Agilent Technologies 8495D/K Attenuators Operating and Service Manual Agilent Part Number: 08495-90027 Printed in USA Print Date: July 2004 Supersedes: July 2002
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What You’ll Find in This Manual… • • • • • • • “Instrument Definition” on page 1 “Description” on page 2 “Specifications” on page 6 “Installation” on page 8 “Operating Instructions” on page 9 “Operator’s Check” on page 10 “Replaceable Parts” on page 12 8495D/K Attenuators Operating And Service Manual iii
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.
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Safety and Regulatory Information Review this product and related documentation to familiarize yourself with safety markings and instructions before you operate the instrument. This product has been designed and tested in accordance with international standards. WARNING The WARNING notice denotes a hazard. It calls attention to a procedure, practice, or the like, that, if not correctly performed or adhered to, could result in personal injury.
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viii 8495D/K Attenuators Operating And Service Manual
Instrument Definition This manual contains installation, operation, and test information for the 8495D and 8495K. Instruments Covered by Manual The instruments covered by this manual have a two-part serial number. The first four digits and letter comprise the serial number prefix. The last five digits form the sequential suffix that is unique to each instrument.
Description Description The Agilent 8495D and 8495K are 50-ohm, dc to 26.5 GHz, 0-70 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.
Description In the 8495K, each solenoid requires a drive of 20 to 30 V. The switching current is approximately 125 mA at 24 Vdc per section for the 8495K. 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 on page 2 and Figure 3 on page 5).
Description Table 2 Section Section 1 Solenoid Cable Connectors Section 2 Section 3 Section 4 Power Solenoid Coil Thru-Line Atten Card Thru-Line Atten Card Thru-Line Atten Card Thru-Line Atten Card V+ Cable Wire Color Code1 VIO YEL BLK GRN ORG BLU BRN WHT RED Connector Plug Pin Number 2 5 6 7 8 9 10 11 12 1 8495K 0 dB 10 dB 0 dB 20 dB 0 dB 20 dB 0 dB 20 dB – Option 016 13 2 11 5 3 9 4 10 6 Flat Pack Plug Pin Number3 1.
Description Table 3 Solenoid Cable Replaceable Parts Part Number Description 2220-0006 Screw, fillister Head 4-40x7/8 in. (for attaching base) 8120-2178 Cable, solenoid drive, 1.5 meters (5 feet) long, connector plug on one end and other end unterminated (8495K) 0370-1091 Knob (84950) 08496-20008 Base TKP12-100-P-TS-100-AU 1 Connector Plug and Contacts only without cable (8495K) 1. Available from Viking Industries, Inc., Chatsworth, California 91311.
Specifications Specifications Frequency Range and Attenuation Frequency Range dc to 26.5 GHz Attenuation 0 to 70 dB in 10 dB steps Attenuation Accuracy Attenuation Accuracy (± dB, referenced from 0 dB) Maximum Insertion Loss Attenuation Repeatability RF Power Handling Capability Solenoid Drive Switching speed 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.
Specifications Maximum SWR Instrument Frequency Range (GHz) Maximum SWR 8495D, 8495K dc to 6.0 6.0 to 12.4 12.4 to 18 18 to 26.5 1.25 1.45 1.9 2.2 Physical Characteristics Instrument Dimensions 1 (depth x width x height) Weight 8495D 6.25 in x 2.0625 in x 1.6875 in 159 mm x 52 mm x 43 mm 15 oz 5.625 in x 2.0625 in x 1.6875 in 159 mm x 52 mm x 43 mm 16 oz 8495K 425 g 454g 1. Dimensions are in millimeters and inches. Dimensions are for general information only.
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 10 (also see “Performance Tests” on page 11).
Operating Instructions Operating Instructions CAUTION Do not apply 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.
Operator’s Check 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.
Operator’s Check Table 4 Attenuator and SWR Settings SWR Meter Range (dB) Attenuation 2 0 6 10 1.20 1.80 12 20 0.15 0.85 16 30 1.05 1.95 221 40 –0.40 1.40 261 50 0.50 2.50 321 60 –0.60 1.60 361 70 0.35 2.65 8495D/K Meter Indication (dB) Minimum Actual Maximum Set to 0.5 1. Adjust range by 2 dB, if needed, to obtain a on-scale indication.
Replaceable Parts Replaceable Parts Table 5 lists the replaceable parts which are the only parts that can be replaced without access to the interior of the instrument. If any parts not listed below need replacement, return the instrument to Agilent Technologies. CAUTION Due to special fixtures necessary for assembly, do NOT attempt to replace any parts not listed in the table below. If the instrument is opened, the warranty is void.
