectors, particularly the connector faces, must be kept clean. This is
especially true of the 8493A,B,C.
For instruction on connecting and care of your connectors, re fer to the
Microwave Connector Care Quick Reference Card (08510-90360).
Replaceable Parts
Table 8 lists the replaceable parts which are the only parts that can be
replaced without access to the interior of the attenuator.
Table 8 Replaceable Parts
Description Part Number
Foam Pad (top, all sets) 9220-1291
Foam Pad (bottom, all sets) 9220-3697
Box, Walnut (all sets) 9211-1009
Inner Conductor Contact (8492A) 1250-0816
14 849x and 1158x Attenuator Sets Operating and Service Manual
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