HP355C/D/E/F Manual
Contents
1. DRIVER CIRCUITS SEE FIGURE 2 e eu A A c4 A e e m o em 4 A am aX eX w PROCEDURE Connect equipment as shown above with Attenuator set to 0 dB attenuation Set Test Oscillator to 0 3 Vrms at 1 kHz Set the SWR Meter input to XTAL IMPED LOW and the range to 2 dB expanded for 355D or 355F or to 10 dB with 0 dB expand for 355C or 355E Adjust its bandwidth to the center of the adjustment range Fine tune oscillator frequency to obtain the maximum meter indication Set attenuator and SWR Meter range switch as listed in table next page and verify that the SWR Meter indicates within the limits shown Figure 4 Operator s Checks 1 of 2 Model 355C D E F Page 9 e OPERATOR S CHECKS Meter Indication dB SWR Meter Attenuation Set to 0 0 _ m SWR Meter Attenuation Meter Indication dB Neun um me Ama Me Set to 0 5 Adjust range by 2 dB if needed to obtain an on scale indication Figure 4 Operator s Checks 2 of 2 i i i i i f f Page 10 OPERATOR S CHECK The Operator s Check Figure 4 is supplied to allow the operator to make a quick check of the attenuator prior to use or if a failure is suspected PERFORMANCE TESTS The attenuator can be tested to the accuracy of the specifications in Table 1 with an Automatic Net work Analyzer or equivalent equipment of suitable accuracy If an Automatic Network Analyzer is available test2. incomplete if there is mechanical damage or defect or if the instrument does not pass the electrical performance test notify the nearest Hewlett Packard office If the shipping con tainer is damaged or the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard office Keep the shipping mate rials for the carrier s inspection Mating Connectors Mating RF input and output connectors used with the attenuators should be Standard Type BNC Option 001 Type N Option 005 Type TNC For the 355E and 355F the solenoid drive connec tor plug is 7 pin male HP 1251 1037 Operating Environment The operating environment of the instrument should be within the following limitations Temperature 0 to 55 C Page 3 Humidity lt 95 relative Altitude lt 4570 m 15 000 ft Storage and Shipment Environment The instrument should be stored in a clean dry environment The following environ mental limitations apply to both storage and ship ment Temperature 40 C to 75 C Humidity lt 95 relative Altitude lt 7620 m 25 000 ft Original Packaging Containers and materials identi cal to those used in factory packaging are available through Hewlett Packard offices If the instrument is being returned to Hewlett Packard for servicing attach a tag indicating the type of service required return address model number and full serial num ber Also mark the container FR
3. information contact the nearest Hewlett Packard Sales and Service Office in HP Catalog or contact the nearest regional office listed below UNITED STATES NO CALIFORNIA San Francisco Area 333 Logue Ave Mt View CA 94043 SO CALIFORNIA Los Angeles Area 5400 West Rosecrans Blvd Lawndale CA 90260 GEORGIA 450 Interstate N Parkway Atlanta GA 30348 ILLINOIS 5201 Tollview Dr Rolling Meadows IL 60008 NEW JERSEY W 120 Century Rd Paramus NJ 07652 AUSTRALIA Hewlett Packard Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 CANADA Hewlett Packard Canada Ltd 6877 Goreway Drive Mississauga Ontario Canada L4V 1M8 ITALY Hewlett Packard Italiana S p A Via G Di Vittorio 9 20063 Cernusco Sul Naviglio MI FRANCE Hewlett Packard France Quartier de Courtaboeuf Boite Postale No 6 F 91401 Orsay Cedex GERMAN FEDERAL REPUBLIC Hewlett Packard GnbH Vertriebszentrale Frankfurt Bernerstrasse 117 Postfach 560 140 D 6000 Frankfurt 56 NETHERLANDS Hewlett Packard Benelux N V Van Heuven Doedhartlaan 121 P O Box 667 NL Amstelveen 1134 UNITED KINGDOM Hewlett Packard Ltd King Street Lane GB Winnersh Wokingham Bers RG11 5AR AFRICA ASIA CENTRAL AND SOUTH AMERICA Hewlett Packard Intercontinental 3200 Hillview Avenue Palo Alto CA 94304 U HEWLETT PACKARD HP Part No 00355 90045 Microfiche Part No 00355 90046 Printed in U S A
4. values factory adjusted Asterisk denotes factory selected value Figure 1 Schematic Diagrams Models 355C and 355D Model 355C D E F MODELS 355E AND 355F MODEL 355E LEAF SWITCH OUTPUT 1 Microswitches shown in 0 dB position 2 Resistances in ohms 1 296 3 Capacitance values factory adjusted 4 Asterisk denotes factory selected value Figure 2 Schematic Diagrams Models 355E and 355F Page 5 Page 6 Model 355C D E F Table 2 Attenuator Options Models 355C and 355D Option 001 Type N input and output connectors Option 003 Modifies the 355C or 355D to provide panel mounting capability by incorp orating the following changes 1 The attenuator shaft is 3 16 longer thereby allowing the instrument shaft to protrude through a 3 16 panel 2 Four 6 32 holes are drilled and tapped in the instrument casting to allow the instrument to be mounted to a panel 3 A 1 3 4 dial is added This dial is larger than that used with the standard Models 355C D NOTE Panel drilling detail for mounting Option 008 is as follows 0 500 0 250 ai E 0 375 DRILL No 22 DRILL Q G FOUR PLACES Option 005 Type TNC input and output connectors Models 355E and 355F Option 007 Adds transistor driver protection circuitry as follows CONNECTOR HP No 1251 1036 f MATING PLUG HP No 1251 1037 1251 1040 1251 1041 3 dB 2 dB 1dB 6 dB 30 dB 20 dB 1
5. 0 dB 60 ag SOLENOID HP No 0491 0048 4 REQ D Diode HP No 1901 0029 4 REQ D NOTE Pin H must be positive with respect to other pins Model 355C D E F F 60dB E 6dB SECTION Page 7 F 10dB F 20dB F 30 dB E 1dB E 2dB E 3dB SECTION SECTION SECTION To Toobtain attenuation settings given below apply 15 to 18 Vde between Pin H common and Pins attenuation settings given below Toobtain attenuation settings given below apply 15 to 18 Vde between Pin H common and Pins 15to 18 Vdc between Pin H common and Pins 355F ARH soe aser Pms Figure 3 355E and 355F Solenoid and Connector Wiring and Programming Page 8 Model 355C D E F OPERATOR S CHECK wr 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 that is the SWR meter The attenuator and detector range switches are stepped together and the variations in level noted This verifies that each attenuator section is being properly switched and checks the low frequency accuracy of the attenuator NOTE The SWR Meter used in this check is calibrated for a square law detector and therefore the range changes and errors read in dB are twice that indicated by the meter HP 6518 HP 415E TEST OSCILLATOR SWR METER 355C OR 355D MANUAL ATTENUATOR t 355E OR 355F PROGRAMMABLE ATTENUATOR SOLENOID
6. AGILE to assure careful handling In any correspondence refer to the instrument by model number and full serial number OPERATING INSTRUCTIONS CAUTION Do not apply RF power greater than 0 5W average or 2450W peak with a max imum pulse width of 200 us If these limits are exceeded the Attenuator may be damaged Either RF connector may be used as the input or output connector except in the case of the 355D F driven from a low impedance source This is because the leaf switch Figures 1 and 2 may be closed be fore the microswitch opens when the dial is switched from 50 dB to 60 dB Should this occur a momen tary short is placed across the connector inviting damage to either the microswitch or the signal source Therefore if the signal source is subject to damage by a short use the rear most connector for the input The dial or solenoid connector is at the front of the attenuator This pads the momentary short with 50 dB of isolation For the 355E and 355F wire the solenoid drive plug supplied using Figure 3 as a wiring guide An un energized attenu ator solenoid section is 0 dB Apply 15 to 18 Vdc with respect to pin H to energize an attenuator solenoid A programming table is also given in Figure 3 Page 4 Model 355C D E F MODELS 355C AND 355D MODEL 355C OUTPUT OR MODEL 355D SEN OUTPUT LEAF SWITCH Microswitches shown in 0 dB position Resistances in ohms 1 290 Capacitance
7. OPERATING AND SERVICE MANUAL 355C 355D 355E 355F VHF ATTENUATOR U HEWLETT Printed AUGUST 1980 Jj PACKARD WL AGGE dH 388 dH 68 dH 388 dH Page 2 GENERAL INFORMATION This manual contains operating instructions for Hewlett Packard Model 355C 355D 355E and 355F VHF Attenuators Included in the manual is the in formation required to install and test these attenua tors On the rear cover of this manual below the manual part number is a Microfiche part number This number may be used to order a 100 x 150 mm 4 x 6 in microfilm transparency of the manual The microfiche package also includes the latest Manual Changes supplement as well as all pertinent Service Notes Specifications Instrument specifications are listed in Table 1 These specifications are the performance standards or limits against which the instruments may be tested Description The Hewlett Packard Model 355C 355D 355E and 355F Attenuators are 50 ohm coaxial step atten uators usable from dc to 1 GHz Models 355C and 355E provide 0 to 12 dB of attenuation in 1 dB steps Model 355C D E F Models 355D and 355F provide 0 to 120 dB of at tenuation in 10 dB steps The 355C and 355D are manual attenuators The 355E and 355F are pro grammable The schematic for the Model 355C D is shown in Figure 1 and that of the Model 355E F in Figure 2 The attenuator sections consist of resistor pi net works which are switch
8. ed in or bypassed by micro switches In the 355C and 355D the microswitches are actuated by cams see Figure 1 In the 355E and 355F the microswitches are actuated by sole noids see Figure 2 The standard RF connectors are BNC type In the 355E and 355F power must be continuously applied to the solenoid to actuate the microswitch i e to insert an attenuator section Each solenoid draws approximately 0 1A at 15 Vdc Warranty Attenuators are warranted only when they are oper ated within their specifications especially power handling capability Any attenuators returned to Hewlett Packard under warranty will be examined carefully to determine if the failure was due to im proper use Be sure to observe the following caution Tahle 1 Specifications MODELS 355 and 355E Attenuation Range 0 to 12 dB Attenuation Steps 1 dB Overall Accuracy 0 1 dB at 1000 Hz 0 25 dB dc to 500 MHz 0 35 dB dc to 1000 MHz MODELS 355D and 355F Attenuation Range 0 to 120 dB Attenuation Steps 10 dB Overall Accuracy at 1000 Hz 0 to 120 dB 0 3 dB Below 1000 MHz 0 to 90 dB 1 5 dB 90 to 120 dB 3 dB MODELS 355E and 355F Switching Speed 65 ms Required Solenoid Power 15 to 18 Vdc 1 8 A MODELS 355C E and 355D F Frequency Range dc to 1000 MHz Impedance 50 ohms nominal 1 Maximum SWR input and output 1 2 below 250 MHz 1 3 below 500 MHz 1 5 below 1000 MHz Maximum Residual Attenuation L
9. ess than 0 25 dB to 100 MHz Less than 0 75 dB to 500 MHz Less than 1 5 dB to 1000 MHz Maximum Power Dissipation 0 5W average Maximum Pulse Voltage 350 Vpk Connectors BNC female Dimensions 355C and 355D Length 152 mm 6 in Width 71 mm 2 13 16 in Height 68 mm 2 11 16 in Weight 0 67 kg 1 5 Ib 355E and 355F 139 mm 5 7 16 in 71 mm 2 13 16 in 71 mm 2 11 16 in Dimensions are for general information only If dimensions are required for building special enclosures contact your HP office Model 355C D E F Do not exceed the RF power rating of 0 5W average or 2450W peak with a maximum pulse width of 200 us Do not connect an attenuator RF input or output connector to greater than 5 Vdc If the attenuator must be connected to a device with a potential greater than 5 Vdc use a blocking capacitor Accessories Supplied The 355E and 355F programmable attenuators are supplied with a 7 pin male connector HP 1251 1037 for the solenoid drive input Options Table 2 lists the options available INSTALLATION initial Inspection Inspect the shipping container for damage If the shipping container or cushioning material is dam aged it should be kept until the contents of the shipment have been checked mechanically and elec trically A procedure for checking electrical per formance is given under Operator s Check see PERFORMANCE TESTS If the contents of the shipment are
10. ng the Opera tor s Check shown in Figure 4 If the instrument does not perform within limits return the instru ment to Hewlett Packard CAUTION Due to special fixtures necessary for as sembly do NOT attempt to replace any parts not listed in Table 3 If the instru ment is opened the warranty is void Table 3 Replaceable Parts 355C Glide feet 4 each HP 0403 0026 Dial Assembly HP355A 40G Dial Assembly Option 003 HP 00355 00001 355D Glide feet 4 each HP 0403 0026 Dial Assembly HP 355A 40H Dial Assembly Option 003 HP 00355 00002 355E and 355F HP 0403 0026 HP 1251 1037 Glide feet 4 each Connector 7 pin male CERTIFICATION Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be retu
11. rned to a service facility designated by HP Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HP SHALLNOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products HEWLETT PACKARD SERVICE OFFICES To obtain servicing
12. the attenuator using the procedures in the analyzer s operating manual The 355E and 355F attenuators must be programmed by a suit able circuit to provide the various values of atten uation see Figure 3 ADJUSTMENTS The attenuators have no internal adjustments and should not be opened If defective return the atten uator to the nearest Hewlett Packard office for repair The solenoids in the 355E and 355F have been precisely adjusted at the factory No attempt should be made to replace them except by factory approved service repre sentatives The operation of the attenua tors will be unreliable if plungers are not kept with their proper solenoids Do not interchange or swap them REPLACEABLE PARTS Table 3 lists the replaceable parts which are the only parts that can be replaced without access to the in terior of the attenuator Model 355C D E F If any parts not listed in Table 3 need replacement return the instrument to Hewlett Packard To order a part listed in the replaceable parts table quote the Hewlett Packard part number with check digit CD indicate the quantity required and ad dress the order to the nearest Hewlett Packard office NOTE Within the USA it is better to order direct ly from the HP Parts Center in Mt View California Ask your nearest HP office for information and forms for the Direct Mail Order System SERVICE Troubleshooting Troubleshooting consists of performi
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