Agilent Technologies 8495 Service manual

Agilent 8494/95/96A/B
Attenuators
Operating and Service
Manual
Agilent Technologies
Notices
© Agilent Technologies, Inc. 2011
Warranty
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into a foreign language) without prior agreement and written consent from Agilent
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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
Safety Notices
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Items) and DFARS 227.7202-3 (Rights in
Commercial Computer Software or Computer Software Documentation).
2
CAUTION
A CAUTION 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 damage to the product or loss of important data. Do not proceed beyond a
CAUTION notice until the indicated
conditions are fully understood and
met.
WA R N I N G
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 WARNING notice until the indicated
conditions are fully understood
and met.
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
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.
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
3
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.
4
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
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Agilent 8494/95/96A/B Attenuators Operating and Service Manual
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Agilent 8494/95/96A/B Attenuators Operating and Service Manual
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
Environmental Specifications
Physical Dimensions
3
Operating Guides
15
16
17
19
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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Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Agilent 8494/95/96A/B Attenuators
Operating and Service Manual
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.
Agilent Technologies
9
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
10
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.
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Introduction
1
Instrument Options
Each instrument is specified with an option number which denotes
the configuration of the input and output connectors.
Table 1
Instrument Options
Option
Connector Description
001
Both connectors type-N female
002
Both connectors SMA female
[1]
003
Both connectors APC-7
[1] Option 003 is not available with the 8494A, 8495A, and 8496A.
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
11
1
Introduction
Specifications
Frequency Range and Attenuation
Table 2
Frequency Range and Attenuation
Product
8494A
8494B
8495A
8495B
8496A
8496B
Frequency Range
dc to 4 GHz
dc to 18 GHz
dc to 4 GHz
dc to 18 GHz
dc to 4 GHz
dc to 18 GHz
Attenuation
0 dB to 11 dB
0 dB to 11 dB
0 dB to 70 dB
0 dB to 70 dB
0 dB to 110 dB 0 dB to 110 dB
Steps
1 dB
1 dB
10 dB
10 dB
10 dB
8495B
8496A
10 dB
Attenuation Accuracy
(±dB): (Referenced from 0 dB)
Table 3
Attenuation Accuracy
8494A/B 8495A/B
8496A/B
8494A
Attenuation
Selection (dB)
dc–4
GHz
dc–12.4
GHz
12.4–18
GHz
dc–4
GHz
dc–12.4
GHz
12.4–18
GHz
dc–4
GHz
dc–12.4
GHz
12.4–18
GHz
12
8494B
8495A
8496B
1
10
0.2
0.3
0.7
0.2
0.5
0.6
0.2
0.5
0.6
2
20
0.2
0.3
0.7
0.4
0.7
0.8
0.4
0.7
0.8
3
30
0.3
0.4
0.7
0.5
0.9
1.2
0.5
0.9
1.2
4
40
0.3
0.4
0.7
0.7
1.2
1.6
0.7
1.2
1.6
5
50
0.3
0.5
0.7
0.8
1.5
2.0
0.8
1.5
2.0
6
60
0.3
0.5
0.8
1.0
1.8
2.4
1.0
1.8
2.4
7
70
0.4
0.6
0.8
1.2
2.1
2.8
1.2
2.1
2.8
8
80
0.4
0.6
0.8
–
–
–
1.3
2.4
3.2
9
90
0.4
0.6
0.8
–
–
–
1.5
2.7
3.6
10
100
0.4
0.6
0.9
–
–
–
1.6
3.0
4.0
11
110
0.5
0.7
0.9
–
–
–
1.8
3.3
4.4
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Introduction
1
Maximum SWR
Table 4
Maximum SWR
Instrument
Frequency Range (GHz)
Maximum SWR
8495A
dc to 4
1.35
8495B
dc to 8
8 to 12.4
12.4 to 18
1.35
1.5
1.7
8494A,
8496A
dc to 4
1.5
8494B,
8496B
dc to 8
8 to 12.4
12.4 to 18
1.5
1.6
1.9
Maximum Residual Attenuation
Table 5
Maximum Residual Attenuation
Instrument
Maximum Residual Attenuation
8494A,
8494B
0.6 dB + 0.09 dB/GHz
8495A,
8495B
0.4 dB + 0.07 dB/GHz
8496A,
8496B
0.6 dB + 0.09 dB/GHz
Attenuation Repeatability
±0.03 dB max (5 million cycles per section).
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
13
1
Introduction
RF Power Handling Capability
1 W average, 100 W peak with maximum pulse width of 10
microseconds (all models).
Operating Life
5 million cycles per section.
14
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Agilent 8494/95/96A/B Attenuators
Operating and Service Manual
2
Environmental Specifications &
Physical Dimensions
Environmental Specifications 16
Physical Dimensions 17
This chapter contains the environmental tests on the Agilent
8494/95/96A/B Attenuators that fully comply with Agilent
Technologies’ product operating environmental specifications.
The physical dimensions are illustrated in the
later section.
Agilent Technologies
15
2
Environmental Specifications & Physical Dimensions
Environmental Specifications
The Agilent 8494/95/96A/B Attenuators are designed to fully
comply with Agilent Technologies’ product operating environmental
specifications as shown in Table 6.
Table 6
Environmental Specifications
Temperature:
• Operating
0 °C to +55 °C
• Storage
–40 °C to +75 °C
Humidity:
• Operating
<95% relative
• Storage
<95% relative
Altitude:
• Operating
<4600 m (15000 ft)
• Storage
<7600 m (25000 ft)
Shock:
• Operating
10 Gs, six ms, on six sides, three blows
• Non-operating
500 Gs, 1.8 ms, in six directions
Vibration:
• Operating
EMC
16
5 Gs, 34 Hz to 2000 Hz
Radiated interference is within the requirements of
MIL-STD-461, RE02
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Environmental Specifications & Physical Dimensions
2
Physical Dimensions
Table 7 shows the physical dimensions of the Agilent
8494/95/96A/B Attenuators.
Table 7
Physical Dimensions
Instrument
Dimensions[1]
Weight[2]
8494A/B
Per Figure 1
15 oz
425 g
8495A/B
Per Figure 1
11 oz
312 g
8496A/B
Per Figure 1
15 oz
425 g
[1] Dimensions are for general information only. If dimensions are required for building special enclosures, contact your Agilent field engineer.
[2] Weight and width of the instrument varies with the option selected due to the type
of connectors.
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
17
2
Environmental Specifications & Physical Dimensions
Figure 1
18
Dimensions of Agilent 8494/95/96A/B Attenuators
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Agilent 8494/95/96A/B Attenuators
Operating and Service Manual
3
Operating Guides
Installation 20
Initial Inspection 20
Mating Connectors 21
Installation Instructions 21
Operating Instructions 22
Operator’s Check 23
Performance Tests 25
Service Instructions 25
This chapter describes the installation of the Agilent
8494/95/96A/B Attenuators. The operating instruction
quick- check procedure is included for verification test prior
to usage. Service instructions on the repair and maintenance
of the Agilent 8494/95/96A/B Attenuators are also included
in this chapter.
Agilent Technologies
19
3
Operating Guides
Installation
Initial Inspection
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 electrical performance are given
under “Operator’s Check” on page 23 or “Performance
Tests” on page 25.
2 If the contents are incomplete, if there is mechanical damage or
defect, or if the instrument does not pass the electrical
performance test, contact the nearest Agilent Technologies Sales
and Service office. Refer to the Service and Support information
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 instrument requires original shipping
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 matter of this manual for the Agilent Technologies
nearest to you. Attach a tag indicating the type of service
required, return address, model number and serial number.
Mark the container FRAGILE to insure careful handling. In any
correspondence, refer to the instrument by model number and
serial number.
20
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Operating Guides
3
Mating Connectors
Mating RF connectors used with the Option 001 must be type- N
male connectors, which comply with U.S. military standard
MIL- C- 39012. For Option 002, male SMA connectors must be used.
For Option 003, APC- 7 mating connectors must be used.
CAUTION
When installing the instrument, make sure that the connectors do not support
weight or bear torque. The preferred procedure is to set up all equipment in
position before connecting the instrument. Either connector may be used as
the input or output connector.
Installation Instructions
The attenuators may be installed with or without the base. The
base is removed by unscrewing the two fillister head screws from
the bottom of the base. The attenuator may be mounted without
the base by inserting two 4- 40 screws into the screw holes in the
bottom of the attenuator. Removing the base and mounting the
attenuator does not affect the performance of the attenuator.
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
21
3
Operating Guides
Operating Instructions
Do not apply RF power greater than 1 W average, or 100 W peak with a
maximum pulse width of 10 microseconds. If these limits are exceeded, the
attenuators may be damaged.
CAUTION
After the instrument is connected, the attenuation may be selected.
Turn counterclockwise to increase attenuation or clockwise to
decrease attenuation. Either connector may be used as the input
or output. Table 8 lists the attenuator switching order.
Table 8
Attenuator Switching Order
8494A/B Attenuator Sections
Atten
(dB)
1
1 dB
2
2 dB
3
4 dB
8495A/B Attenuator Sections
4
4 dB
0
1
×
×
10
×
20
×
30
×
4
5
×
6
7
×
50
×
×
60
×
×
70
22
3
40 dB
×
Atten
(dB)
1
10 dB
2
20 dB
3
40 dB
4
40 dB
0
×
×
10
×
20
×
30
×
40
×
50
×
×
60
×
×
70
×
×
×
×
80
×
×
90
×
×
×
100
×
×
×
110
×
10
11
2
20 dB
40
×
8
9
1
10 dB
0
2
3
Atten
(dB)
8496A/B Attenuator Sections
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Operating Guides
CAUTION
3
Do not attempt to force the switch between 0 and the highest value position
as there is a stop between these switch positions.
Operator’s Check
The operator's check allows the operator to make a quick check 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 detected by a
narrow- bandwidth voltmeter. The attenuator and detector range
switches are stepped together and the variations in level noted.
This verifies that each attenuator section is being properly
switched and checks the low- frequency accuracy of the attenuator.
NOTE
The SWR meter used in this check is calibrated for a square-law detector.
Therefore, the range changes and errors (read in dB) are twice that indicated by
the meter.
SWR meter
Function generator
Attenuator
Adapter
Output
50 Ω
Figure 2
Adapter
Input
Operator’s Check Setup
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
23
3
Operating Guides
Procedure
1 Connect equipment as shown in Figure 2 on page 23 with the
attenuator set to 0 dB attenuation.
2 Set the test oscillator to 0.3 Vrms at 1 kHz.
3 Set SWR meter range to 2 dB (expanded) [or for the 8494A/B to
10 dB (expanded)] and adjust its bandwidth to the center of the
adjustment range. Fine- tune the oscillator frequency to obtain
maximum meter indication.
4 Set attenuator and SWR meter range switch as listed in Table 9
and verify that the SWR meter indicates within the limits
shown.
Table 9
Attenuator and SWR Settings
SWR Meter Range
(dB)
Attenuation (dB)
Meter Indication (dB)
Minimum
Actual
Maximum
8494A/B 8495A/B 8494A/B 8495A/B 8496A/B 8494A/B 8495A/B 8494A/B 8495A/B 8494A/B 8495A/B
8496A/B
8496A/B
8496A/B
8496A/B
10
2
0
0
0
–
–
Set to 0.0 Set to 0.5
–
–
10
6
1
10
10
0.40
1.40
–
–
0.60
1.60
10
12
2
20
20
0.90
0.30
–
–
1.10
0.70
10
16
3
30
30
1.35
1.25
–
–
1.65
1.75
10[1]
22
4
40
40
1.85
0.15
–
–
2.15
0.85
12
26
5
50
50
0.35
1.10
–
–
0.65
1.90
12
32
6
60
60
0.85
0.00
–
–
1.15
1.00
[1]
36
7
70
70
1.30
0.90
–
–
1.70
2.10
12[1]
42[1]
8
–
80
1.80
–0.15
–
–
2.20
1.15
14
46[1]
9
–
90
0.30
0.75
–
–
0.70
2.25
14
52[1]
10
–
100
0.80
–0.30
–
–
1.20
1.30
14
56[1]
11
–
110
1.75
0.60
–
–
1.75
2.40
12
[1] Adjust range by 2 dB, if needed, to obtain an on-scale indication.
24
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
Operating Guides
3
Performance Tests
The Agilent 8494/95/96A/B Attenuators can be tested to the
accuracy of the specifications with a network analyzer or
equivalent equipment of suitable accuracy. If a network analyzer is
available, test instrument using the procedure in the analyzer's
operating manual.
Service Instructions
Adjustment
The Agilent 8494/95/96A/B Attenuators do not have internal
adjustments and should not be opened.
Repair
The Agilent 8494/95/96A/B Attenuators are not recommended for
repair as most components are not easily removed.
Maintenance
The connectors, particularly the connector faces, must be kept
clean. For instruction on connecting and care of your connectors,
refer to Microwave Connector Care Quick Reference
Card (08510- 90360).
Agilent 8494/95/96A/B Attenuators Operating and Service Manual
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Operating Guides
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Agilent 8494/95/96A/B Attenuators Operating and Service Manual