Agilent 8494/95/96A/B 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 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 Operatin
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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.
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.
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.
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 84
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.
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.
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.
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.
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 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.
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.
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.
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.
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.
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.
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.
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