39
Applications
HP fixed and step attenuators
1
find use in a wide variety
of applications for signal conditioning and level control.
• Reducing signal levels
• Matching impedances of sources and loads
• Measuring gain or loss of a two-port device
Key Specifications
• SWR
• Accuracy
• Repeatability
• Life
SWR
Most attenuators use some form of distributed
thin-film attenuating element, designed to operate over
multi-octave ranges and for low SWR match at input and
output. The SWR characteristic is controlled with careful
design of the element as well as the transition from RF
connector to the element's planar geometry.
When an attenuator is inserted into a test network, the
interaction of its SWR and the network SWR results in
frequency-varying mismatch which degrades the accuracy
of the measurement. The amount of variation often
exceeds the flatness specification of the attenuator. As
an example, if, at a given frequency, a 3 dB attenuator
with SWR of 1.22 at each port is inserted into a microwave
network that has a source and load SWR of 1.35, the variation from the expected 3 dB change could be as great as
±0.5 dB. This change is due to SWR alone and points out
the importance of the SWR specification in a precision
attenuator.
Accuracy
The accuracy of an attenuator directly affects the
uncertainty of the measurement where the attenuator is
used. In many measurement and metrology applications,
attenuators are the basic standard against which other
components and instruments are calibrated.
HP attenuator accuracy specifications always
include the effect of frequency response. And,
HP attenuators use "edgeline" coaxial structure
technology to achieve low insertion loss and
SWR resulting in better accuracy.
HP attenuators achieve flat frequency response and
high accuracy through the use of thin-film attenuator
cards. These cards are composed of high-stability tantalum nitride resistive film, deposited on sapphire or
alumina substrates. Advanced design and state-of-theart processes in the deposition stages allow precise
control of the geometry and thus the attenuation
value. The result is very flat frequency response and
greater accuracy.
Ultimate specified accuracy of RF/microwave
attenuators is limited by the accuracy to which
National Institute of Standards and Technology (NIST)
can measure, plus the uncertainty of the measurement
transfer process which calibrates the production test
equipment. See Figure 1, on the next page, for an
accuracy traceability example. At HP, performance to
specifications is verified by fully testing each attenuator with an ATE system including an automatic network analyzer (ANA). In turn, the ANA is periodically
calibrated using standards traceable to NIST.
Each published specification has been established
using a "specification budget" process. This process
provides for "guardbands" to account for transfer
uncertainties between NIST, HP Metrology Labs, and
the HP production test systems. Figure 2, on the next
page, shows how the specification budget
is allocated.
1
See Waveguide chapter for additional products.
6
Attenuators
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Attenuators
40
Repeatability
Fixed attenuators are often used as standards of
reference in microwave measurements. Therefore, the
accuracy of the measurement depends not only on the
reference accuracy, but on the repeatability of the insertion processes. Typical production test situations might
require hundreds of connects/disconnects per day. So,
measurement repeatability depends strongly on the
connectors used. HP attenuators use precision type-N
and APC-7 connectors, with repeatability that exceeds
the International Electrotechnical Commission (IEC)
standard for 7-mm connectors. For higher frequencies,
HP uses 3.5-mm connectors that are fully SMA compatible, but are more rugged and repeatable than SMA. For
applications to 50 GHz, HP uses 2.4-mm connectors that
also have larger mating surfaces for rugged and repeatable
connections. Design verification testing of 3.5-mm connectors showed virtually no test deterioration even after
1000 connections. For step attenuators, the repeatability of the internal RF connections is also of concern. HP
uses an "edgeline" transmission line structure in which
the outer conductor is a continuous ground plane and
only the center conductor is switched to insert or
remove an attenuation step. Keys to achieving long
term repeatability include precision control of all dimensions that affect contact pressure, careful selection and
control of plating processes, and careful monitoring and
control of the assembly process. The result is a step attenuator with repeatability specified at 0.03 dB maximum over
5 million cycles per section.
Life
The life of step attenuators is usually specified in cycles,
i.e. the number of times a given attenuator section
switches from one position to another and back. HP
determines life by cycling attenuators to the point of
degradation. Typically, HP attenuators in life cycle tests
perform to specification for at least twice as many cycles
as warranted. HP step attenuator families have a specified
life of 5 million cycles per section (except the HP 355E,F).
This long life results in lower cost of ownership by
reducing periodic maintenance, downtime and repairs.
Figure 1. Accuracy traceability example.
Figure 2. Guardband example.
Attenuators
0.15
0.12
0.09
0.06
0.03
Actual Value
(dB)
21.0
20.8
20.6
20.4
20.2
20.0
19.8
Attenuation (dB)
19.6
19.4
19.2
19.0
0
–0.03
–0.06
–0.09
–0.12
–0.15
Published
Specification
±
1 dB
HP Production
HP Calibration
Laboratory
HP Reference
Standard
Calibrated
by NIST
±0.03 dB
Uncertainty in
Transfer Accuracy
Standard
HP Production
Specification
±
0.8 dB
Guardband
±0.10 dB
Test Standard
±0.15 dB
Typical
Performance
±0.5 dB
41
HP 8491A,B,C, 8492A, 8493A,B,C
Hewlett-Packard coaxial fixed attenuators provide
precise attenuation, flat frequency response, and low
SWR over broad frequency ranges. Attenuators are
available in nominal attenuations of 3 dB and 6 dB, as
well as 10 dB increments from 10 dB to 60 dB. These
attenuators are swept-frequency tested to ensure
specification compliance at all frequencies. Calibration
points are provided on a nameplate chart attached to
each unit (except for the HP 8491C).
HP 8498A High Power Attenuator
The HP 8498A Option 030 is designed to meet the
needs of high power attenuation applications in the RF
and microwave frequency range. It is a 25 watt average,
30 dB fixed attenuator with a frequency range of dc to
18 GHz. The maximum peak power specification
is 500 watts (dc to 5.8 GHz) and 125 watts (5.8
to 18 GHz). Available only in a 30 dB version,
the unit offers a 1.3 SWR and ±1 dB accuracy
at 18 GHz. Large heat-dissipating fins keep the
unit cool even under continuous maximum input
power conditions.
HP 8490D 50-GHz Fixed Attenuator
Hewlett-Packard coaxial fixed attenuators have been
the standard for accurate flat response and low SWR.
The HP 8490D offers exceptional performance to 50 GHz
using the 2.4-mm connector. Attenuation values available
are 3, 6, 10, 20, 30, and 40 dB. Ideally suited for
extending the range of sensitive power meters, or for
use as calibration standards, these broadband attenuators
are manufactured with the same meticulous care as
their lower frequency counterparts.
HP 11581A, 11582A, 11583A,C Attenuator Sets
A set of four attenuators (3, 6, 10 and 20 dB)
is furnished in a walnut accessory case. The HP 11581A
set consists of HP 8491A attenuators; the HP 11582A
set, HP 8491B attenuators; the HP 11583A set,
HP 8492A attenuators; and the HP 11583C set,
HP 8493C attenuators. These sets are ideal for
calibration labs or where precise knowledge of
attenuation and SWR is desired.
HP 86213A Attenuator Set
Provides a set of four, 3, 6, 10 and 20 dB, 75 ohm type-N
attenuators in a walnut accessory case (HP 0955-0765,
0955-0766, 0955-0767, and 0955-0768), respectively.
Used for reducing power and improving match. SWR
is 1.12 to 1.3 GHz and 1.3 to 3 GHz. Attenuation
accuracy is ±0.5 dB.
HP 8493A
HP 8492A
HP 8491A/B/C
HP 8490D
HP 8498A
6
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Attenuators
Frequency Maximum
HP Range Maximum Input
Attenuation Accuracy (± dB)
Model (GHz) SWR Power 3 dB 6 dB 10 dB 20 dB 30 dB 40 dB 50 dB 60 dB Connectors
8491A dc to 12.4 1.2 to 8 GHz 0.3 0.3 0.5 0.5 1.0 1.5 1.5 2 N (m, f)
3 to 30 dB 1.3 to 12.4 GHz
40 to 60 dB
8491B dc to 18 1.2 to 8 GHz 0.3 0.3 to 12.4 GHz 0.6 0.6 to 12.4 GHz 1.0 1.5 1.5 2 N (m, f)
3 to 30 dB 1.3 to 12.4 GHz 0.4 to 18 GHz 1.0 to 18 GHz
40 to 60 dB 1.5 to 18 GHz
8491C dc to 18 1.2 to 8 GHz 0.3 to 12.4 GHz 0.4 to 12.4 GHz 0.6 0.6 to 12.4 GHz 1.0 — — — N (m, f)
3 to 30 dB 1.3 to 12.4 GHz 0.4 to 18 GHz 0.5 to 18 GHz 1.0 to 18 GHz
1.5 to 18 GHz
8492A dc to 18 1.15 to 8 GHz 0.3 0.3 to 12.4 GHz 0.6 0.6 to 12.4 GHz 1.0 1.5 1.5 2 APC-7
3 to 30 dB 1.25 to 12.4 GHz 0.4 to 18 GHz 1.0 to 18 GHz
40 to 60 dB 1.35 to 18 GHz
8493A dc to 12.4 1.2 to 8 GHz 0.3 0.3 0.5 0.5 1.0 — — — SMA (m, f)
3 to 20 dB 1.3 to 12.4 GHz
30 dB
8493B dc to 18 1.2 to 8 GHz ±0.3 dB 0.3 to 12.4 GHz 0.6 0.6 to 12.4 GHz 1.0 — — — SMA (m, f)
3 to 20 dB 1.3 to 12.4 GHz 0.4 to 18 GHz 1.0 to 18 GHz
30 dB 1.5 to 18 GHz
8493C dc to 26.5 1.1 to 8 GHz 0.5 to 18 GHz 0.6 0.3 0.5 0.7 1.0 — — 3.5 mm (m, f)
3 to 30 dB 1.15 to 12.4 GHz 1.0 to 26.5 GHz
40 dB 1.25 to 26.5 GHz
1
0.6 0.5 0.6 1.0 1.3
8498A dc to 18 1.15 to 8 GHz 25 W avg. — — — — 1.0 — — — N (m, f)
30 dB 1.25 to 12.4 GHz 500 W peak
1.30 to 18 GHz (dc to 5.8 GHz)
125 W peak
500 W/ms
max. per pulse
(5.8 to 18 GHz)
Specifications
Fixed
Specifications
Frequency
Range Maximum
Option: 003 006 010 020 030 040
HP Model (GHz) Input Power Atten. 3 dB 6 dB 10 dB 20 dB 30 dB 40 dB
Connectors
8490D dc to 50 1 W avg. Attenuation: Min: 0 to 50 GHz 2.5 5.4 9.4 19.2 29.2 38.2
Max: 0 to 26.5 GHz 3.9 6.9 10.9 21.3 31.3 42.5
Max: 26.5 to 50 GHz 4.8 7.8 11.3 21.7 31.7 42.5
SWR: Max: 0 to 26.5 GHz 1.15 1.15 1.15 1.15 1.15 1.08
Max: 26.5 to 40 GHz 1.25 1.25 1.25 1.25 1.25 1.15
Max: 40 to 50 GHz 1.45 1.45 1.45 1.45 1.45 1.25
2.4 mm (m, f)
1
1.27 for Option 006.
2 W avg.
100 W peak
Indicates QuickShip availability
. Contact HP Direct or your local HP sales representative to confirm QuickShip.
42
43
Fixed
Fixed Attenuator Ordering Information
A
8
(0.312)
7.6
(0.30)
2 Flats 180° apart
7 (0.275) across
Dimension A
3, 6, 10, 20 dB: 27 (1.06)
30, 40 dB: 29 (1.14)
HP 8490D
13
(0.50)
40
(1.55)
19
(0.75)
A
8
(0.312)
8
(0.312)
2 Flats 180°
apart
6.4 (0.25) across
8
(0.312)
Dimension A
3, 6, 10, 20 dB: 33.8 (1.330)
30, 40 dB: 36.8 (1.450)
HP 8493C
HP 8493A,B
Dimensions are in mm (inches) nominal, unless otherwise specified.
HP 84 9 Option Option
0D: dc to 50 GHz 003: 3 dB UK6: Commercial calibration
1A: dc to 12.4 GHz 006: 6 dB test data with certificate
1B: dc to 18 GHz 010: 10 dB
1C: dc to 18 GHz 020: 20 dB
UKS: Commercial calibration certificate
2A: dc to 18 GHz 030: 30 dB
3A: dc to 12.4 GHz 040: 40 dB
2
3B: dc to 18 GHz 050: 50 dB
2
3C: dc to 26.5 GHz 060: 60 dB
2
8A: dc to 18 GHz
HP 8490/91/92/93/98 Series Ordering Example
1
3C
010
UK6
1
Each order must specify an attenuation option.
2
Not available on all models. See specification table.
Frequency Range Attenuation Calibration Documentation
6
Attenuators
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Programmable and Manual Step
44
Step Attenuator Selection Guide
The manual and programmable
HP 355 series attenuators offer
exceptional attenuation accuracy to
1 GHz; 0.1 dB to 1 kHz, 0.25 dB to
500 MHz, 0.35 dB to 1 GHz. They
feature BNC (f) RF connectors, with
optional type-N (Option 001) and
TNC (Option 005) also available. To
achieve 1 dB steps up to a range
of 132 dB, serially connect two
attenuators using a standard
UG-491A/U BNC (m)-to-BNC (m)
adapter. Programmable HP 355EF
models feature a 7-pin connector.
To protect your transistor driver
against transients during the
switching cycle, order Option 007 to
install a protective diode between
each solenoid and driver.
HP 355C (0 to 12 dB, 1 dB steps)
HP 355D (0 to 120 dB, 10 dB steps)
HP 355E (0 to 12 dB, 1 dB steps)
HP 355F (0 to 120 dB, 10 dB steps)
HP 355 Series Specifications
HP 355C,D
Frequency Range
Step Attenuation
Size Range dc to 1000 MHz dc to 4 GHz dc to 18 GHz dc to 26.5 GHz dc to 40 GHz
0 to 11 dB 8494A 8494B
0 to 12 dB 355C
0 to 70 dB 8495A 8495B 8495D
0 to 110 dB 8496A 8496B
0 to 120 dB 355D
0 to 11 dB 8494G 8494H 84904K 84904L
0 to 12 dB 355E
0 to 70 dB 8495G 8495H 8495K
84907K 84907L
0 to 90 dB 8497K
84906K 84906L
0 to 110 dB 8496G 8496H
0 to 120 dB 355F
Manual
Programmable
10 dB
1 dB
1 dB
10 dB
Manual
Programmable
45
Programmable and Manual Step
HP 84904L
HP 84904/906/907 Series
This family of programmable step attenuators offers
unmatched attenuation performance to 40 GHz. The
K models brings superior accuracy and reliability to
26.5 GHz, and the L models offers unparalleled
performance to 40 GHz.
HP step attenuators consist of 3 or 4 cascaded
sections of specific attenuation values, e.g., 1, 2, 4,
or 10, 20, 30 or 40 dB. Both families offer the
selection, performance, accuracy and reliability
expected from HP: attenuation ranges of 11, 70,
or 90 dB, 1 dB, and 10 dB step sizes, 5 million cycles
per section and better than 0.03 dB repeatability.
RF connector choices include precision 3.5 mm on
the 26.5 GHz K models, and precision 2.4 mm or 2.92
mm on the L models. While the 2.92-mm connector
format is compatible with both 3.5-mm and SMA
connectors, Hewlett-Packard recommends the more
rugged 2.4-mm connectors.
HP programmable step attenuators feature electromechanical designs that achieve 20 milliseconds
switching time, including settling time. The permanent magnet latching allows automatic interruption
of the dc drive voltage to cut power consumption and
simplify circuit design. They are equipped with
10-pin DIP sockets (m) and have optional interconnect
cables available.
HP 8494/95/96A,B,D
HP 8494/95/96G,H,K
6
Attenuators
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HP 8494/95/96/97 Series
This family of manual step attenuators offers fast, precise
signal level control in three frequency ranges, dc to
4 GHz, dc to 18 GHz and dc to 26.5 GHz. They feature
exceptional repeatability and reliability in a wide range of
frequency, attenuation and connector options.
Attenuation repeatability is specified to be less than
0.03 dB (0.05 dB, 18 to 26.5 GHz) for 5 million cycles
per section. This assures low measurement uncertainty when designed into automatic test systems. Electromechanical step attenuators offer low SWR, low insertion
loss and high accuracy required by high-performance test
and measurement equipment.
Precision plated leaf-spring contacts insert/remove
attenuator sections (miniature tantalum nitride
thin-film T-pads on sapphire and alumina substrates)
from the signal path. Unique process controls and material
selection ensure unmatched life and contact repeatability.
Programmable Models
Miniature drive solenoids in the programmable models
keep switching time, including settling, down to less
than 20 milliseconds. Once switched, strong permanent
magnets hold the solenoids (and attenuation value) in
place. Current interrupts automatically disconnect solenoid
current, simplifying driver circuit design and minimizing
heat dissipation. Programming is done through a 12-pin
Viking socket or optional ribbon cables with DIP plugs.
Automatic drive control is easy using the HP-IB compatible HP 11713A or 87130A attenuator/switch driver and
an external controller.
Programmable and Manual Step
Programmable Driver Instruments
Programmable drive options for step attenuators
include the HP 11713A attenuator/switch driver, which
permits users to easily integrate the attenuator into HP-IB
compatible automatic test systems. Also, see page 110
for product descriptions of the HP 87130A and
70611A (MMS) attenuator/switch drivers.
Interconnect cable selections include various connector
and ribbon cable configurations to match user applications. Standard interconnect cables are described in the
Attenuator Cables table on page 47.
Manual Models
These models provide excellent performance with the
simplicity and convenience of positive manual switching.
A low torque camshaft activates the insertion and
removal of the attenuation sections. Positive detents
and an attenuation level indicator ensures quick and
accurate control.
Attenuator Interconnecting Kits
To achieve 1 dB step resolution up to 81 dB, 101 dB or
121 dB, combine the HP 8494 with 8495/96/97 using the
HP 11716A,B,C interconnect kits to cascade attenuators
in series. The HP 11717A attenuator/switch rack mount
support kit allows easy rack mounting (See page 47).
46
47
Programmable and Manual Step
HP Model Frequency Attenuation Insertion Maximum Repeatability1Maximum RF Shipping
(Switching Mode) Range (GHz) Range Loss @ 0 dB SWR Life Input Power Weight
355C dc to 1 0 to 12 dB
(Manual) 1 dB steps
355E dc to 1 0 to 12 dB
(Programmable) 1 dB steps
355D dc to 1 0 to 120 dB
(Manual) 10 dB steps
355F dc to 1 0 to 120 dB
(Programmable) 10 dB steps
8494A dc to 4 0 to 11 dB
(Manual) 1 dB steps
1.5
8494G dc to 4 0 to 11 dB
(Programmable) 1 dB steps
8494B dc to 18 0 to 11 dB 1.5 to 8 GHz
(Manual) 1 dB steps 1.6 to 12.4 GHz
8494H dc to 18 0 to 11 dB 1.9 to 18 GHz
(Programmable) 1 dB steps
8495A dc to 4 0 to 70 dB
(Manual) 10 dB steps
1.35
8495G dc to 4 0 to 70 dB
(Programmable) 10 dB steps
8495B dc to 18 0 to 70 dB 1.35 to 8 GHz
(Manual) 10 dB steps 1.5 to 12.4 GHz
8495H dc to 18 0 to 70 dB 1.7 to 18 GHz
(Programmable) 10 dB steps
8495D dc to 26.5 0 to 70 dB 1.6 to 6 GHz 0.03 dB max
(Manual) 10 dB steps 1.6 to 12.4 GHz t o 18 GHz
8495K dc to 26.5 0 to 70 dB 0.5 dB + 1.9 to 18 GHz 0.05 dB max
(Programmable) 10 dB steps 0.13 dB/GHz 2.2 to 26.5 GHz to 26.5 GHz
5 million cycles
per section
8496A dc to 4 0 to 110 dB
(Manual) 10 dB steps
1.5
8496G dc to 4 0 to 110 dB
(Programmable) 10 dB steps
8496B dc to 18 0 to 110 dB 1.5 to 8 GHz
(Manual) 10 dB steps 1.6 to 12.4 GHz
8496H dc to 18 0 to 110 dB 1.9 to 18 GHz
(Programmable) 10 dB steps
8497K dc to 26.5 0 to 90 dB 0.4 dB + 1.25 to 6 GHz 0.03 dB max
(Programmable) 10 dB steps 0.09 dB/GHz 1.45 to 12.4 GHz to 18 GHz
1.6 to 18 GHz 0.05 dB max
1.8 to 26.5 GHz to 26.5 GHz
5 million cycles
per section
Specifications
1
Measured at 25 °C. 2Not to exceed average power.
0.2 dB +
2.3 dB/GHz
0.03 dB max
0.5 million cycles
per section
0.5 W avg.
350 W peak
2
(10 µs max.)
1 W avg.
100 W peak
2
(10 µs max.)
1.4 kg (3 lb)
0.9 kg (2 lb)
1.2 to 250 MHz
1.3 to 500 MHz
1.5 to 1 GHz
0.03 dB max
5 million cycles
per section
0.6 dB +
0.09 dB/GHz
0.4 dB +
0.07 dB/GHz
0.03 dB max
5 million cycles
per section
0.6 dB +
0.09 dB/GHz
Indicates QuickShip availability
. Available on HP 355 C,E standard models only. Available on HP 849X A,B,G,H models with Option 001 only.
Available on HP 849X D,K models with Option 004 only. Contact HP Direct or your local HP sales representative to confirm QuickShip.
6
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Programmable and Manual Step
48
Std. Opt. 001 Opt. 005
RF Connectors BNC (f) N (f) TNC (f)
Drive Circuit Protection Opt. 007: Protection diodes for HP 355E,F
Std. Opt. 011 Opt. 015
Supply Voltage
Supply Voltage Range 20 to 30 Vdc 4.5 to 7 Vdc 13 to 22 Vdc
Supply Voltage (nom) 24 Vdc 5 Vdc 15 Vdc
Current Drawn 125 ma 300 ma 187 ma
RF Connectors
A,B,G,H models Opt. 001: N (f) Opt. 002: SMA (f) Opt. 003: APC-7
K models Opt. 004: 3.5 mm (f)
DC Connectors
G,H,K models Std: 12-pin Viking connector
Opt. 008: 8-inch ribbon cable with 14-pin DIP plug
Opt. 016: 16-inch ribbon cable with 14-pin DIP plug
Calibration Documentation See ordering information
HP 355 Series Options
HP 8494/95/96/97 Series Options
49
Programmable and Manual Step
HP Model Frequency Attenuation Insertion Maximum SWR Repeatability1Maximum RF Shipping
(Switching Mode) Range (GHz) Range Loss (dB) Std. (Opt. 006) Life Input Power Weight
84904K dc to 26.5 1.3 (1.5) to 12.4 GHz
(Programmable) 0 to 11 dB 0.8 dB + 1.7 (1.9) to 34 GHz 0.29 kg
84904L dc to 40 1 dB steps 0.04 dB/GHz 1.8 (2.0) to 40 GHz (10.32 oz)
(Programmable)
84906K dc to 26.5 1.3 (1.5) to 12.4 GHz
(Programmable) 0 to 90 dB 0.8 dB + 1.7 (1.9) to 34 GHz 0.29 kg
84906L dc to 40 10 dB steps 0.04 dB/GHz 1.8 (2.0) to 40 GHz (10.32 oz)
(Programmable)
84907K dc to 26.5 1.25 (1.4) to 12.4 GHz
(Programmable) 0 to 70 dB 0.6 dB + 1.5 (1.7) to 34 GHz 0.23 kg
84907L dc to 40 10 dB steps 0.03 dB/GHz 1.7 (1.9) to 40 GHz (8.1 oz)
(Programmable)
Specifications
1
Measured at 25 °C.
2
Not to exceed average power.
Std. Opt. 011 Opt. 015
Supply Voltage
Supply Voltage Range 20 to 30 Vdc 4.5 to 7 Vdc 13 to 22 Vdc
Supply Voltage (nom) 24 Vdc 5 Vdc 15 Vdc
RF Connectors
K models Std.: 3.5 mm (f) Opt. 104: 3.5 mm (f)
3
3.5 mm (m)
4
L models Std.: 2.4 mm (f) Opt. 006: 2.92 mm (f) Opt. 100: 2.4 mm (f)
3
Opt. 106: 2.92 mm (f)
3
2.4 mm (m)
4
2.92 mm (m)
4
Calibration Documentation See ordering information
HP 84904/906/907 Series Options
3
Drive cable end.
4
End opposite to drive cable.
1 W avg.
100 W peak
2
(10 µs max)
0.03 dB max.
5 million
cycles
per section
HP Model Number OEM Model Number HP Model Number OEM Model Number
8494A 33320A 8496H 33322H
8494B 33320B 8497K 33323K
8494G 33320G 84904K 33324K
8494H 33320H 84904L 33324L
8495G 33321G 84906K 33326K
8495H 33321H 84906L 33326L
8495K 33321K 84907K 33327K
8496G 33322G 84907L 33327L
Some HP attenuators are available as OEM equivalents to standard models.
This table shows the corresponding model numbers.
OEM models of step attenuators are furnished without a base.
6
Attenuators
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HP 8494/95/96/97 Series – Manual
Programmable and Manual Step
41.8
(1.65)
10.4
(0.41)
Mounting Holes (4)
M3 X 0.5 X 6 Deep
2.6 dia. Thru
5.8
(0.23)
13.3
(0.52)
94
(3.7)
73.3
(2.89)
104.3
(4.11)
41.5
(1.63)
2.4 mm (f) Connectors Std. (L-models)
3.5 mm (f) Connectors Std. (K-models)
See ordering example for connector options
6.6
(0.26)
6.6
(0.26)
10.4
(0.41)
Mounting Holes (4)
M3 X 0.5 X 6 Deep
2.6 Thru
5.8
(0.23)
13.3
(0.52)
74.5
(2.9)
53.8
(2.1)
84.8
(3.3)
41.5
(1.63)
2.4 mm (f) Connectors Std. (L-models)
41.8
(1.65)
19.3
(0.76)
21.7
(0.85)
7.4
(0.30)
22.2
(0.87)
11.1
(0.44)
3.5 mm (f) Connectors Std. (K-models)
101.60 (4.00)
1
129.03 (5.08)
2
7.9
(0.31)
12.2
(0.5)
SMA Jack (2)
22.1
(0.87)
19.0
(0.75)
9.5
(0.38)
83.30 (3.28)
1
111.00 (4.37)
2
76.2 (3.000)
1
103.7 (4.084)
2
9.15 (0.36)
12. 5
(0.49)
4-40 UNC x 5.11 mm (.20) Deep
Mounting Holes (2), this side only
83.30 (3.28)
1
111.00 (4.37)
2
19.0
(0.75)
9.15 (0.36)
9.5
(0.38)
1
HP 8495A,B.
2
HP 8494A,B,
8495D, 8496A,B.
Note: Base can be removed
by user to access mounting
holes as shown.
11.4
(0.45)
38.1
(1.50)
56.1
(2.21)
22.9
19.0
(0.90)
(0.730)
7.4
(0.29)
Outline Drawings
HP 84904/906/907 Series – Programmable
Dimensions are in mm (inches) nominal, unless otherwise specified.
50
Programmable and Manual Step
51
HP 8494/95/96/97 Series – Programmable
Dimensions are in mm (inches) nominal, unless otherwise specified.
6
Attenuators
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PRESS
Solenoid Drive Plug Detail
To Remove: Press at arrows with thumb and finger;
pull to detach.
Caution: Do not twist.
1
HP 8495G,H.
2
HP 8494G,H, 8495K, 8496G,H, 8497K.
101.6 (4.00)
1
129.0 (5.08)
2
83.3 (3.28)
1
111 (4.37)
2
8.9
Note: Base can be removed by user to
access mounting holes as shown above.
(0.35)
4-40 UNC x 5.1 mm (0.20)
Deep Mounting
Holes (2) both sides
19.1
(0.75)
10. 4
(0.41)
76.2 (3.00)
1
103.7 (4.08)
2
104.9 (4.13)
1
132.7 (5.21)
2
15.7
(0.62)
Solenoid Drive Plug and 5 ft. cable
supplied, 6.3 (0.25) dia.
41.3
(1.63)
14
8
1
7
Plug Bottom View
14 Pin
IC Plug Type
Opt. 016:
406 (16)
Opt. 008:
203 (8)
11.4
(0.45)
44.5
(1.80)
22.9
(0.90)
7.4
(0.29)
11.4
(0.45)
44.4
(1.75)
56.1
(2.21)
22.9
19.0
(0.90)
(0.730)
7.4
(0.29)
Programmable and Manual Step
HP 8494/95/96/97 Series Ordering Example
HP 84 9 Option Option Option Option
4: 11 dB max, 1 dB steps A: Manual, dc to 4 GHz A,B,G,H models: Std.: 24 Vdc G, H, K models UK6: Commercial calibration
5: 70 dB max, 10 dB steps B: Manual, dc to 18 GHz 001: N (f) 011: 5 Vdc Std.: 12-pin Viking test data with certificate
6: 110 dB max, 10 dB steps D: Manual, dc to 26.5 GHz
2
002: SMA (f) connector
7: 90 dB max, 10 dB steps G: Programmable, dc to 4 GHz 003: APC-7 008: 8-inch ribbon
UKS: Commercial calibration
H: Programmable, dc to 18 GHz3D,K models: cable with
certificate
K: Programmable, dc to 26.5 GHz 004: 3.5 mm (f)
3
14-pin DIP plug
016: 16-inch ribbon
cable with
14-pin DIP plug
4
A
001
011
008
UK6
HP 84904/906/907 Series Ordering Example
4
HP 8490 Option Option Option
4: 11 dB max, 1 dB steps K: dc to 26.5 GHz
Std.: 24 Vdc
K models UK6: Commercial calibration
6: 90 dB max, 10 dB steps L: dc to 40 GHz 011: 5 Vdc 104: 3.5 mm (f) drive cable end test data with certificate
7: 70 dB max, 10 dB steps 015: 15 Vdc 3.5 mm (m) opposite end
UKS: Commercial calibration
L models
certificate
006: 2.92 mm (f) both ends
100: 2.4 mm (f) drive cable end, 2.4 mm (m) opposite end
106: 2.92 mm (f) drive cable end, 2.92 mm (m) opposite end
4
K
011
UK6
006
1
Each order must include RF connector option.
2
Available with HP 8495 only.
3
Available with HP 8495/97 only.
4
Drive cable not included. See Attenuator Cables table on next page.
5
Option UK6/UKS not available with Option 106.
HP 35 5 Option Option
C: Manual, 0 to 12 dB, 1 dB steps Std: BNC (f) 007: Protection diodes
D: Manual, 0 to 120 dB, 10 dB steps 001: N (f) for HP 355E,F
E: Programmable, 0 to 12 dB, 1 dB steps 005: TNC (f) (see page 38)
F: Programmable, 0 to 120 dB, 10 dB steps
Step Attenuator Ordering Information
HP 355 Series Ordering Example
D
001
007
Type/Attenuation Range
Attenuation Range
Attenuation Range
Type/Frequency Range
Frequency Range
RF Connector
1
Supply Voltage
Supply Voltage
DC Connector
RF Connector
Calibration Documentation
5
Calibration Documentation
5
Drive Circuit Protection
RF Connector
52
53
Programmable and Manual Step
Attenuator/Switch Driver
Attenuator Accessories
HP Model HP Part
Number Number Where Used Description
11764A 11713A to 84904/906/907 10-pin DIP to Viking conn., 60 inches
11764B 84904/906/907 to ribbon 10-pin DIP to 60 inch ribbon cable, bare leads
11764C 84904/906/907 to DIP 10-pin DIP to 14-pin DIP, 8-inch ribbon cable
11764D 84904/906/907 to DIP 10-pin DIP to 14-pin DIP, 16-inch ribbon cable
11764-60005 84941A dist bd to 8494/95/96/97 Viking to (4) 4-pin Berg conn., 30 inches
11764-60006 84941A dist bd to 84904/906/907 10-pin DIP to (4) 4-pin Berg conn., 30 inches
70612-60017 84941A dist bd to 8494/95/96/97 Viking to (4) 4-pin Berg conn., 20 inches
70612-60018 84941A dist bd to 84904/906/907 10-pin DIP to (4) 4-pin Berg conn., 20 inches
Attenuator Cables
For complete cable configuration information, request publication number 5963-2038E,
HP 70611A, HP 87130A and
HP 11713A Switch Attenuator Driver Configuration Guide
.
Attenuator Accessories
HP 11716 Series Attenuator Interconnect Kits
These kits can be utilized to connect any two of
the HP 8494/95/96 attenuators in series. The rigid
interconnect cable is available in type-N, APC-7,
and SMA connectors as described below.
HP 11716A Attenuator Interconnect Kit (type-N)
HP 11716B Attenuator Interconnect Kit (APC-7)
HP 11716C Attenuator Interconnect Kit (SMA)
HP 11717A Attenuator/Switch Rack Mount
Support Kit
This kit provides the necessary hardware to mount
programmable attenuators and switches inside a test
system rack mount cabinet.
HP 11713A
HP 11716A
6
Attenuators
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HP 11713A Attenuator/Switch Driver
This driver provides HP-IB or “local” front panel drive
control for programmable attenuators and electromechanical switches. Concurrently drive up to two
HP 8494/95/96 and HP 87904/906/907 programmable
attenuators and two electromechanical switches
(HP 8761, 8762 or 8765 series). The HP 11713A can
also be used to supply +24V common and ten pairs of
current sinking contacts (total current draw <1.25A
peak for 1 sec., 0.65A steady state) to independently
control up to 10 relays. An integral power supply (with
short circuit protection) eliminates the need for an
external power source. Each HP 11713A is supplied
with two plug-in drive cables to simplify connection
to programmable attenuators. Switching time is less
than 10 milliseconds.
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