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Fluke 8920A User's Manual

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1. complete line of static shielding bags and acces sories is available from Fluke Parts Department Telephone 800 526 4731 or write to 7 AVOID PLASTIC VINYL AND STYROFOAM JOHN FLUKE MFG CO INC IN WORK AREA PARTS DEPT M S 86 9028 EVERGREEN WAY ES EVERETT WA 98204 PORTIONS REPRINTED WITH PERMISSION FROM TEKTRONIX INC AND GENERAL DYNAMICS POMONA DiV m Dow Chemical J0089D 07U8604 SE EN Litho in U S A Page 2 of 2 Rev 1 MAR 86 5 j 1 2 A E 4 AE Xin bii 2 1 INTRODUCTION 2 2 The information we have presented in this section is intended to familiarize vou with the capabilities and limitations of the Models 8920A and 8921A We have included instructions for the installation and operation of both models as well as a brief description and identification of each control and indicator on the instrument 2 3 SHIPPING INFORMATION 2 4 Models 8920A and 89214 are packaged and shipped in a protective container When vou receive the equipment make a thorough inspection for any possible shipping damage 2 5 If you determine reshipment of the instrument is necessary we recommend that you use the original container If the original container is not available new one may be obtained from the John Fluke Mfg Co Inc Please indicate the instrument s model number 8920A or 8921A when requesting a new
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3. 604 6 8920A 8921A 1 1 INTRODUCTION NOTE Unless otherwise specified all information figures tables and general data presented this manual are applicable to both Model 89204 and 89214 True RMs Voltmeters 1 2 The Models 8920A and 8921A digital true rms voltmeters capable of accurately measuring the true rms value of nonsinusoidal signals containing AC or AC DC components Both havea frequency range of 10 Hz to 20 MHz with a full scale crest factor of seven and are capable of displaying measurements in either volts or dB units 1 3 Selecting the VOLTS position on the dB VOLTs switch enables the volts display mode and three applicable front panel annunciators V mV and 2 MHz In this mode the instruments displaya31 2digit figure to indicate the true rms value of any AC or AC DC input signal whose amplitude is between 180 uV and 700V rms 1000V peak 1 4 The dB display mode logarithmic is enabled when dB is selected on the front panel dB VOLTS display switch In this mode the instruments displava41 2 digit dBm value of the input signal referenced to l of 12 manually selected impedances 50 to 1200 ohms The dB display mode also uses three annunciators dB RELATIVE REFERENCE and 2 MHz MAX to establish the instrument s operating status The RELATIVE REFERENCE annunciatory lights whenever the REL switch is depressed to indicate that any further dB measurements w
4. John Fiuke Mfg 29 inc 305 896 4881 IL Palatine John Fiuke Mig Co inc 312 398 5800 312 392 9510 MD Rockville John Fiuke Mfg Co inc 301 770 1576 NJ Paramus John Fluke Mig ine 201 262 8550 TX Dalins John Fluke Mig Cr inc 214 869 0311 WA Everett John Flute Mfg Oc Inc 206 356 5560 Other Countries Argentina Buenos Aires Coasin S A Tel 552 5248 TLX 390 22284 Australia instruments Pty Lic Tel 3569 3658 FLX 790 AA44062 Australis Concord Eimeasco instrument Ltd Yet 736 2888 FLX 790 AA25887 Australia Ringwood Eimeasco instruments Pty 49 Tel 879 2322 TLX 4790 A4A36206 Austria Vienne Walter Rekirsch Elektronische Geraie GmbH Co Tel 235555 TLX 847 134759 Belgium Brusseis Fluke Belgium SA NA Tei 2164090 TLX 846 26312 Brazil Sao Paulo Hi Tek Eletronica Lida Tel 421 5477 TLX 1391 1135589 Canada Crawford Associates Ltd Tei 604 294 1326 TLX 0454247 7 Calgary AB Alian Crawford Asacciates Ltd 403 291 3477 TLX 03821186 Canada Mississauga ON Allan Crawford Associates Ltd Tei 416 890 2010 TLX 0696 1235 Canada St Laurent PQ Alian Crawford Associates Ltd Tot E 31 8564 C5824944 Chile Lide 55250 TEX 332 240301 China
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7. 3 11 continued on page ii 8920A 8921A TABLE OF CONTENTS continued SECTION TITLE PAGE 4 MAINTENANCE y u ie fade iar sata ate Et 4 1 4 1 INTRODUCTION 4 1 E 4 4 GENERAL MAINTENANCE 4 1 4 5 ACCESS Sus ct hud eos y Cheers ehh 4 1 4 7 INPUT POWER SELECTION pos ROLE NA qae 4 1 4 9 CRAVING te Gin eis eta 4 1 4 11 Fuse eves 4 3 4 13 PERFORMANCE CHEER eas ois Sac Ee us 4 3 4 15 Low and Midband Performance Check Volts Display Mode 4 3 4 17 dB Display Mode Cheek as erm Cones Y ER Phe 4 3 RT 4 19 DC Eau Level hack RICE CERE FRE Ed Ra aa tpa eA EO 4 5 2 4 21 AG LOW Level Check fiw np e tessuti v essi NA ote eR 4 5 4 23 High Frequency Response Check 4 5 4 25 CALIBRATION Adria 4 5 P 4 28 Power Supply 4 5 4 30 Low and Midband Accuracy Adjustments 4 10 4 32 Linear Analog Output 8920A only 4 10 4 34 Low Level Calibration d 4 10 4 36 High Frequency Calibration 4 13 4 38 RMS Protection Circuit Calibration 4 13 4 40 TR
8. 8920A 1601 Figure 4 5 Calibration and Test Point Locations 4 8 8920A 8921A U1 RMS Sensor e w 8920A 1603 041 Figure 4 5 Calibration and Test Point Locations cont 4 9 8920A 8921A Table 4 6 High Frequency Response Check FUNCTION INPUT LIMITS RANGE DISPLAY COMMENTS AC 2 Adjust the SG503 amplitude AUTORANGE so that the display reads 17 00 AC Readjust the input frequency AUTORANGE without changing the amplitude AC Adjust the SG503 amplitude so AUTORANGE the display reads 170 0 Readjust the input frequency AUTORANGE without changing the amplitude AC Adjust the 56503 amplitude so AUTORANGE the display reads 1 700 2 i Readjust the input frequency AUTORANGE without changing the amplitude 4 30 Low and Midband Accuracy LAO Adjust R224 for the same reading as the m Adjustment display 2 mV t 4 4 31 Use the following procedure to calibrate the low 4 Observe that the null peak meter reads center and midband accuracy of the UUT of scale 1 2 division l Place all the front panel switches in the out 5 Push RANGE HOLD and decrease the input position except LO RANGE ENABLE to 0 1 V 500 Hz The output voltage should read the i same as the front panel display 0 2mV is not 2 Short TP204 to TP209 to light the 4th display within this limit adjust R234 and go back to step 3 digit f
9. John Fluke Mfg Co Inc Some semiconductors and custom IC s can be damaged by electrostatic discharge during handling This notice explains how you can minimize the chances of destroying such devices Knowing that there is a probiem Learning the guidelines for handling them Using the procedures and packaging and bench techniques that are recommended lt The Static Sensitive S S devices are identifiedin the Fluke technical manual parts list with the symbol The following practices should be followed to minimize damage to S S devices 3 DISCHARGE PERSONAL STATIC BEFORE HANDLING DEVICES USE A HIGH RESIS 1 MINIMIZE HANDLING TANCE GROUNDING WRIST STRAP 2 KEEP PARTS IN ORIGINAL CONTAINERS UNTIL READY FOR USE 4 HANDLE S S DEVICES BY THE BODY Page 1 ot 2 WHEN REMOVING PLUG IN ASSEMBLIES HANDLE ONLY BY NON CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC FREE WORK STATION PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS TO PROTECT INSTALLED SS DEVICES 5 USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT 6 DO SLIDE S S DEVICES OVER ANY SURFACE 9 HANDLE S S DEVICES ONLY AT A STATIC FREE WORK STATION 10 ONLY ANTI STATIC TYPE SOLDER SUCKERS SHOULD BE USED 11 ONLY GROUNDED SOLDERING IRONS SHOULD BE USED _
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11. 1 28641 2 TLX 954 21321 Sweden Teieinstrument AB Matteshoimsvagen 138 Box 4490 162 04 Vallingby 4 Sweden 8 380370 TLX 854 15770 Switzeriand w Traco Electronic AG Jenatschstrasse 1 8002 Zurich Switzerland Tei 1 201 0711 TLX 845 815570 Syria Mabek Electronics Division Box 4238 Damascus Syria Taiwan Schmidt Electronics Corp Sth Fl Cathay Min Sheng Building 344 Min Sheng East Road Taipei 104 Taiwan R O C Tel 2 501 3468 TLX 785 11111 Thailand Measuratronix Ltd 2102 63 Ramkamhaeng Bengkok 10240 Thailand 5 Tei 2 378 2516 TLX 788 82796 Tunisia Selep SARL 6 Rue de Sparte Tunis 1000 Tunisia Tet 1 248093 TLX 934 13030 Turkey Erkman Elektronik Ticaret Anonim Sirketi Necatibey Cad 92 3 Karakoy Istanbul Turkey Tel 11 4415461 TLX 821 24399 United Arah Emirates Al Sanani Cen Trad Est P O Box 7187 Abu Dhabi UAE 2 821370 or 821371 TLX 958 23966 Haris Al Afag Ltd P O Box 545 Sharjah UAE Tet 6 359120 958 68540 Uruguay Coasin Uruguaya S A Libertad 2529 Casilla de Correo 1400 Montevideo Uruguay Tet 2 789015 TLX 398 UY23010 9558 Amtest Associates Ltd Clarence House 31 Clarence St Staines Middiesex TW18 4SY England Tel 784 63555 TLX 851 928855 Venezuela Coasin
12. 13606 Use 56289 Sprague Electric Co Transistor Div Concord New Hampshire 13839 Replaced by 23732 14099 Semtech Corp Newbury Park California 14140 Edison Electronic Div Mc Gray Edison Co Manchester New Hampshire 14193 Cal R Inc formerly California Resistor Corp Santa Monica California 14298 American Components inc an Insiico Co Conshohocken Pennsylvania 14655 Cornell Dubiier Electronics Division of Federal Pacific Electric Co Govt Control Dept Newark New Jersey 14752 Electro Cube Inc San Gabriel California 14869 Replaced by 96853 14936 General Instrument Corp Sem Conductor Products Group HiCksvilie New York 15636 lec Trol inc Saugus California 15801 Fenwal Electronics Inc Div of Kidde Waiter and Inc Framingham Massachusetts 15818 Teledyne Semiconductors formeriy Ameico Semiconductor Mountain View California 15849 Litton Systems inc Useco Div formerly Useco Inc Van Nuys California 15898 International Business Machines Corp Essex Junction Vermont 15909 Repiaced by 14140 16258 Space Lok inc Burbank California 16299 Corning Glass Eiectronic Components Div Raleigh North Carolina 16332 Repiaced by 28478 16473 Cambridge Scientific Ind Div of Chemed Corporation Cambridge Maryiand 16742 Paramount Plastics Fabricators Inc Downey California 16758 Delco Electronics Div of Genera Motors
13. Bahrain Box 5701 Manama Bahrain Tei 251 364 TLX 855 9003 Bangladesh Motherland Corporation 24 Hatkhola Road Tikatuli 3 Bangladesh Tel 257249 or 255776 TLX 950 642022 Belgium Fluke Belgium S A N V 6 Rue de Geneve 1140 Brussels Belgium Tel 2 2164090 TLX 846 26312 Bolivia Coasin Bolivia S R L Casilla 7295 La Paz Bolivia Tel 2 40962 TLX 336 5255 Brazil Hi Tek Eletronica Ltda Al Amazonas 422 Aiphaville Barueri 06400 Sao Paulo Brazi Tet 11 421 5477 TLX 391 01135589 Brunei Rank O Connor s Berhad No 8 Bik D Sufri Shophouse Complex Mile 1 Jalan Tutong Bandar Seri Begawan Negara Brunei Darussalam 2 23108 or 23557 TLX 799 2265 RANKOC Canada Allan Crawford Assoc Ltd 5835 Coopers Avenue Mississauga Ontario L4Z 1Y2 Canada Tel 416 890 2010 TLX 0696 1235 Allan Crawford Assoc Ltd 7018 Cote de Liesse St Laurent Quebec Canada Tel 514 731 8564 TLX 05824944 Crawford Assoc Lid 2625 Queensview Drive Ottawa Ontario K2B 82 Canada Tei 613 596 9300 TLX 0533600 Allan Crawford Assoc Ltd Suite No 106 4180 Lougheed Hwy Bumaby British Columbia V5C 6A7 Canada Tel 604 294 1326 TL X 0454247 Allan Crawford Assoc Ltd 1935 30th Avenue Calgary Aiberta T2E 625 Canada Tet 403 230 1341 TLX 03821186
14. TO 2 509090 ic RED UE is paqa BIr y E AA K i 1 oer OvO Zora 5 i uT 77018 Oca 319 A E AZ 687 0268 uondo ndino Bojeuy yoo 9 8 s1nBt4 7191 90568 OL ZOSO OL Cu 1054 105 1 v 268 70268 2002 Bojeuy t00 9 8 o1n814 t101 v0268 Lya yO Siw NI TIN 2 N TON yiSiS duy Tw SS awd SALON tosa NSi 33507 9 NIGA N A PCM KISS TTA uie 3058 L9 1 mer TONS 105 g 001 WGI 10S 8 205 NSI 70541 22 505 ASI M QOSdi A34 Lr WI 0S8 MOV Bs 9713 23 5935 NO Wi 5057 LN i3101 3 20981 1268 70258 Wa tied E FL IU yl AL Huntsville John Fluke Mig Co Inc 4920 Corporate Drive Suite J Huntsville AL 35805 6202 205 830 9671 AZ Tempe John Fluke Mfg Co inc 2211 5 48th Street Suite 8 Tempe AZ 85282 602 438 8314 CA Burbank John Fiuke Mfg Co 2020 N Lincoin Street Burbank
15. 10 mV 20 mV 10K Chk 10 000 20 digits 10 mV 20 mV Chk 10 000 20 digits 10 20V 500 Chk 10 000 5 digits 10 _ 20V 10K Chk 10 000 20 digits 10 20V 50K Chk 10 000 5 digits 10 20V 20K Chk 10 000 0 to 70 digits Remove the short between TP204 and TP209 Autorange into the 20 mV range and push RANGE HOLD Monitor the DC voltage on TP4 with a DVM and apply 20 6 mV 500 Hz to the input Note the DVM reading Increase the input to 206 mV and check the DVM for a reading 07 02 or 01V smaller than the reading noted in the previous step If the reading is outside these limits refer to the calibration procedure of the rms sensor protection RMS Protection Circuit Calibration BANANA TO BNC ADAPTER AC CALIBRATOR 5200A SHIELDED CABLE Figure 4 6 Linear Analog Output Test Set Up 8920A only 8920A 8921A 4 36 High Frequency Calibration 4 37 Use the following procedure to calibrate the UUT s high frequency response 1 For the ranges shown in Table 4 8 adjust the amplitude of the leveled generator at 50 kHz to establish a reference refer to Figure 4 7 for the test setup Use one 20 dB attenuator for 0 1V two attenuators for 0 01 and three attenuators for 001V terminated with 50 ohms Take care not to overdrive the transfer standard 2 Note the reading at the output of the
16. 1621 wA 933 5 13 8920A 8921A Table 5 3 A1 8921A Main PCB Assembly cont ITEM NO DESCRIPTION XR204 SOCKET RESISTOR 9200 SOCKET IC 14 PINS NOT SHOWN xu202 SOCKET IC NOT SHOWN XU203 SOCKET IC NOT SHOWN XU205 SOCKET IC 40 PINS NOT SHOWN gt IF VR201 IS REPLACED THE A D CALIBATION RESISTOR R204 MAY HAVE TO BE RESELECTED SEE SECTION 4 A D CALABRATION RESISTOR SELECTION 8920A 8921A FLUKE STOCK ND 353285 310305 343285 343285 429282 MFG SPLY CODE 0779 01295 00779 00779 09922 MFG PART NO OR TYPE 2 33127 6 931402 2 331271 6 2 331271 6 DILBAOP 108 QTY EN ITEM A1 C200 C201 C202 C203 C204 C205 C206 C207 C208 C209 C210 C211 C212 CR200 CR201 CR202 CR203 CR204 CR205 CR206 CR207 F1 H200 H201 H202 H205 H206 H207 H208 43 J J5 J6 7 4101 4102 J103 J203 J301 4401 4501 J601 1200 L201 1 1 MP203 MP204 Table 5 3 A1 8921A Main PCB Assembly DESCRIPTION MAIN PCB ASSY 8921A 4011 FIG 5 3 DISPLAY ASSEMBLY 8920A 8921A FIG 5 4 CAP PLYPRP O 47 UF 10 100V 0 47 UF 20 35V CAP MICA 150 51 500V CAP PLYSTR O 22 UF 10 100V CAP CER 10 000 PF 20 100V CAP CER 10 000 PF 20 100V CAP MICA 870 5 500V 3000 PF 51 500V CAP ELECT 220 UF 10
17. 28214 Minnesota Mining amp Mig Co Consumer Products Div S Paui Minnesota 28425 Serv Link formerly Bohannan industries Fort Worth Texas 28478 Dettrot Contrats Dr Corporation Milwaukee Wisconsin Federal Supply Codes for Manufacturers cont 28480 Hewlett Packard Co Corporate HQ Paio Aito California 28520 Heyman Mfg Co Kenilworth New Jersey 29083 Monsanto Co Inc Santa Clara California 29604 Stackpoie Components Co Raleigh North Carolina 30148 AB Enterprise inc Ahoskie North Carobna 30323 Hinos Tool Works Enc Chicago 31091 Optimax Inc Cotmar Pennsylvania 32539 Mura Corp Great Neck New York 32767 Griffith Plastic Corp Buringame California 32879 Advanced Mechanica Components Norinndge California 32897 Erie Technological Products Inc Frequency Control Div Carisie Pennsyivania 32997 Bou ns inc Trimpot Products Division Riverside 33173 Genetai Electric Products Dept Owensboro Kentucky 34333 Siticon General Westminister Ca itormia 34335 Advanced Micro Devices Sunnyvale 34802 iectromotive Inc Kenilworth New Jersey 37942 Mallory 4 Inc Indianapolis Indiana 42498 National Radio Meirose Massachusetts 43543 Nytronics inc Transtormer Co Div Geneva New York 44655 Onmite Mtg Co Skokie Illinois 49671 RCA Corp New York New York 49956 Raytheon Company
18. 5 1 4W 147926 01121 105 REF R31 RES MF 8 06K 1 1 8W 294942 91637 558061 1 5 20 8920 8921 Table 5 5 A2 8920A 8921A AC PCB Assembly cont FLUKE MFG ITEM MFG PART NO ToT REC NO DESCRIPTION ms tine OR TYPE FZ IF ANY ONE OF THE FOUR MATCHED XISTORS ARE DAMAGED ALL FOUR WILL HAVE TO BE REPLACED AND THE DC OFFSET RESISTORS FOR AND AMP B WILL HAVE TO RESELECTED THEREFORE IT WILL BE NECESSARY TO ORDER TWO RESISTOR SETS SEE SECT 4 DC OFFSET RESISTOR SELECTION D THIS PART IS REPLACED THE DC OFFSET RESISTOR FOR THE CORRESPONDING AMPLIFIER AMP A AMP B MAY HAVE TO BE RESELECTED SEE SECT 4 DC OFFSET RESISTOR SELECTION 5 23 8920A 8921A re or EN E Ene Jo a n our BS sa 695 Figure 5 5 A2 8920A 8921A AC Assembly x T 8920A 8921A ITEM NO R33 R34 R35 R36 R37 R38 R39 RHO R41 R42 R43 RH 4 45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 R60 R62 R63 R65 R66 R67 R68 R69 870 R7 1 R72 873 R74 R75 R76 R77 R78 R79 R80 R82 R83 R84 R85 Table 5 5 A2 89204 8921 AC PCB Assembly cont DESCRIPTION RES COMP 33 5 1 4W SELECTED IN TEST RES SET R18 R35 R65 R79 RES MF 619 1 1 8W RES COMP 100 5 1 4W RES MF 619 1 1 8W RES COMP 33 5 1 4W RES COMP 820 5 1 4W RES COMP 22K 4 5
19. 55 transfer standard and maintain this by readjusting the generator s level for other frequencies 4 38 RMS Protection Circuit Calibration CAUTION R111 controls the protection circult for the RMS Sensor DO NOT make any adjustments to R111 other than those listed below Indiscriminate adjustments may cause component damage 4 39 Use the following procedure to calibrate the protection circuit of the rms sensor This procedure should be completed only if the rms sensor or any component in the protection circuit has been replaced or if the limit in step 22 of Table 4 9 cannot be met Table 4 8 High Frequency Calibration STEP SOURCE UUT SOURCE ADJUST UUT LIMIT LEVEL RANGE FREQ DISPLAY COUNTS 00 50K source R43 Chk source C33 Chk Chk source C58 source R5 10 3 Reduce the frequency to the point between 1 and 2 MHz where the maximum reading 4 on the display occurs If too high turn C13 clockwise a few turns If it is too low turn C13 counterclockwise Then return to step 1 of this table 4 13 8920A 8921A SHIELDED CABLE 4 14 55 1V TRANSFER STANDARD SET DVM TO 200 mV RANGE 8920A 8921A TERMINATION MUST BE CONNECTED AS CLOSE AS POSSIBLE TO THE INPUT OF THE 8920A OR 8921A Figure 4 7 High Frequency Calbration Test Set Up NOTE The ambient temperature must be 23 C X 5 and the 157 supplies must calibra
20. 91637 01121 89536 89536 18324 18328 02735 07910 07910 07910 07910 52072 52072 52072 52072 MFG PART NO TYPE CB1615 CB3015 CB3015 CB1805 CB1805 CMF551001F CMF55 1000F CMFOST501F CMF555112F CB1025 458299 CMF552052F CMF554993F 309674 CMF553573F CMF553573F CMF552052F 458299 CMF558252F CMF558252F CMF552001F 327569 CMF553011F CMF551693F CB5115 CMF55 1432F CMF551001F CB1545 489377 357830 LM358 CR3999 LM358 CR3999 CA3016 IN752A IN752A IN4571 IN964B CA 05S TSD CA 05S TSD CA 05S TSD CA 053 TSD TOT REC QTY REF mum EX 6 1 INTRODUCTION 6 2 This section of the manual contains information concerning the options and accessories available for use with the Model 8920A or 8921A It consists of introductory section an accessories subsection and a series of option subsections All options and accessories are listed by model or option number in the table of contents included in this section 6 3 Hardware type accessories i e rack mounting kits and cables are documented in the accessories subsection Section 6 Option amp Accessory Information While option numbers 003 004 are documented as individual subsections Each subsection contains all of the information necessary to install operate and maintain each option and accessory This includes a list of replaceable parts
21. 96881 Thomson Industries Inc Manhasset New York 97540 Master Mobile Mounts Div of Whitehall Electronics Corp Ft Meyers Florida 97913 Industrial Electronic Hardware Corp New York New York 97945 Penwalt Corp SS White Industrial Products Div Piscataway New Jersey 97966 Replaced by 11358 98094 Replaced by 49956 98159 Rubber Teck Inc Gardena California 98278 Maico A Microdot Co Inc Connector amp Cable Div Pasadena California 98291 Sealectro Corp Mamaroneck New York 98388 Royal Industries Products Div San Diego California 98743 Repiaced by 12749 95925 Replaced by 14433 99120 Piastic Capacitors Inc Chicago Illinois 99217 industries Elect Comp Div formerly Southern Elect Div Burbank California 99392 STM Oakiand California 99515 ITT Jennings Monrovia Plant Div of ITT Jennings formerly Marshali Industries Capacitor Div Monrovia California 99779 Use 29587 Corp Barnes Div Landsdowne Pennsylvania 99800 American Precision Industries Inc Detevan Division East Aurora New York 99942 Centrelab Semiconductor Centrelab Electronics Div of Globe Union Inc Ei Monte California Toyo Electronics R Ohm Corp Irvine California National Connector Minneapolis Minnesota 7 7 7 8 INTRODUCTION This appendix contains information necessary to backdate the manual to conform
22. Crawford Assoc Ltd 800 Windmill Road Suite 205 Dartmouth N S 111 Canada Tet 902 463 8640 Chile o Intronica Chile Ltda Manuel Montt 024 01 D Casilla 16228 Santiago 9 Chite Tei 2 44940 TLX 332 240301 China Peoples Republic of e Fiuke international Corp Box C9090 M S 206A Everett WA 98206 U S A Tet 206 356 5511 TLX 185103 FLUKE UT Colombia e Sistemas E instrumentacion Ltda Carrera 13 No 37 43 Oft 401 Ap Aereo 29583 Bogota DE Colombia Tet 232 4532 396 45787 Cyprus w Chris Radiovisson Lid P O Box 1989 Nicosia Cyprus 21 66121 TLX 826 2395 Cyprus Northern Ucok Buroteknik 2C amp 2D Muftu Ziya Street Lefkosa Northern Cyprus Mersin 10 Turkey Tet 741 357 20 71777 TLX 821 57267 Czechoslovakia Amtest ssociates Ltd Clarence House 31 Clarence Street Staines Middiesex TW18 45 England Tei 784 63555 TLX 851 928855 Denmark Tage Olsen A S Byvej 222 2750 Ballerup Denmark Tei 2 658111 TLX 855 35293 Ecuador Proteco Coasin Cia Ltda Box 228 Ave 12 de Octubre 2285 y Orellana Quito Ecuador Tel 2 529684 TLX 393 2865 Proteco Coasin Cia Ltda P O Box 9733 Ave Principal No 204 y Caile Segunda Urbanizacion Miraflores Guayaquil Ecuador 4 387519 Egypt and Sudan a Electronic Engineering Liaison Office P O Box 2891 Horreya Heli
23. milliwatt reference are defined as dBm The milliwatt reference is generally assumed as indicated m However the system impedance must be specified for a particular measurement Once the impedance is known and selected the instrument will display its measurements in dBm 2 58 The 8920 8921 is equipped with a rotary switch called dBm REFERENCE By setting the switch to 1 01 12 possible standard reference impedances 500 750 930 1100 1240 1350 1500 3000 6000 9000 10000 and 12000 vou establish that impedance as a reference When the system impedance and the reference are the same the 8920 8921A manipulates subsequent measurements to readout in terms of dBm NOTE If the 1000 ohm reference impedance is selected d BV on the rotary switch the 0 dB point will correspond to 2 59 dBm REFERENCE SELECTION 2 60 Use the following procedure to select a reference impedance and enable the dBm display mode TP2 1 Measure 1V 2 Press dB then rel buttons 3 1V becomes 0 dB reference l Depress the dB VOLTS switch in 2 Release the REL dBm switch out 3 Set the dBm REFERENCE Q switch to correspond with the system impedance NOTE The dBm REFERENCE switch does not affect the fixed 10 input impedance of the 89204 8921 4 All impedance matching terminations must be added by the operator 2 61 RELATIVE MEASUREMENTS REI 2 62 This feature allows you to make any voltage in
24. 12 1 8W RES VAR CER 10K 101 1 2W RES MF 357K 11 1 8W RES MF 110K 1 1 8W RES MF 20 5K 11 1 8W SELECTED IN TEST RES MATCHED SET RES MF 82 5K 1 1 8W RES MF 82 5K 1 1 8W RES MF 2K 1 1 8W SELECTED IN TEST RES VAR CER 5K 101 1 2W RES MF 3 01K 1 1 8W RES MF169K 1 1 8W RES COMP 510 5 1 4W 5 14 3 4 1 1 8W RES MF 1K 11 1 8W RES COMP 150K 4 5 1 uW RMS SENSOR KIT AMP J FET IC LINEAR OP AMP IC LINEAR OP AMP IC LINEAR 5 XSTR ARRAY DIODE ZENER 5 6V DIODE ZENER 5 6V DIODE ZENER DIODE ZENER 13V SOCKET IN LINE 5 CNTCT NOT SHOWN SOCKET IN LINE 5 CNTCT NOT SHOWN SOCKET IN LINE 5 CNTCT SOCKET IN LINE 5 CNTCT NOT SHOWN gt gt THESE RESISTORS ARE PART OF THE RMS 5 22 SENSOR KIT AND MAY BE OBTAINED WITH THE SENSOR BY ORDERING PART 489377 SEE SECTION 4 RMS SENSOR REPLACEMENT 8920A 8921A FLUKE STOCK NO 261859 348276 348276 219022 219022 474445 474437 223529 289553 148023 458299 261669 268813 309674 235002 234708 261669 458299 246223 246223 235226 327569 322645 289454 218032 291617 168229 275685 489377 357830 418566 418566 248906 277236 277236 330829 110726 417899 417899 417899 417899 MFG SPLY CODE 01121 01121 01121 01121 01121 91637 91637 91637 91637 01121 89536 91637 91637 89536 91637 91637 91637 89536 91637 91637 91637 89536 91637 91637 01121 91637
25. 221127 FLX 952 24494 Peru e Importaciones y Representaciones Electronicas S A Avda Franklin D Roosevelt 105 Lima 1 Peru 7 Tet 14 26 8650 TLX 394 25663 Philippines Republic of e Spark Radio amp Electronics Inc 452 Shaw Boulevard Mandaluyong Metro Manila Republic of Philippines Tei 2 775192 TLX 722 or 732 27901 Poland Amtest Associates Ltd Ciarence House 31 Clarence St Staines Middlesex TW18 45 England Tet 7841 63555 TLX 851 928855 Portugal a Decada Equipamentos de Electronica Ay Bomberos Voluntarios Lote 1028 Mirafiores Aiges 1495 Lisbon Portugal Tei 1 2103420 TLX 832 15515 Romania e Amtest Associates Ltd Ciarence House 31 Clarence St Staines Middlesex TW18 45 England 784 63555 TLX 851 928855 Saudi Arsbis Electronic Equipment Markehng Co PO Box 3750 Riyadh Saud Arabia Tei 1 477 1650 TLX 201120 Singapore Republic of Rank O Connor s PTE Ltd O Connor House 98 Panjang Road Singapore 0511 Republic ot Singapore Tel 4737944 TLX 786 RS21023 South Africa Fiuke S A Pty Ltd Wynberg Park 777 Street Wynberg South Africa Tei 11 786 3170 TLX 960 424328 Spain s ESSA Quipos y Sistemas 5 A C Apolomo Morales 13 8 Magno 16 Spain Tet 1 458 0150 TLX 831 42856 Sei Lanka Computertink Data Systems Ltd 294 Union Place Colombe 2 Sn Lanka
26. 8921A 003 Available in both Counter Output Ounter Output 3920A amp 8921A Logarithmic Analog Output Available in 8920A only 1 1 8920A 8921A Table 1 2 8920A 8921A Accessories for C size instruments ACCESSORY MODEL NO DESCRIPTION Rack Mounting Kit single unit Rack Mounting Kit double unit Panel Adapter DIN size 1 8 The PTI Portable Test Instrument case is family of injection molded plastic instrument packages of various sizes which may be stacked vertically and latched together to form portable test stations When instruments are stacked they should be limited to 40 pounds total and the instrument drawing the most power should be on the top Stacked instruments have a horizontal air space between them to reduce heat conduction between instruments 1 9 SPECIFICATIONS 1 10 Detailed specifications for the Models 8920A and 8921A True RMS Voltmeter are given in Table 1 3 1 11 Specifications Options 1 12 Detailed specifications for the Models 8920 and 8921A s options are given in Table 1 4 Table 1 3 8920A 89214A Specifications ELECTRICAL Basic and a minimum 90 day calibration cycle FUNCTIONS DISPLAY RANGING AUTORANGING POINTS MAXIMUM INPUT RESPONSE TYPE RESPONSE TIME INPUT IMPEDANCE CREST FACTOR FREQUENCY RANGE ELECTRICAL VOLTS Display Mode RANGES RESOLUTION 1 2 8920A 8921A The electrica
27. CA 91504 213 849 7181 irvine 92713 0676 16969 Von Karman Suite 100 Irvine CA 92714 714 863 9031 San Diego John Fiuke Mfg inc 4540 Kearny Villa Road Suite 115 San Diego CA 92123 619 292 7656 Santa Clara John Fluke Mig Inc 2300 Walsh Ave Bldg Santa Ciara CA 95051 408 727 0513 CO Denver John Fluke Mtg Co Inc 14180 E Evans Ave Aurora CO 80014 303 695 1000 CT Hartford John Mfg Co inc Glen Lochen East 41 C New London Turnpike Glastonbury CT 06033 203 659 3541 FL Clearwater 813 799 0087 Oriande John Fluke Mfg Co ine 940 N Fern Creek Ave Orlando FL 32803 305 896 4881 Tampa 813 251 9211 GA Atlanta John Fluke Mfg Co Inc 2600 Road Suite 150 Marietta GA 30067 404 953 4747 IL Chicago John Mfg Co Inc 1150 W Euclid Avenue Palatine IL 60067 312 398 0850 312 392 9510 indianapolis John Fluke Mfg Co Inc 8777 Purdue Road Suite 101 Indianapolis IN 46268 317 875 7870 MA Billerica John Fluke Mfg Inc 900 Middlesex Turnpike Building 8 Billerica MA 01821 617 663 2400 MD Baltimore 301 792 7060 Rockville John Fluke Co Inc 5640 Fishers Lane Rockville MD 20852 301 770 1570 Detroit John Fluke Mfg Inc 33031 Schoolcraft Livonia Mi 48150 313 522 9140 MN Bioomington John Fluke Mfg Co inc 1801 E 79t
28. Lexington Massachusetts 50088 Mostek Corp Carrollton Texas 50579 Litronix inc Cupertino California 51605 Scientific Components tnc Linden New Jersey 53021 Sangamo Electric Co Springfield 54294 Cutier Hammer Inc formerly A Cutter Hammer Co North Carolina 55026 Simpson Electric Co Div of Am Gage and Mach Elgin tiinois 56289 Sprague Electric Co North Adams Massachusetts 58474 Supenor Electric Co Bristol Connecticut 60399 Torn Corp formerly Torrington Mfg Co Torrington Connecticut 63743 Ward Leonard Electric Co Inc Mount Vernon New York 64834 West Mig Co San Francisco California 65092 Weston Instruments inc Newark New Jersey 66150 Winslow Teie Tronics Inc Eaton Town New Jersey 70485 Atlantic india Rubber Works Chicago 70563 Amperite Company Union City New Jersey 70903 Beiden Corp Geneva Illinois 71002 Birnback Radio Co inc Creeport New York 71400 Bussmann Mfg Div of McGraw Edison Co Saint Louis Missouri 71450 CTS Corp Elkhart indiana 71468 ITF Cannon Electric inc Santa Ana California 71482 Clare C P amp Co Chicago Hlinois 71590 Centreiab Electronics Div of Globe Union inc Milwaukee Wisconsin 71707 Coto Inc Providence Rhode island 71744 Chicago Miniature Lamp Works Chicago tlinois 71785 TRW Electronics Compo
29. 114448 REF CR4O3 DIODE SI HI SPEED SWITCH 203323 07940 118848 REF CR1hOL DIODE SI HI SPEED SWITCH 203323 07940 114448 REF CRHOS DIODE SI HI SPEED SWITCH 203323 07940 1 4448 REF DIODE SI HI SPEED SWITCH 203323 07940 1N4448 REF DIODE SI HI SPEED SWITCH 203323 07980 18 REF H1 SCREW 4 40 X 1 4 SST 256156 73734 23022 2 I gt J402 CONN BNC FEMALE 152033 95712 30355 1 1 L401 CHOKE 6 TURN 320911 89536 320911 3 CHOKE 6 TURN 320911 89536 320911 REF 1403 CHOKE 6 TURN 320911 89536 320911 REF LH Ol INDUCTOR SHEILDED 0 27UH 313031 24859 0 27 1 MP1 SHIEL 475491 89536 475491 1 2 SHIELD 475483 89536 475483 1 SHIELD 475376 89536 475376 COVER 475509 89536 475509 MPE COVER 475400 89536 475400 MP9 BUS WIRE 20 115469 89536 115469 MP 10 BRACKET 456723 89536 456723 IA LA oA SHIELD 475384 89536 475384 1 P106 POST CONTACT 474809 22526 65505 136 3 P401 CABLE 003 OPTION 486670 89536 486670 1 0401 XSTR DUAL FET 455637 89536 154637 1 0402 XTSR SI NPN 272237 89536 212231 2 9803 XTSR SI NPN 272237 89536 272237 REF R402 RES MF 1K 11 1 8W 168229 91637 CMF551001F 2 R403 RES MF 1K 11 1 8W 168229 391637 551001 REF R404 RES VAR 100 10 1 2W 369520 89536 369520 1 R405 RES COMP 20K 5 1 221628 01121 CB2035 1 RES COMP 9 1K 5 1 4W 193318 01121 9125 2407 51 5 1 221879 01121 CB5105 8808 RES
30. 75 35 CAP ELECT 220 UF 10 75 35V CAP ELECT 220 UF 10 4752 35V CAP ELECT 5700 UF 10 100 15 CAP CER 10 000 PF 20 1007 DIODE MULTI PELLET DIODE HI SPEED SW DIODE HI SPEED SW DIODE HI SPEED SW RECTIFIER BRIDGE RECTIFIER BRIDGE DIODE HI SPEED SW DIODE HI SPEED SW FUSE SLO BLO SCREW ST RHP 4 40 X 1 4 WASHER LOCK STEEL F 4 NUT 4 40 HEX STEEL SCREW PHP 4 40 X 5 16 NOT SHOWN SCREW PHP 4 amp 40 X 5 16 NOT SHOWN NUT HEX DBL CHMF NOT SHOWN NUT HEX DBL CHMF NOT SHOWN CONNECTOR BANANA JACK GREEN CONNECTOR BANANA JACK BLACK CONNECTOR BANANA JACK RED BLANK JACK BANANA BLACK BLANK JACK BANANA BLACK SOCKET IN LINE SOCKET IN LINE SOCKET IN LINE CONN AC PWR CONN MATING POST CNTACT POST CNTACT POST CNTACT CHOKE 6 TURN CHOKE RF METER ANALOG PANEL BRACKET SWITCH MOUNTING BRACKET METER MOUNTING BRACKET PUSH ROD FLUKE STOCK NO ORDER ORDER 446807 161349 148478 436113 149153 149153 148429 161786 460279 460279 460279 460261 149153 375477 203323 203323 203323 296509 296509 203323 203323 166488 256156 110395 184044 152116 152116 110635 110635 479329 162073 162065 484329 484329 436774 436774 436774 461806 461095 417329 474213 478693 329911 186288 478685 475392 468868 456749 MFG SPLY CODE MODEL MODEL 89536 56289 72136 73445 56289 56289 12136 72136 89536 89536 89536 80031 56289 09214 07910 0791
31. 8921A Final Assembly moscas et kk Eg xor 5 1 A 8920A Main PCB Assembly 5 2 Al 8921A Main PCB Assembly ciate cee 5 3 AUAT Display PT B Assembly aer e WON wa 5 4 A2 8920A 8921 AC PCB Assembly 5 5 PAGE 5 3 5 5 5 11 5 17 5 18 Section 5 List of Replaceable Parts FIGURE 5 1 5 2 5 3 5 4 5 5 PAGE 5 4 5 9 5 15 5 17 5 24 8920A 8921A 5 1 INTRODUCTION 5 2 This section contains an illustrated parts breakdown of the instrument 8920A 8921A Components are listed alpha numerically by assembly Electrical components are listed by reference designation and mechanical components by item number Each listed part is shown in an accompanying illustration 5 3 Parts lists include the following information 1 Reference Designation or ltem number 2 Description of each part 3 Fluke Stock number 4 Manufacturer s part number or type 5 Total quantity per assembly or component 6 Recommended quantity this indicates the recommended number of spare parts necessary to support one to five instruments for a period of two years This list presumes an availability of common electronic parts at the maintenance site For maintenance for one year or more at an isolated site it is recommended that at least one of each assembly in the instrument be st
32. Analog Output Option is operating within the specilication limits stated in Section 1 Select the AC function LO RANGE ENABLE and AUTO range on the 8920 2 Apply 1 0 500 Hz to the 89204 INPUT connector 3 Select the DC Volts function and 2 Volt range on the DVM connect it to the LOGARITHMIC ANALOG OUTPUT jacks on the rear panel of the 8920 4 Adjust the vernier control on the AC source of voltage reading on the DVM of 1 400 2 002 V dc 5 Press the 8920 dB VOLTS switch to the dB posiuon then the REL dBm switch to the REL position The 8920A display will be 0 00 dB 6 Select the 20 volt range on the DV M 7 Use the decade switch on the ac source to increase the 8920A input to the levels indicated in Table 604 1 Note the DVM and 8920A displays to b within the tolerances given Table 604 1 Performance Test 8920A INPUT 8920 DISPLAY DVM DISPLAY 10 mV 500 Hz 20 00 0 25 dB 3 4 0 24 100 mV 500 Hz 40 00 20 25 dB 5 4 0 24 1V 500 Hz 60 00 50 25 dB 7 4 0 24 10V 500 Hz 80 00 0 25 dB 9 4 50 24 100V 500 Hz 100 00 20 25 dB 11 4 0 24 The tolerance limit represents total system inaccuracies 604 15 Calibration 604 16 The Logarithmic Analog Option should be calibrated when it is first installed or ifthe limits as stated in the performance test cannot be met Use the following procedure to calibrate the Logarithmic Analog Option If it is not possible to obtain the lim
33. COMP 1 2K 5 190371 01121 581225 R409 RES COMP 15K 5 1 4W 148114 01121 1535 R4 10 RES COMP 220 5 1 NW 147959 01121 CB2215 A e A 603 9 8920A 8921A 603 10 Tabie 603 5 Counter Output Option PCB Assembly cont DESCRIPTION RES COMP 47 5 1 4 RES COMP 680 54 1 hW RES COMP 470 4 51 1 HW RES COMP 5 1K 5 1 4W RES COMP 1K 5 1 4 RES COMP 680 5 1 4W RES COMP 51 4 5 1 4W TRANSFORMER TRANSFORMER IC LIN HI SPEED ANALOG VOL COMPARTOR IC LIN HI SPEED ANALOG VOL COMPARATOR gt Refer to Figure 603 1 147892 148007 147983 193342 148023 148007 221879 461863 472798 386920 386920 MFG PART NO TYPE CB18705 CB6815 CB4715 CB5125 CB1025 CB6815 CB5 105 461864 472498 LM361N LM361N Figure 603 6 Counter Output Option PCB Assembly 8920A 8921A TOT REC QTY 604 1 INTRODUCTION 604 2 The Logarithmic Analog Output Option provides a non isolated output voltage which varies continuously as the logarithm of the rms input Scaling is OV dc output corresponds to 0 dB which is 200 uV rms input to the 8920A while 13 1V dc output 131 dB 700V rms input A continuous frequency response of circuits with a wide dvmnamic output is easily plotted on an XY recorder using this option The option s output is non isolated and is available only on the 8920A 604 3 SPECIFICATIONS 60
34. Chassis Ground 5 3 0 3V 6 5 9401 6 and Chassis Ground 6 5 0 3 2 Using an oscilloscope with x10 probe Tek 475 or equivalent check the following points for the indicated SCOPE DISPLAY 2V DIV 10 us DIV 2V DIV 10 us DIV Ei Table 603 4 Counter Output Option Troubleshooting cont 2a Using Fluke 5200A or equivalent apply 1V 10 kHz signal to input of UUT SCOPE DISPLAY MEASURE BETWEEN HIGH TERMINAL LOW TERMINAL Gate of Q401A and input Common Drain of Q4018 and Input U401 3 and Input Common U401 4 and input Common U401 9 and Input 1401 input and Input Common 2 DIV 10 us DIV 2V DIV 10 us DIV 60 mV DIV 10 ps DIV 1V DIV 10 us DIV SVIDIV 10 us DIV 603 7 8920A 8921A Table 603 4 Counter Output Option Troubleshooting cont MEASURE BETWEEN HIGH TERMINAL LOW TERMINAL SCOPE DISPLAY 7401 output and Chassis Ground 5V DIV 10 us DIV U402 4 and Chassis Ground 0 5V DIV 10 ps DIV E 0402 9 and Chassis Ground 0 2V DIV 10 us DIV J402 and Chassis Ground 9 100 mV DIV 10 us DIV input Common v see schematic at end of this manual Section 8 Chassis Ground see schematic at end of this manual Section 8 5 Press the 8920A dB VOLTS switch to the dB position then the REL dBm switch to the
35. Corp Kokomo Indiana 17001 Replaced by 71468 17069 Circuit Structures Lab Burbank California 17338 High Pressure Eng Co Inc Oklahoma City Oklahoma 17545 Atlantic Semiconductors inc Asbury Park New Jersey 17856 Siliconix Inc Santa Clara California 17870 Replaced by 14140 18178 Vactec inc Maryland Heights Missouri 18324 Signetics Corp Sunnyvale California 18612 Vishay Resistor Products Div Vishay Intertechnology inc Malvern Pennsylvania 18736 Voitronics Corp Hanover New Jersey 18927 Syivania Inc Precision Material Group Parts Division Titusvitie Pennsylvania 19451 Perine Machinery amp Supply Co Seattle Washington 19701 Electro Midland Corp Mepco Eiectra Inc Mineral Wells Texas 20584 Enochs Mfg Inc Indianapolis indiana 90201 Mallory Capacitor Co Div of P R Mallory Co Inc Indianapolis Indiana 90211 Use 56365 Square D Co Chicago Hlinois 90215 Best Stamp amp Mfg Co Kansas City Missouri 90303 Maliory Battery Co Div of Mallory Co Inc Tarrytown New York 91094 Essex International Inc Suglex IWP Div Newmarket New Hampshire 91293 Johanson Mfg Co Boonton New Jersey 91407 Replaced by 58474 91502 Associated Machine Santa Clara California 91506 Augat Inc Attieboro Massachusetts 91637 Dale Electronics inc Columbus Nebraska 91662 Elco Corp Willow Grove
36. Figure 5 4 A1A1 Display PCB Assembly 5 17 8920A 8921A ITEM DESCRIPTION Table 5 5 A2 8920A 8921A AC PCB Assembly ASSY 20A 21A 4003T FIG 5 5 C1 CAP FIXED 0 022UF 10 630 C2 CAP PORC 180PF 5 1KV C3 CAP PORC 4 3PF 0 25PF 1 7KV CAP CER 510PF 5 100V C5 CAP VAR 1 5 0 25PF 2000V C6 CAP CER 39PF 5 100V CT CAP CER 5100PF 5 100 5 5 18 3507 C9 1 7 6 250 C12 CAP CER 10 000 20 100V C13 CAP VAR 1 5 0 25PF 2000V C114 CAP MINI CER 1 8PF 0 25PF 100V C15 CAP CER 50000PF 20 480 25V C16 100 20 20V C17 10 000 20 1007 C18 CAP TA 1 0UF 20 354 C19 CAP CER 10 000 204 100V C20 CAP TA 10UF 20 20V C22 CAP MINI CER 33PF 24 100 C23 CAP MINI CER 100PF 21 100V c24 10UF 20 20V c25 CER 10 000 20 100 C26 CAP MINI CER 6BPF 2 100V C28 CAP TA 10UF 204 20V C29 CAP TA 10UF 20 20V C31 CAP CER 22UF 20 50V C33 CAP VAR 1 5 0 25PF 2000 C34 CAP TA 10UF 20 20V C35 CAP CER 50000PF 20 804 25V C36 10 000 20 100V C31 CAP MINI CER 33PF 2 100V C39 CAP TA 10UF 20 20V CHO CAP TA 100 20 20V C4 1 10 000 20 100 c42 CAP TA 10UF 20 20V 100 20 20V C45 CAP TA 39UF 20 20V C48 CAP TA 39UF 20 20 C49 CAP CER 1000PF 10 500V C50 CAP CER 10
37. Maiaysia SON BHD Tet 743422 TLX 784 7 764 Mexico industrial S A Mexel Diagonal No 27 Entre Calle Eugenia Y Ave Colonia dei Valle C P 03100 Mexico Tei 660 4323 TLX 383 1771038 Netheriands Tlburg Fiuke Nederland B V Tet 352455 844 52683 New Zealand Auckiand McLean information Technology Ltd Tet 501 801 501 219 791 21570 Norway Oslo Morgenstieme amp Co A S 356110 856 71719 Pakistan Karachi international Operations Ltd Tet 221127 239052 952 24434 Peru Lima Importaciones Y Representaciones Eiectronicas S A Tel 288650 TLX 394 25663 Philippines Republic of Spark Radio Eiectronics Corp Tel 775192 TLX 722 27901 Portugal Lisbon Decada Equipamentos de Electronica Tel 2103420 TLX 832 15515 Republic of Singapora Singapore Rank O Connor s PTE Limited Tei 4737944 TLX 786 RS21023 Rputlic cf South Africa S A Pty Ltd Tet 786 3170 TLX 660 424328 Spain Madrid Equipos y Sistemas S A Tel 458 0150 TLX 831 42856 Sweden Vallingby Teleinstniment Tel 380370 TLX 854 15770 Switzeriand Zurich Traco Electronic AG Tel 2010711 TLX 845 815570 Taiwan Schmidt Electronics Corp Tel 5013468 TLX 785 11111 Thailand Bangkok Measuretronix Ltd Tel 378 2516 TLX 788 82796 Turkey Istanbul Erkman Elekt
38. NO DESCRIPTION R230 RES COMP 1M 4 54 1 8 R231 RES MTLFLM 11 8K 0 254 1 8W R232 RES MTLFLM 11 8K 0 251 1 8W R234 RES VAR CER 100K 10 1 2W R235 RES MTLFLM 110K 1 1 8W R236 RES COMP 82K 5 1 4W R237 RES COMP 100K 5 1 4W R238 RES MTLFLM 100K 1 1 8W R239 RES COMP 150 51 1 uW R240 RES COMP 1M 5 1 4W R244 RES COMP 1M 5 1 4W S201 1 BUTTON RANGE S201 206 SWITCH SET 5202 1 BUTTON FUNCTION S203 1 BUTTON FUNCTION S204 1 BUTTON FUNCTION 5205 1 BUTTON RANGE S206 1 BUTTON RANGE 5207 SWITCH ROTARY S208 SWITCH POWER S208 1 BUTTON SWITCH GREEN 5209 SWITCH SLIDE S210 SWITCH SLIDE 1200 POWER TRANSFORMER U200 Q IC C MOS QUAD BI LATERAL SW U201 IC LIN U202 LIN 5 XSTR ARRAY 2 PNP 3NPN 0203 Q IC C MOS HEX BUFFER 0204 Q IC C MOS QUAD 2 INPUT NAND U205 8920 CUSTOM LSI U206 IC LIN NPN XSTR ARRAY U207 Q IC C MOS HEX BUFFER U209 Q IC C MOS HEX INVERTER U210 IC LIN OP AMP U211 IC LIN OP AMP VR201 DIODE ZENER 6 4V VR202 IC LIN ADJ REG VR203 IC LINEAR VOL REG VR204 DIODE ZENER Wi WIRE ASSY FRONT PANEL W2 WIRE ASSY FRONT PANEL W5 WIRE ASSY FRONT PANEL 6 WIRE ASSY FUSE WT WIRE ASSY FUSE W10 GROUND STRAP ASSY BRIDGE RECTIFIER Wil WIRE ASSY BRIDGE RECTIFIER W201 WIRE ASSY JUMPER XF1 HOLDER FUSE 1 1 FUSEBOLDER CAP GREY 1 4 X 1 174 XR204 SOCKET RESISTOR FLUKE STOCK NO 182204 325688 325688 369520 234708 188458 148189 248807 187934
39. Q206 XSTR SI NPN Q207 XSTR SI PNP PWR Q208 XSTR FET GRP N CHANNEL Q209 XSTR FET GRP N CHANNEL R200 RES COMP 100K 5 1 4W R201 RES MTLFLM 2 15K 11 1 8W R202 RES MTLFLM 301K 1 1 8w R203 RES COMP 1M 51 1 W R205 RES VAR CER 10K 10 1 2W R206 RES MTLFLM 499K 1 1 8 R207 RES MTLFLM 47 5K 1 1 8W R208 RES COMP 10K 51 1 W R209 RES COMP 68K 54 1 4W R2 10 RES COMP 150 5 1 4W R212 RES COMP 22K 5 1 43 R213 RES COMP 10K 4 51 1 lw R2 14 RES COMP 330K 5 1 4W R215 RES COMP 10K 5 1 NW R216 RES COMP 6 8K 5 1 4 R217 RES COMP 22K 5 1 4W R218 RES COMP 100K 5 1 4W R219 RES COMP 1K 5 1 W R220 RES COMP 20K 5 1 4W R221 RES COMP 20K 5 1 4W R222 RES COMP 1K 4 5 1 4W R223 RES COMP 20K 5 1 4W R224 RES VAR CER 10K 10 1 2W R225 RES MTLFLM 90 9K 1 1 8W R226 RES MTLFLM 953 1 1 8W 5 12 8920A 8921A 463224 467696 467704 456756 456731 475681 464404 467548 483107 473546 473611 473173 473652 454702 407502 340026 340026 340026 340026 340026 218396 218396 325753 261388 261388 148189 293712 379156 182204 309674 389191 474585 148106 148171 147934 148130 148106 192948 148106 148098 148130 148189 148023 221614 221614 148023 221614 309674 223537 288555 MFG SPLY CODE 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 895
40. Q29 32 K2 04 05 029 031 Refer the schematics in Section B 3 4 8920 8921 15V 15V F RANGING Vac y D 1V RMS E FULL SCALE m INPUT FROM AMP A FEEDBACK NETWORK X11 _ INTE SQUARE ROOT GRATOR FULL SCALE OUTPUT TO A D CONVERTER Figure 3 4 RMS Converter 3 22 For the following discussion refer to Figure 3 5 the A D Converter Simplified Schematic and Timing Diagram and Figure 3 6 Controller Timing A D Converter 3 23 At the beginning of the measurement cycle INT goes high and the dc output of therms sensor is applied to the A D integrator for 100 msec C203 charges up from the auto zero level at a rate proportional to the applied input voltage and thecomparator s output CM is driven low At the end of the 100 msec integrate period goes high applying the reference voltage to the integrator The integrator then discharges at a rate which is constant for all on scale inputs and the controller begins counting clock pulses When C203 has discharged to the auto zero level CM will go high the controller will stop counting and the reading is displayed AZ then begins allowing the A D Converter circuitry to settle before the next read cycle If CM has not occurred before the end of the 200 msec maximum DE period the input will have exceeded the present range In this case the DE period wil
41. REL position The 8920A display will be 20 00 dB 6 Select the 20 volt range on the DVM 7 Use the decade switch on the ac source to increase the 8920A input ot the levels indicated in Table 604 1 Note the DVM and 8920A displays to be within the tolerances given m 603 8 8920A 8921A Table 603 5 Counter Output Option PCB Assembly FLUKE MFG ITEM MFG PART NO TOT REC NO DESCRIPTION E OR TYPE OTY QTY COUNTER OUTPUT OPTION ORDER OPTION 1 CHO CAP CER 0 22UF 309849 71590 CW30C22U1K 5 Choe CAP CER 4 5 500V 177980 72136 DM15Fl31J 1 C403 CAP CER 0 22UF 309849 71590 CW30C2241K REF C404 CER 0 22UF 309849 71590 CW30C2241K REF 20 20 348516 56289 196D476x0020TE4 1 C407 0 0050 20 100V 175232 56289 023 101 502 1 C408 CAP CER 0 22UF 309849 71590 CW30C22H1K REF C409 CAP CER O 01UF 20 1007 149153 56289 023 101 103 1 C410 CAP CER 0 22UF 309849 71590 CW30C2241K REF CAP TA 220UF 20 10 474288 56289 1960227 0010 2 C412 CAP TA 220UF 201 10V 474288 56289 1960227 0010 REF CB 13 CAP CER amp 7UF 204 50V 363721 56289 1960 475 0050 2 C444 CER 4 7UF 20 50V 363721 56289 1960475 0050 REF C415 CAP CER 300PF 3KV 485250 56289 028 02 301 1 DIODE SI HI SPEED SWITCH 203323 07940 1N4u48 7 2 CR5S02 DIODE SI HI SPEED SWITCH 203323 07940
42. Range Codes EA asa a 3 9 3 4 Over Underigad Conditions esxieskrencesw crei etude 3 9 3 5 Range Codes es dso Saa A SARE aa 3 9 4 Recommended Test Equipment eee ee Vos 4 2 422 input Power Selection ER RED AES SERERE 4 2 4 3 Low and Midband Performance Check Volts Display Mode 4 4 4 4 GB Display Mode Check SOLAS Ea Rak 4 6 4 5 DE Low Lese Check quot ede Ww riore D A nt 4 7 4 6 High Frequency Response Check _ 4 10 4 7 Low and Midband Accuracy Adjustments SES 411 4 8 High Frequency Calibration Vira Pa iis 4 13 4 9 8920A 8921A Troubleshooting Procedure 4 16 4 10 Attenuator States edt oe 4 19 4 11 R204 Resistive Values mF LIC BW 4 20 4 12 R19 R34 R66 R76 Resistive Values mF I 4 20 603 1 Recommended Test Equipment eru AE eoe Re Veg 603 2 603 2 Counter Output Anipl tude ul rere l des pred ate pcan 603 5 603 3 Counter Output Frequency Response oda Von A 6
43. Republic ol Instrii 2ax Service Cent Tel 6 261 Sistemas inetrumentacion Ltda Tet 29 42 TLX 396 4578 Toon Tage Tei 658111 TLX 855 35293 Protecc Cogan Cie Tet 526758 TLX 393 2865 Egypt and Sudan Electron Engineering Liaison Offic Tet 695705 TLX 927 22782 England Wattord Herts fluke Great LTD Tel 40511 TEX 934583 Fund instrumentanum Eiektronikkg Tei 358 0 5281 TEX 857 124426 France Electronique 525 Tei 8568131 TEX 842 695414 Greece Atham Hellenic Representations Ter 7211142 Ti X 883 21030 dise Muay amp Zo Eta TR 8330 222 TEX 780 74766 TECHNICA SERVICE CENTERS india Bangalore Hinditron Services Pvt 552 Tel 33139 TLX 853 845741 india Bombay Hinditron Services Pvt Ltd Tei 8121316 TLX 953 112326 india New Delhi Hinditron Services Ltd Tet 640380 TLX 953 316458 indonesia Jakarta Pusat Dwi Tunggal Jaya Sakti Tat 584685 TLX 796 47306 Ramat Hasharon Electronics Engineering Ltd Tet 483211 FLX 822 32143 italy Milan Sistrel S p A Tet 6181893 TLX 843 334643 Japan Tokyo John Fiuke Mfg Co inc Japan Branch Tel 434 0181 781 242 4331 Korea Republic of Elactro Science Korea Co Tet 784 0942 MYOUNG 24283 Malaysia Petaling Jaya Mecomb
44. SP7755 333898 SP7755 SP7755 218081 229898 218081 229898 316475 261578 261578 261578 376475 REF REF REF REF REF REF REF REF 10 REF REF REF REF REF REF REF REF REF REF REF 3 REF REF REF TOT REC N W 5 19 8920A 8921A Table 5 5 A2 8920A 8921A PCB Assembly cont FLUKE MFG ITEM MFG PART ND TOT Ber NO DESCRIPTION Mis Fine OR TYPE lary Q33 XSTR FET JCT N CHANNEL 376475 89536 376475 REF 936 XSTR SI PNP 453829 24355 821 REF Q37 DUAL FET RESISTOR SET 476788 89536 476788 REF Q38 XSTR MATCHED SET 463133 89536 563133 REF Q39 XSTR SI PNP 454066 04713 5 7755 REF Q40 XSTR MATCHED SET 463133 89536 463133 REF 981 XSTR SI NPN 333898 89536 333898 REF 042 XSTR SI PNP 225599 12040 PN4250 REF 083 XSTR SI PNP 454066 04713 5 7755 REF QUA XSTR SI NPN 333898 89536 333898 REF 045 XSTR SI PNP 454066 04713 SPT755 REF 057 XSTR SI NPN 333898 89536 333898 REF Q48 XSTR SI PNP 454066 04713 5 7755 REF 049 XSTR SI PNP 554066 04713 SPT7755 REF 950 XSTR SI NPN 218081 89536 218081 REF 051 XSTR SI PNP 229898 89536 229898 REF Q52 XSTR SI NPN 218081 89536 218081 REF Q53 XSTR SI PNP 229898 89536 229898 REF Q55 XSTR SI NPN 330803 89536 330803 1 1 Q56 XSTR SI PNP 418707 07910 56562 1 1 R1 RES MF IM 1 1 2W 161075 91637 CMF651004F 1 R2 RES FXD 9 91M 1 1
45. also applied to the LINEAR ANALOG OUTPUT terminals on the rear panel of the 8920A as well as the analog meter on the front panel of the 8920A and 8921A 3 9 The last analog circuit we discuss in this section is the Power Supply This circuit provides three regulated power supplies FSV 15V and 15V to operate the instrument 3 10 Digital Circuitry 3 11 The digital circuitry comprises the A D Converter the Controller and the Display Together these circuits develop a digital representation of the rms vaiue of the input signal produce the commands that set the range and function of the instrument and finally display the input value 4 12 The dc output of the RMS Converter is translated to a digital representation by the D Converter The digital representation is then processed by the controller to obtain a BCD output which is proportional to the desired display mode VOLTS dB dBm REL The BCD output is decoded and applied to the display for visual inspection 3 13 DETAILED BLOCK DIAGRAM DESCRIPTION 3 14 In the following paragraphs we discuss in detail the individual functions within the major areas of circuitry in the 8920A and 8921A Each major circuit area is described in detail in Figure 3 2 The following paragraphs describe the functioning of these subordinate areas The description for each circuit is to its own functional block diagram or to the schematics in Section 8 39 15 Signal C
46. and overrange flashing digits indications are provided to indicate when a range change is necessary 2 46 AUTORANGE 2 47 The proper measurement range is automatically selected when the HOLD AUTO switch is in the AUTO out position If the LO RANGE ENABLE switch is depressed the meter will autorange up and down from the 2 mV range to the 700V range When LO RANGE ENABLE is not depressed the 2 mV range is deleted from the available ranges 2 6 8920 8921 NOTE For the 2 m range to be selected RANGE ENABLE must he depressed and input signal level must he less than 2 ml Downranging occurs 180 digits and upranging occurs at 2000 digits 2 48 MANUAL 2 49 Manual range selection is accomplished bv sel cting a range using the autorange mode and then depressing the HOLD AUTO switch The meter willstay in that range regardless of input level changes If the range becomes invalid for a given input level an overrange or underrange indication will flash If an underrange is indicated select autorange AUTO and after the proper range is selected press HOLD For overrange conditions momentarily press the STEP UP switch once for each desired range increment Holding the switch in will increment the meter to the 700V range Select autorange AUTO to downrange 2 50 Voltage Display Mode 2 51 The 8920A 89214 will display a voltage input in one of two measurement units volts or dB To display the input vo
47. of the Integrator Feedback through the Square Root Amplifier provides a dc voltage to the RMS Sensor s output resistor such that a similar temperature rise occurs in the output resistor The sensor gain is not constant with changes in input amplitude These changes in gain are compensated for by the square root amplifier maintaining constant response time with changes in level 3 19 The rms sensor is susceptible to damage from overvoltage inputs During an overload condition the protection circuit will clamp the output of Amplifier Bto prevent damage to the sensor Overload conditions would result during turn on turn off or any time the rms value of the applied input exceeds the operating range of the sensor 3 20 A D Converter 3 21 dual slope integration technique is used in the Model 8920 8921 A D Converter This method applies the unknown voltage to a capacitor and allows the capacitor to charge for a specific time interval Atthe end of this interval the unknown voltage will be removed The charge on the capacitor at this time will be proportional to the level oftheunknown voltage Thena known voltage of opposite polarity is applied to the capacitor and clock pulses are counted while the capacitor discharges When the capacitor has reached its original charge point the number of clock pulses counted is a digital construction of the analog voltage input to the A D Converter 3 3 8920A
48. on Figure 3 7 This count approximates the logarithmic curve of the dB scale and like the VOLTS mode is stored in the data latches 3 35 dBm REFERENCE 3 36 Don tlet the m confuse you it simply means that the power level as measured in dB Computations is referenced to mW In other words when the instrument reads 0 dB the system being measured will be dissipating 1 mW of power The following will explain how the controller obtains a measurement of power referenced to mW dBm 3 37 In order for the controller to obtain a measurement in dBm parameters the appropriate reference impedance must be used A 1200 ohm reference impedance is assumed by the RM Therefore if any other reference is desired an appropriate constant must be added or subtracted from the count The dBm REFERENCE rotary switch connects one of the eight strobes to RD and J The controller responds by sending the appropriate constant to its ADD SUB 3 38 Referring to Figure 3 7 let s assume that a 600 ohm reference impedance is selected and the instrument had previously made a relative measurement Strobe zero 3 9 8920A 8921A will be applied to RD until the REL dBm switch is placed in its dBm position At this time strobe 4 corresponding to 600 ohms is applied to RD and causes the controller to select the 600 ohm reference impedance data This data along with the range and polarity data is then shifted tothe ADD SUB where it is combined with
49. that the DMM reads 4 00V 0 01V plus the offset noted in step 5 604 17 Troubleshooting 604 18 To troubleshoot the 004 Option read the theory of operation for this option and then check the actual voltage levels against those indicated on the 004 schematic located in Section 8 lf there are any discrepancies simply replace the defective component and repeat the performance test and calibration procedure 604 19 LIST OF REPLACEABLE PARTS 604 20 A list of replaceable parts for the Logarithmic Analog Output Option is given in Table 604 2 and shown in Figure 604 4 Refer to Section 5 of this manual for ordering information 1 3 i S a PERA REV 5 11 85 Section 7 General Information 7 This section of the manual contains generalized user information as well as supplemental information to the List of Replaceable Parts contained in Section 5 7 1 or amp cont d a dac dmm dvm ext F FET freq FSN gd Ge GHz gin gnd hd 7 2 ampere alternating current audio frequency analog to digital assembiy american wire gauge bel binary coded decimal Ceisius capacitor counterclockwise ceramic ceramic to metal seal Circuit centimeter common mode rejection ratio composition continue cathode ray tube clockwise digital to anatog digital to analog converter decibel direct current digital multimeter digital
50. the 2 mV range 2 a Connect the 50 ohm terminated attenuator output to the input of the UUT 2 b Switch the leveled generatortothe X1 and adjust the amplitude such that a steady reading of 10 00 mV is obtained on the UUT 2 c Switch the leveled generator to the X 1 setting allowing the UUT to range down to the 2 mV range 2 d Adjust R44 so that the display ofthe UUT reads the same error as noted in step 1 1 digit 2 e Depress the RANGE HOLD switch readjust the leveled generator for a reading of 1 900 1 digit and switch down to the X 01 setting The UUT s display reading should be from 0 190 to 0 192 after settling Table 4 7 Low and Midband Accuracy Adjustments READ LIMIT EE DISPLAY of READING 2V AC Select RANGE HOLD 0 1 2V Return to step 1 if R101 was readjusted Select AUTORANGE 2 5 dc 20V AC DC 0 25 Vdc 2V AC DC Return to step 2 if R26 was readjusted 100 mV 200 mV 1 8 mV 2mV Return to step 4 if R44 was readjusted Note reading 1 10 of reading 3 digits in step 3 10 digits 10 digits 5 digits 40 digits 100 00 5 digits 1 0000 5 digits Meter 8921A Mid scale only 8920A 8921A Table 4 7 Low and Midband Accuracy Adjustments cont 200V 50K C8 100 00 10 digits LIMIT of READING digits 5 digits 100 Return to step 10 if C8 was readjusted 10 mV 20 mV 500 Chk 10 000 20 digits
51. the High Frequency Response Check UUT operating properly Apply 1V ac to UUT in the 2V ac range Check appropriate display drivers Q200 Q204 Correct power supply test point voltages are as follows 206 15V TP207 5V TP205 power supply ground Is TP206 at 15V m aum cm 15 TP208 at 1 5V 15 TP207 at 5 V Power supply is operating properly Check voltage between TP201 and TP202 is the voltage 0 5V 510 Does null peak meter read approximately 1 4 scale Check A D Converter is it operating correctly Check TP200 is it at 6 4V Check the following for appropriate A D Converter waveforms U200 U202 U205 and TP203 Refer to Figure 4 8 Replace defective component Repeat Performance Tests and Calibration Check attenuator logic levels using Table 4 10 Are 1 and Q33 switching properly Check Amp A amp B Check Amp A amp B and attenuator network Remove AC PCB is TP206 at 15V now 8920A 8921A Table 4 9 8920A 8921A Troubleshooting Procedure cont STEP NO INSTRUCTION ves No GOTO Troubleshoot AC pcb assembly Remove AC pcb is TP208 at 15V Check VR203 U200 U202 0205 0206 U209 0210 U211 U4 and U302 Check TP3 15 voltage on at 0 5V 41096 Turn UUT off disconnect UUT from line power CAUTION To avoid damage to the RMS sensor steps 37 and 38 must be performed with multimeter whose output on the ohms function is no
52. the count referenced to 1200 ohms The resultant value is now equivalent to a dBm reading referenced to 600 ohms The range and polarity data is held in the reference latches until RD or J detect a strobe change or unless the instrument is turned off Switching to the VOLTS mode will not cause the data in the reference latches to be lost 3 39 RELATIVE REL REFERENCE 3 40 Relative reference measurements allow any voltage input to become the 0 dB point to which all subsequent voltage inputs are referenced The controller makes a relative reference computation much the same way it made a dBm computation However in the REL mode 0 dB no longer refers exclusively to 1 mW The following explains how the controller makes a relative reference measurement 3 41 the Figure 3 7 you can see that upon selection of the REL mode the reference impedance data line will be disabled However to make a relative reference measurement the controller must use an initial reading and to obtain an initial reading it must use a 8920A CONTROLLER BUFFERS us reference impedance Therefore before the REL mode can be selected the controller must be allowed to make at least one complete measurement while in the dBm mode Once the measurement has been completed the REL mode may be selected The reading will now be fed back to the reference latches and held The controller will subtract the reading in the reference latches from all subse
53. to the 20 mV range AC AUTORANGE AG AUTORANGE 4 4 8920A 8921A Table 4 3 Low and Midband Performance Check Volts Display Mode cont FUNCTION AC AUTORANGE AC AUTORANGE AUTORANGE 4 19 DC Low Level Check 4 20 This procedure will verify correct operation with low level DC inputs Set up the test equipment as shown in Figure 4 2 and select the required function range and input signal as indicated in Table 4 5 Note any deviation between the display of the UUT and the specified limits 4 21 AC Low Level Check 4 22 This procedure will verify that the UUT s low level AC performance meets the specifications of Section 1 Set up the test equipment as shown in Figure 4 3 and complete the AC Low Level Calibration procedure Replace steps 2 d and 2 e with the following 2 4 Note that the UUT s display reads the same error as noted in step 1 38 digits 2 e Note that the UUT s display reads 0 1900 24 digits 4 23 High Frequency Response Check 4 24 This procedure will verify that the UUT s high frequency response meets the specifications of Section 1 Set up the test equipment as shown in Figure 4 4 and select the required input amplitude and frequency as indicated in Table 4 6 Note any discrepancies between the display reading and the limits given 4 25 CALIBRATION 4 26 Under normal conditions the 8920A and 8921A should be ca
54. voltmeter eiectrolytic external farad Fahrenheit Fieid effect transistor tip flop requency federal stock number gram g ga 10 guard germanium g gahertz guaranteed minimum value ground henry heavy duty List of Abbreviations and Symbois ht Hz if in intl yo kHz kV LED LSB LSD mA max mm ms MSB MSD MTBF MTTR MO na NC or neg NO ampi para pF high frequency hertz integrated circuit intermediate frequency inchies internal input output kilo 105 kilohertz kilohm s kilovolt s iow frequency light emitting diode least significant bit least significant digit mega 10 miti 1077 miiiampere s maximum metai fiim megahertz minimum millimeter muiittisecond most significant bit most significant digit mean time between failures mean time to repair mithivoltis muitivibrator megohm s nano 10 not applicable normaily closed negative normaliy open nanosecond operational amplifier pico 107 paragraph printed circuit board picofarad part number or pos pot PROM RAM ROM sec scope SH Si semo ic texo tp uoryu uht us or us uut v v var vco vhf vif xtmr xstr xtio positive potentiometer peak to peak parts per million programmablie read oniy memory pound force per square inch random access memory radio freque
55. with earlier pcb configurations To identify the configuration of the pcb s used in your instru ment ref t to the revision letter marked in ink on the component side of each pcb assembly Table 7A 1 defines the assembly revision levels documented in this manual with an X ud Appendix 7A Manual Change Information 4 NEWER INSTRUMENTS 5 changes and improvements are made to the instrument they are identified by incrementing the revision letter marked on the affected pcb assembly These changes are documented on a supplemental change errata sheet which when applicable is inserted at the front of the manual OLDER INSTRUMENTS To backdate this manual to conform with earlier assembly revision levels perform the changes indicated in Table 7A Table 7A 1 Manual Status and Backdating Information Assembly Ps Name Main PCB Assembly 8920A 4001 Main PCB Assembly 89214 4011 To adapt manual to earlier rev configurations perform changes in order by ar se with CIEN IT TT T T regem jeunes e pm ev X The PCB revision teveis documented this manual These revision letters were never usei in the instrument No revision letter on the 1 i 8920A 8921A mr CHANGE 1 ECO 11698 1 On Table 5 2 A1 8920A Main PCB Assembly delete the following items XF
56. 0 07910 21845 21845 07910 07910 71400 73734 73738 73734 73734 73734 73738 1313 74970 74970 14970 89536 89536 60065 60065 60065 89536 00779 22526 22526 22526 89536 12259 32171 89536 89536 89536 MFG PART NO OR TYPE 89214 89204 OR 89214 446807 196D47 53X0035HA1 DMF15151J C280MAH 220K CO23B10F 103M C023B10F103M DMF 194714 DMF19302J 460279 460279 460279 318375502 015 023 10 103 200 184448 IN4448 144448 F903C 22 F903C 22 198448 184448 MDL1 8 22022 1355 8002 19023 19023 8003 NP 8003 NP 479329 108 0903 001 108 0902 001 484329 485329 55 109 1 0 55 109 1 04 55 109 1 04 461806 87406 1 65500 104 65500 1081 65500 110 320911 WEE390 OMC DMA 001 CP2 475392 468868 456749 nk REF REF REF REF 3 5 11 8920 8921 Table 5 3 A1 8921A Main PCB Assembly cont EM DESCRIPTION NO MP205 KNOB SKIRTED MP206 SHIELD TRANSFORMER MP207 BRACKET FRONT PANEL MP208 PANEL REAR MP209 PUSH ROD POWER SWITCH MP210 COVER AC SWITCH MP 228 GUARD BASE MP229 LATCH PTI MP230 DECAL 8921A ONLY MP231 DECAL KNOB MP232 SPECIFICATION DECAL MP233 PANEL FRONT MP23U DECAL BASE SIDES MP235 BASE STANDARD MP236 HOLE PLUG Q200 XSTR SI PNP Q201 XSTR SI PNP Q202 XSTR SI PNP Q203 XSTR SI PNP Q204 XSTR SI PNP Q205 XSTR SI NPN
57. 000 20 1007 C51 CAP CER 10 000 20 1007 C53 CAP PAIR C53 amp C55 C54 1000 10 500V C55 CAP PAIR C53 amp C55 C56 CAP TA 10UF 20 20V C57 CAP MYLAR 0 027UF 10 2507 C58 CAP VAR 1 7 10 250V CRI DIODE HI SPEED SWITCH 5 18 8920 8921 FLUKE STOCK 489369 479519 474551 479253 460832 218206 460825 460840 460170 460147 149153 218206 474940 148924 330662 149153 161919 149153 330662 354852 369173 330662 149153 362756 330662 330662 190314 218206 330662 148924 149153 354852 330662 330662 189153 330662 330662 358234 358234 357806 149153 149153 463208 357806 463208 330662 267120 321109 203323 MFG SPLY CODE 89536 73445 95275 95275 95275 72982 95275 95275 72982 91293 56289 72982 80031 72892 56289 56289 56289 56289 56289 80031 80031 56289 56289 80031 56289 56289 51642 12982 56289 12892 56289 80031 56289 56289 56289 56289 56289 56289 56289 56289 56289 56289 89536 56289 89536 56289 73445 9 1293 07910 OR TYPE 489369 C280MAG A22K 15 1814 VY10CAUR3 VK20BA511J 530 000 VK20BA390J VK20BA512J 538 002 9300 CO23B101F103M 530 000 2222 638 03188 5855 000 Y5UD 5032 196 106 0020 1 CO23B101F103M 1960 105 00359 41 CO23B101F103M 1960106 0020 1 2222 638 10399 2222 638 10101 1960106 0020 1 C023
58. 03 5 603 4 Counter Output Option Troubleshooting Bons 603 6 603 5 Counter Output Option PCB Assembly k CR Rara pA a ers 603 9 604 1 Performance Test c YOU COE Lac e DILE pi db Rd CR RARO 604 3 604 2 Logarithmic Analog Output Option PCB Assembly 604 5 8920A 8921A FIGURE gt tad Sod 12 T To L t t IR lt iw e 3 6 3 7 3 8 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 603 1 603 2 603 3 603 4 603 5 603 6 604 1 604 2 604 1 604 4 List of Illustr ations TITLE PAGE Frontispiece ur ua tu ie va d vade os vaca PTI Connection aa eres waa Zel Controls Indicators and Connectors ent iti e E as ens 2 2 Matched Impedance Measurement Techniques VEN Soa dodi ees 2 5 Typical Relative dB Measurements nm vos xa 2 7 Overall Block Diagram TOES Vid 3 1 Detailed Block Diagram ex sieh SX Fg wa e RENS 3 3 Signal Conditioner gana beg aos oe ER 3 4 RMS Converter E ieee 9 9 A D Converter Simplified Schematic and Timing 3 6 Controller Timing D Converter ate paka 2 Controller F
59. 0A only or the IEEE 488 Interface See Section 6 for details COUNTER OUTPUT An output port reserved for use with the Counter Output Option 003 See Section 6 for details Linear Analog input Power Connector 2 12 OPERATING NOTES 22 13 The following paragraphs describe various conditions which vou should be aware of before attempting to operate the 8920A 89214 2 14 Fuse Replacement 2 15 The Model 8920A 8921A is fuse protected from the power line You can access the fuse by pressing and turning CCW the fuse cap located on the rear panel When replacement is necessary use an MDL type 1 8 amp slo blo fuse for all voltage configurations 2 16 Display Indications 2 17 In addition to the standard digital readout we have equipped the front panel display with a series of unique visual indicators These include an overrange overload indication an underrange indication and an analog meter They function automatically to help vou make error free measurements 2 18 For example when an input signal level exceeds the display limit for the selected range an overrange will occur The display digits Hash while the overrrange is present Selecting higher range will eliminate the overrange condition 2 19 Measurement accuracy is uncertain when the higher voltage ranges are used to measure low level signals alert you to this condition the decimal point will flash wnen the input is too low for the selected
60. 1 W RES COMP 160 5 1 4W RES VAR CER 500 10 1 2W RES VAR CER 50 10 1 2W RES MF 121 11 1 8W RESISTOR DUAL FET SET RES COMP 300 5 1 4W RES COMP 18 5 1 4 RES COMP 18 51 1 wW RES COMP 300 5 1 4W RES MF 442 1 1 6W RES 100 1 1 8 RES MF 12 1 1 1 8h RES COMP 1K 5 1 9 RES MF 20 0 5 1 8W RES PAIR R56 amp R57 RES PAIR R56 amp R57 RES COMP 1M 5 1 4W RES COMP 1M 5 1 4W RES COMP 1M 5 1 4 RES COMP 1M 5 1 4 RES COMP 6 2M 5 1 W RES SET R18 R35 R65 R79 SELECTED IN TEST RES COMP 510 5 1 uW RES MF 3 57K 11 1 8W RES COMP 100 5 1 uW RES COMP 33 7 5 1 4 RES MF 4 amp 99K 15 1 8W RES CER 100K 7 10 1 2 390 5 1 4W RES COMP B 2K 5 1 u RES COMP 10K 5 1 4W SELECTED IN TEST RES COMP 390 5 1 48 RES MF 619 11 1 8W RES SET R18 R35 R65 879 RES COMP 100 5 1 4W RES COMP 820 5 1 uW RES MF 619 1 1 8W RES COMP 22K 5 1 w RES COMP 33 5 X 1 NW FLUKE STOCK NO 175034 463182 313072 147926 313072 175034 148015 148130 261859 325613 447862 343160 476788 348276 219022 219022 348276 474452 474437 296608 148023 494302 467662 467662 182204 182204 182204 182204 221960 463182 218032 226217 147926 175034 268813 369520 147975 160796 148106 147975 313072 463182 147926 148015 313072 1
61. 1 1 XR204 2 On Table 5 3 A1 8921A Main PCB Assembly delete the following items XF1 1 XR204 CHANGE 2 ECO 11586 b Delete Item C415 from Figures 603 4 and 8 5 c Delete Item C415 from Table 603 3 Replace E402 with OUTPUT on Figure 603 4 3 11637 E 1 Delete Item 1 404 from Figure 603 4 and 8 5 2 Delete Item 1404 from Table 603 3 P CHANGE 4 ECO 11784 On Table 603 5 003 Counter Output Option make the following changes ADD R40i Res comp 100 5 m 1 4W 147926 01121 CB105 1 212704 212704 MP9 Bus Wire 20 44 5469 89536 445469 AR Figure 603 6 and 8 5 make the indicated changes ADD R40 H On Figure 8 5 make indicated changes 15V I5N PAOI O D ECTS ELK R40 100 PI i INPUT ADD R40 7A 2 8920 8921 CHANGE 5 ECO 11812 On Table 5 2 Al 8920A Main PCB Assembly make the following changes DELETE 213 cer 10 000 pF 20 100V 149153 56289 CO23B10F 103M Ref CHANGE TOT QTY of C204 from 4 to 3 On Figure 4 5 5 2 Calibration and Test Point Locations and 8 1 A1 8920A Main PCB Assembly Sht 2 of 3 make the indicated changes DELETE C213 On Figure 8 1 A1 8920A Main PCB Assembly Sht 3 of 3 make the indicated changes HIGH SOURCE 4 5103 9 l4 4V J103 2 AC 0203 02 9 gt PC TE 45 V A Q32 229 _2 200 C eM C2 3
62. 11237 CTS Keene inc Paso Robles California 11358 CBS Electronic Div Columbia Broadcasting System Newburypon Minnesota 11403 Best Products Co Chicago illinois 11503 Keystone Columbia Inc Warren Michigan 11532 Teledyne Relays Hawthorne California 11711 General Instrument Corp Rectifier Division Hicksville New York Federal Supply Codes for Manufacturers cont 11726 Qualidyne Corp Santa Clara California 12014 Chicago Rivet amp Machine Co Bellwood lilinois 12040 National Semiconductor Corp Danburry Connecticut 12060 Diodes Inc Chatsworth California 12136 Philadelphia Handle Co Camden New Jersey 12300 Potter Brumtield Div AMF Canada LTD Guelph Ontario Canada 12323 Presin Co Inc Shelton Connecticut 12327 Freeway Corp formerly Freeway Washer amp Stamping Co Cleveland 12443 The Budd Co Polychem Products Plastic Products Div Bridgeport Pennsylvania 12615 U S Terminals Inc Cincinnati Ohio 12617 Hamun Inc Lake Mitis Wisconsin 12697 Clarostat Mfg Co Dover New Hampshire 12749 James Electronics Chicago Illinois 12856 Micrometals Sierra Madre California 12954 Dickson Electronics Corp Scottsdale Arizona 12969 Unitrode Corp Watertown Massachusetts 13103 Thermatioy Co Inc Dallas Texas 13327 Soltron Devices inc Tappan New York 13511 Amphenol Cadre Div Bunker Ramo Corp Los Gatos California
63. 182204 182204 426759 453662 425900 425900 425900 426759 426759 453670 453605 445197 234278 234278 458349 3638 38 428862 418954 381848 355198 458463 419002 381848 404681 418566 413740 381988 460410 355107 159798 486654 486662 486605 486621 486621 486647 486639 486613 375188 _ 460238 343285 MFG SPLY CODE 01121 91637 91637 89536 91637 01121 01121 91637 01121 01121 01121 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 82389 82389 89536 02735 02735 02735 02735 02735 89536 02735 02735 02735 18324 18324 04713 12040 07236 07910 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 0779 MFG PART OR TYPE CB1055 CMF551182F CMF551182F 369520 CMF551103F CB8235 1045 CMF55 1003F CB1515 CB1055 CB1055 426759 453662 425900 425900 425900 426759 426759 453670 453605 445197 XW1659 XW1659 458349 CD4016AE CA3130 CA30963E CDHONSAE CD4011AE 458463 CD4049AE CD4069UBE LM358 CR999 LM307N 52620120 LM317T F78050C 51 486654 476662 486605 486621 486621 486647 486639 486613 375188 460238 2 33 127 6 REC QTY REF REF REF REF mA NY TEE PO oe BOO A A 8920A 8921A Table 5 2 A1 8
64. 1A 1 USED A BANANA TO BNC ADAPTER WILL ALSO BE REQUIRED Figure 603 4 Counter Output Performance Test Set Up 603 4 8920A 8921A E83 Table 603 2 Counter Output Amplitude procedure then the option will require troubleshooting If however the limits are met then we recommend that OSCILLOSCOPE the pertormance test be completed as a check COMMENTS DISPLAY 20 1 Remove the UUT s top cover and measure the Observe 100 mV Adjust calibrator inverter power supply voltages squarewave output to obtain MEASURE BETWEEN DVM DISPLAY A Observe 100 mV Adjust calibrator t to obtai peres C413 and Ground 5 0V 0 3V C414 and Ground 6 2 0 3V 2 Connect the AC Calibrator UUT oscilloscope COUNTER TIMER and terminations as shown in Figure 603 3 DISPLAY 31 COMMENTS DIGIT 3 Setthe AC Calibrator to its IV range 10 kHz Aun set the oscilloscope ume Dat to 20 usec div and Vert to 50 mV div and set the UUT to UUT display FUNCTION VOLTS DISPLAY MODE and 2V range HOLD Adiust the 50503 oo 4 Apply 180 mV 10 kHz from the AC Calibrator pd to the input of the UUT Using the oscilloscope cheek UUT s counter output and adjust R404 until a symmetrical square wave is obtained The 603 15 Calibration amplitude of the square wave should be 100 mV peak 206 and must not change as the input to the 603 16 The Counter Output Option should b
65. 2 Logarithmic Analog Output Option PCB Assembly FLUKE STOCK NO LOGARITHMIC ANALOG OUTPUT OPT FIG 606 4 ORDER CER 1000PF 10 500V CAP CER 100PF 10 1000V CAP MYLAR 2 0UF 202 100V CAP TA 22UF 20 15 CAP ELECT TA 2 2UF 10 20V CAP ELECT TA 22UF 101 20V DIODE HI SPEED SWITCH BANANA JACK BLACK BANANA JACK RED COVER PLATE LOG ANALOG OPTION CABLE LOGARITHMIC ANALOG OUTPUT XSTR DUAL SI NPN XSTR PFET JNCT N CHANNEL RES VAR 100K 10 1 2W RES MF 10K 1 1 8W RES COMP 15M 5 1 4W RES COMP 10K 5 1 4W RES MF 37 5K 0 1 1 8 RES MF T5K 0 1 1 8W RES MF 150K 0 25 1 8W RES MF 100K 0 1 1 8W RES VAR 20K 10 1 20 RES MF 150K 0 25 1 8W RES COMP 47K 5 1 4W RES MF 158K 1 1 8W RES MF 994 21 1 2W RES MF 20K 0 11 1 8W RES MF 1 5M 1 1 2W RES COMP 1K 5 1 4 RES MF 100K 5 1 8W RES MF 143K 1 1 8W CONNECTOR POST CONNECTOR POST CONNECTOR POST CONNECTOR POST 1C C MOS HEX BUFFER INVERTER IC LINEAR OP AMP WIRE ASSEMBLY i Refer to Figure 604 1 357806 105593 334185 423012 160226 160226 203323 162073 162065 456772 486688 295717 376475 369520 168260 381491 148106 442947 370916 442707 370775 335760 442707 148163 237214 477018 446443 284976 148023 248807 291336 379438 379438 379438 379438 381848 402669 488163 MFG SPLY CODE 004 56289 71590 14752 56289 56
66. 21A 5 16 Table 5 4 A1A1 Display PCB Assembly FLUKE MFG DESCRIPTION STOCK SPLY NO CODE MFG PART NO OR TYPE TOT REC QTY QTY DISPLAY ASSY 20A 21A 4002T FIG 5 4 ORDER MODEL 89204 OR 8921 1 CAP TA TUF lt 20 35V 181919 56289 196D105x0035JA1 1 CR301 DIODE HI SPEED SWITCH 203323 07910 144848 1 1 05301 DISPLAY LED 495457 29083 QDSP3507 1 95302 DISPLAY LED 495440 28480 QDSP3515 4 DISPLAY LED 495440 28480 QDSP3515 REF DS304 DISPLAY LED 495440 28480 QDSP3515 REF 05305 DISPLAY LED 495440 28480 QDSP3515 REF 05306 DIODE LIGHT EMMITING 385898 28480 5082 4887 5 25307 DIODE LIGHT EMMITING 385898 28480 5082 4887 REF DIODE LIGHT EMMITING 385898 28480 5082 4887 REF DS309 DIODE LIGHT EMMITING 385898 28480 5082 4887 REF 95310 DIODE LIGHT EMMITING 385898 28480 5082 4887 REF P301 CONN POST 376574 00779 3 87022 1 18 Q301 XSTR SI PNP 3h0026 89536 310026 1 1 RES COMP 150 5 1 4W 147934 01121 1515 3 R302 RES COMP 12 7K 5 1 5 W 170720 01121 2725 1 R303 RES COMP 150 5 1 4 147934 01121 1515 R304 RES COMP 15K 5 1 4W 148114 01121 CB1535 1 305 RES COMP 150 5 1 4W 147934 01121 1515 REF U301 RES NETWORK 461442 89536 461442 1 U302 IC TTL LO POWER DECODER DRIVER 418632 01295 SNT7ULUTN 11 158307 R301 05310 y 05306 Y a305 105309 Y E C xau C301 00000000A
67. 236 R237 R238 R239 R240 R244 5201 1 5201 206 5202 1 5203 1 5204 1 5205 1 5206 1 5207 5208 5208 1 5209 5210 T200 U200 U201 U202 0203 020 0205 0206 9207 0209 9210 0211 VR201 VR202 VR203 VR208 1 We w5 6 W7 W201 1 XF1 1 Table 5 3 A1 8921A Main PCB Assembly cont DESCRIPTION RES MILFLM 909 1 1 8W RES MTLFLM B 66K 1 1 8 RES 2K 10 1 2 RES COMP 1M 5 1 4 RES MTLFLM 11 8K 0 25 1 8W RES MTLFLM 11 8K 0 25 1 8W RES VAR CER 100K 101 1 2W RES MTLFLM 110K 1 1 8W 5 82 5 1 4W RES COMP 100K 5 1 4W RES MTLFLM 100K 11 1 8W RES COMP 150 5 1 4W RES COMP 1M 52 1 4W RES COMP 1M 5 1 4W BUTTON RANGE SWITCH SET BUTTON FUNCTION BUTTON FUNCTION BUTTON FUNCTION BUTTON RANGE BUTTON RANGE SWITCH ROTARY SWITCH POWER BUTTON SWITCH GREEN SWITCH SLIDE SWITCH SLIDE POWER TRANSFORMER Q IC C MOS QUAD BI LATERAL SW IC LIN IC LIN 5 XSTR ARRAY 2 PNP 3NPN Q IC C MOS HEX BUFFER IC C MOS QUAD 2 INPUT NAND 8920 CUSTOM LSI IC LIN NPN XSTR ARRAY IC C MOS HEX BUFFER IC C MOS HEX INVERTER IC LIN OP AMP IC LIN OP AMP DIODE ZENER 6 V IC LIN ADJ REG IC LINEAR VOL REG DIODE ZENER WIRE ASSY FRONT PANEL WIRE ASSY FRONT PANEL WIRE ASSY FRONT PANEL WIRE ASSY FUSE WIRE ASSY FUSE WIRE ASSY JUMPER HOLDER FUSE FUSEHOLD
68. 289 56289 07910 74970 74970 89536 89536 24355 89536 89536 91637 01121 01121 91637 91637 91637 91637 89536 91637 01121 91637 89536 91637 91637 01121 91637 91637 0779 0779 0779 0779 02735 02735 89536 MFG PART NO OR TYPE OPTION CO 16B102G 102K DD 101 230B1B105 196 226 0015 441 150D225X90204 150D225X90204 INS 448 108 0903 001 108 0902 001 456772 486688 08 11 00 17 376475 369520 CMF551002F CB1565 CB1035 CNF553752B 557502 551503 CMF551003B 335760 CMF551503C CB4735 CMF551583F 477018 CMF552002B CMF65 1504F CB1025 CMF551003F CMF55 1433F 1 87022 0 1 87022 0 1 87022 0 1 87022 0 CD4047AE 2 488163 QTY rj gt X A rj em X A Po mh h m uh A REF REF REF 604 5 8920A 8921A Figure 604 4 Logarithmic Analog Output Option PCB Assembly 604 6 8920A 8921A RANGE INFORMATION DC INPUT FROM THERMAL SENSOR SCALING OUTPUT SAMPLE AND LOGARITHMIC OUTPUT Figure 604 2 Logarithmic Analog Output Option Simplified Schematic equipment necessary to calibrate the main rame instrument No additional equipment is required to check calibrate or troubleshoot the 004 Option 604 13 Performance Test 604 14 The following procedure will verify that the Logarithmic
69. 2W 460121 91637 HFF1 9914F 1 R3 RES VAR CER 5K 10 1 2 327569 89536 327559 2 1 R4 RES MF 96 5K 1 1 8W 474478 91637 CMF559652F 1 R5 RES VAR 10 201 1 2W 479311 80031 ET50W100 1 1 R R6 RES MF M 1 1 HW 478486 91637 CMF6010018F 1 A R7 RES VAR CER 500 10 1 2W 325613 89536 325613 2 1 R8 RES MF 9 76K 0 5 1 8h 474460 91637 559761 1 R9 5 15 54 1 hW 148114 01121 1535 2 R10 RES COMP 100 5 1 4W 147926 01121 105 6 R11 RES COMP 15K 5 1 4W 148114 01121 1535 R12 RES CERMET 9 09M 1 1 4W 459875 89536 459875 1 R13 RES MF 20 0 51 1 8W 494302 91637 CMFS55R200D 2 R14 RES COMP 1M 5 1 4W 182204 01121 1055 5 R15 RES COMP 6 2M 5 1 4W 221960 01121 CB6255 2 R16 RES COMP 22M 5 1 NW 221986 01121 CB2265 01 R17 RESISTOR DUAL FET SET 476788 89536 476788 1 js 5s R18 RES SET R18 R35 R65 RT9 463182 89536 463133 1 R19 SELECTED IN TEST R20 RES COMP 510 5 1 4W 218032 01121 5115 3 R21 RES COMP 390 51 1 4W 147975 01121 CB3915 8 R22 RES COMP 8 2K 55 1 8 160796 01121 CB8225 2 823 RES COMP 10K 5 1 4 148106 01121 1035 2 R25 RES MF 499K 4 15 1 8 268813 91637 551993 3 R26 RES VAR CER 100K 10 1 2W 369520 89536 369520 2 1 R27 RES COMP 390 5 1 4W 147975 01121 3915 REF R28 RES MF 1 58K 1 1 8W 385344 91637 CMF551581F 1 R29 RES COMP 100 5 1 4W 147926 01121 105 REF R30 RES COMP 100
70. 36 89536 895 36 04713 04713 03508 89536 89536 01121 91637 91637 01121 89536 91637 91637 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 89536 91637 91637 MFG PART NO OR TYPE 463224 167696 467704 456756 456731 475681 1618801 467548 483107 473546 473611 573173 473652 454702 407502 340026 340026 340026 340026 340026 2N3904 283904 D45C5 261388 261388 CB1045 CMF552151F CMF553013F CB1055 309674 CMF554993F CMF554752F CB1035 CB6835 CB1515 CB2235 CB1035 3345 CB1035 62825 CB2235 681045 CB1025 CB2035 CB2035 CB1025 CB2035 309674 CMF559092F CMF559530F mh zh INO REF REF REF REF e REF REF REF VIEW TYPICAL BOTH SIDED MP203 H20012 CAUTION SUBJECT DAMAGE BY STATIC ELECTRICITY MP207 H20012 H20202 WANBLK MP205 MP231 Figure 5 3 A1 8921A Main PCB Assembly 5 15 8920A 8921A MEI ss s nno ous 045 rt ott Ovt OtL 020 010 e TED roth torn 9 824 a2 tic og2 O 120 O gu Figure 5 3 1 8921A Main Assembly cont tour 8920A 89
71. 4 4 Specifications for the Logarithmic Analog Output Option are piven in Section of this manual 604 5 INSTALLATION 604 6 The Logarithmic Analog Output Option may be installed on the 8920A oniy Install the option as follows referring to Figure 604 1 i Remove the top cover see Access Procedures 2 Remove the plate located at the top of the 8920 s rear panel 3 Install the Banana Jack plate with the red banana Jack to the right when viewing the 8920A from the rear 4 Secure the Logarithmic Analog Output Assembly to the top of the transformer bracket see Figure 604 1 using the two screws provided 5 Plug P501 into J501 located on the Main PCB Assembly 6 Solder the Logarithmic Analog Output Assembly s red output lead to the red banana jack and the black lead to the black banana Jack 004 Option Logarithmic Analog Output 604 5 OPERATION 604 6 Once installed the Logarithmic Analog Output Option requires operator attention other than ensuring that no voltage is ever applied to the option s output banana jacks 604 7 THEORY OF OPERATION 604 8 The Logarithmic Analog Output Option illustrated in Figure 604 2 utilizes the logarithmic characteristics of a P N junction to develop an output proportional to the logarithm of the dc input from the thermal sensor 604 9 The dc output voltage of the thermal sensor develops a collector current in one half of a dual transistor The resulting emitte
72. 454702 407502 340026 340026 340026 380026 340026 218396 218396 325753 261388 261388 148189 293712 379156 182204 309674 349191 474585 148106 148171 147934 148130 148106 192948 148106 148098 148130 118189 148023 221614 221614 148023 221614 309674 223537 288555 312629 260364 309666 MFG SPLY CODE 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 04713 04713 03508 89536 89536 01121 91637 91637 01121 89536 91637 91637 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 89536 91637 91637 91637 91637 89536 MFG PART NO OR TYPE 467704 456780 456731 475681 464404 467548 473546 473611 453175 473652 454702 407502 340026 340026 340026 340026 340026 2N3904 2N3904 94565 261388 261388 1045 CMF552151F CMF553013F CB1055 309674 CMF554993F CMF554752F CB1035 CB6835 CB1515 CB2235 CB1035 CB3345 CB1035 CB62825 CB2235 CB1045 CB1025 CB2035 CB2035 CB1025 CB2035 309674 CMF559092F CMF559530F CMF559090F CMF558661F 309666 TOT REC QTY QTY m ud k D ca REF REF REF REF 59 20 Bony Ab PU res 6 oe 2 Na Ce ITEM Table 5 2 A1 8920A PCB Assembly cont
73. 48130 175034 MFG SPLY CODE 01121 89536 91637 01121 91637 01121 01121 01121 01121 89536 89569 91637 89536 01121 01121 01121 01121 91637 91637 91637 01121 91637 89536 89536 01121 01121 01121 01121 01121 89536 01121 91637 01121 01121 91637 89536 01121 01121 01121 01121 91637 89536 01121 01121 91637 01121 01121 MFG PART OR TYPE CB3305 463133 CMF556190F CB105 CMF556190F CB3305 CB8215 CB2235 CB1615 325613 447862 CMF551210F 476788 CB3015 CB1805 CB1805 CB3015 CMF554420F CMF551000F CMF55 12R1F 1025 CMF55R200D 467662 467662 CB1055 CB1055 CB1055 CB1055 CB6255 463133 CB5115 CMF553571F CB105 CB3305 CMF554993F 369520 CB3915 CB8225 CB1035 CB3915 CMF556190F 453133 CB105 CB8215 CMF556190F CB2235 CB3305 REC QTY REF D gt REF REF REF REF REF REF REF REF REF REF 2 REF REF REF REF REF REF REF REF 5 21 8920A 8921A VRA XR18 XR35 XR65 79 Table 5 5 2 8920A 8921A Assembly cont DESCRIPTION RES COMP 160 51 1 uW RES COMP 300 5 1 46 RES COMP 300 5 1 4 RES COMP 18 5 1 4W RES COMP 18 5 1 4W RES MF 1K 1 1 8W RES MF 100 1 1 8W RES MF 7 50K 1 1 8W RES MF 51 1K 1 1 8W RES COMP 1K 51 1 lW SELECTED IN TEST SELECTED IN TEST RES MATCHED SET RES MF 20 5K 1 1 8W RES MF u99K
74. 5 8920A 8921A Table 4 4 dB Display Mode Check REFERENCE SOURCE DISPLAY OHM READING OMENS Note that the dB annunciator is lit Note that the dB and REL annunciators are lit Step up to the 20V range note that the dB and REL annunciators remain lit SHIELDED CABLE DC CALIBRATOR 341A 24 8920 8921 l Figure 4 2 DC Low Level Check Test Set Up 8920 8921 T Table 4 5 DC Low Level Chack UUT DISPLAY DC INPUT FUNCTION 16 COUNTS COMMENT 1V 2V 1 000 30 counts UUT dc circuitry functioning AUTO 02 00 or mVrms The ac input component should be depress LO see comment less than 0 2 mV The mVac component RANGE 6 counts can be measured by temporarily selecting ENABLE the AC and LO RANGE ENABLE switches If it is greater than 0 2 mV mVrms V 2 mVdc mVacY 8920A 8921A Figure 4 3 AC Low Level Check Test Set Up BNC TO BANANA ADAPTER 8920A 8921A PRECISION CABLE NOTE TERMINATION MUST BE CONNECTED AS CLOSE AS POSSIBLE TO 8920A or 8921A INPUT Figure 4 4 High Frequency Response Check Test Set Up 4 7 8920A 8921A gt 4005 anno E iost 1432 tts Vaid avad 1 imr 50445 gx Ho TE I apre HITE o n TP208 8 rota R229 po P UN core 21947
75. 56156 110395 184044 152181 152819 162073 162065 414201 436774 2536778 436774 461806 461095 417329 474213 478693 320911 186288 478685 475392 468868 456749 463225 467696 MFG SPLY CODE MODEL MODEL 89536 56289 12136 73445 56289 56289 72136 72136 89536 89536 89536 80031 56289 56289 21845 09214 07910 07910 07910 21845 21845 07910 07910 71400 73734 73734 73734 73734 78199 74970 74970 02660 60065 60065 60065 89536 00779 22526 22526 22526 89536 72259 32171 89536 89536 89536 89536 89536 MFG PART NO OR TYPE 89204 89204 OR 89214 446807 19647 4X00358A1 DMF15151J C2 80MAH 220K 023 10 103 023 10 103 195712 DMF19302J 460279 460279 460279 3143TS502V015 CO23B10F 103M C023B10F 103M J775 0LP MPD200 148448 INHNNB F903C 22 F903C 22 144448 INHB MDL1 8 22022 1355 8002 19047 511 061800 00 108 0903 001 108 0902 001 31 010 85 109 1 04 SS 109 1 04 55 109 1 04 461806 87406 1 65500 104 65500 1081 65500 110 320911 WEE390 OMC DMA 001 CP2 475392 468868 456749 463224 467696 0 REF REF REF REF 5 5 8920 8921 Table 5 2 A1 8920A Main PCB Assembly cont ITEM DESCRIPTION NO MP207 BRACKET FRONT PANEL MP 208 PANEL REAR MP20
76. 6 Increase the input to 0 5V The voltage at the 3 Apply the input voltages and frequencies as output should be the same as the front panel display listed in Table 4 7 and adjust to the limits given If 0 001 V any limit cannot be reached see Troubleshooting B Table 4 9 4 34 AC Low Level Calibration 4 32 Linear Analog Output 8920A only 4 35 Use the following procedure to calibrate the UUT s AC low level performance 4 33 Use the following procedure to calibrate the 8920A s Linear Analog Output I Measure the 503 Attenuator Errors leveled generator 1 Set up the calibration test equipment as shown in Figure 4 6 l a Place all front panel switches 2 Select AC and AUTORANGE LO RANGE ENABLE 3 Apply 1 000 500 Hz totheinputand monitor l b Set up the test equipment as shown the dc voltage at the rear panel linear analog output Figure 4 3 4 10 8920A 8921A E Set the leveled generator to 50 kHz XI and connect the 874 20 dB GR attenuator input to the input of the UUT 1 4 Adjust the leveled generator amplitude until a steady reading of 1 000V is obtained on the display of the UUT l e Switch the leveled generator to the X I setting observe that the UUT autoranges down to the 100 mV range and note the reading error I f Switch the leveled generator to the X 01 setting and notethat the reading error is less than 10 digits on the 20 mV range Calibrate
77. 8921A SSHOLIMS TANVd LNOtid Ter S ee EI id 9 YOLVIONIINNY 8 uaid3ANOQ Qv TF u3110u1No 5 SHOLVIO NOILAO NANNY indino 2 viva j O 380H1S HOOP 08 AV ldSIQ H3MOd H3MOd 1 dNi m 1 AS SNIGOON3 OLNY 3ON3H3 d3H E A ama 9 x w E x o and Figure 3 2 Detailed Block Diagram SHOVE VNYNVS TNI GEN 1268 20 ANO ONG HOSN3S SWH dny YOLYNANILLY 0268 inano 31VIG3Wu3LNI Er 31926707104 SWH AL _ _ _ _ ____ __ __ __ __ __ __ _ UNKNOWN INPUT INPUT ATTENUATOR INTERMEDIATE 1V RMS 180 TO 51 1 110 or 11000 ATTENUATOR FULL SCALE 700V AC RMS SENSOR X5 or 50 PANI ONAL CONDITIONER RANGE DECODER CONTROLLER Figure 3 3 Signal Conditioner FRONT PANEL STEP COMMAND ma CEN Table 3 1 Signal Conditioner Gain Configuration INPUT INTERMEDIATE CONDUCTING ATTENUATOR ATTENUATOR COMPONENTS K1 Q6 028 30 Q32 K1 06 029 032 K1 06 029 031 B K2 05 029 032 K2 Q3 Q5 029 031 E K2 Q4 Q5
78. 9 PUSH ROD POWER SWITCH MP210 COVER AC SWITCH MP228 GUARD BASE MP229 LATCH PTI MP231 DECAL KNOB MP 232 SPECIFICATION DECAL MP233 PANEL FRONT MP234 DECAL BASE SIDES MP235 BASE STANDARD MP236 HOLE PLUG Q200 XSTR SI PNP Q201 XSTR SI PNP Q202 XSTR SI PNP Q203 XSTR SI PNP 0204 XSTR SI PNP Q205 XSTR SI NPN Q206 XSTR SI NPN Q207 XSTR SI PNP PWR Q208 XSTR FET GRP N CHANNEL Q209 XSTR FET GRP N CHANNEL R200 RES COMP 100K 5 1 hW R201 RES MTLFLM 2 15K 11 1 8W R202 RES MTLFLM 301K 14 1 8 R203 RES COMP 1M 4 5 1 w R205 RES VAR CER 10K 10 1 2W R206 RES MTLFLM H99K 11 1 8W R207 RES MTLFLM 47 5K 1 1 8W R208 RES COMP 10K 5 1 4W R209 RES COMP 68K 5 1 4W R210 RES COMP 150 5 1 4 R212 RES COMP 22K 4 5 1 4W R213 RES COMP 10K 5 1 4 R214 RES COMP 330K 5 1 4W R215 RES COMP 10K 5 1 lNW R216 RES COMP 6 8K 4 5 1 4W R217 RES COMP 22K 51 1 w R218 RES COMP 100K 5 1 w R2 19 RES COMP 1K 51 1 uW R220 RES COMP 20K 5 1 u w R221 RES COMP 20K 4 5 1 w R222 RES COMP 1K 4 54 1 4 R223 RES COMP 20K 5 1 w R224 RES YAR CER TOK 10 1 26 R225 RES MTLFLM 90 9K 1 1 8W R226 RES MTLFLM 953 1 1 8W R227 RES MTLFLM 909 1 1 8 R228 RES MTLFLM 8 66K 1 1 8W R229 RES VAR CER 2K 104 1 2W 5 6 8920A 8921A FLUKE STOCK NO 467704 456780 456731 475681 4658404 467548 473546 473611 453175 473652
79. 920A Main PCB Assembly cont FLUKE MFG Hai DESCRIPTION STOCK SPLY MFG PART NO XU200 SOCKET IC 14 PINS NOT SHOWN 370304 01295 931402 XU202 SOCKET IC NOT SHOWN 383285 00779 2 331271 6 XU203 SOCKET IC NOT SHOWN 343285 00779 2 331211 6 XU205 SOCKET IC 40 PINS 429282 09922 DILBYOP 108 IF VR201 IS REPLACED THE A D CALIBRATION RESISTOR R204 MAY HAVE TO BE RESELECTED SEE SECTION 4 A D CALIBRATION RESISTOR SELECTION 8920A 8921A TOT 1 2 REF 1 Cx Moo M E J5 TOP FI XF1 MP236 CRI MP208 MP228 gt 1200 A1 MP210 MP235 VIEW B B 232 RECT BRIDGE 206 H200 E MP209 229 234 VIEW TYPICAL BOTH SIDES MP203 H200 2 AUTION i AES DAMAGE BY STATIC ELECTRICITY E NEN MP204 MP207 pil ou N H200121 Z MP233 N X M1 WIRED 5208 1 H201 2 20212 W2 BLK 1 w5 Figure 5 2 A1 8920A Main PCB Assembly 5 9 8920A 8921A Vg di N O10 60 85 Dstt N voco 1042 8 402 un Ha 040 soto OO 5 if Q vote avad L Figure 5 2 A1 8920A Main PCB Assembly cont 5 10 lt T lt M e e ITEM NO R227 R228 R229 R230 R231 R232 R234 R235 R
80. AND GROUND REMOVED ECO 11792 Hardware change on 8921 A 4011 Assembly no action required in manual CHANGE 6 11863 On Table 5 4 8920A 8921 A Display PCB Assembly make the tollowing changes 453340 29083 MAN3630A DS301 Display SSS 453332 29083 MAN3620A DS302 DS305 Display LED 495440 28480 ODSB32 5 4 CHANGE 7 ECO 11866 Hardware change on 8920A 4001 and 8921 A 4011 Assembly no action required in manual 7A 3 7 A 4 8920A 8921A sueJ6eig 8 uono s 1668 0468 uondo mdmo gopeuy onuuiae307 p00 etti uondo mdmo 1211009 lt 00 Utt god 1268 0268 CV Aiquiassy god V1768 V0768 ttti Aiguassy god URW VIZ68 TV ttt Kquiessy god voces ATLL SLNALNOS 30 27892 38913 Ajquiessy 824 vOZ68 LV 1 8 aanbid 1091 90668 6015 lt U OLL OFZ OLZ OL LANL sors 500241 orty ol goar oori 58 did Si isizan GE 2 8 b d 5 i m T 9022 95 gt i 59 45 0595 8 ooz4i 5029 Fg 1 i 20785 xz cu EZ SE CE EST tor 4 SELA gt EU SLL 4 Cu 101 _ 68 0268 2009 Ajquiessy 994 v0Z68 LV 1 8 241613 H E
81. B101F103M 2222 631 10689 196D106X0020KA1 1960 106 0020 1 200 050 601 502M 530 000 1960106 0020 1 5855 000 Y5UD 5032Z CO23B101F103M 2222 638 10399 196D106X0020KA1 196D106X0020KA1 C023B101F 103M 1960106 0020 1 1960106 0020 1 196D396X0020PE4 196D396X0020PE4 CO16B102G 102K CO23B10 1F 103M 023 101 103 463208 C0168102G 102K 463208 196D106X0020KA1 C280MAE AH TK 9301 INH1H18 QTY 1 LA fO 11 REF REF REF REF REF REF REF REF REF REF REF REF REF REF REF 914 015 Q16 017 018 919 920 921 923 024 925 926 028 929 930 931 932 Table 5 5 A2 8920A 8921A AC PCB Assembly cont DESCRIPTION DIODE HI SPEED SWITCH DIODE SI LO CAP LO LEAK DIODE SI LO CAP LO LEAK DIODE HI SPEED SWITCH DIODE HI SPEED SWITCH DIODE HI SPEED SWITCH DIODE HI SPEED SWITCH DIODE HI SPEED SWITCH SOCKET SINGLE IN LINE 4 POST CONTACT COIL REED RELAY REED SWITCH COIL REED RELAY REED SWITCH SHIELD AC SPACER XSTR MNTG SHIELD THERMAL EQUALIZER POST CONTACT POST CONTACT POST CONTACT CONNECTOR XSTR SI NPN SELECTED XSTR SI NPN SELECTED XSTR FET JCT N CHANNEL XSTR FET JCT N CHANNEL XSTR FET JCT N CHANNEL XSTR FET JCT N CHANNEL XSTR SI PNP DUAL FET RESISTOR SET XSTR MATCHED SET XSTR SI PNP XSTR MATCHED S
82. C A Caiie 9 Con Calle 4 Edif Edinurbi Apartado de Correos NR 70 136 Los Ruices Caracas 1070 Venezuela Tet 2 239 0967 TL X 395 21027 Yugoslavia mtest Associates Ltd Clarence House 31 Clarence St Staines Middiesex TW18 4SY England Tel 784 63555 TLX 851 928855 g Supplied and Supported by Fluke Holland B V P O Box 2269 5600 CG Eindhoven Netherlands Tei 040 45805 TLX 51846 FAX 31 40 457515 Supplied amp nd Supported by Fluke International Corporation Box C9090 Everett WA 98206 U S A Tet 206 356 5500 FLX 185103 FLUKE UT FAX 206 356 5116 The following countries are represented by Fluke Holland B V P O Box 2269 5600 CG Eindhoven Netherlands Tei 040 45805 TLX 51846 FAX 31 40 457515 Abu Dhabi Mauritania Afghanistan Menorca Albania Mongolia Algeria Niger Angola Nigeria Benin Qatar Bornhotm Rodhos Botswana Russia Chad Sardinia Corsica Saudia Arabia Czechoslavakia Scotiand Dubai Senegal Ethiopia Sierra Leone Guinea Somalia ibiza Togo iceiand Upper iraq Wales Kuwait Wstn Sahara Liberia Yemen Libya Zaire Luxembourg Zambia Madora Zimbabwe Mallorca wam ss ss qp o Ca ew 8 RW U S A CA Burbank John Fluke Mfg inc 213 849 7181 CA Santa John Fluke Mfg 5 408 727 0513 CO Denver John Fluke Mfg Inc 303 695 1000 FL
83. Corp Saugerties New York 02131 General Instrument Corp Harris ASW Diy Westwood Maine 02395 Rason Mtg Cc New Yori 02533 Sneigrove CR Co Ltd Don Mills Ontario Canada M38 1M2 02606 Fenwa Labs Div of Travenal Labs Morion Grove Federal Supply Codes for Manufacturers 02660 Bunker Ramo Corp Conn Div Formerly Amphenoi Borg Eiectric Corp Broadview 02799 Areo Capacitors Inc Chatsworth Catitornia 03508 General Electric Co Semiconductor Products Syracuse New York 03614 Replaced by 71400 03651 by 44655 03797 Eidema Div Genisco Technology Corp Compton California 03877 Transistron Electronic Corp Wakefield Massachusetts 03888 KDI Pyrofilm Corp Whippany New Jersey 03911 Clairex Electronics Div Clairex Corp M Vernon New York 03980 Muirhead Inc Mountainside New Jersey 04008 Arrow Hart Inc Hartford Connecticut 04062 Replaced by 72136 04202 Replaced by 81312 04217 Essex Internationa Inc Wire amp Cable Anaheim Cahfornia 04221 Aemco Div of Midtex inc Mankato Minnesota 04222 AVX Ceramics Div AVX Corp Myrtle Beach Florida 04423 Teionic Industries Laguna Beach Calfornia 04645 Repiaced by 75376 04713 Motorola inc Semiconductor Products Phoenix Arizona 04946 Standard Wire amp Cable Los Angeles California 05082 Replaced by 94988 05236 Jonathan Mfg Co Fullerto
84. ER CAP GREY 1 4 X 1 1 4 FLUKE STOCK 312629 260364 309666 182204 325688 325688 369520 234708 188458 148189 248807 147934 182204 182204 426759 453662 425900 525900 425900 426759 426759 453670 453605 445197 234278 234278 458349 363838 428862 418954 381848 355198 458463 419002 381848 404681 418566 413740 381988 460410 355107 159798 486654 486662 486605 486621 486621 486613 375188 460238 MFG SPLY CODE 91637 91637 89536 01121 91637 91637 89536 91637 01121 01121 91637 01121 01121 01121 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 82389 82389 89536 02735 02735 02735 02735 02735 89536 02735 02735 02735 18324 18324 04713 12040 07236 07910 89536 89536 89536 89536 89536 89536 895 36 89536 GR TYPE CMF559090F CMF558661F 309666 CB1055 CMF551182F CMF551182F 369520 CMF551103F 8235 1045 CMF551003F CB1515 CB1055 CB1055 426759 453662 425900 425900 425900 426759 426759 453670 453605 445197 XW1659 XW1659 458349 CD4016AE CA3 130 CA30963E CDUOUGAE CD8011AE 458463 CD4049 AE CDAO69UBE LM358 CR999 LM307N 52020120 LM3 17T F78050C INT51A 486654 476662 486605 486621 486621 486613 375188 460238 TOT REC QTY REF REF REF hA 2A REF E
85. ET XSTR SI NPN XSTR SI NPN XSTR SI PNP XSTR SI PNP XSTR SI NPN XSTR SI PNP XSTR SI NPN XSTR SI PNP XSTR SI PNP XSTR SI NPN XSTR SI PNP XSTR SI NPN XSTR S1 PNP XSTR FET JCT N CHANNEL XSTR FET N CHANNEL XSTR FET N CHANNEL XSTR FET N CHANNEL XSTR FET JCT N CHANNEL FLUKE STOCK NO 203323 348177 348177 203323 203323 203323 203323 203323 847311 446898 284091 446898 284091 456830 472969 456830 489179 474742 474742 474742 485169 471565 471565 477448 376475 376475 376475 453829 476788 463133 454066 463133 333898 333898 225599 454066 333898 454066 333898 454066 454066 218081 229898 218081 229898 376475 261578 261578 261578 376475 MFG SPLY CODE 07910 07263 07263 07910 07910 07910 07910 07910 30035 71107 95348 71707 95348 89535 13103 89536 89536 22526 22526 22526 89536 89536 89536 89536 89536 89536 89536 24355 89536 89536 04713 89536 89536 89536 12040 04713 89536 04713 89536 04713 04713 89536 89536 89536 89536 89536 89536 89536 89536 89536 MFG PART NO TYPE 184448 FD7 223 FD7 223 148448 144448 144448 INA448 144848 55 109 1 04 920138 MR138 020134 138 156830 7717 30 456830 489179 65500 109 65500 109 65500109 485169 471565 47 1565 477448 376475 376475 376475 AD821 476788 463133 SP7755 463133 333898 333898 PN4250 SP7755 333898
86. Hungary Amtest Associates Ltd Clarence House 31 Clarence St Staines Middlesex TW18 45 United Kingdom Tet 784 63555 TLX 851 928855 india Hinditron Services Pvt Ltd 68 A L Jagmohandas Marg Bombay 400 006 India Tel 22 8121316 8125344 TLX 953 112326 Hinditron Services Pvt Ltd 8th Main Road 33 444 Raj Mahe Vilas Extension Bangalore 560 080 india Tet 910 33139 367289 TL X 953 845741 Hinditron Services Pvt itd 5th Floor Castle House 5 1A Hungertord St Caicutta 700 017 india Tei 33 434628 TLX 21 4153 Hinditron Services Pvt Ltd 204 5 6 Tower 98 Nehru New Deihi 110019 india Tei 910 640380 TLX 953 3161458 Hinditron Services Pvt Ltd 1 1 58 1 to 1 1 58 11 Sarojini Devi Road Secunderabad 500 003 india Tet 842 821117 TLX 853 1556973 indonesia Dwi Tunggal Jaya Sakti P O Box 4435 Wisma Harapan Bidg 14th di Jend Sudirman Kav 34 Jakarta Pusat Indonesia Tet 21 584685 TLX 796 47308 ireland e Euro Instruments amp Electronics Ltd Euro House Swords Road Santry Dublin 9 Ireland Tel 1 425666 TLX 851 31821 R D T Electronics Engineering Ltd P O Box 43137 Tel Aviv 61430 israel Tet 3 483211 TLX 922 32143 S p A Via Pelizza da Volpedo 59 20092 Cinisello Baisamo Milan Italy Tel 2 6181893 TLX 843 334643 Sistrel S p A V
87. Logic States 0 0 1 1 0 0 0 LOGIC LEVELS 1 OV 15 1 9V 10 0 14 8V 210 4 46 A D Calibration Resistor Selection 4 47 This procedure is used to determine the correct A D selected resistor R204 and should be completed whenever VR201 is replaced or when R1205 does not have enough range to calibrate the D possible values for R204 listed in Table 4 1 1 may be obtained ina set bv ordering Part 4490722 NOTE The CUT mai go into overrange with R204 removed I Place all front panel switches in the out position and set T205 the center of its adjustment range 2 Apply 100 09 mV 200 Hz to the input and select resistors R204 from Table 4 11 until the display reads closest to 100 0 3 Verify that R205 has adjustment range on both sides of the displayed 100 0 mV reading 4 Perform the instrument calibration 4 48 DC Offset Resistor Selection 4 49 Use this procedure to determine the correct DC offset selected resistors R19 ro R34 for amplifier A and or R66 or R76 for amplifier B Use the procedure when the amplifier offset cannot be adjusted to with R26 and or R72 usually because one or more of the following have been replaced 028 030 Amplifier A 9 17 set 08 010 and 012 Amplifier B 036 Q37 R46 set Q38 040 All possible values for R19 or R34 amplifier A or R66 or R76 amplifier B listed in Table 4 12 may be obtained in a set by ord
88. NOTE This manual documents the Model 8920 and 8921A True RMS Voltmeters and their assemblies at the revision shown in Appendix your instrument contains assemblies with different revision letlers it will be necessary to either update or backdate this manual Refer the supplernental change errata sheet for newer assemblies or to the backdating sheet 5008098 for older instruments 8920A 8921 ru e R M S Vo Itm ete Instruction P N 487157 October 1978 1980 John Fluke Mfg Co inc all rights reserved Litho in U S A A m amp ox A oS Table of Contents SECTION TITLE PAGE 1 INTRODUCTION AND SPECIFICATIONS 1 1 1 1 INTRODUCTION 4a du Padus i eu REO apes 1 1 1 9 SPECIFICATIONS lass S EN eee ERAS 1 2 1 11 Specifications Options Si cad d a xx CR aC ER QUU Saa a opel 1 2 2 OPERATING INSTRUCTIONS 2 1 2 1 INTRODUCTION maven org A 2 1 2 3 SHIPPING INFORMATION 2 1 2 6 INSTALLATION vow Re GARE 21 2 8 INPUT POWER IS cou od ES d PH OUR XR uq 223 X 2 10 CONTROLS AND INDICATORS 2 2 i 2 12 OPERATING NOTES cos vss cee theta m ar ER waqasa 2 4 2 14 Fuse Replacement uuu a
89. OU is valid Output 10 Eight strobes that indicate which LED is to be enabled and accept the data on lines W X Y and Z input Impedance reference selection line in dB Output Encoded range lines MSB LSB code equals range 1 voltage swings from 15 to OV Input Strobe input on this pin determines the lower range limit Input Strobe input on this pin determines the upper range limit Output Enables display decimal point input Ground OV supply 3 7 8920A 8921A Table 3 2 Controller Summary cont INPUT OUTPUT PIN PIN DESCRIPTION 22 BZ Output Indicates new data is ready for DOU occurs after CM one strobe raster long Input Enables controller ranging see Table 3 5 Output BCD data W MSB 2 LSB TTL compatible Output Drives blanking input on display decoder driver TTL compatible Input 700V range overload enable Input 15V supply Enables 3 or 4 digit display in linear mode and determines tin combination with RD the fixed reference in dB mode Input Input Test not used Input Enables dB display mode Output Enables not integrate period of A D Converter Output Enables integrate period of A D Converter Output Enables auto zero period of A D Converter Enables integrate reference period for positive input of A D Converter Output Output Enables integrate reference period for negative
90. OUBLESHOOTING 2555 n asas a 4 14 4 44 RMS Sensor Replacement 555 d eia x e 4 15 4 46 A D Calibration Resistor Selection 4 19 4 48 DC Offset Resistor Selection 4 19 5 LIST OF REPLACEABLE PARTS 5 1 5 1 INTRODUCTION wena ys mewn ui ee n e iun 5 2 5 4 HOW POOR TAIN PARTS Sud tous daa e ek ences 5 2 6 OPTION AND ACCESSORY INFORMATION 6 1 E GENERAL INFORMATION 7 1 7A 1 MANUAL CHANGE INFORMATION 1 8 SCHEMATIC DIAGRAMS 8 1 ii 8920 8921 List of Tables TABLE TITLE PAGE 1 1 8920A 8921 Option Mel E Seres etel LEN TEN OR SPA sex dul 1 2 8920 8921 Accessories for C size instruments TEM 1 2 1 3 8920A 892 bio d 1 2 1 4 8920A 8921A Option Specifications rrr 1 6 2 Rack MOUNIGE KIS Ecke vade wh ade wes ra rete E XY dues 2 1 2 2 Controls Indicators and Connectors Vivas Ra dd SX 2 3 3 1 Signal Conditioner Gain Configuration ix deus Kad GPS TEES 3 4 3 2 Controller Summary GSS haqa Qha qu EVE DRE eiie 3 7 3 3 Output
91. PTI cases into a standard equipment rack 600 5 PANEL ADAPTER KIT DIN SIZE Y2020 600 6 The 8920A 8921A can be rack mounted in a DIN size equipment rack using the Panel Adapter Kit Y2020 The kit comes complete with instructions for installing the front panel adapter onto the 8920A or 8921A 600 1 600 2 8920A 8921A INPUT FROM AMP B SCHMITT TRIGGER purse 100 mv P P TRANSFORMER TUPU eso TRIGGER OUTPUT TO REAR PANEL DC DC POWER SUPPLY Figure 603 2 Counter Output Option Simplified Schematic the calibration of the mainframe instrument 8920A or 8921A must be successfully completed The table of recommended test equipment in Section 4 lists all of the equipment necessary to check calibrate and troubleshoot the mainframe instrument Any additional equipment required to check and calibrate the 003 Option is listed in Table 603 1 If vou are unable to obtain the recommended test equipment insure that the substitute has equal or better performance specifications NOTE For the following procedures the 89204 and 8921 4 will be referred to as the Unit Under Test Table 603 1 Recommended Test Equipment EQUIPMENT RECOMMENDED E NOMENCLATURE REQUIREMENT LoUIPMENT Universai Counter 100 Hz 20 MHz Fiuke 1953A Timer Osciltoscope DC to 200 MHz 1 8 ns Tektronix 475 603 13 Performance Test 603 14 The following proce
92. Pennsylvania 91737 Use 71468 Gremar Mig inc ITT Cannon Gremar Santa Ana California 91802 industrial Devices inc Edgewater New Jersey 91833 Keystone Electronics Corp New York New York Federal Supply Codes for Manufacturers cont 91836 King s Electronics Co Inc Tuckahoe New York 91929 Honeyweil inc Micro Switch Div Freeport 91934 Miller Electric Co inc Div of Aunet Woonsocket Rhode Isiand 52194 Aipha Wire Corp Elizabeth New Jersey 93332 Sylvania Electric Products Semiconductor Products Div Woburn Massachusetts 94145 Replaced by 49956 94154 Use 94988 Wagner Electric Corp Tung Sol Div Newark New Jersey 94222 Southco Inc formerly South Chester Corp Lester Pennsylvania 95146 Aico Etectronic Products Inc Lawrence Massachusetts 95263 Leecratt Mfg Co Long Isiand City New York 95264 Replaced by 98278 95275 Vitramon Inc Bridgeport Connecticut 95303 RCA Corp Recewing Tube Div Cincinnati Ohio 95348 Gordo s Corp Bicomfieid New Jersey 95354 Methode Mfg Corp Rolling Meadows IHinois 95712 Bendix Corp Electrica Components Div Microwave Devices Plant Franklin indiana 95987 Weckesser Co Inc Chicago Illinois 96733 San Fernando Electric Mfg Co San Fernando California 96853 Gulton industries Inc Measurement and Controls Div formeriy Rustrak Instruments Co Manchester New Hampshire
93. RMS SENSOR REPLACEMENT PROCEDURE SEE A D CALIBRATION RESISTOR SELECTION SEE DC OFFSET RESISTOR SELECTION T Ri IS A RESISTOR SET R97 R105 R96 R110 A R3 IS A RESISTOR SET R19 R34 R66 R76 ORDER ORDER ORDER 489369 114504 149534 256156 335158 864115 456764 467555 467563 473645 4547 36 454751 456848 343723 101055 104091 MODEL MODEL MODEL 89526 89536 737 34 73734 89536 89536 89536 89536 89536 89536 89536 89536 89536 89536 79963 79963 MFG PART NO OR TYPE 89204 OR 89214 89204 89214 489369 114504 19002 23022 335158 464115 456764 467555 467563 473645 454736 454751 456848 343723 9 141 SECTION 4 SECTION 4 SECTION 4 omh VV 8920A 8921A 8920A 8921A CAUTION SUBJECT TO BY STATIC ELECTRICITY Figure 5 1 Detail gt SKA 8920A 8921A Final Assembly DETAIL A MPG Nus gt Sax ITEM NO A1 C200 C201 C202 C203 C204 C205 C206 C207 C208 C209 C210 C211 C212 C213 CR1 CR200 CR201 CR202 CR203 CR204 CR205 CR206 CR207 F1 H200 H201 H202 H203 H204 J1 42 J6 J101 4102 4103 4203 4301 4401 4501 4601 L200 L201 M1 MP1 _ 203 MP20h MP205 MP 206 Table 5 2 A1 8920A Main PCB Assem
94. RNING TO AVOID ELECTRICAL SHOCK HAZARD DO NOT USE EXPOSED LO INPUT LEAD CONNECTIONS ON THE MODEL 8921A UNLESS CONNECTED TO THE POWER GROUND IF COAXIAL OR OTHER EXPOSED CONNECTIONS ARE USED FOR FLOATING MEASUREMENTS A SHOCK HAZARD MAY EXIST 233 M S 2 26 The low input on the 89204 is connected to the power ground through a pair of diodes see front panel connector These diodes allow the low input terminal to float up to 400 mV rms 6V peak Their function is two fold they provide isolation between input low and power ground and they protect the operator from the possibility of hazardous voltages existing on the exposed low input connector 2 27 At first glance 400 mV of isolation does not appear significant However in most cases it provides enough isolation to prevent ground loop currents and therefore measurement errors due to ground loops 2 28 When you connect the low input of the 8920A to potential greater than 400 mV above power ground the diode pair conducts and effectively clamps the input common mode voltage 2 29 Under no circumstances should you attempt to defeat the function of the diodes Specifically the diodes should not be removed the ground return on the power cord should not be floated and an isolation transformer should not be used to power the 8920A If the diodes are defeated shock hazard will exist at the low input connector when the low input le
95. Remove R97 or R105 if installed and replace with the buss wire from the sensor kit 4 Remove R96 and R 110 if installed 5 Plug the protection diode fixture into J106 Note that the fixture is symmetrical 6 Turn RIII to its maximum counterclockwise position 7 Place all of the front panel switches to their out posiuon and apply power to the instrument 8 Select AC DC RANGE HOLD and range to the 2V range Monitor TP3 with a DVM connect a DC Calibrator to the input and apply 1 8V dc The sensor input should now be clamped by the protection circuit and TP3 should read about half the display reading 9 Turn R111 slowly clockwise and observe that the DVM and instrument display readings increase The dc voltage at TP3 should stop increasing at around 0 8 to 1 0V The instrument display should stop increasing around 1 5 to 1 99V the point at which the protection diodes clamp the input DO NOT ALLOW THE INSTRUMENT GO INTO OVERLOAD Return Ril to its CCW stop and repeat the procedure with a negative dc input Turn R11 CCW until reads about 5V and remove the calibrator and the protection diode fixture 10 Short the input select AC RANGE HOLD and step up range to the 2V range Monitor TP3 and adjust 72 for 0 1 mV dc ll Select AC DC and adjust R26 for 0 1 mV dc on 3 12 Go to the rms protection circuit calibration procedure RMS Protection Circuit Calibration and complete the steps
96. V mV 1 80 19 80 19 99 mV IED ss See Table 3 mV 10 20Hz 50 Hz 200 kHz 1MHz 2MH2 NOTE DC only measurements can also be made using the 100 Hz accuracy specification Temperature Coefficients 2 mV range 5 10 MHz 20 MHz 0 C 18 C 28 C 50 C 20 mV range and above 5 C 05 dB C Table 3 DC Accuracy 2 mV range ACCURACY 3096 or 3 dB 20 or 2 98 10 or 1 dB 5 or 5 dB 396 or 35 dB p 180 1mVv 2mV B920A 8921A 45 Table 1 3 8920A 8921A Specifications cont GENERAL INPUT DISPLAYS AUTORANGING RATE VOLTS dB READING RATE OVERRANGE INDICATION UNDERRANGE INDICATION MAXIMUM COMMON MODE VOLTAGE INPUT COMMON MODE REJECTION LINEAR ANALOG OUTPUT 8920A ONLY STORAGE TEMPERATURE OPERATING TEMPERATURE HUMIDITY RANGE MTBF POWER DIMENSIONS WEIGHT 8920A isolated BNC input floating up to 6V peak 8921A isolated dual banana plus ground jack input 5 0 3 high digit 7 segment LEDs with automatic decima point location and mV V dB RELATIVE REFERENCE and 2 MHz max The display also incorporates an uncalibrated analog meter for nulling and peaking 700 ms max range change 2 2 sec max for 6 range changes 950 ms max range change 2 9 sec max for 6 range changes 2 5 readings per second Flashes m
97. V 2 8 91nB14 1001 90558 t 5 0 22 411044 2 TW 7 A SOWA TY Ei wo qi 03447345 35443810 SONNO S3109 SEAT gt 21601 5015 ST gt 3NN 01 mL Gr E el 10 amp 6Q i hey a ass 3 _ RN 054 m I AS GAOT gt enr e 1 o a seed N t gee A mm Or TOG yed vi26g 104400 3314009 oet mw Q s 00741 LOLO 7 91 106 P A Los x AS ET 8 tbe 59 9017 9 10 TINO 92048 4 0 gt yg Cy 0013 gt d QN9 gi OZAL 60231 WA ENTS eun 6 an Par pt opm ss ei ell s 9928 e 4 X gt O Z G 7 L Q3 FCU SS da LL CA Cu uud y 5 220415 AIC 66017 y 10 LNIGd ies soro wW A in iN SSS 1152 5409 8 10 15 e 3 t ul eee E 3 va pud Ly QM 3 a 9 15 24 4404 5 x A IQ 9 kati S3 2 wana hse lt gt 2010 ASI GAIT gan SI e sagte lt 6 01 WC D 57017 wey A 29 K 200 50 80141 v E
98. ad is floated above 30 volts i WARNING TO AVOID ELECTRICAL SHOCK HAZARD DO NOT REMOVE OR OTHERWISE DEFEAT THE INPUT DIODE PAIR 2 30 IMPEDANCE MATCHING 2 31 Two types of ac voltage measurements are typically made those involving matched impedance systems and those where voltmeter loading is minimized high impedance measurements and no impedance matching occurs 2 32 On the other hand when matched impedance systems are measured the impedance should be determined as close as possible to the 8920A 8921A input thereby minimizing input inductance and enhancing accuracy at high frequencies This is accomplished by including the meter as an integral part of the circuit as shown in Figure 2 3A Notice that the integrity of the 500 system is maintained by using a 500 power divider An alternate solution is shown in Figure 2 gt 3B In this case the source is alternately connected to the 8920A and the test circuit This allows the source to be adjusted to a known level before being connected to the test circuit Since both the meter and the test circuit are 500 loads the circuit integrity is maintained 2 33 High impedance measurements are based on the assumption that the voltmeter s fixed 10 input resistance and low input capacitance will not appreciably load or otherwise affect the circuit being measured If open leads are used to hold down input capacitance and the measurement frequency is low this assumption h
99. and a schematic if applicable 6 4 The location of a particular subsection is facilitated by the use of unique page and paragraph numbering which corresponds tothe option or accessory in question For example a 600 X series identifies the general accessories subsection and a 604 X series identifies the subsection for the 004 option where X is the individual page or paragraph number 8920A B921A OPTION MODEL NO 003 004 6 2 8920A 8921A TABLE OF CONTENTS DESCRIPTION PAGE Vae piu Drap Require ce Ae ss d 600 1 OPTIONS Counter Output ues oes Le wer ER NU 503 1 Logarithmic Analog Output Option 604 1 603 1 INTRODUCTION 603 2 The 003 Counter Output Option converts an rms input signal into an isolated 100 mV peak square wave suitable for triggering a counter There are several advantages as opposed to using separate inputs for the and the counter First the 8920A 8921A autoranged input has a much greater range than a counter This means that input sensitivity is increased to 180 uV while on the other hand inputs as large as 700V rms will not overload the counter In practice inputs should be 1 8 mV or greater due to possible false triggering effects of noise riding on lower level inputs Secondiv because the counter output is isolated frequency sources as high as 500V
100. as listed Return to step 13 below 13 Perform calibration steps through Ic as listed in Table 4 7 Low and Midband Accuracy Adjustments Should RIO not have enough adjustment range substitute one of the kit resistors 15 30 1 or 45 3 for 105 if reading is too high R97 if reading is too low or zero 14 Monitor the ac voltage at TP5 with a DVM and apply 100 mV 20 Hz to the input with the instrument in the 200 mV Range 15 If the monitored ac voltage is 36 0 mV or greater install the 402 resistors for R96 and R110 16 If the monitored ac voltage is still 36 0 mV or greater install the 158 resistors for R96 and RIIQ 17 If the UUT is operating correctly repeat the entire CALIBRATION procedure otherwise return to beginning of Table 4 9 For PCB Assembly Rev A monitor 9 cathode or J501 pin 3 For AC PCB Assembly Rev A solder R96 and R110 piggyback on R107 and R108 4 15 8920A 8921A Table 4 9 8920A 8921A Troubleshooting Procedure INSTRUCTION ves wo GOTO All front panel switches should be in the out position Connect the UUT 8920A 8921 A to appropriate line power and observe the display Does display light correctly Apply 1V ac input to UUT select AC function VOLTS display mode and AUTORANGE Does UUT respond to input Does UUT pass the Low Midband Check v Does UUT pass the Low Level DC Check Does UUT pass
101. aximum allowed reading for that range Flashes decimal point but continues to display the reading 8920A 400 mV rms or 600 mV peak 8921A 500V rms or 700V peak gt 80 dB 50 or 60 Hz with 100 ohms in either lead Each range provides a linear output with 2V dc equal to 2000 counts on the readout 1 0 of reading relative to display essentially 0 ohm output resistance into gt 10 load non isolated with output common the same as input common provided only on the 88204 40 to 75 0 C to 50 80 RH Greater than 10 000 hours 100V 10 120V 10 220V 10 or 240V 10 to 250V ac max selected by internal switches 45 to 440 Hz 10 W max 40 3 cm 12 9 in long X 20 3 cm 8 0 in wide X 10 8 cm 4 3 in high 2 47 5 Ib 7 1 5 8920 8921 8920A 8921A Table 1 4 8920A 8921A Option Specifications OPTION 003 COUNTER OUTPUT OPTION OUTPUT VOLTAGE 100 mV peak square wave OUTPUT IMPEDANCE 50 ohms MAXIMUM ISOLATED LEVEL 500 volts ac COMPATIBILITY 8920A and 8921 OPTION 004 LOGARITHMIC ANALOG OUTPUT OPTION 8920A ONLY OUTPUT VOLTAGE DC 200 rms input 0 dB OV dc out 700V rms input 131 dB 13 1V dc out Le 100 mV 1 dB LINEARITY Within each Range 0 35 dB Over all seven Ranges 2 dB OUTPUT IMPEDANCE 1 COMPATIBILITY 8920A ONLY YN F ario arai aware ness A Message From
102. ays V with the dB VOLTS switch in the VOLTS position 3 Depress the dB VOLTS switch in 4 Depress the REL dBm switch in This vstablishes the voltage V as the 0 dB reference level Therefore subsequent dB measurements will be equivalent to dBm measurements as long as the system impedance R is maintained NOTE This reference will hold as long as the REL dBm switch is not released and the instrument is turned on 2 8 8920A 8921A 2 68 Linear Analog Output 2 69 We have provided a pair of banana jacks on the rear of the 8920A for accessing a linear dc analog output signal This signal is proportional to the applied input signal and is linearly scaled a 2V dc output is equal to 2000 counts on the display The scale is repeated for each range so that a continuously increasing input spanning the entire 180 uV to 700V capability of the 8920A results is a seven cycle sawtooth output Output accuracy is 1 relative to the front panel reading The output signal is buffered and is suitable for driving an external analog meter recorder plotter scope etc 2 70 OPERATION 2 71 With reference to the preceding paragraphs use the following procedure to turn on and operate the Model 8920A 8921A refer to Section 6 for option and accessory information Connect the 89204 8921 to line power 2 Set the front panel POWER switch to ON in The front panel display should light 3 Select the appropriate input l
103. ble 4 4 8920A ONLY REAR DVM 8600A 8920A 8921A FRONT WHEN TESTING THE 8920A A BANANA TO BNC ADAPTER MUST BE USED POMONA 1296 Figure 4 1 Low and Midband Performance Test Set Up 4 3 8920A 8921A Table 4 3 Low and Midband Performance Check Volts Display Mode 2mV 1 000 AC 1 9 mV 500 AUTORANGE COMMENTS Select the LO RANGE ENABLE and note that the mV and 2 MHz max annunciators are lit AUTORANGE De energize the LO RANGE ENABLE and note that the mV annunciator is lit AC Note that the mV annun AUTORANGE ciator remains lit Verify that display flashes 1 999 signifying overrange AC HOLD Measure 1V on the linear analog output 8920A only Note that the test instru ment s reading is within 3 017 of UUT s displayed reading HOLD AC HOLD Measure 0 2 on linear analog output 8920A only Note that the test instru ment s reading is within 002 of UUT s displayed reading AC HOLD Verify that decimal flashes signifying below 996 of range AC AUTORANGE Note that the V annunciator is lit AC AUTORANGE Note that the V annunciator remains lit AC AUTORANGE Note that the V annunciator remains lit AC Note that the UUT auto ranges down
104. bly DESCRIPTION MAIN PCB ASSEMBLY 8920A 4001 FIG 5 2 DISPLAY ASSEMBLY 89204 8921A FIG 5 l CAP PLYPRP O 47 UF 10 100V 0 47 UF 20 35 150 PF 5 500V CAP PLYSTR 0 22 UF 10 100V CAP CER 10 000 PF 20 100V CAP CER 10 000 PF 20 100 CAP MICA 470 PF 5 500V CAP MICA 3000 PF 5 500V CAP ELECT 220 UF 10 475 35V CAP ELECT 220 UF 10 75 35V CAP ELECT 220 UF 10 4754 35 ELECT 4700 UF 10 100 15 CAP CER 10 000 PF 20 100V CAP CER 10 000 PF 20 100V RECTIFIER BRIDGE 50V 25 DIODE MULTI PELLET DIODE HI SPEED SW DIODE HI SPEED SW DIODE HI SPEED SW RECTIFIER BRIDGE RECTIFIER BRIDGE DIODE HI SPEED SW DIODE HI SPEED SW FUSE SLO BLO SCREW ST 8 40 X 1 4 WASHER LOCK STEEL F 4 NUT 4 40 HEX STEEL SCREW PHP 6 32 THD 5 8 L NUT 6 32 LOCKING HEX STEEL CONNECTOR BANANA JACK BLACK CONNECTOR BANANA JACK RED CONNECTOR FEMALE BNC 8920A ONLY SOCKET IN LINE SOCKET IN LINE SOCKET IN LINE CONN PWR CONN MATING POST CNTACT POST CNTACT POST CNTACT CHOKE 6 TURN CHOKE RF METER ANALOG PANEL BRACKET SWITCH MOUNTING BRACKET METER MOUNTING BRACKET PUSH RCD KNOB SKIRTED SHIELD TRANSFORMER 161349 148478 436113 149153 149153 148429 161786 460279 460279 460279 46026 1 149153 149153 473520 375477 203323 203323 203323 296509 296509 203323 203323 166488 2
105. common mode voltage above earth ground be measured with the 8921A Third only one probe is needed to make a simultaneous voltage and frequency measurements The counter option is available on both the 8920A and 8921A 603 3 SPECIFICATIONS 603 4 Specifications for the Counter Output Option are given in Section 1 of this manual 603 5 INSTALLATION 603 6 The Counter Output Option may be installed on either the 89204 or the 8921A Install the Counter Output Option as tollows referring to Figure 603 1 L Remove 8920A 8921A top cover see Access Information 2 Plug Counter Output Option into 106 1 Ji06 3 of the A2 AC PCB Assembly and mechanically secure with the three screws provided one onthe AC Assembly shield and two onthe rear panel 003 Option Counter Output 3 Connect the 3 wire cable P401 to J401 on the Main PCB Assembly A 4 Verify operation using the calibration procedure 5 Replace the shields 603 7 OPERATION 603 8 Once installed the Counter Output Option requires no operator attention other than ensuring that no voltage is ever applied to the option s rear panel BNC output J402 603 9 THEORY OF OPERATION 603 10 As shown in Figure 603 2 the Counter Output utilizes an isolation amplifier two Schmitt triggers pulse transformer and a DC DC power supply to nrovide an isolated output suitable for triggering a counter The isolation amp is used as a buffer between amp
106. dure will verify that the Counter Output Option is operating within the specification limits stated in Section 1 Connect the AC Calibrator UUT oscilloscope and termination as shown in Figure 603 3 2 Setthe AC Calibrator to its 10V range set the UUT to AC FUNCTION VOLTS DISPLAY MODE and 2V range HOLD and set the oscilloscope s time base to 0 2 sec div and Vert on 50 mV div 3 Referring to Table 603 2 change inputto UUT as indicated and note that display values are within indicated tolerances 4 Disassemble the setup as shown in Figure 603 3 and connect the 50503 UUT and Universal Counter Timer and terminations as shown in Figure 603 4 5 Set the SG503 to its 10 25 MHz range set the Universal Counter Timer for frequency ratio measurement with 10 sec gate interval and set the UUT to AC FUNCTION VOLTS DISPLAY MODE and 200 mV RANGE HOLD 6 Referring to Table 603 3 change inputto UUT as indicated and note that display values are within indicated tolerances 603 3 8920A 8921A BANANA TO BNC ADAPTER AC CALIBRATOR FLUKE 5200A UUT FRONT COUNTER OUTPUT OSCILLOSCOPE TEKTRONIX 475 THIS ADAPTER IS NOT REQUIRED WHEN USING THE 89214 Figure 603 3 Counter Output Performance Set Up UNIVERSAL COUNTER TIMER FLUKE 1953A LEVELED SINE WAVE 500 GENERATOR UUT mn 56503 D gt REAR A INPUT BNC TO GR ADAPTER UUT GR TO BNC ADAPTER iF THE 892
107. e UUT is increased up to 18V calibrated when it is first installed or if the limits as stated in the performance test cannot be met Use the following 5 Disassemble the set up as shown in Figure 603 procedure to calibrate the Counter Output Option Hit is 3 connect the 50503 UUT Universal Counter not possible to obtain the limits as stated in the tollow Timer and terminations as shown in Figure 603 5 COUNTER TP LEVELED UNIVERSAL SINE WAVE gg COUNTER TIMER GENERATOR FLUKE 1953A TEK SG503 e UUT TERM Em Je REAR A INPUT BNC TO GR B INP ADAPTER di aes 20dB e 2 UUT FRONT ae BN GR L IF THE 8921A IS USED A BANANA ADAPTER ADAPTER WILL ALSO BE REQUIRED ae Figure 603 5 Calibration Set Up 603 5 8920A 8921A 6 Set the SG503 to its 10 25 MHz range set the Counter Timer for frequency ratio measurement with a 10 sec gate interval and set the UUT to AC FUNCTION VOLTS DISPLAY MODE and 200 mV range HOLD 7 Select a 20 MHz output on the 50503 and adjust its amplitude with the vernier control until the UUT reads 18 0 mV Atthis point the Counter Timer should display a stable reading of 1 00000 digit 8 Reduce the output amplitude of the 50503 until the Counter Timer display limit of step 7 cannot be met 9 Adjust R404 until the Counter Timer display limit of step 7 is met 10 Repea
108. eads and connect them to the meter s input terminals Add terminations as close as possible to the input connectors if impedance matching is required 4 Select input coupling by setting the FUNCTION switch to AC DC im as desired 5 Select the desired range Use automatic or manual method as desired 6 Setthe DISPLAY switches to select the desired measurement mode volts dB or dBm If dB is selected establish a 0 dB reference 7 Observing safety considerations connect the test leads to the measurement points The results are displayed on the 8920A 8921A readout 3 1 INTRODUCTION 3 2 Theinformation we have compiled in this section is the theory of operation of the 8920A and the 8921A True RMS Voltmeters The theory has been divided into two major headings Overall Functional Description and Detailed Block Diagram Description To gain maximum benefit from this section we recommend that vou read each paragraph in the order presented while referring to the associated figure or the appropriate schematic in Section 8 3 3 OVERALL FUNCTIONAL DESCRIPTION 3 4 As vou can see in Figure 3 1 the circuitry of the 8920A and 8921A can be divided into two sections ANALOG CIRCUITRY INPUT Hi SIGNAL CONDITIONER INPUT LO 5 DISPLAY CONTROLLER CONVERTER Section 3 Theory of Operation analog and digital An overall functional description of these two sections i
109. ering Part 490730 Two sets will be necessary if both amplifiers require the same selected resistor value 4 50 SET UP l Remove the cover HUP of the AC Converter PCB 2 Connect a short jumper between input low and the metal fence on the AC Converter PCB 4 5 AMPLIFIER B must be done before Amplifier A 3 Apply power short the input select AC RANGE HOLD and step up to the 2V range 4 Set R72 to the center of its adjustment range and monitor TP3 with DVM 5 Select resistors from Table 4 12 starting with the highest value until the DVM reads closest to 0 volts dc Place the resistor in the socket for R66 if the DVM reads positive R76 if the reading is negative Adjust R72 for a DVM reading of less than mV dc at TP3 24 19 8920A 8921A 4 52 AMPLIFIER A 6 Select AC DC set R26 to the center of its adjustment range and monitor TP3 with a DVM 7 Select resistors from Table 4 12 starting with the highest value until the DVM reads closest to 0V Table 4 11 R204 Resistive Values mF 5196 1 8W VALUE VALUE 71 5K 4 20 8920 8921 dc Place the resistor in the socket for R19 if the DVM reads positive R34 if the reading is negative 8 Adjust R26 for a DVM reading of less dc at TP3 9 Perform the complete instrument calibration Table 4 12 R19 R34 R66 R76 Resistive Values mF 1 1 8W TABLE OF CONTENTS TITLE TABLE 8920A
110. esota 75042 TRW Electronics Components IRC Fixed Resistors Philadelphia Pennsylvania 75376 Kurz Kasch inc Dayton Ohio 75378 CTS Knights Inc Sandwich 7 6 Federal Supply Codes tor Manufacturers cont 75382 Electric Corp Mount Vernon New York 75815 Littlefuse inc Des Plaines 76854 Oak Industries Inc Switch Div Crystal Lake Illinois 77342 Inc Potter amp Brumfield Div Princeton Indiana 77638 General Instrument Corp Rectifier Division Brooklyn New York 77968 Rubbercraft Corp of CA LTD Torrance California 78189 Shakeproof Div of Hlinois Tool Works Inc Elgin illinois 78277 Sigma Instruments Inc South Braintree Massachusetts 78488 Stackpole Carbon Saint Marys Pennsylvania 78553 Eaton Corp Engineered Fastener Div Tinnerman Plant Cleveland 79136 Waides Kohinoor inc Long island City New York 79497 Western Rubber Company Goshen indiana 79963 Zierick Mfg Corp Mt Kisko New York 80031 Eiectro Midiand Corp Mepco Div A North American Phillips Co Norristown New Jersey 80145 LFE Corp Process Control Div formerly API Instrument Co Chesteriand Ohio 80183 Use 56289 Sprague Products North Adams Massachusetts 80294 Bourns inc instrument Div Riverside California 80583 Hammariund Mfg Co Inc Red Bank New Jersey 80640 Arnold Stevens Inc South Boston Massac
111. greater than 10 mA is the resistance of U1 6 to 01 7 J106 2 to J106 3 90 ohms 4856 Out of circuit resist ance 100 ohms 489 Is the resistance of U1 8 to U1 9 J106 4 to 2106 3 100 ohms 8 Check U2 UA U5 Check test point is it at 1V 45 Check meter and U210B Check VR201 Check VR202 Check U203 through 0207 Check TP1 15 TPT at 0 045V 410 Check TP2 15 voltage on TP2 at 0 045V 41099 Check Amp B Refer to the AC Amplifier schematic for voltage check points Replace rms sensor refer to RMS Sensor Replacement Procedure Check U201A Check Q3 04 Q5 and Q6 refer to Table 4 10 are they switching properly Check Amp A Refer to the AC Amplifier schematic for voltage check points Check Q31 Q32 and Q33 4 17 8920A 8921A A D WAVEFORMS GENERAL CONDITIONS 8920A 8921A READING 1000 COUNTS SCOPE TRIGGERED ON SLOPE OF A2 PIN 38 X10 SCOPE PROBE 10 36 INT TP 203 INTEGRATOR QUTPU CM PIN 2 07205 4 4 gt 1 i gt amp gt i ray i GND t i i i i i i i H i i i 1 PIN 8 U200 PROS E WILL LOA INPUT i 1 2 Div 02v Div 50ms DIV B Figure 4 8 A D Waveforms General Condition 4 18 8920A 8921A mM Table 4 10 Attenuator
112. h St Suite 9 Bloomington MN 55420 612 854 5526 MO St Louis John Fiuke Mfg Co Inc 2029 Woodland Parkway Suite 105 St Louis MO 63146 314 993 3805 NC Greensboro John Mfg Co Inc 1310 Beaman Place Greensboro NC 27408 919 273 1918 NJ Paramus John Fluke Mfg Co inc P O Box 930 Paramus NJ 07653 0930 West 75 Century Road Paramus NJ 07652 201 262 9550 NY Rochester John Fiuke Mfg Inc 4515 Culver Road Rochester NY 14622 716 323 1400 OH Cleveland John Fluke Mfg inc 7830 Freeway Circie Middleburg Heights OH 44130 216 224 4540 Columbus 614 889 5715 Dayton John Fluke inc 4756 Fishburg Rd Dayton OH 45424 513 233 2238 PA Malvern John Fiuke Mfg Co Inc 200 Lindenwood Drive Malvem PA 19355 215 647 9550 TX Dallas John Fluke Mfg Co inc 1801 Roya Lane Suite 307 Dallas TX 75229 214 869 0311 San Antonio John Fluke Mfg Inc 10417 Gulfdale San Antonio TX 78216 512 340 1011 Seattle John Fiuke Mfg Co Inc 5020 148th Ave N E Suite 110 Redmond WA 98052 206 881 6966 Service Center Areas CA Burbank 213 849 7181 CA Santa Clara 408 727 0513 CO Denver 303 695 1000 FL Oriando 305 896 4881 IL Chicago 312 392 9510 MA Billerica 617 663 2400 MD Rockville 301 770 1570 NJ Paramus 201 262 9550 TX Dallas 214 869 0311 WA Everett 206 356 5560 For more information on F
113. he test equipment recommended for these checks Should the UUT fail to meet the requirements of these checks calibration and or troubleshooting will be necessary Before starting the performance checks allow the UUT and the required test equipment to warm up for at least 30 minutes in an environment of 23 5 C with relative humidity less than 80 LINEAR ANALOG OUTPUT AC CALIBRATOR 5200A NOTE NOTE In all of the procedures in this section precautions should be taken to minimize ground currents stray fields eic 4 15 Low and Midband Performance Check Volts Display Mode 4 16 This procedure will verify that the UUT s low and midband performance is within the limits specified in Section Set up the test equipment as shown in Figure 4 1 and select the required function and input signal as indicated in Table 4 3 Note any deviation between the UUT performance and the specified limits 4 17 dB Display Mode Check 4 18 This procedure will verify that the UUT s dB display mode is functioning properly Set up the test equipment as shown in Figure 4 1 Depress RANGE HOLD and step up to the 2V range Select the IV range on the AC Calibrator and adjust its output for 1 000 on the UUT s display Select the dB display mode and switch through the dBm REFERENCE selection switch checking the reading at each position against Table 4 4 The readings should not differ by more than 1 digit from the numbers given in Ta
114. husetts 81073 Grayhill Inc La Grange Hiinois 81312 Winchester Electronics Div of Litton industries inc Oakvilie Connecticut B1483 Therm O Disc Inc Manstieid Ohio 81483 international Rectifier Corp Los Angeles California 81590 Korry Mtg Co Seattle Washington 81741 Chicago Lock Co Chicago lilinois 82305 Palmer Electronics Corp South Gate California 82389 Switchcraft Inc Chicago Illinois 82415 North American Phillips Controls Corp Frederick Maryland 82872 Roanwel Corp New York New York 82877 Rotron inc Woodstock New York 82879 ITT Royal Electric Div Pawtucket Rhode island 83003 Varo inc Garland Texas 83058 The Cart Co United Can Div of TRW Cambridge Massachusetts 83298 Bendix Corp Electric Power Div Eatontown New Jersey 83330 Herman H Smith Inc Brooklyn New York 83478 Rubbercraft Corp of America inc West Haven Connecticut 83594 Burroughs Corp Electronic Components Div Plainfield New Jersey 83740 Union Carbide Corp Battery Products Div formerly Consumer Products Div New York New York 84171 Arco Electronics Great Neck New York 84411 TRW Electronic Components TRW Capacitors Ogatlala Nebraska 84613 Fuse Indicator Corp Rockville Maryland 84682 Essex International inc Industrial Wire Div Peabody Massachusetts B6577 Precision Metal Products of Maiden Inc Stoneham Massach
115. ia Giuseppe Armellini No 39 00143 Rome Italy Tet 6 591 5551 843 680356 Sistret S p A Via Cinta Parco S Paolo 35 80126 Naples Italy Tel B1 7679700 Japan John Fluke Mtg Co inc Japan Branch Sumitomo Higashi Shinbashi Bldg 1 1 11 Hamarmatsucho Minato ku Tokyo 105 Japan Tel 3 434 0181 TLX 781 2424331 FAX 81 3 434 0170 John Fluke Mfg Co inc Japan Branch Katsushige Building 2 45 Kohraibashi Higashi ku Osaka 541 Japan Tel 6 229 0871 FLUKE John Fluke Mfg Co Inc PO Box C9090 Everett WA 98206 206 356 5400 Litho in U S A 11 85 INTERNATIONAI SAI FS OFFICES k LORE A Korea Republic ot Myoung Corporation Rm 1501 Sinsong Bldg 25 4 Yeouido Dong Young Deung Po ku Seoul 150 Korea Tet 2 784 9942 TLX K24283 Kuwait A Bahar Imernatonal Group Box 26672 Safat Kuwait Arabian Gulf Tei 848601 847598 TLX 959 44822 Lebanon snd Jordan s Mabek Electronics Division P O Box 13 5657 Beirut Lebanon Tet 812523 TLX 923 22889 Malaysia 9 Mecomb Malaysia SND BHD Lot 20 Jalan 225 P O Box 24 Petaling Jaya Malaysia Tel 3 743422 TLX 784 MA37764 Malta a Fat an Enterprises 20 Msida Road Gzira Malta Tet 513283 40216 TLX 838 1837 Mexico industrial S A Diagonal No 27 Entre Calle de Eugenia Y Ave Valle CP 03100 Me
116. ill be referenced to the voltage present at the time the switch was pressed When AUTO is selected on the AUTO HOLD switch the out position the autorange mode selects one of seven input ranges to optimize the display Section 1 Introduction amp Specifications 1 5 Complementing the instrument s high digital resolution is an anlog panei meter for use in applications that require peaking or nulling This meter does not have calibration markings since it is intended for peaking and nulling indications only 1 6 Note that both the 8920A and 8921A accomodate floating measurements The 8921A safely accepts common mode inputs up to 500V rms or 700V peak An isolation circuit allows the 8920A input low to float up to approximately 0 6V peak with respect to earth ground Isolation of 0 6V peak will accomodate the few hundred millivolts oftypical common mode voltage Full operator protection is still maintained since under fault conditions the diode isolation circuitry conducts and insures that the common mode voltage is never greater than one diode drop 1 7 Several options and accessories are available for use with the 89204 and 8921A The options and accessories are listed and described in Table 1 1 and Table 1 2 They may be ordered for factory or field installation Detailed information concerning each option and accessory is given in Section 6 of this manual Table 1 1 8920A 8921A Options OPTION DESCRIPTION COMMENT 8920A
117. ing procedure to condition the instrument for use with the local line power 1 Disconnect the instrument from the line power and remove its top cover four screws onthe bottom of the unit hold the top cover in place 2 Locate the power selection switches S209 and 5210 as shown in Figure 4 5 3 Refer to Table 4 2 and set switches S209 and 5210 for desired line voltage 4 Install the top cover before connecting the unit to line power 4 9 Cleaning 4 10 Clean the front panel and case with denatured alcohol or a mild solution of detergent and water Clean dust from the interior of the instrument with dry low pressure air 20 psi Contaminants can be washed from the circuit board with demineralized water and a soft brush avoid getting excessive amounts of water on the switches CAUTION Do not use aromatic hydrocarbons or chlorinated solvents for cleaning These solutions will react with the plastic materials of the instrument 8920 8921 Tabie 4 1 Recommended Test Equipment REQUIREMENT RECOMMENDED EQUIPMENT EQUIPMENT NOMENCLATURE John Fluke 5200A amp John Fluke 5205A 19 mV to 600V 20 Hz 50 Hz 0 2 50 Hz 50 kHz 0 1 Precision AC Calibrator and Power Amplifier DC Voltage Calibrator 0 5 t3 uV John Fluke 341A AC Component 100 uV Tektronix SG 503 Series 500 Mainframe Short term stability drift and adjustment reso
118. input of A D Converter not used VOLTS NON LINEAR Op oc MAIN COUNTER iNT AZ AD DATA BB CONTROL LATCHES DE R DE i Rj 40 DE R ADD SUB REFERENCE LATCHES CM 8920 LSI REFERENCE RANGE IMPEDANCE AND STROBE DATA POLARITY FRONT PANEL COMMANDS DE amp F Figure 3 7 Controller Functions 8920A 8921A Tabie 3 3 Output Range Codes DATA LINES Table 3 4 Over Underload Conditions Overload 219998 25 30 20V range except for 700 700V range gt 700 a 56 10 Underload lt 180 4 30 20V range minimum input 132 1 60 20V range for accurate dB conversion dB calculations are based on a 1200 ohm reference impedance and 20V range The calculation is then corrected for the proper range and the selected impedance by the addition of the appropriate constant which may be calculated from the following equation 20 tog 1 2 20 log V 0 001R N 20 Where N number of ranges above or below the 20V range i e 2 mV range N X4 Table 3 5 Input Range Codes COMMAND LINES 8920 CONTROLLER FUNCTION Auto range fast range cycle Hold present range loverridden by a amp Range up at CM time over ridden a amp f 3 28 The 2 mV range will not be selected by autoranging unless the LORANGE ENABLE switch is selected If the low range is enabled and the instrument e
119. its as stated in the following procedure then the option will require troubleshooting If however the limits are met then we recommend that the performance test be completed as a check 1 Remove the 8920A s top cover and set up the test equipment as shown in Figure 604 3 2 Setthe 8920A to AC AUTO and select the LO RANGE ENABLE Now apply 1 0 mV ac 500 Hz Observe the option s output to be approximately 1 4 x 0 2V dc 504 is Ground TP503 is the option s output 604 3 8920A 8921A SHIELDED AC CALIBRATOR 5200A BANANA TO BNC ADAPTER NOTE THE OUTPUT HIGH 1 THE RIGHT WHEN THE 8920A iS VIEWED FROM THE REAR FRONT Figure 604 3 Logarithmic Analog Output Option Test Set Up 3 Apply 20 0 500 Hz to the 8920 and select its HOLD RANGE Monitor the voltage at TP502 and adjust R501 for a 0 10 0005 Vdc on the DMM 4 Monitor TP501 and note the magnitude and polarity of the offset from OV to the nearest 0 01 V 5 While still monitoring TP501 adjust R512fora reading of 10V OFFSET of step 3 0 01 Example 604 4 Initial Offset 03V 10 03 10 03 01V 14V 10 14 9 86 01 Final Reading 6 Monitor TP503 and note the offset from 6 00V to the nearest 0 0 7 Decrease the input to 100 mV 500 Hz and observe that the DMM reads 5 4V 0 01V plus the offset noted in step 5 8920 8921 8 Decrease the input to 20 mV 500 Hz and observe
120. l continue until either CM or the end of the 100 msec 71 occurs 3 24 Controller 3 25 The Controller Is custom 151 that controls autoranging the D Converter and the Display and Annunciators In addition the Controller can count ina non linear dB scale and display its count in dB units The A D Converter has alreadv been described and the Display and Annunciators will be described immediately after this section on the Controller A summarized description of each input and output pin sed on the Controller is give in Tabie 3 2 and shown in Figure 3 7 3 26 AUTORANGING 3 27 Autoranging is the automatic selection of the instrument s range by the Controller With the low range enabled the instrument may range through seven voltage ranges from 2 mV to 700V rms Autoranging also applies in the dB modes but gives the effect of a single range spanning 132 dB By coding the logic levels on the three lines FO Fl and F2 the Controller selects a range see Table 3 3 Output Range Codes by setting up the circuit conditions of the input and intermediate attenuators and amplifier A that are necessary for signal conditioning in that range See Table 3 I Signal Conditioner Gain Configuration If the Controller senses that the input is above or below the selected range see Table 3 4 Over Underload Conditions it shifts up or down one range depending upon the direction sensed and halves its cycle time The Con
121. l specifications given assume an operating temperature of 23 C 5 C relative humidity up to 8096 AC true RMS AC DC true RMS Digital Display Panel selectable for volts or dB analog peaking nulling meter Autoranging Hold to defeat Autoranging step up for manual up ranging Ranging up at 2000 counts Ranging down at 180 counts 700V rms or 1000V peak not to exceed 1 X 10 volts Hz product on any range True RMS thermal converter will accept sine complex pulse or random waveforms 1 6 seconds typically to rated accuracy within a range composed of 1 second settling time and 0 6 seconds maximum digitizing time 2 mV to 700V range 10 MQQ shunted by lt 30 pF 7 at full scale increasing down scale by 7 X V range V input 2 mV range 2 MHz maximum 20 mV 20V range 20 MHz maximum 200V 700V range 1 MHz maximum 2 mV 20 mV 200 mV 2V 20V 200V and 700V 0 05 of range he Ces Tabie 1 3 8920A 8921A Specifications cont ELECTRICAL dB Display Mode dB RANGE inthe autorange mode the instrument appears as though it has a single range spanning 132 dB Transients will appear in the readout as the transition through which the analog voltage range points occur dB RANGE REFERENCES dBm REFERENCES Twelve manually selectable impedances with which to ref erence a 0 dBm 1 mW signal level i
122. librated every 90 days to maintain the specification given in Section of this manual If instrument repairs have been made or if the unit fails any of the performance checks calibration is required Use the test equipment as listed in Table 4 1 4 27 Use the following procedures to calibrate the 8920A or 8921 Access to all calibration and test points INPUT MO cus Levet LIMITS DISPLAY or COUNTS 10 00 test COMMENTS Use the 5205A for this see Figure 4 5 may be obtained by removing the top cover see Access and Removal The UUT should be allowed to warm up for 30 minutes before calibration 4 28 Power Supply Calibration WARNING IN ALL PROCEDURES WITH THE TOP COVER REMOVED THE OPERATOR SHOULD BE AWARE THAT THE FOLLOW ING POINTS ARE AT LINE POTENTIAL 1 POWER LINE CONNECTOR ALL LAND PATTERNS NEAR POWER TRANSFORMER POWER SWITCH FUSE HOLDER 4 29 Use the following procedure to calibrate the power supplies of the UUT l Place ali front panel switches to the out position CAUTION Certain overload protection depends on the supply voltages To avoid possibility of damage do not adjust the 15V supplies with the UUT in overrange 2 Monitor TP206 with a DVM using TP205asa voltmeter common 3 Adjust R229 for 15V 0 1V on TP206 4 Check TP208 for 15V 0 2V 5 If TP208 does not comply recheck TP206 and adjust R229 if necessary 6 Check TP207 for 5V 0 25 4
123. lifier B s output and the first Schmitt trigger The Schmitt trigger drives the pulse transformer with a square wave at the same frequency as the sine wave input The pulse transformer provides isolation between the input common and output common allowing frequency sources with as high as 500 common mode voltage to be measured with the 8921A The second Schmitt trigger is used to convert the pulse transformer output to the 100 mV square wave output at the same frequency as the sine wave input The DC DC power supply provides isolated 5 3V and 6 5 for the second Schmitt trigger 603 11 MAINTENANCE 603 12 The following maintenance information covers three areas performance testing calibration and troubleshooting of the 003 Counter Output Option However before any of these procedures can be started 603 1 8920A 8921A COUNTER OUTPUT OPTION TESTED fU Figure 603 1 Counter Output Option Installation 603 2 8920A 8921A 600 1 RACK MOUNTING KIT SINGLE Y2014 600 2 The 8920 8921 can be rack mounted in standard 19 inch equipment rack using Rack Mounting Kit Y2014 The kit comes complete with installation instructions 600 3 RACK MOUNTING KIT DOUBLE Y2015 600 4 The 8920A 8921A can be rack mounted side by side in a standard 19 inch equipment rack using Rack Accessories Mounting Kit Y2015 The kit comes complete with instructions for installing any two C size
124. ltage in units of volts you must set the dB VOLTS switch to VOLTS The instrument will now display all input in units of volts or millivolts as indicated by the front panel annunciators V mV 2 52 couple of points of interest about the volts display mode are as follows one if the input is completely unknown allow the autoranging circuit to select the appropriate range Two the selection of the volts display mode will not affect previous reference established in the dB display mode see following paragraphs for additional information about establishing a dB reference 2 53 dB Display Mode 2 54 When the instrument is in its dB display mode all voltage inputs are referenced to a selected level and displaved as deviations in dB above or below that level If vou wish to display the input voltage in dB units you need only to set the dB VOLTS switch to dB The instruments front panel dB annunciator will now light indicating to you that the display is presenting a measurement in dB units 2 55 Like the voltage display mode there are points about the dB display mode of which you should be aware The instrument references all inputs to a selected level therefore before a meaningful measurement in db units can be made the desired reference level 0 dB must be established see RELATIVE REFERENCE Selection and dBm REFERENCE 2 56 dBm Measurements 2 57 Measurements made to a fixed
125. luke products or Sales Offices you may dial 800 426 0361 toll free in most of the U S A From Alaska Hawaii or Washington phone 206 356 5400 From Canada and other countries phone 206 356 5500 John Fiuke Mfg Co inc Box C9090 Everett WA 98206 in Fiuke Holland B V P O Box 2269 5600 CG Eindhoven The Netherlands Phone 040 458045 TLX 51846 Litho in U S A 11 85 U S SALES AREAS for all Fluke products mmm w w ON W Ra Argentina Coasin S A Virrey del Pino 4071 DEP E 1 1430 CAP FED Buenos Aires Argentina Tel 1 552 5248 TLX 390 22284 Australis Elmeasco instruments Pty Ltd P O Box 30 Concord N S W 2137 Australia Tel 2 736 2888 TLX 790 AA25887 Eimensco instruments Pty Ltd Box 623 12 Maroondah Highway Ringwood Victoria 3134 Australia Tet 3 879 2322 TLX 790 AA36206 Elmeasco Instruments Pty Ltd Protessionat Suites Bidg G P O Box 2360 Brisbane 4001 Australia Tel 7 369 8688 TLX 790 AA44062 Elmeasco instruments Pty Ltd G P O Box 1240 Adelaide South Australia 5001 Tel 8 271 1838 Eimeasco Instruments Pty Ltd P O Box 95 Gosnells West Australia 6110 Australia Tet 9 398 3362 Austrias c Walter Rekirsch Elektronische Gerate GmbH amp Co Vertrieb KG Obachgasse 28 1220 Vienna Austria Tel 222 235555 TLX 847 134759
126. lution lt 1 Freq range 50 kHz 20 MHz or greater Leveled Generator 3 digits 0 25 Resolution JF 8020A Flatness 50 kHz 1 MHz 0 1 kHz 10 MHz 0 5 kHz 20 MHz 0 7 Flat Attenuator 20 dB three required GR 874 G20L 1V Transfer Standard 50 kHz 20 MHz 0 1 JF AB5 1V GR Tee 874 GR 874 TL Adapter 874 BNC 2 required GR 874 QBPAL Adapter 874 BNC GR 874 OBJAL Adapter Banana BNC Pomona 1296 Adapter 8921 only BNC Banana Pomona 1259 Feed thru 500 Termination 1 GHz rated 011 0049 01 Table 4 2 Input Power Selection SWITCH POSITION SELECTED LINE SOURCE REAR PANEL ac 210 10 WATTS 120V 50 400 Hz 100V 50 400 Hz 220V 50 400 Hz 240V 50 400 Hz 250V MAX USZUA BU21A nme 2 4 11 Fuse Replacement 4 12 The 8920A and 8921A have one replaceable fuse located on the rear panel which may be replaced with a Buss 1 8 amp slo blo fuse 4 13 PERFORMANCE CHECK NOTE In the following procedures the instrument 89204 or 8921 which is being either checked or calibrated is referred to as the UUT Unit Under Test 4 14 The performance check provides a means of verifying the overall operation of the UUT This procedure can be used as an acceptance test for receiving inspection and as a periodic maintenance check Refer to Table 4 1 for t
127. mpedances are 50 75 93 110 124 135 150 300 600 900 1000 and 1200 ohms RELATIVE dB REFERENCE Avoltage present when this switch is depressed to its REL position is held as 0 dB reference for all other voltages dB RESOLUTION 00148 ACCURACY The accuracy specifications given below apply to the volts and dB display modes at 9 to 100 of full scale 23 5 C 90 days Table 1 AC of Voltage oe 88 INPUT _______________ C VOLTAGE 10Hz 20Hz 10Hz 20Hz _ 200kHz 1MHz 2MHz 10MHz 20MHz Hz 200kHz 1 COT 272222272 2MHz 10MHz 20MHz 700V 200V 1 0 5 0 7 0 15 dB 0 148 0 15 dB 5 0 5 dB 180 700V 18 0 199 9 1 80 19 99 180 1 999 18 0 199 9 mV 1 80 19 99 1 2 mV t 0 15dB 0 25 dB 0 4 dB 180 1 999 mV 0 k dB 0 i di 0 si dB 10Hz 20Hz 20 200kHz 1MHz 2MHz 10MHz 20MHz Hz 200 kHz 1 MHz 2 MHz 10 MHz 20 200 mV nae Temperature Coefficients 20 Hz 1 MHz 07 C 006 dB C 0 C 18 C 28 C 50 C 1MHz 20MHz 1 C 01dB C 1 3 8920 8921 Table 1 3 8920A 8921A Specifications cont Table 2 AC DC of Voltage Reading or 48 INPUT AC DC ACCURACY RANGE VOLTAGE 10Hz 20Hz 50Hz _ 200kHz 1MHz 2MHz X 10MHz 20 MHz 180 700V 18 0 199 9 1 80 19 99 180 1 999 2V 18 0 199 9 200 m
128. n California 05245 Components Corp now Corcom Inc Chicago illinois 05277 Westinghouse Electric Corp Semiconductor Div Youngwood Pennsylvania 05278 Replaced by 43543 05279 Southwest Machine amp Plastic Co Glendora California 05397 Union Carbide Corp Materials Systems Div New York New York 05571 Use 56289 Sprague Electric Div Los Angeles California 05574 Viking Industries Chatsworth Cahtorma 05704 Replaced by 16258 05820 Wakefield Engineering Inc Waketield Massachusetts 06001 General Electric Co Electronic Capacitor amp Battery Products Dept Columbia South Carolina 06136 Replaced by 63743 06383 Panduit Corp Tinley Park 06473 Bunker Ramo Corp Amphenol SAMS Div Chatsworth California 06555 Beede Electrical instrument Co Penacook New Hampshire 06739 Eiectron Corp Littleton Colorado 06743 Cievite Corp Cleveland 06751 Components Inc Semcor Div Phoenix Arizona 06860 Gould Automotive Div City of industry California 06961 Vernitran Corp Piezo Electric Div Formerly Clevite Corp Piezo Electric Div Bedford Ohio 06980 Eimac Div Varian Associates San Carlos California 07047 The Ross Milton Co South Hampton Pennsylvania 07115 Replaced 14674 07138 Westinghouse Electric Corp Electronic Tube Div Horsehead New York 07233 TRW Electronic Components Cinch Gra
129. n and OFF out Rotary switch used to manually select one of twelve reference impedances when the dBm and dB display modes are selected A push push switch used to select either the relative dB or the dBm display mode When REL is depressed the existing input level is used to establish 0 dB reference Subsequent level changes at the input are displayed in dB and referenced to the operator established 0 dB level When dBm is selected measurements are displayed in terms of dBm and the dBm REFERENCE setting A push push switch used to select either the voltage out or dB in display mode A momentary pushbutton switch used to incrementally step the voltmeter to its next higher range This switch is enabled only when the HOLD RANGE mode is selected A push push switch used to select the manual HOLD or autorange AUTO mode Selecting HOLD in enables manua upranging with the STEP UP witch Selecting AUTO out enables the unit to autorange A push push switch which when depressed adds the 2 mV range to the autorange loop When the switch is out the 2 mV range cannot be accessed A push push switch used to include in or delete out dc components as part of the input signal level 2 3 8920A 8921A Table 2 2 Controls indicators and Connectors cont FUNCTION F1 Line fuse MDL 1 8A slow blow DIGITAL OUTPUT LOG ANALOG OUTPUT output port reserved for use with the Logarithmic Output Option 004 892
130. n the Model 8920A 8921A is shown in Figure 4 5 4 42 When troubleshooting the UUT the following points should be kept in mind 1 Before any troubleshooting is begun make a visual inspection of the interior of the instrument 2 When troubleshooting the AC Amplifiers isolate the test lead with a 10 probe otherwise capacitive loading may cause the AC Amplifiers to oscillate 3 MOS type integrated circuits can be damaged by discharging static electricity through the device All circuits of this type are designated on the schematic with this symbol Usecareand always use a grounded soldering iron when removing or installing MOS devices 4 43 troubleshooting guide for the 8920A and 8921A is presented in Table 4 9 This guide is in a tabular flow chart form and is recommended for use in isolating a problem to a functional circuit area The initial steps in the troubleshooting guide refer to the Performance Checks made earlier in this section 4 44 RMS Sensor Replacement 4 45 Use the following procedure when replacing the rms sensor This procedure should be completed if the troubleshooting procedure indicates that the rms sensor must be replaced refer to Figure 4 5 1 Carefully unsolder the defective sensor from the AC PCB using a grounded soldering iron 2 lnstall the new sensor be sure that the sensor spacer pad is in place and replace the AC Assembly and shield 3
131. ncy root mean square read only memory second time oscilloscope shieid silicon serial number shift register tantaium terminal board temperature coefficient or temperature compensating temperature compensated crystal oscillator test point micro 1075 ultra high frequency microsecond s 10 5 unit under test voit voitage variabie voltage controlied oscillator very high frequency very low frequency watt s wire wound transformer transistor crystal crystal oscillator ohm s micro 19 5 p 20891 Self Organizing Systems inc Dallas Texas 21604 Bucheye Stamping Co Columbus 21845 Sotitron Devices inc Transistor Division Riveria Beach Florida 22767 ITT Semiconductors Alto 23059 Product Comp Corp Mount Vernon New York 23732 Tracor inc Rockville Maryland 23880 Stantord Applied Engrng Santa Ciara Cahfornia 23936 Pamotot Div Wm J Purdy Co Burlingame Caltarnia 24248 Replaced by 94222 24355 Analog Devices Inc Norwood Massachusetts 24655 Generai Radio Concord Massachusetts 24759 Lenox Fugte Electronics Inc South Piaintieid New Jersey 25088 Siemen Corp isden New Jersey 25403 Electronic Corp Semiconcuctor Micro Circuims Div 51 Rnode Island 27014 National Semiconductor Corp Santa Ciara Cantoria 27264 Products Downers Grove
132. nents Cinch Connector Operations Div Grove Village Chicago illinois 72005 Wilber B Driver Co Newark New Jersey 72092 Replaced 06980 72136 Electro Motive Mfg Co Williamantic Connecticut 72259 Nytronics inc Pelham Manor New Jersey 72619 Dialight Div Amperex Electronic Corp Brookiyn New York 72653 G C Electronics Div of Hydrornetals Inc Brookiyn New York 72665 Replaced by 90303 72794 Dzus Fastener Co inc West istip New York 72928 Guiton Ind inc Gudeman Div Chicago Iilinois 72982 Erie Tech Products Inc Erie Pennsyivania 73138 Bechman instrument inc Helipot Division Fullerton California 73293 Hughes Aircraft Co Electron Dynamics Div Torrance California 73445 Amperex Electronic Corp Hicksville New York 73559 Carling Electric Inc West Hartford Connecticut 73586 Circie F industries Trenton New Jersey 73734 Federal Screw Products Inc Chicago Illinois 73743 Fischer Specia Mtg Co Cincinnati Ohio 73899 JFD Electronics Co Components Corp Brookiyn New York 73949 Guardian Electric Mfg Co Chicago Illinois 74199 Quan Nichols Co Chicago 74217 Radio Switch Corp Mariboro New Jersey 74276 Signalite Div General instrument Corp Neptune New Jersey 74306 Piezo Crystal Co Carlisle Pennsylvania 74542 Hoyt Elect instr Works Penacook New Hampshire 74970 Johnson E F Co Waseca Minn
133. nnectors are shown in Figure 2 2 and described in Table 2 2 Features peculiar to one instrument are identified by model number i e 8920A or 8921A Figure 2 2 Controls Indicators and Connectors 8920A 8921A REF NO 11 12 14 Table 2 2 Controls Indicators and Connectors NAME INPUT Analog Panel Meter Digital Display Annunciators 2 MHz MAX RELATIVE REFERENCE POWER Switch dBmREFERENCE REL dBm dB VOLTS STEP UP HOLD AUTO LO RANGE ENABLE AC DC AC FUNCTION 8920A A BNC input connector The low side is isolated from power ground through a pair of parallel diodes 8921A Banana plugs provide high low and power ground input connections The HI and LO terminals are isolated from power ground Maximum common mode voltage is 500V rms ibo Uncalibrated panel meter provides analog tracking of input level useful for peaking and nulling indications LED display provides a direct readout of the input signal level includes decimal point and polarity LED s that light to indicate the selected measurement function V volts mV millivolts or dB decibels An LED that lights to indicate that the instrument has autoranged into the 2 mV range This range has a maximum frequency limit of 2 MHz An LED that lights to indicate that the voltmeter is in the dB display mode and using relative voltage reference A push push switch used to turn the instrument ON i
134. nters the 2 mV range the2 MHz annunciator will illuminate to remind the user of instrument limitations 3 29 COMPUTATIONS 3 30 The Controller is able to count compute in two modes linear or non linear The following paragraphs will explain how the Controller obtains its linear volts or non linear dB readings 3 31 VOLTAGE COMPUTATIONS 3 32 To make a voltage measurement the Controller must linearly count clock pulses for a time determined by the A D Converter Referring to Figure 3 7 you can see that when the dB VOLTS switch is placed in its up out position the rate multiplier RM will be shunted and the main counter will count the number of clock pulses exactly as they occur linear Assoon asthe integrator in the A D Converter reaches the auto zero point CM will go high commanding the main counter to stop counting and simultaneously shifting its count to the data latches What is now held in the data latches is a count of clock pulses in bcd format that is proportional to the true rms value of the signal being measured The bcd data is then shifted out of the controller to a seven segment decoder on four lines W X Y and Z 3 33 dB COMPUTATIONS 3 34 If the dB VOLTS switch is in the dB position a non linear count of the clock pulses is enabled The binary rate multiplier RM passes only a fraction of the clock pulses on to the Controller s main counter see the illustrated input to the main counter
135. ntroller 3 44 The annunciators excepting the 2 MHz MAX are strobed on by STO STO is routed through two circuits One path is completed when the dB VOLTS switch is inthe dB position The dB annunciator DS309 is enabled H the REL dBm control is in the REL position RELATIVE REFERENCE annunciator DS308 will also be enabled the dB VOLTS control is in the VOLTS position STO is routed through another path and either the V annunciator DS307 or the mV annunciator DS306 is enabled depending upon the present range of the instrument If the LO RANGE ENABLE control has the 2 mV range enabled and the instrument is in the 2 mV range the 2 MHz MAX annunciator will be illuminated to remind the user of the 2 MHz input range of the instrument 3 45 Power Supply 3 46 The power supply section on the Main PCB provides the instrument with operating voltages and logic levels of 15V 15V and 5V 3 47 Line voltage 100V 120V 220V or 240V as selected by controls S209 and S210 is connected to the primary of the main power transformer 7200 via POWER switch S208 and fuse Fl The secondary of 1200 contains two windings One winding drives the 5V power supply the other drives the 15V power supply 3 48 In the 5 power supply power from the secondary winding is full wave rectified by CR205 filtered by C211 and regulated by VR203 3 49 In the X15V power supply power from the secondary winding is full wave rectified by CR204 filte
136. ocked In the case of optional subassemblies plug ins etc that are 8920A 8921A not always part of the instrument or are deviations from the basic instrument model the REC QTY column lists the recommended quantity of the item in that particular assembly 5 4 HOW TO OBTAIN PARTS 5 5 Components may be ordered from the nearest Fluke authorized service center listed at the rear of this manual To ensure prompt and efficient handling of your order include the following information 1 Quantity 2 FLUKE stock number 3 Description 4 Reference designation or Item number 5 Printed circuit board part number and rev letter 5 Instrument model and serial number CAUTION The above symbol indicates devices subject to damage by static discharge ITEM FLUKE MFG NO DESCRIPTION STOCK SPLY NO CODE H1 H2 H3 H4 MP1 MP2 MP4 MP5 MP6 MP7 9 10 11 R1 R204 R3 Table 5 1 8920A 8921A Final Assembly MODEL 8920A 8921A FINAL ASSEMBLY MAIN PCB ASSEMBLY 89204 89204 8001 FIGURE 5 2 8921A 89214 5011 FIGURE 5 3 PCB ASSY 89204 8921A FIG 5 5 SCREW FHP 6 32 X 3 4 SCREW PHP 2 56 X 1 4 SCREW 4 40 X 1 4 PHP SCREW 6 32 X 5 8 FHP GUARD COVER C SIZE COVER PLATE DOU BAIL RETAINER HANDLE DECAL RETAINER COVER C SIZE HANDLE COVER AC SHIELD LINE CORD NOT SHOWN SOLDER LUG 11 16 LG 9 8921A ONLY SOLDER LUG 7 8 LG 141 8920A ONLY SEE
137. olds true 5052 POWER DIVIDER 500 5082 RF TEST SOURCE CIRCUIT 502 TERMINATION A 502 5009 RF 500 COAX TEST SOURCE CIRCUIT 502 TERMINATION B Figure 2 3 Matched Impedance Measurement Techniques 2 34 COMMON MODE VOLTAGE MEASUREMENTTS 2 35 The Model 8921A is equipped with isolated input connections and accomodate common mode floating voltages as high as 500V rms Higher common mode voltages may cause instrument failure The 8920A will accomodate common mode voltages as high as 600 mV peak usually enough to open ground loops in the power connections 2 36 Even though the 8921A is capable of making common mode measurements it is not a true balanced input voltmeter It does not have equal or balanced impedances between the high and ground and the low and ground input terminals On the 8921A the LO to ground input capacitance is not matched with the high to ground capacitance Since the majority of voltmeter applications do not require balanced inputs this will rarely present a problem 2 5 8920A 8921A 2 37 Input Signal Considerations 2 38 The 8920A 8921A is a true rms voltmeter and as such is subject to input conditions not encountered with the ordinary average reading ac voltmeter Of these the two most important are crest factor and input coupling 2 39 CREST FACTOR 2 40 Crest factor is the ratio of the peak voltage to the rms voltage of a waveform with the dc component
138. onditioner 3 16 The Signal Conditioner utilizes an Input Atenuator two amplifiers Amp A and B and the 3 2 8920A 8921A Intermediate Attenuator As shown in Figure 3 3 these circuits are used to scale the varying voltage levels applied to the instrument so that the input to the RMS Converter is always between 0 09 rms and rms The diagram in Figure 3 3 illustrates the configuration of the circuitry within the Signal Conditioner The Controller through a range decoder network issues commands which select the appropriate division factor in the attenuators and the correct multiplication factor for Amplifier A Table 3 1 lists each operating range and the corresponding division and multiplication factors for the attenuators and amplifier note that Amplifier B has a fixed gain of x11 The last column lists the components FETs and relays that conduct to establish gain configuration of the circuits see the schematics for details on components 3 17 RMS Converter 3 18 The 8920A and 89214 use a thermal rms converter circuit which supplies a dc output voltage proportional to the rms value of the ac input The thermal sensor is a pair of resistor transistor elements thermally isolated from each other and the case see Figure 3 4 The ac input signal Vac from Amp B produces a temperature change in the RMS Sensor s input resistor which is sensed by the associated transistor and causes a voltage change at the negative input
139. opolis Cairo Egypt Tet 2 695705 TLX 927 22782 England Fluke GB Ltd Colonial Way Watford Herts WD2 4TT England Tei 823 40511 TLX 851 934583 Fiji Awa Fiji 47 Forster Road Walu Bay Suva Fiji Tel 312079 TLX 792 FJ2347 Finiand n instrumentarium Elektroniiki oy Box 64 02631 63 Finiand Tet 0 5281 TLX 857 124426 France a M B Electronique S A 606 Rue Fourney Box 31 78530 France Tet 3 956 8131 TLX 842 695414 German Democratic Republic Amtest Associates Ltd Clarence House 31 Clarence St Staines Middiesex TW18 4SY United Kingdom Tet 784 63555 TLX 851 828855 Germany West Fluke Deutschland GmbH Oskar Messter Strasse 18 8045 ismaning Munich West Germany Tei 89 96050 TLX 841 0522472 Rapifax 49 89 9605166 Fluke Deutschland GmbH Viertriebsburo Dusseldorf Meineckestrasse 53 D 4000 Dusseldod 30 West Germany Tet 211 450831 YLX 841 17 2114233 Fluke Deutschland GmbH Vertriebsburo Hamburg Habichthorst 42 D 2000 Hamburg 61 West Germany Tet 40 5519031 TLX 841 02174556 Greece Hellenic Scientific Representations Ltd 11 Vrassida Street kthens 612 Greece Tet 1 711140 TEX 863 219330 Hong Kong Schmidt amp Co H K Ltd 18th Floor Great Eagle Centre 23 Harbour Road Wanchai Hong Kong Tel 5 8330 222 TLX 780 74766 or 780 76762
140. phic City of Industry California 07256 Silicon Transistor Corp Div of BBF Group Inc Cheimsford Massachusetts 07261 Aumet Corp Culver City Calitornia 97263 Fairchild Semiconductor Div of Fairchild Camera amp Instrument Corp Mountain View California 07344 Bircher Co inc Rochester New York 07597 Burndy Corp Tape Cabie Div Rochester New York 07792 Lerma Engineering Corp Northampton Massachusetts 07910 Teiedyne Semiconductor Formerly Continental Device Hawthorne California 07933 Use 49956 Raytheon Co Semiconductor Div HQ Mountain View California 08225 Industro Transistor Corp Long island City New York 08261 Spectra Strip Corp Garden Grove California 08530 Reliance Corp Brookiyn New York 08806 General Electric Co Miniature Lamp Products Dept Cleveland Ohio 08863 Corp Norrisvitle Pennsylvania 08988 Use 53085 Skottie Electronics inc Archbaid Pennsylvania 09214 Co Semi Conductor Products Dept Power Semi Conductor Products OPN Sec Auburn New York 09353 C and K Components Watertown Massachusetts 09423 Scientific Components Inc Santa Barbara California 09922 Burndy Corp Norwalk Connecticut 09969 Dale Electronics inc Yankton S Dakota 10059 Barker Engineering Corp Formerly Amerace ESNA Corp Kenilworth New Jersey 11236 CTS ot Berne Berne indiana
141. put a 0 dB point to which all other voltage inputs may be referenced For measurements at a single test point merely press the dB switch then the REL switch and watch the dB change as you make adjustments and change components 2 63 typical application for the dB measurement mode is shown in Figure 2 4 The relative reference 0 dB has been established at TP2 Subsequenct dB measurements at TP3 4 and TPS are displayed in dB as shown Figure 2 4 Typical Relative dB Measurements 8920A 8921A 2 64 RELATIVE REFERENCE SELECTION 2 65 Usethe following procedure to enable the relative REL display mode and select a relative 0 dB reference 1 Connect the reference source to the 8920 8921 input terminals If desired measure and adjust the reference supply voltage level 2 Select the autorange mode AUTO 3 Release the REL dBm switch out 4 Depress the dB VOLTS switch in 5 With the reference level still connedted to the input terminals depress the REL switch The display should now read 0dB and the RELATIVE REFERENCE annunciator should be lit 2 66 OTHER dBm REFERENCES 2 67 When a dBm reference other than those given on the dBm REFERENCE switch is required use the following procedure to establish the reference l Define the reference impedance R and calculate V using the following formula 0 001 x R 2 Apply a reference voltage such that the 8920 8921 displ
142. quent readings Note that if the instrument is ranged up down 20 dB will be added to or subtracted from the reading held in the reference latches The reading held in the reference latches however will be lost any time the instrument is turned off or if the REL switch is released 3 42 Display and Annunciators 3 43 The computed value of the input to the instrument is transmitted serially as four bit BCD characters on the W X Y and Z data lines from the Controller to the Seven Segment Decoder see Figure 3 8 Display and Annunciators The output of the Seven Segment Decoder drives the Displav Data Bus which is commen to the inputs of all five of the Display LEDs Strobe pulses from the Controller determine which Display LED is enabled to accept the data on the Display Data Bus ST4 through ST7 strobes the seven segment LEDs from LSD to MSD respectively STO gates the 1 digit If the volts display mode is selected 3 and 1 2 digits will be enabled resulting in a resolution of 0 0565 If the dB display mode is selected 4 and 1 2 digits will be REF RANGE CONTROL CONTROL dB LIN RD D E STO ST 7 FRONT PANEL COMMANDS RANGE REF REL dBM 2mV ENABLE ANNUNCIATORS V mV dB 2mHZ REL S3NUI Viva dog DECODER Figure 3 8 Display and Annunciators 3 10 8920A 8921A B enabled and the resolution will be 0 01 dB The decimal point 18 enabled separately by the DP line from the Co
143. r base voltage is compared to the reference Vbe of the second half and scaled up accordingly This voltage in turn develops a current which is summed with range information to produce the logarithmic output 604 10 The output of the sensor covers one decade to IV in one range Scaling is such that one decade corresponds to 2V or 20dB 1V f dB at the output 0 dB corresponds to 200 uV and each range increase produces an additional 2V at the output Transients during range changes are eliminated bv a sample and hold circuit 604 11 MAINTENANCE 604 12 The following maintenance information covers three areas performance testing calibration and troubleshooting of the 004 Logarithmic Analog Output Option However before any of these procedures can be started the calibration of the mainframe instrument 5920 must be successfully completed The table of recommended test equipment in Section 4 lists ali of the 604 1 8920A 8921A H1 SAME AS 003 REMOVE DOU OPTION COVER PLATE USE SAME SCREWS TO INSTALL MP1 i i 1 Em Figure 604 1 Logarithmic Analog Output Option Installation 604 2 8920A 8921A b WEM 004 C501 C502 C503 C504 C505 C506 CR501 J501 1502 1 501 9501 9502 R501 R505 R506 8507 1508 R509 R510 R511 R512 R513 R514 R515 8516 R518 R519 R520 R524 R525 TP501 TP502 TP503 TP504 0501 9502 502 Table 604
144. range less than 180 digits You may eliminate this underrange indication by manually selecting a lower range or selecting autorange 2 4 8920 8921 _ pair of banana jacks for Output accessing the dc linear analog output _ voltage 8920A only This voltage is proportional to the Vrms input and is linearly scaled 2V dc out equals a 2000 count readout The scale repeats for each range A 3 prong line power connector for connecting the unit to line power 2 20 The uncalibrated analog panel meter complements the digital display by linearily tracking the input signal level provides 0 to 100 ot scale indication for the selected range This feature will aid vou in detecting the peak and null points of inputs having varying levels 2 21 Measurement Connections 2 2 COAX OR OPEN LEADS 2 23 We recommend shielded or coax leads be used at the input for low level or high frequency measurements Open leads unshielded may pick up interference from other sources causing errors at low levels You may reduce high frequency errors by minimizing inductance and capacitance between the source and the 8920A 8921A input connector Open test leads are otherwise adequate 2 24 SAFETY CONSIDERATIONS 2 25 Under normal operating conditions the 8920A 8921A will not present a potential electrical shock hazard i0 the operator However careless use of input lead connectors and adaptors may create a shock hazard WA
145. red by C209 and C210 and regulated into 15V by VR202 The 15V is regulated by 1211 and Q207 9 11 3 12 8920 8921 a Section 4 Maintenance WARNING THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO 4 1 INTRODUCTION 4 2 This section of the manual contains information on service general maintenance performance tests calibration and troubleshooting The performance test is recommended s a preventive maintenance tool and should be executed when it is necessary to verify proper instrument operation A calibration interval of 90 days 15 recommended to insure that the 8920A and 8921A perform within the specifications stated in Section 1 4 3 Table 4 lists the recommended test equipment necessary to maintain both instruments If the specified equipment is not available other equipment having equivalent specifications may be used 4 4 GENERAL MAINTENANCE 4 5 Access Information 4 6 gain access to the interior of the instrument remove the four 86 32 phillips screws located on the bottom of the case This loosens the top and bottom allowing the top cover to be removed 4 7 INPUT POWER SELECTION 4 8 The 8920A and 8921A may be operated from any one of the line voltages shown in Table 4 2 Use the follow
146. removed The 8920A 8921A will accomodate signals having crest factors of 7 at full scale increasing for down scale readings Use the following formula to calculate below full scale crest factors capability 7 x Range input 2 41 INPUT COUPLING AC DC Crest Factor 2 42 The 8920A 8921A are equipped with a FUNCTION switch which allows vou to select either AC or AC DC coupling When the switch is AC coupling is selected In this function the dc component is removed from the input signal and is not measured or displayed Depressing the FUNCTION switch selects AC DC coupling This function allows the 8920A 8921A to measure and display the true rms value for the total input signal ac components and dc components You should always consider the dc component when power dissipation is being determined 2 43 Range Selection 2 44 Seven voltage ranges and what appears to be a single dB range spanning 132 dB are provided in each instrument Range selection is normally accomplished automatically Override switches step up however allow vou to interrupt the autorange function and manually increment the range 2 45 We designed the autorange function to optimize the display reading for a given input Each reading is displayed complete with decimal point and units annunciator Since range selection is essentially automatic the individual ranges are not directly defined for the operator Instead underrange flashing decimal point
147. ronik Ajetier Toi 4415461 TLX 821 24399 Uruguay Montevideo Coasin Uruguaya SA Tel 789015 TLX 398 UY23010 Venezuela Caracas Tel 239 0967 FLX 895 21027 Wesi Germany lemaning Munich Fluke Deutschland GmbH Tet 96050 TLC 841 0522472 eR ER aet RE MT Fl L E John F BOXER Eve luke Mfg ine Everett WA 98206 Fluke Holland B V Box 226938230 CG Eindhoven The Netherlands Phone 040 458045 TLX 51848
148. s presented in the following paragraphs 3 5 Analog Circuitry 3 6 Theanalog section comprises the largest portion of the 8920A and 8921A circuitry As shown in Figure 3 1 this section is broken down into the following areas the Signal Conditioner the RMS Converter and the Power Supply 3 7 Referring to Figure 3 2 you can see that the signal being measured by either the 8920A or 8921A can be coupled to the Signal Conditioner in one of two ways AC DC When you place the FUNCTION switch on the front panel to the AC position all input LINEAR ANALOG OUTPUT 8920A only POWER SUPPLY A D CONVERTER Figure 3 1 Overall Block Diagram 3 1 8920A 8921A signals are capacitively coupled when the AC DC position is selected the input signal is dc or directly coupled This feature contributes to the measurement accuracy when dc components are present in the input signal 3 8 The Signal Conditioner insures that the varying levels on instrument s input voltages are properly scaled before being applied to the RMS Converter The RMS Converter works on a thermal sensing principle Basically it operates by balancing the heating power ofa dc feedback signal to the heating power of the ac input signal When the two are equal the circuit is in equilibrium and the dc output voltage applied tothe A D Converter is directly representative of the true rms value of the ac input signal The dc output of the RMS Converter is
149. shipping container 2 6 INSTALLATION 2 7 8920 and 892 were designed for bench top use or for installation in a standard 19 inch equipment rack or panel mounted into any DIN size opening Available rack mounting kits are listed in Table 2 1 n bench top environments the 8920A 8921A may be stacked with other Fluke products that use the PTI case To connect two or more cases pull the side connectors out place one casesquarely on top of another Section 2 Operating Instructions and press in on the side connectors of the top case until they seat firmly into the slots on the case below See Figure 2 1 CAUTION Before you attempt to lift a series of stacked instruments check each unit to ensure that its case connectors are properly mated and latched to the next lower instrument Table 2 1 Rack Mounting Kits MODEL NO DESCRIPTION Rack Mounting Kit single unit Rack Mounting Kit double unit Panel Adapter DIN size CONNECTORS Figure 2 1 PTI Connection 2 1 8920A 8921A 2 8 INPUT POWER 2 9 The 8920A and 8921A can be operated from any one of your line voltages 100 120 220 or 240V There is a procedure in Section 4 which describes how to alter the line power configuration of the instrument We do however recommend that this procedure be performed by qualified personnel only 2 10 CONTROLS AND INDICATORS 2 11 The 8920A 8921A controls indicators and co
150. t steps 8 and 9 until the Counter Timer display limit can be met at the lowest possible input level 603 17 Troubleshooting 603 18 Table 603 4 should be completed Y i the performance test and calibration procedure indicate the the 003 Counter Output Option IS NOT operating correctly This table includes voltage levels and waveforms of a properly functioning 003 Option If you are unable to obtain any value 215 then you should replace the defective component and repeat the entire troubleshooting procedure However if all values are obtained then the performance test and calibration procedure must be repeated 603 19 LIST OF REPLACEABLE PARTS 603 20 list of replaceable parts for the Counter Output Option is given in Table 603 5 and shown in Figure 603 6 Refer to Section 5 of this manual for ordering information Table 603 4 Counter Output Option Troubleshooting 1 waveforms MEASURE BETWEEN HIGH TERMINAL LOW TERMINAL 7402 1 and Input Common T402 3 and Input T402 6 and Input Common 1402 8 and Input Common 603 6 8920 8921 Using the 8020A or any compatible 3 1 2 digit meter measure the following supply voltages SUPPLY VOLTAGE MEASURE BETWEEN HIGH DVM DISPLAY TERMINAL AND LOW 8020A TERMINAL 15 U401 1 and Input 15 00 0 1V 15 0401 6 and Input Common 15 00 0 2V 5 1402 2 and Input Common 5 00 0 25V 5 3 0401 1 and
151. ted 1 Remove the tape dot on RI and turn RII to its Max CCW position 2 Select AC AUTORANGE then HOLD to lock the UUT inthe 20 mV range Referto Figure 4 5 for the calibration and test point locations Monitor the voltage at TP4 with a DVM and apply 20 6 mV 200 Hz to the input 3 Turn slowly clockwise until the DVM reading stops decreasing Note the DVM reading and turn Ril back slightly CCW Increase the input to 25 6 mV and CAREFULLY adjust RII clockwise for a reading on the DVM 07V 002 smaller than the noted reading DO NOT ADJUST FURTHER OR THE SENSOR MAY FAIL Now increase the input to 256 mV 2 kHz The voltage at TP4 should not change by more than 20 mV 4 Replace the tape dot on or use Glyptol 8920A 8921A 4 40 TROUBLESHOOTING 4 41 This section contains information selected to assist in troubleshooting the Model 8920 8921 Before attempting to troubleshoot the instrument however it should be verified that the trouble is actually in the instrument and is not caused by faulty external equipment or improper control settings For this reason the Performance Check is suggested as a first step in troubleshooting The Performance Check may also help to localize the trouble to a particular section of the instrument If the Performance Check fails to localize the trouble the following information may be helpful Location of principal circuitry areas test points and adjustment locations i
152. troller blanks the display and checks if the input to the instrument is now in range or ifa further change in range is necessary When the proper range is found display blanking is removed and the cycle time returns to normal Use of the HOLD RANGE control will command the Controller to remain at the present range see Table 3 5 Input Range Codes via command input line D E and F Use of the STEP UP RANGE control will increment the instrument one range 3 5 8920 8921 INTEGRATOR 1 0V DC FULL SCALE RMS gt CONVERTER a INTEGRATE lt AUTO ZERO PERIOD READ dB PERIOD VOLTAGE C203 UNDER RANGE INT 100 mSEC lt CLOCK 11 111 111 iliii 2 DE MEN TTT CM l 0 180 COUNTS 1999 Figure 3 5 A D Converter Simplified Schematic and Timing 3 6 8920A 8921A E 100 ms ZI EXTENDED INTEGRATE OVERLOAD OL AUTO ZERO 2 OL ONLY REFERENCE 100 ms AUTO ZERO OR Figure 3 6 Controller Timing A D Converter Table 3 2 Controller Summary INPUT OUTPUT Input 1 Vss 5V supply input Compare signal from A D Converter Input External Oscillator input Input 400 kHz crystal input for internal oscillator Output i RG Negative going pulse in the middle of each strobe Insures strobed data for D
153. unctions TEES NA 3 8 Display and Annunciators LEES 3 10 Low and Midband Performance Test Set Up A AR dab Se Ba Ke 4 3 DC Low Level Check Test Set Up accesses 4 6 Low Level Check Test Set Up 4 7 High Frequency Response Check Test Set Up 4 7 Calibration and Test Point Location ua 4 8 Linear Analog Output Test Set Up 8920A only vide dara 4 12 High Frequency Calibration Test Set Up 4 14 A D Waveforms General Condition sv Ca VP CREER EA a 4 18 Counter Output Option Installation phased 603 2 Counter Output Option Simplified Schematic 603 3 Counter Output Performance Set Up a 603 4 Counter Output Performance Test Set Up use Are 603 4 Calibratiori TS ES REY 603 5 Counter Output Option PCB Assembly ere ere ee 603 10 Logarithmic Analog Output Option Installation 604 2 Logarithmic Analog Output Option Simplified Schematic 604 3 Logarithmic Analog Output Option Test Set Up 604 4 Logarithmic Analog Output Option PCB Assembly
154. usetts 86684 Radio Corp of America Electronic Components Div Harrison New Jersey 86928 Seastrom Mfg Co Inc Glendale California 87034 Ittuminated Products inc Subsidiary of Oak Industries Inc Anahiem California 88219 Gould Inc industrial Div Trenton New Jersey 88245 Litton Systems Inc Useco Div Van Nuys California BB419 Cornell Dubilier Electronic Div Federal Pacific Co Fuquay Varian North Carolina 88486 Plastic Wire amp Cable Jewitt City Connecticut 88690 Replaced 04217 89536 John Fluke Mfg Co inc Seattle Washington 89730 G E Co Newark Lamp Works Newark New Jersey i mr 00213 Nytronics Comp Group Inc Subsidiary of Nytronics inc Formerly Sage Electronics Rochester New York 00327 Wetwyn International Inc Westlake Ohio 00656 Aerovox Corp New Bedford Massachusetts 00686 Capacitors inc Passaic New Jersey 00779 AMP inc Harrisburg Pennsyivania 01121 Allen Bradley Co Milwaukee Wisconsin 01281 TRW Electronic Comp Semiconductor Operations Lawndaie California 01295 Texas instruments inc Semiconductor Group Dallas Texas 01537 Motorola Communications amp Electronics Inc Franklin Park Hiinois 01686 RCL Eiectronics inc Mancnester New Hampshire 01730 Replaced by 73586 01884 Use 56289 Spraque Electric Co Dearborn Electronic Div Lockwood Fiorida 02114 Ferroxcube
155. xico 5 660 4323 TLX 383 1771038 Morocco s Oussama S A Angie Bouievard Emile Zola et Rue Rethel PO Box 2007 Casa Casablanca Morocco Tei 24 13 38 TLX 22730 M Associated Enterprises 790 Pyapnai Tole Kathmandu Nepal Tei 13868 Netherlands Fiuke Holand PO Bo 2269 5600 CG Eindhoven Nethertands Tei 40 458045 TLX 844 51846 Fluke Nederland BY Gasthuisnng 14 PO Box 115 5000 AC Tibutg The Netherlands 13 352455 TLX 1844 52683 New Zeaiand Northrop Instruments amp Systems Ltd Information Technology Group 459 Khyber Pass Road Private Bag Newmarket Auckiand t New Zealand Tet 9 501 801 TLX 791 21570 Northrop insttuments amp Systems Ltd information Technology Group first Floor Northrop Biog 189 19 t Wihs Street PO Box 240 Welington New Zealand 4 856 656 FLX 7911 3380 Northrop instruments amp Systems 110 intormation Technoiogy Group 110 Mandeville Street Box 8385 Christchurch New Zealand Tel 3 488 874 TLX 791 4801 Norway Morgenstierne amp Co A S Konghellegate 3 P O Box 6688 Rodelokka Oslo 5 Norway Tet 2 356110 TLX 856 71719 Oman OHi Teiecommunications P O Box 889 Muscat Sultanate ot Oman Tel 603606 TLX 926 5052 Pakistan International Operations PAX Ltd 505 Muhammadi House Chundrigar Road P O Box 5323 Karachi Pakistan Tet 21
156. yara 2 4 2 16 Display Indications bua dada esa ovx p Cen 2 4 2 21 Measurement exer ea coeds Tu PAR TA Ri 2 4 2 37 Input Signal Considerations 2 6 2 43 Range S lection y a suspi RIS 7 2 50 Voltage Display Mode p 2 6 2 53 dB Display MOUSE Ss Puy Peta DE d RU et 2 6 2 56 dBm Measurements s 2 7 2 68 Linear Analog Output aaa RAI 2 8 3 2 70 OPERATION a Veh eus DI 2 8 i 3 THEORY OF OPERATION ets di ie Le Uude eod aee gie sa 8 1 3 1 INTRODUCTION ai vai eta ean Pee ER Va x each 3 1 3 3 OVERALL FUNCTIONAL DESCRIPTION 3 1 3 5 Analog CITCUI UV oe Ge OR IHR OS dp alam DANT 3 1 3 10 Digital 4 iran ya siap ew we ee IRE 3 2 3 13 DETAILED BLOCK DIAGRAM DESCRIPTION 3 2 3 15 Signal Conditioner cca wa gk d s doe CEP IG ES VA 3 2 3 17 RMS EATER EN eer tan 3 2 3 20 A D Converter Sega ni AAN OSE eo Reena Y Ea SOHO 3 2 3 24 Controller ae COE XR CL u dca ek 3 5 3 42 Display and Annunciators 55 3 10 3 45 Power SHOP

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