Agilent 8495D/K Attenuators Operating and Service Manual Agilent Technologies
Notices © Agilent Technologies, Inc. 2011 Warranty No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws. The material contained in this document is provided “as is,” and is subject to being changed, without notice, in future editions.
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.
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).
Contacting Agilent For more information, please contact your nearest Agilent office.
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Contents 1 Introduction 9 Product Overview 10 Supplied Accessories 12 Specifications 15 Frequency Range and Attenuation 15 Attenuation Accuracy 15 Maximum Insertion Loss 15 Attenuation Repeatability 16 RF Power Handling Capability 16 Solenoid Drive 16 Switching Speed 16 Maximum SWR 17 Operating Life 17 2 Environmental Specifications & Physical Dimensions Environmental Specifications Physical Dimensions 3 Operating Guides 19 20 21 25 Installation 26 Initial Inspection 26 Mating Connectors 27 Inst
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Agilent 8495D/K Attenuators Operating and Service Manual 1 Introduction Product Overview 10 Supplied Accessories 12 Specifications 15 Frequency Range and Attenuation 15 Attenuation Accuracy 15 Maximum Insertion Loss 15 Attenuation Repeatability 16 RF Power Handling Capability 16 Solenoid Drive 16 Switching Speed 16 Maximum SWR 17 Operating Life 17 This manual contains operating instructions for the Agilent 8495D/K Attenuators.
1 Introduction Product Overview The Agilent 8495D and 8495K are 50- ohm, dc to 26.5 GHz, 0 dB to 70 dB (in 10 dB steps), coaxial attenuators with APC 3.5 connectors. Each attenuator is made up of four attenuation sections 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.
Introduction 1 From solenoid driver circuits +24 Vdc Thru line Wire color code Thru line Thru line Thru line RF output RF input Attenuator card 10 dB Figure 1 Attenuator card 20 dB Attenuator card 20 dB Attenuator card 20 dB 8495K Programmable Four-Section Attenuator Schematic Diagram In the 8495K, each solenoid requires a drive of 20 V to 30 V. The switching current is approximately 125 mA at 24 Vdc per section for the 8495K.
1 Introduction Table 1 Attenuator Switching Attenuator Sections Attenuation (dB) 1 10 dB 10 × 2 20 dB 20 30 × 40 50 × 60 70 × 3 20 dB 4 20 dB ×[1] ×[2] ×[1] ×[2] × × × × × × × × × × [1] D model only [2] K model only 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.
Introduction 1 Solenoid Cable Connectors Refer also to Figure 2 on page 13.
1 Introduction Solenoid cable connector jack Solenoid driver Any 75451 dual peripheral AND driver.
Introduction 1 Specifications Frequency Range and Attenuation Table 3 Frequency Range and Attenuation Frequency Range dc to 26.5 GHz Attenuation 0 dB to 70 dB in 10 dB steps Attenuation Accuracy Table 4 Attenuation Accuracy Attenuation Accuracy (± dB, referenced from 0 dB) Attenuation Selection (dB) dc–6.0 GHz 6.0–12.4 GHz 12.4–18.0 GHz 18.0–26.5 GHz 10 0.3 0.4 0.5 0.7 20 0.5 0.5 0.6 0.8 30 0.6 0.7 0.8 1.0 40 0.7 0.9 1.1 1.5 50 0.8 1.0 1.2 1.6 60 1.0 1.3 1.4 1.
1 Introduction Attenuation Repeatability ±0.03 dB max to 18 GHz ±0.05 dB max to 26.5 GHz (5 million cycles per section) RF Power Handling Capability 1 W average, 100 W peak with maximum pulse width of 10 microseconds. Solenoid Drive For Agilent 8495K only. Table 5 Solenoid Drive Solenoid Drive Coil Voltage Switching Current 8495K 20 Vdc to 30 Vdc 125 mA at 24 V (approx.) Switching Speed Maximum 20 milliseconds including settling time.
Introduction 1 Maximum SWR Table 6 Maximum SWR Instrument Frequency Range (GHz) Maximum SWR 8495D, 8495K dc to 6.0 6.0 to 12.4 12.4 to 18.0 18.0 to 26.5 1.25 1.45 1.9 2.2 Operating Life 5 million cycles per section.
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Agilent 8495D/K Attenuators Operating and Service Manual 2 Environmental Specifications & Physical Dimensions Environmental Specifications 20 Physical Dimensions 21 This chapter contains the environmental tests on the Agilent 8495D/K Attenuators that fully comply with Agilent Technologies’ product operating environmental specifications. The physical dimensions are illustrated in the later section.
2 Environmental Specifications & Physical Dimensions Environmental Specifications The Agilent 8495D/K Attenuators are designed to fully comply with Agilent Technologies’ product operating environmental specifications as shown in Table 7.
Environmental Specifications & Physical Dimensions 2 Physical Dimensions Table 8 shows the physical dimensions of the Agilent 8495D/K Attenuators. Table 8 Physical Dimensions Instrument Dimensions[1] Weight 8495D Per Figure 4 15 oz 425 g 8495K Per Figure 5 16 oz 454 g [1] Dimensions are in millimeters and inches. Dimensions are for general information only. If dimensions are required for building special enclosures, contact your Agilent field engineer.
2 Environmental Specifications & Physical Dimensions Figure 4 22 Dimensions of Agilent 8495D Attenuator Agilent 8495D/K Attenuators Operating and Service Manual
Environmental Specifications & Physical Dimensions Figure 5 2 Dimensions of Agilent 8495K Attenuator Agilent 8495D/K Attenuators Operating and Service Manual 23
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Agilent 8495D/K Attenuators Operating and Service Manual 3 Operating Guides Installation 26 Initial Inspection 26 Mating Connectors 27 Installation Instructions 27 Operating Instructions 28 Operating Information 28 Operator’s Check 28 Performance Tests 31 Service Instructions 31 This chapter describes the installation of the Agilent 8495D/K Attenuators. The operating instruction quick- check procedure is included for verification test prior to usage.
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.
Operating Guides 3 Mating Connectors The APC 3.5 connector is a 3.5- mm air line connector that will mate with the SMA type connectors. The SWR performance of this hybrid connection is similar to a mated pair of SMA connectors when used within the frequency range of the SMA connector. Option The attenuators are configured with the APC 3.5 female connectors and are designated as Option 004. CAUTION When installing the instrument, make sure that the connectors do not support weight or bear torque.
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 For the 8495K, do not ground both solenoid drive pins of the programmable attenuator 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.
Operating Guides NOTE 3 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. Test oscillator SWR meter 8495D manual attenuator Adapter 50 Ω Input 8495K programmable attenuator Figure 6 Solenoid driver circuits Operator’s Check Setup Procedure 1 Connect equipment as shown in Figure 6 on page 29 with the attenuator set to 0 dB. 2 Set the test oscillator to 0.3 Vrms at 1 kHz.
3 Operating Guides Table 9 Attenuator and SWR Settings SWR Meter Range (dB) Attenuation Meter Indication (dB) 8495D/K Minimum Actual Maximum 2 0 – Set to 0.5 – 6 10 1.20 – 1.80 12 20 0.15 – 0.85 16 30 1.05 – 1.95 22[1] 40 –0.40 – 1.40 [1] 26 50 0.50 – 2.50 32[1] 60 –0.60 – 1.60 36[1] 70 0.35 – 2.65 [1] Adjust range by 2 dB, if needed, to obtain an on-scale indication.
Operating Guides 3 Performance Tests The Agilent 8495D/K 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 8495D/K Attenuators do not have internal adjustments and should not be opened.
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