Agilent Technologies 8496G Service manual

Agilent 8494/95/96G/H
Attenuators
Operating and Service
Manual
Agilent Technologies
Notices
© Agilent Technologies, Inc. 2011-2012
Warranty
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Manual Part Number
08495-90025
Edition
Fourth Edition, March 2012
Printed in Malaysia
Agilent Technologies, Inc.
Phase 3 Bayan Lepas Free Industrial Zone
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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
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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 8494/95/96G/H 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.
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marking requirements. The affixed label indicates that you must
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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 8494/95/96G/H 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 8494/95/96G/H Attenuators Operating and Service Manual
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Agilent 8494/95/96G/H Attenuators Operating and Service Manual
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Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Contents
1
Introduction
9
Product Overview 10
Instrument Options
14
Specifications 15
Frequency Range and Attenuation 15
Attenuation Accuracy 16
Maximum SWR 17
Maximum Residual Attenuation 17
Attenuation Repeatability 17
RF Power Handling Capability 18
Solenoid Drive 18
Solenoid Cable Connector 19
Operating Life 20
Switching Speed 20
2
Environmental Specifications & Physical Dimensions
Environmental Specifications
Physical Dimensions
3
Operating Guides
21
22
23
25
Installation 26
Initial Inspection 26
Mating Connectors 27
Installation Instructions 27
Operating Instructions 28
Operator’s Check 28
Performance Tests 31
Service Instructions 31
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Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Agilent 8494/95/96G/H Attenuators
Operating and Service Manual
1
Introduction
Product Overview 10
Instrument Options 14
Specifications 15
Frequency Range and Attenuation 15
Attenuation Accuracy 16
Maximum SWR 17
Maximum Residual Attenuation 17
Attenuation Repeatability 17
RF Power Handling Capability 18
Solenoid Drive 18
Solenoid Cable Connector 19
Operating Life 20
Switching Speed 20
This manual contains operating instructions for the Agilent
8494/95/96G/H Attenuators. Included in the manual is
information required to install and test these attenuators.
Agilent Technologies
9
1
Introduction
Product Overview
The 8494G/H, 8495G/H, and 8496G/H are 50- ohm coaxial
programmable step- attenuators. Each attenuator is composed of
three or four attenuator sections connected in cascade. Each
section consists of a precision, thin- film attenuator card, a lossless
thru- line, and a ganged pair of solenoid- actuated slab line
transmission lines. The slab lines are flexed by the solenoid
plungers to make contact with either the attenuator card or the
thru- line. The slab line contacts are gold plated leaf springs which
ensure long life and extremely high repeatability.
Note:
Solenoid (K4) and
associated
circuitry are not
available in
models 8495G
and 8495H.
From
solenoid
driver
circuits
+24 VDC
Thru line
Thru line
Thru line
Thru line
RF
output
RF input
Attenuator card
Figure 1
10
Attenuator card
Attenuator card
Attenuator card
Typical Four-Section Attenuator Schematic Diagram
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Introduction
1
Table 1 on page 11, Table 2 on page 12, and Table 3 on page 12
show the typical switching arrangement to increase the amount of
attenuation in an 8494G/H, 8495G/H, or 8496G/H in a linear
manner. To ensure specified performance, it is recommended that
the attenuator sections that are shown in the following tables be
used. With the attenuator programmed for 0 dB attenuation, the
resultant attenuation is the insertion loss (residual attenuation).
The 8494G/H has a minimum selectable step of 1 dB, while the
8495G/H and 8496G/H have a minimum selectable step of 10 dB.
The accuracy of the attenuators is within the limits given in
“Specifications” on page 15.
• The 8494G/H are four- section attenuators with a maximum
attenuation of 11 dB.
• The 8495G/H are three- section attenuators with a maximum
attenuation of 70 dB.
• The 8496G/H are four- section attenuators with a maximum
attenuation of 110 dB.
Table 1
8494G/H Attenuator Switching Order
8494G/H Attenuator Sections
Atten
(dB)
1
1 dB
2
2 dB
3
4 dB
4
4 dB
0
1
×
×
2
3
×
×
×
4
5
×
×
6
7
×
×
×
×
×
×
×
×
×
×
×
×
×
10
11
×
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
×
×
8
9
×
11
1
Introduction
Table 2
8495G/H Attenuator Switching Order
8494G/H Attenuator Sections
Atten
(dB)
1
10 dB
2
20 dB
3
40 dB
0
×
10
×
20
×
30
×
×
40
×
50
×
60
×
70
Table 3
×
×
×
×
8496G/H Attenuator Switching Order
8496G/H Attenuator Sections
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
12
×
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Introduction
1
Each solenoid requires a drive of 20 V to 30 V with a switching
current of approximately 125 mA[1] at 24 Vdc per section. The
solenoid switching time is less than 20 milliseconds including
settling time. Once switched, the solenoid plungers are held in
place by permanent magnets and the solenoid plungers
automatically disconnect the selected coil drive and connect the
opposite coil drive (see Figure 1 and Figure 2). This simplifies the
coil driver circuit design and reduces the amount of heat
dissipated by the solenoid coils since the solenoid coils are
energized only for the 20 milliseconds switching time.
Solenoid cable
connector jack
Solenoid driver
Any 75451 dual peripheral AND driver.
+24 V
Atten card pin
TTL Input
1820-0175
Solenoid drive pin
+5 VDC
Thru-line pin
Typical Solenoid IC Driver Circuit
(3 or 4 required)
Atten card pin
Thru-line pin
Switch or relay
contacts
Solenoid drive pin
+24 Vdc
Typical Solenoid Relay or Switch Driver
(3 or 4 required)
Figure 2
Typical Solenoid Coil Driver Circuits
[1] For serial number prefixes below 1722A, change 125 mA to 110 mA.
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
13
1
Introduction
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.
Instrument Options
Each instrument is specified with an option number which denotes
the configuration of the input and output connectors.
Table 4
Instrument Options
Option
Description
001
Type-N (f) connectors
002
SMA female connectors
003[1]
APC-7 connectors
024
[2]
24 Vdc supply voltage
011
5 V operation instead of standard 24 V
016
14-pin dip plug, 16-inch DC ribbon cable
060[2]
Viking to bare wire cable
[1] Option 003 is not available on the 8495G.
[2] Option 024 and 060 are default options unless specified otherwise.
14
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Introduction
1
Specifications
Frequency Range and Attenuation
Table 5
Frequency Range and Attenuation
Instrument
Frequency Range
Attenuation
8494G
dc to 4 GHz
0 dB to 11 dB in 1 dB steps
8494H
dc to 18 GHz
0 dB to 11 dB in 1 dB steps
8495G
dc to 4 GHz
0 dB to 70 dB in 10 dB steps
8495H
dc to 18 GHz
0 dB to 70 dB in 10 dB steps
8496G
dc to 4 GHz
0 dB to 110 dB in 10 dB steps
8496H
dc to 18 GHz
0 dB to 110 dB in 10 dB steps
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
15
1
Introduction
Attenuation Accuracy
(±dB): (Referenced from 0 dB)
Table 6
Attenuation Accuracy
8494G/H 8495G/H
8496G/H
8494G
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
16
8494H
8495G
8495H
8496G
8496H
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 8494/95/96G/H Attenuators Operating and Service Manual
Introduction
1
Maximum SWR
Table 7
Maximum SWR
Instrument
Frequency Range (GHz)
Maximum SWR
8495G
dc to 4
1.35
8495H
dc to 8
8 to 12.4
12.4 to 18
1.35
1.5
1.7
8494G,
8496G
dc to 4
1.5
8494H,
8496H
dc to 8
8 to 12.4
12.4 to 18
1.5
1.6
1.9
Maximum Residual Attenuation
Table 8
Maximum Residual Attenuation
Instrument
Maximum Residual Attenuation
8494G,
8494H
0.6 dB + 0.09 dB/GHz
8495G,
8495H
0.4 dB + 0.07 dB/GHz
8496G,
8496H
0.6 dB + 0.09 dB/GHz
Attenuation Repeatability
±0.03 dB max (5 million cycles per section).
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
17
1
Introduction
RF Power Handling Capability
1 W average, 100 W peak with maximum pulse width of 10
microseconds (all models).
Solenoid Drive
Table 9
18
Solenoid Drive
Solenoid
Coil Voltage
Switching Current
Nominal Coil Impedance
Option 024
24 V (20 to 30 V)
125 mA (at 24 V)
190 Ω
Option 011
5 V (4.5 to 7 V)
325 mA (at 5 V)
17 Ω
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Introduction
1
Solenoid Cable Connector
Refer also to Figure 3.
Table 10
Solenoid Cable Connector
Section
Solenoid Coil
Section 1
Section 2
Section 3
Section 4
Power
V+
ThruLine
Atten
Card
ThruLine
Atten
Card
ThruLine
Atten
Card
ThruLine
Atten
Card
PUR
YEL
BLK
GRN
ORN
BLU
BRN
WHT
RED
5
6
7
8
9
10
11
12
1
8494G/H
0 dB
1 dB
0 dB
2 dB
0 dB
4 dB
0 dB
4 dB
–
8495G/H
0 dB
10 dB
0 dB
20 dB
0 dB
40 dB
–
–
–
8496G/H
0 dB
10 dB
0 dB
20 dB
0 dB
40 dB
0 dB
40 dB
–
13
2
11
5
3
9
4
10
6
Cable Wire Color Code[1]
Connector Plug Pin Number[2]
Option 016
Flat Pack Plug Pin Number[3]
[1] Five-foot cable and mating plug assembly provided.
[2] Pin 1 Common solenoid drive (+24 Vdc).
[3] Pin 6 is common for all coils. Pins 1, 7, 8, 12, and 14 are not used.
(1)
(14)
Jack, front view
Plug, front view
(8)
(7)
Option 060
Plug, bottom view
Option 016
Figure 3
Solenoid Cable Pin Configuration
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
19
1
Introduction
Operating Life
5 million cycles per section.
Switching Speed
Maximum 20 milliseconds including settling time.
20
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Agilent 8494/95/96G/H Attenuators
Operating and Service Manual
2
Environmental Specifications &
Physical Dimensions
Environmental Specifications 22
Physical Dimensions 23
This chapter contains the environmental tests on the Agilent
8494/95/96G/H Attenuators that fully comply with Agilent
Technologies’ product operating environmental specifications.
The physical dimensions are illustrated in the
later section.
Agilent Technologies
21
2
Environmental Specifications & Physical Dimensions
Environmental Specifications
The Agilent 8494/95/96G/H Attenuators are designed to fully
comply with Agilent Technologies’ product operating environmental
specifications as shown in Table 11.
Table 11
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
22
5 Gs, 34 Hz to 2000 Hz
Radiated interference is within the requirements of
MIL-STD-461, RE02
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Environmental Specifications & Physical Dimensions
2
Physical Dimensions
Table 12 shows the physical dimensions of the Agilent
8494/95/96G/H Attenuators.
Table 12
Physical Dimensions
Instrument
Dimensions[1]
Weight[2]
8494G/H
8496G/H
Per Figure 4
16 oz
454 g
8495G/H
Per Figure 4
12 oz
340 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 8494/95/96G/H Attenuators Operating and Service Manual
23
2
Environmental Specifications & Physical Dimensions
Figure 4
24
Dimensions of Agilent 8494/95/96G/H Attenuators
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Agilent 8494/95/96G/H Attenuators
Operating and Service Manual
3
Operating Guides
Installation 26
Initial Inspection 26
Mating Connectors 27
Installation Instructions 27
Operating Instructions 28
Operator’s Check 28
Performance Tests 31
Service Instructions 31
This chapter describes the installation of the Agilent
8494/95/96G/H 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 8494/95/96G/H Attenuators are also included
in this chapter.
Agilent Technologies
25
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 28 or “Performance
Tests” on page 31.
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.
26
Agilent 8494/95/96G/H 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, 7 mm 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.
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.
The solenoid drive cable connector plug is connected to the
attenuator by aligning the plug (Pl) with the jack (Jl) on the
attenuator, and then pushing the plug over the jack. The plug is
removed by grasping the ribbed sides of the plug and squeezing
them together while pulling back until the plug clears the jack.
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
27
3
Operating Guides
Operating Instructions
CAUTION
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
Do not ground both solenoid drive pins at the same time. This causes rapid
cycling of the solenoid and could reduce the operating life of the attenuator.
The rapid cycling may produce a buzzing sound from the attenuator.
Either RF connector may be used as the input or output
connector. Connect the solenoid drive cable to the solenoid drive
connector (J1). By applying the proper voltage and grounds to the
proper pins of J1, the attenuator will either increase or decrease
the amount of attenuation as selected.
Operator’s Check
The Operator's Check is supplied to allow 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
28
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.
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Operating Guides
Test oscillator
Solenoid driver
circuits
Adapter
Attenuator
SWR meter
Adapter
50 Ω
Figure 5
3
Input
Operator’s Check Setup
Procedure
1 Connect equipment as shown in Figure 5 on page 29 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 8494G/H
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 13 and verify that the SWR meter indicates within the
limits shown.
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
29
3
Operating Guides
Table 13
Attenuator and SWR Settings
SWR Meter Range
(dB)
Attenuation (dB)
Meter Indication (dB)
Minimum
Actual
Maximum
8494G/H 8495G/H 8494G/H 8495G/H 8496G/H 8494G/H 8495G/H 8494G/H 8495G/H 8494G/H 8495G/H
8496G/H
8496G/H
8496G/H
8496G/H
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
12
36[1]
60
60
0.85
0.00
–
–
1.15
1.00
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
[1] Adjust range by 2 dB, if needed, to obtain an on-scale indication.
30
Agilent 8494/95/96G/H Attenuators Operating and Service Manual
Operating Guides
3
Performance Tests
The Agilent 8494/95/96G/H 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 8494/95/96G/H Attenuators do not have internal
adjustments and should not be opened.
Repair
The Agilent 8494/95/96G/H 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 8494/95/96G/H Attenuators Operating and Service Manual
31
3
Operating Guides
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Agilent 8494/95/96G/H Attenuators Operating and Service Manual