HP Wheelchair 11947A User's Manual
Contents
1. 10 HP 11947A Operation and Service Manual LIMITER 6kHz HIGH PASS FILTER EARST LIMITER SECOND LIMITER 3 dB ATTENUATOR 4 8 dB ATTENUATOR 2 1 dB ATTENUATOR 1H34 2S Figure 4 1 HP 11947A Transient Limiter Board Assembly Schematic Diagram v y OUTPUT 342 1 HP 11947A Operation and Service Manual 11 MP1 saki of Jo J2 Figure 4 2 HP 11947A Transient Limiter Components Locations _ 12 HP 11947A Operation and Service Manual 7 Aman Ur HEWLETT PACKARD HP Part No 11947 90006 Printed in USA a e cd satir nata a ve Customer Order Number Printed in USA For HP Internal Reference Only Manufacturing Part Number 11947 90006 LULU2. Eskdale Road Winnersh Triangle Kanagawa 229 Japan 2000 South Park Place Wokingham Berkshire RG11 5DZ 81 427 59 1311 Atlanta GA 30339 England 404 955 1500 44 734 696622 People s Republic i NG 0f China ma Hlinois PE o lt i China Hewlett Packard Ltd Hewlett Packard Co soe Ga ute 38 Bei San Huan X1 Road 5201 Tollview Drive ss Shuang Yu Shu Rolling Meadows IL 60008 Hai Dian District 708 255 9800 Beijing China 86 1 256 6888 New Jersey Hewlett Packard Co Singapore 120 W Century Road Hewlett Packard Singapore Paramus NJ 07653 Pte Ltd 201 599 5000 1150 Depot Road Singapore 0410 Texas 65 273 7388 Hewlett Packard Co 930 E Campbell Rd Taiwan Richardson TX 75081 Hewlett Packard Taiwan 214 231 6101 8th Floor H P Building 337 Fu Hsing North Road Taipei Taiwan 886 2 712 0404 co 4 HP 11947A Operation and Service Manual 2 Operation Description For reliable operation over its full frequency and power range the limiter must be used asa unidirectional device Incident power must be applied as shown on the label of the limiter The limiter protects the input mixer and attenuator of a spectrum analyzer subjected to transients from Line Impedance Stabilization Networks during conducted EMI measurements Although harmonic distortion is generated by the HP 11947A while it is limiting the limiter still will prevent transients from damaging the device it is protecting
3. effects its limiting by reflecting some of the input power oo gt Limiting is nonlinear and depends on input power and ambient temperature The typical limiting curves shown in Figure 1 1 apply at an ambient temperature of 25 C Output Power mW si 1 10 100 tk 10k Input Power mW PHOTOG Figure 1 1 Typical Limiting Characteristics ch 24 HP 11847A Operation and Service Manual iaei 408 gk iis 9dB Specification Limit O O RO oe 100B 10 80 4108 mn Y S 12d8 5 Specification Limit T 1368 wo YI a T 14dB 15dB 007 50 100 200 300 400 MS Frequency MHz Figure 1 2 Typical Insertion Loss Versus Frequency Initial Inspection Inspect the shipping container for damage If the container or cushioning material is damaged it should be kept until the contents of the shipment have been checked for completeness and the HP 11947A has been checked mechanically and electrically Procedures for checking electrical performance are given in Chapter 3 Operation Verification If the contents are incomplete if there is mechanical damage or defect or if the instrument does not pass operation verification tests notify the nearest Hewlett Packard office listed in Table 1 2 If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the HP office Keep the shipping materials for inspection by the carrier The HP office will ar
4. 3456A and connect it to the same end of R6 The voltage should be less than 1 1 V ac if CR1 or CR2 are not open 13 Corinect the HP 3456A to the wire to J2 output connector Subtract the voltage at J2 from the reading in step 12 The difference should be less than 0 3 V ac if CR3 or CR4 are not shorted 14 Connect the HP 3325A and HP3456A to J2 The voltage at J2 should be less than 1 2 V ac or if CR3 or CR4 are not open 8 HP 11947A Operation and Service Manual seal 15 Connect the HP 3456A to the end of R6 closest to CR2 Subtract the voltage at R6 from the reading in step 14 The difference should be less than 0 4 V ac if CRI and CR2 are not shorted 16 If the conditions in steps 12 through 15 are met the limiting action is working a Nerd 4 Service A component locations diagram Figure 4 1 a schematic Figure 4 2 and a list of replaceable parts Table 4 1 are provided in this section It is recommended that defective HP 11947A Transient Limiters be returned to Hewlett Packard for repair so comprehensive testing can be performed Follow the procedures listed in Storage and shipment in Chapter 2 Disassembly The plastic housing halves can be carefully pried apart using a small flat blade screwdriver between the Type N connector and the housing The screws securing the shielding can are then visible and can be removed After removal of the can the HP 11947A Transient Limiter circuit board is accessible f
5. Caution Do not apply more than 2 5 W average power or 10 kW pulse power to the aa cae limiter Apply 2 12 Vdc Exceeding these levels could result in permanent damage to the limiter Mating Connectors Mating connectors used with the limiter should be Type N female at the output and BNC male at the input xo A E Caution Do not reverse the polarity of the limiter Doing so can destroy the limiter Operating Environment The HP 11947A should be operated only within the following temperature range 0 C to 55 C Storage and Shipment The HP 11947A may be stored or shipped in environments within the following temperature range 40 C to 78 C Containers and materials identical 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 the model number and full serial number of the instrument and your complete return address Also mark the container FRAGILE to assure careful handling In any correspondence refer to the instrument by model number and full serial number iso HP 11947A Operation and Service Manual 5 3 Operation Verification Insertion Loss and Frequency Response Description ae The following procedure will check insertion loss at the frequencies where calibration factors have been provided A comprehensive test makes a swept measurement usin
6. Operation and Service Manual HP 11947A Transient Limiter Kip HEWLETT PACKARD D o HP Part No 11947 80006 Printedin USA January 1991 Copyright Hewlett Packard Company 1991 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws 1212 Valley House Drive Rohnert Park CA 94928 4999 USA So Safety Symbols The following safety symbols are used throughout this manual Familiarize yourself with each of the symbols and its meaning before operating this instrument Caution The caution sign denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in damage to or gi destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met Warning The warning sign denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life 4 Do not proceed beyond a warning sign until the indicated conditions are fully understood and met General palay Con jacranons Warning Before this instrument is switched on make sure it has been properly grounded Na f through the protective conductor of the ac power cable to a socket outlet l provided with protective earth contact o Any interruption of the protective grounding dinidin
7. d HP 11947A Operation and Service Manual 14 15 16 17 18 19 20 21 22 Set the spectrum analyzer controls as follows TART FREQ 50 MEH STOP FREQ 210 MHz Set the HP 8340A controls as follows INSTR PRESET POWER LEVEL 10 n Set the HP 8340A frequency C 100 Gam On the spectrum analyzer press sweep and after completion of sweep PEAK SEARCH Record maker amplitude in column 2 of Table 3 1 Repeat steps 16 and 17 for HP 8340A CW frequencies of 150 MHz and 200 MHz Replace the adapter o on the pe analyzer input with the HP 11947A Transient Limiter Repeat steps 16 17 and 18 and record the marker amplitude in column 3 of Table 3 I Subtract the readings i in colani 3 from those i in column 2 and record the difference in column 4 of Table 3 1 Compare the results in column 4 with the limits in clama 5 of Table 3 1 ov 100 kHz 100 MHz 150 MHz 200 MHz Column 1 Column 2 Column3 Column Coloma 5 Frequency Input Level dBm Output Level dBm Insertion a dB Limits dB Table 3 1 Insertion Loss Frequency Response 9 5 to 10 5 9 5 to 10 5 9 5 to 10 5 9 5 to 10 5 9 5 to 10 5 9 5 to 10 5 9 5 to 10 5 9 5 to 12 2 9 5 to 12 2 9 5 to 12 2 HP 11947A Operation and Service Manual 7 Limiting Description To check the typical limiting threshold requires a high power source greater than 17
8. dBm However the limiting action can be verified by testing the HP 11947A Transient Limiter in reverse bypassing the input attenuation Equipment Synthesizer Function Generator ccc cece eec cece aasaran HP 3325A Digital Voltmeter A dass od HP 3456A Procedure 1 Cycle power on the HP 33254 to reset it 2 Connect the HP 11947A Transient Limiter output to the HP 3325A output using the Type N to BNC adapter 3 Connect the HP 11947A transient ate input to the HP Ha volts s input using a BNC cable and a BNC to banana plug adapter 4 Set the HP 3325A controls as follows DIO 5 Press on the HP 3456A and select 6 If the HP 3456A reads less than 0 52 V the limiting action is working If the HP 3456A reads more than 0 60 V at least one limiting diode is open and the limiting action is impaired 7 H the HP 3456A reads between 0 52 V and 0 60 V additional testing is required to determine if the limiting action is working Complete steps 8 through 16 8 Remove the HP 11947A plastic housing Carefully pry the halves of the housing apart by inserting a flat blade screwdriver between the Type N connector and the housing 9 Remove the two screws holding the shielding can and remove the shielding can The circuit board now is exposed 10 Connect the HP 3325A to the end of R6 closest to CR2 See Figure 4 1 11 Set the HP 3325A controls as follows Gaza NO amero 10 Vout 12 Select on the HP
9. epair this Prodi must be returned to a service facility designated by Hewlett Packard Buyer shall prepay shipping charges to Hewlett Packard and Hewlett Packard shall pay shipping charges to return the product to Buyer However Ban shall pay all shipping i le dates and taxes for pane returned to pada Packard from another country E E 3 y Hewlett Packard warrants that its software and firmware designated by Hewlett Packard for use with an instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not warrant that the sprain of the instrument or _ software or firmware will be uninterrupted or error free eee LIMITATION OF WARRANTY Kk The foregoing warranty shall not KUAN to defects A from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the ota ia pin for te Kia or improper site preparation or maintenance a es ba Bag bit NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HEWLETT PACKARD 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 HEWLETT PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY Assistance Product maintena
10. g for example an HP 3577A Equipment y Spectrum Analyzer AIR HP 8566A B HP 8558A B Synthesized Sweeper oooooomoncorrorrcsmonorsrccanananincoso HP 8340A Erequency Synthesizer saa LARGE ANAND AKNG PG ule een away HP 3335A Adapter Type N myto BNC I waaa ANAN soara aaa 1250 1250 Procedure 1 Connect the HP 3335A 50M output to the spectrum analyzer input using a BNC cable and the Type N to BNC adapter Cycle power on the HP 33354 this resets the instrument 3 On the HP 3335A press AMPLITUDE 20 Cim 11 12 13 Set the spectrum analyzer controls as follows START FREQ 5 Ci STOP FREQ 110 ai VIDEO BW 1 61 Set the HP 3335A frequency aa 9 GE On the spectrum analyzer press sweep and after completion of sweep PEAK SEARCH Record marker amplitude in column 2 of Table 3 1 Repeat steps 5 and 6 for HP 3335A frequencies of 10 kHz 30 kHz and 100 kHz Set the spectrum analyzer controls as follows _ START FREQ 500 kHz STOP FREQ 31 MHz Repeat steps 5 and 6 for HP 3335A frequencies of 1 MHz 10 MHz and 30 MHz 10 Replace the adapter on the spectrum analyzer input with the HP 11947A Transient Limiter Repeat steps 4 through 9 recording the marker amplitude in column 3 of Table 3 1 Remove the HP 11947A Transient Limiter Connect a cable from the HP 8340A RF output to the spectrum analyzer input using the Type N to BNC adapter and other adapters as require
11. inside or outside J the instrument or disconnection of the protective earth terminal can result in personal injury Warning __ There are many points in the instrument which can if contacted cause personal FEREN 7 injury Be extremely careful o Any adjustments or service procedures that require operation of the instrument with protective covers removed should be performed only by trained service personnel Caution Before this instrument is switched on make sure its primary power circuitry has been adapted to the voltage of the ac power source y Failure to set the ac power input to the correct voltage could cause damage to the instrument when the ac power cable is plugged in 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 Institute of Standards and E Technology to the extent allowed by the Institutes Calibration facility and to the calibration i 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 apo either repair or replace products which prove to be defective For warranty service or r
12. nce agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Contents i General Information Introduction sa WA Specifications Description da Ke Initial Inspection 2 Operation l Description a a e Mating Connectors Operating Environment Storage and Shipment 3 Operation Verification Insertion Loss and Frequency Response Description Equipment e s e s es AA Procedur s e o u mor w w o A Description ee a Equipment s s s amp amp ww a Ge Proced r e ane AA air 4 Service l Disassembly ang Replacement Parts mn o DD NI hat a Gt Or 6 6 6 6 8 8 8 3 se v 3 veme 4 HP 11947A Operation and Service Manual 1 General Information Introduction The Hewlett Packard Model 11947A Transient Limiter is an instrument accessory that protects input circuitry from transients and accidental overloads This operation and service manual explains how to use the limiter briefly describes tests that can be used to verify its specifications and suggests the actions to take should the limiter need repair Specifications Specifica
13. or repair Replacement Parts To order a part listed in Table 4 1 specify the Hewlett Packard part number and check digit indicate the quantity desired and address the order to the nearest Hewlett Packard office The check digit expedites processing of the order A list of Hewlett Packard Sales and Service Offices is provided at the end of Chapter 1 of this manual HP 11947A Operation and Service Manual 9 Table 4 1 11947A Replaceable Parts CG a Designation Part Number 11947 80001 LABEL 11947A 4 PARTS 11947 60001 BOARD ASSY LIMITER 85025 40001 HALF BODY 0515 0221 CAP M2 0 x 6 0 HEX 85025 20007 CAN RECT 21 x 32 MM 11947 20004 FRAME 11947 20002 NUT ADAPTER J2 3050 1266 WASHER FL 0 385 ID 32 11947 20003 SPACER BNC J1 0515 1773 SCREW 2 5 MM 1250 0083 RF CONNECTOR BNC FEMALE 1250 2183 RF CONNECTOR TYPE N MALE 0160 5444 CAPACITOR CER 0 47 p 200V 0160 5444 CAPACITOR CER 0 47 j 200V 5082 1001 DIODE HIGH G 5082 1001 DIODE HIGH G 1901 0050 DIODE SW 80V 0 2A 1901 0050 DIODE SW 80V 0 2A 11947 80002 INDUCTOR 1 mH 25 0698 3607 RESISTOR 18 OHM 5 2W 0757 1092 RESISTOR 287 OHM 1 0 5W 0757 1092 RESISTOR 287 OHM 1 0 5W 0757 1001 RESISTOR 56 2 OHM 1 0 5W 0757 1060 RESISTOR 196 OHM 1 0 5W 0757 1001 RESISTOR 56 2 OHM 1 0 5W 0757 0379 RESISTOR 12 1 OHM 1 0 12W 0757 0403 RESISTOR 121 OHM 1 0 12W 0698 3447 RESISTOR 422 OHM 1 0 12W 1970 0073 SURGE PROTECTOR 90V
14. range for the repair or replacement of the instrument without waiting for claim settlement HP 11947A Operation and Service Manual 3 Table 1 2 Hewlett Packard Sales and Service Offices US FIELD OPERATIONS EUROPEAN OPERATION INTERCON OPERATIONS HEADQUARTERS HEADQUARTERS HEADQUARTERS Hewlett Packard Company Hewlett Packard S A Hewlett Packard Company 19320 Pruneridge Avenue 150 Route du Nant d Avril 3495 Deer Creek Rd Cupertino CA 95014 USA 1217 Meyrin 2 Geneva Palo Alto California 94304 1316 408 973 1919 Switzerland 415 857 5027 41 22 780 8111 California Australia Hewlett Packard Co France Hewlett Packard Australia Ltd 1421 South Manhattan Ave Hewlett Packard France 31 41 Joseph Street Fullerton CA 92631 Avenue Du Canada Blackburn Victoria 3130 714 999 6700 Zone D Activite De Courtaboeuf 61 3 895 2895 kai F 91947 Les Ulis Cedex Hewlett Packard Co France Canada 301 E Evelyn 33 1 69 82 60 60 Hewlett Packard Canada Ltd Mountain View CA 94041 17500 South Service Road 415 694 2000 Germany Trans Canada Highway Hewlett Packard GmbH Kirkland Quebec H9J 2X8 Colorado sta 4 Berner Strasse 117 Canada Hewlett Packard Co 6000 Frankfurt 56 514 697 4232 24 Inverness Place East West Germany Englewood CO 80112 49 69 500006 0 303 649 5000 ih Japan Great Britain ss Yokogawa Hewlett Packard Ltd Georgia Hewlett Packard Ltd r 1 27 15 Yabe Sagamihara Hewlett Packard Co
15. tions and APA are listed in Table 1 1 These are performance standards or limits against which the instrument may be tested l Table 1 1 Specifications and Characteristics SPECIFICATIONS Frequency Range 9 kHz to 200 MHz Insertion Loss a gt 30dB 33 below 2 KHz 10 dB 0 5 dB 9 kHz to 50 MHz 10 dB 2 2 dB 0 5 dB 50 MHz to 200 MHz i g Calibration Accuracy 40 2dBat25 C Maximum Input Level _ Continuous 2 5 W average 34 dBm Pulse o 10 kW for 10 HS DC Voltage 12 V Connectors Input BNC female Output Type N male so HP 11947A Operation and Service Manual 1 Table 1 1 Specifications and Characteristics continued CHARACTERISTICS Insertion Loss 13 dB lt 6 kHz gt 400 MHz wa Impedance 509 Reflection Coefficient Input 20 13 1 3 SWR 9 kHz to 50 MHz lt 0 26 1 7 SWR 50 MHz to 200 MHz RE i Output gt lt 0 09 1 2 SWR 9 kHz to 50 MHz lt 0 29 1 8 SWR 50 MHz to 200 MHz Limiting Threshold 50 mW 17 dBm Overall Length 138 mm 5 4 inches Description The HP 11947A Transient Limiter is a unidirectional solid state passive device for use from o 9 kHz to 200 MHz It consists of a diode limiter a 10 dB attenuator and a high pass filter i integrated into a 502 transmission line The transient limiter has no adjustments The SWR characteristics in Table 1 1 apply below the limiting threshold SWR above the threshold is unpredictable since the HP 11947A
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