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Agilent Technologies
8494/95/96G/H Attenuators
Operating and Service
Manual
Agilent Part Number: 08495-90025
Printed in USA
Print Date: August 2004
Supersedes: July 2002
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Notice The information contained in this document is subject to change without notice. Agilent Technologies makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. Agilent Technologies assumes
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What You’ll Find in This Manual… Overview, page 1 Specifications, page 6 Installation, page 10 Operating Instructions, page 12 Replaceable Parts, page 15 Service, page 16 8494/95/96G/H Operating And Service Manual iii
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Warranty Custom systems are warranted by contractual agreement between Agilent Technologies and the customer. Certification Agilent Technologies, Inc., 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 extent allowed by the Institute’s calibration facility,
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Service and Support Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products. Any adjustment, maintenance, or repair of this product must be performed by qualified personnel. Contact your customer engineer through your local Agilent Technologies Service Center. You can find a list of local service representatives on the Web at: http://www.agilent.com/find/assist Click on “Contact Us” and select your country. Safety and Regulator
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Instrument Markings When you see this symbol on your instrument, you should refer to the instrument’s instruction manual for important information. ! This symbol indicates hazardous voltages. The laser radiation symbol is marked on products that have a laser output. This symbol indicates that the instrument requires alternating current (ac) input. 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 CS
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Overview This manual contains operating instructions for the Agilent 8494G/H, 8495G/H, and 8496G/H attenuators. Included in the manual is information required to install and test these attenuators. Specification Instrument specifications are indicated in Specifications, page 6. These specifications are the performance standards or limits against which the instruments may be tested. Instruments Covered by The instruments covered by this manual have a two-part serial number. The Manual first
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Overview NOTE Solenoid (K4) and associated circuitry are not available in models 8495G and 8495H. Figure 1 Typical Four Section Attenuator Schematic Diagram Table 1 and Table 2 on page 3 and Table 3 on page 4 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 program
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Overview Table 1 8494G/H Attenuator Switching Order 8494G/H Attenuator Sections Atten 1 2 3 4 (dB) 1 dB 2 dB 4 dB 4 dB 0 1X 2X 3X X 4X 5X X 6XX 7 XXX 8XX 9X X X 10 XXX 11 XXXX Table 2 8495G/H Attenuator Switching Order 8495G/H Attenuator Sections Atten 1 2 3 (dB) 10 dB 20 dB 40 dB 0 10 X 20 X 30 X X 40 X 50 X X 60 X X 70 XXX 8494/95/96G/H Operating And Service Manual 3
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Overview Table 3 8496G/H Attenuator Switching Order 8496G/H Attenuator Sections Atten 1 2 3 4 (dB) 10 dB 20 dB 40 dB 40 dB 0 10 X 20 X 30 X X 40 X 50 X X 60 X X 70 XXX 80 X X 90 X X X 100 X X X 110 XXXX Each solenoid requires a drive of 20 to 30 V with a switching current of * approximately 125 mA at 24 V dc 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
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Overview Figure 2 Typical Solenoid Coil Driver Circuits CAUTION Do not exceed the RF power rating of 1 W average or 100 W peak with a maximum pulse width of 10 µ s. Do not connect an attenuator RF input or output connector to greater the ±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.
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Specifications Specifications 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 Attenuation Accuracy (±dB): (Referenced from 0 dB) 8494G/H 8495G/H 8494G 8494H 8495G 8495H 8496G 8496H 8496G/H Att
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Specifications Maximum SWR Instrument Frequency Range (GHz) Maximum SWR 8495G dc to 4 1.35 8495H dc to 8 1.35 8 to 12.4 1.5 12.4 to 18 1.7 8494G, dc to 4 1.5 8496G 8494H, dc to 8 1.5 8496H 8 to 12.4 1.6 12.4 to 18 1.9 Maximum Residual Attenuation Instrument Maximum Residual Attenuation 8494G, 0.6 dB + 0.09 dB/GHz 8494H 8495G, 0.4 dB + 0.07 dB/GHz 8495H 8496G, 0.6 d8 + 0.09 dB/GHz 8496H Attenuation Repeatability ±0.01 dB typical after 5 million cycles RF Power Handling 1 W average, 100 W peak wi
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Specifications Solenoid Cable Connector Refer also to Figure 3. Section Section 1 Section 2 Section 3 Section 4 Power Solenoid Coil Thru-Line Atten Thru-Line Atten Thru-Line Atten Thru-Line Atten V+ Card Card Card Card Cable Wire Color PUR YEL BLK GRN ORN BLU BRN WHT RED 1 Code Connector Plug 56 789 10 11 12 1 2 Pin Number 8494G/H 0dB 1dB 0dB 2dB 0dB 4dB 0dB 4dB – 8495G/H 0dB 10dB 0dB 20dB 0dB 40dB – – – 8496G/H 0dB 10dB 0dB 20dB 0dB 40dB 0dB 40dB – Option 016 13 2 11 539 4 10 6 Flat Pack 3 Pl
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Specifications Minimum Life >5 million cycles per section Switching speed Maximum 20 milliseconds including settling time. Environment Limits The instrument should be stored in a clean, dry environment. The following environmental limits apply to storage and shipment, and operation. Characteristic Storage and Shipping Value Operating Value Temperature –40 to +75 °C 0 to +55 °C Humidity < 95% relative < 95% relative Altitude < 7600 m (25000 ft) < 4600 m (15000 ft) Physical Characteristics 1 2 In
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Installation Installation Initial Inspection 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 mechanically and electrically. A procedure for checking electrical performance is given under “Operator’s Check” on page 12 (also see “Performance Tests” on page 14). If the contents of the shipment are incomplete, if the
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Installation Installation 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 Instructions 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 al
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Operating Instructions 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 inp
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Operating Instructions Procedure 1. Connect equipment as shown in Figure 4 on page 12 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 center of adjustment range. Fine tune oscillator frequency to obtain maximum meter indication. 4. Set attenuator and SWR meter range switch as listed in Table 4 and verify that SWR meter indicates within
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Operating Instructions Performance Tests The instrument can be tested to the accuracy of the “Specifications” on page 6, with an automatic network analyzer or equivalent equipment of suitable accuracy. If an automatic network analyzer is available, test the instrument using the procedures in the analyzer's operating manual. Refer to the Agilent 11713A Attenuator/Switch Driver Operating and Service Manual for programming instructions. Adjustments The attenuators have no internal adjustments
