Agilent Technologies 8494A Service manual

Agilent Technologies
Agilent 8494/95/96A/B
Attenuators
Operating and Service
Manual

2 Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Notices
© Agilent Technologies, Inc. 2011
No part of this manual may be reproduced in
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tronic storage and retrieval or translation
into a foreign language) without prior agree-
ment and written consent from Agilent
Technologies, Inc. as governed by United
States and international copyright laws.
Manual Part Number
08494-90008
Edition
Third Edition, January 2011
Printed in Malaysia
Agilent Technologies, Inc.
Phase 3 Bayan Lepas Free Industrial Zone
Bayan Lepas, Penang 11900 Malaysia
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Safety Notices
CAUTION
A CAUTION notice denotes a haz-
ard. It calls attention to an operat-
ing procedure, practice, or the likes
of that, if not correctly performed
or adhered to, could result in dam-
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tant data. Do not proceed beyond a
CAUTION notice until the indicated
conditions are fully understood and
met.
WARNING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the likes of that, if not correctly
performed or adhered to, could
result in personal injury or death.
Do not proceed beyond a WARN-
ING notice until the indicated
conditions are fully understood
and met.

Agilent 8494/95/96A/B Attenuators Operating and Service Manual 3
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 extend allowed by the
Institute’s calibration facility, and to the calibration facilities of the
other International Standards Organization members.
WEEE Compliance
This product complies with the WEEE Directive (2002/96/EC)
marking requirements. The affixed label indicates that you must
not discard this electrical/electronic product in domestic household
waste.
Product Category: With reference to the equipment types in the
WEEE Directive Annex I, this product is classed as a "Monitoring
and Control Instrumentation" product.
Do not dispose in domestic household waste.
To return unwanted products, contact your local Agilent office, or
see www.agilent.com for more information.

4 Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Regulatory Markings
The CE mark is a registered trademark of the European Community. If it is
accompanied by a year, it indicates the year the design was proven.
The CSA mark is a registered trademark of the Canadian Standards Association.
This text indicates that this ISM device complies with Canadian ICES-001.
Cet appareill ISM est conforme a la norme NMB-001 du Canada.
This text indicates that the instrument is an Industrial Scientific and Medical
Group 1 Class A product (CISPER 11, Clause 4).
This symbol indicates the time period during which no hazardous or toxic
substance elements are expected to leak or deteriorate during normal use. Forty
years is the expected useful life of the product.

Agilent 8494/95/96A/B Attenuators Operating and Service Manual 5
Contacting Agilent
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Agilent 8494/95/96A/B Attenuators Operating and Service Manual 7
Contents
1 Introduction 9
Product Overview 10
Instrument Options 11
Specifications 12
Frequency Range and Attenuation 12
Attenuation Accuracy 12
Maximum SWR 13
Maximum Residual Attenuation 13
Attenuation Repeatability 13
RF Power Handling Capability 14
Operating Life 14
2 Environmental Specifications & Physical Dimensions 15
Environmental Specifications 16
Physical Dimensions 17
3OperatingGuides19
Installation 20
Initial Inspection 20
Mating Connectors 21
Installation Instructions 21
Operating Instructions 22
Operator’s Check 23
Performance Tests 25
Service Instructions 25

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9
Agilent 8494/95/96A/B Attenuators
Operating and Service Manual
Agilent Technologies
1
Introduction
Product Overview 10
Instrument Options 11
Specifications 12
Frequency Range and Attenuation 12
Attenuation Accuracy 12
Maximum SWR 13
Maximum Residual Attenuation 13
Attenuation Repeatability 13
RF Power Handling Capability 14
Operating Life 14
This manual contains operating instructions for the Agilent
8494/95/96A/B Attenuators. Included in the manual is
information required to install and test these attenuators.

10 Agilent 8494/95/96A/B Attenuators Operating and Service Manual
1 Introduction
Product Overview
Agilent 8494A/B, 8495A/B, and 8496A/B are 50- ohm coaxial
step attenuators.
For the 8494A/B, the attenuation can be varied in 1 dB steps, or
10 dB steps for the 8495A/B and 8496A/B. The attenuation shown
on the control knob is the additional attenuation added in the
signal path over the insertion loss of the attenuator in the 0 dB
position.
•Agilent 8494A/B instruments are four- section attenuators with a
range of 0 dB to 11 dB in 1 dB steps.
•The 8495A/B is a three- section attenuator with a range of 0 dB
to 70 dB in 10 dB steps.
•The 8496A/B is a four- section attenuator with a range of 0 dB
to 110 dB in 10 dB steps.
The attenuator sections are connected in cascade. Each section
consists of a precision, thin- film attenuator card, a lossless
thru- line and a ganged pair of edge line transmission lines. The
edge lines are flexed to make contact with either the attenuator
card or the thru- line. The edge line contacts are gold- plated leaf
springs which ensure long life and high repeatability. Low- torque
cams flex the edge lines. Table 8, “Attenuator Switching Order,” on
page 22 shows the switching arrangements.
CAUTION
Do not exceed the RF power rating of 1 W average or 100 W peak with a
maximum pulse width of 10 µs. Do not connect an attenuator RF input or
output connector to greater than ±7 Vdc. If the attenuator must be connected
to a device with a potential greater than ±7 Vdc, use a blocking capacitor.