1964 - HP Archive
Contents
1. IS THAT WHAT WE SAID The Apmi May edition of Bench Briefs carried an article concermng the black coated tubes used in some instru ments It may have been implied that the tubes are no longer used in any instrument This is not the case The coated tubes are still used in some instruments but as reported are no longer neededinthe f Models 14004 130C 120A 122A Also we indicated the proper replacement for the ccated tubes once used for V2 V3 inthe Model 410B High Fre quency VTVM was stock number 5080 0425 While this tube will work in the 410B stock number 5080 0681 is the preferred tube type thetypewe recommend for the best performance from your 410B2. wire connects from XA4 to 82 from pin 1 of XA4 to pin 3 The capacitor used is stock no 0150 0093 ceramic 01 uf 80 20 100V dew the resistor is stock no 0683 2015 composition 200 ohm 5 1 4 watt lllustrated also 1s a schematic diagram for this modi fication Remember to change your Operating and Service Manual to show the new configuration O CABLE tO 2 2080 IS v cu T ol The above information 18 available as a Service Note If you want a copy for your file circle 5275A 1 under SERVICE NOTE ANNEX MODEL 690 SERIES SWEEP OSCILLATORS Serials Below 410 00186 You can improve power meter leveling in your 690 series Sweep Oscillators Simply change R43 on the ALC board to a metal film 3K chm 45 4 1 2 watt resistor stock no 0758 0035 no adjustments are necessary amp MODEL 726AR POWER SUPPLY Seriais Below 410 00401 An improved transistor type s available for replace ment of Q21 in the above instruments The replace ment type stock no 1850 0081 type 2N1362 has a higher BV collector to emitter breakdown volt age rating than the original stock no 1850 0015 type 2N375 Replacement is recommended only if Q21 fails NEWS FROM HARRISON LABORATORIES DIVISION OF We ve some better replacement transistor types to recommend for four H Labs Power Supplies as listed below The use of these transistors over those originally installed will resultin in
3. 4C 1 For your amp Model 684C serials 100 00181 and below and amp Model 687C serials 110 00113 and below Electronic Sweep Oscillators described in this Service Note are wiring changes for improved leveling and power output at the low frequency endof the band 1782A 1 This Service Note describes a modification for your amp Model 1782A Display Scanner serials be low 413 00476 The results of the simple modificahor are improvements in the external scan rate and range of the external horizontal level adjustment 415D 1 For your amp Model 415D SWR Meter with gertals below 406 01001 here Is a Service Note de scribing how you may modify your instrument for variable meter damping 5243L 1 This Service Note concerns your ig Models 5243L serlals prefixed 328 and below and 5245L serials prefixed 335 and below Electronic Counters Described in this Note is a kit you may install which allows the Model 5264A Preset or the Model 5265A Digital Voltmeter to operate in the 5243L anc 5245L eee ee ee ete tee eee Cut Along Dotted Line 7 7 7 SERVICE NOTE ANNEX amp family instruments Here s a list of the latest Service Notes to help insure a maximum usage rom your To obtain a copy simply circle the Service Note number you wish Cut along dotted Une enclose this portion of Bench Briefs in an envelope and send it to your nearest field office or to us at Customer Service In Western Europ
4. HP Archive This vintage Hewlett Packard document was preserved and distributed by www hparchive com Please visit us on the web On line curator Glenn Robb This document is for FREE distribution only June July 1964 PROFESSOR WATTS SCHOOL FOR SERVICE TIPS AND MISTS amp MODEL 1415A TIME DOMAIN REFLECTOMETER Here is a change for you to note in your copy of the 14154 Operating and Service Manual Before you make the vertical calibration check described in figure 3 3 attach a 50 ohm load or short length of 50 ohm cable to the 1415A SIGNAL OUT Also first connect this 50 ohm load or cable before making the STEP CALI BRATE ADJUSTMENT as outlined in paragraph 5 28 amp MODELS 160B 3170A OSCILLOSCOPES Serials Below 237 00786 For improved power supply regulationathigh ambient temperatures in the scopes listed above make the following easy modification Add a 0 1 uf 50 volt ceramic capacitor C413 from the base to the emitter of Q408 no adjustments are necessary as a result of the circuit change The 9 stock number for this capacitor 15 0150 0084 i MODEL 1781A or 1781B OSCILLOSCOPE SWEEP DELAY GENERATORS Here is a change to the adjustment procedure in your 17814 or B Operating and Service Manual When making PRESET adjustments your manual instructs Adjust PRESET R60 to give a reading 1 5 volts more positive than maximun negative reading In stead change 1 5 volts to read 2 5 volts If
5. ard 1 4 tnch outside diameter soldering tip Vary the measurements to suit your needs ee 5 Pa wen 4 eee Pa Y E I4 G TINNED ra ye A m COPPER WIRE Nau a I fe ABOUT ZIN LONG OOS A A att a i j A Ce a y DRILL 1 6 IN HOLE lt THE BEST CIRCUIT BOARD PULLER WE VE TRIED This is one of those tools that after using you wonder how you got along without E H Titchener amp Ca of Binghamton N Y has developed the mate to the plug in circuit board WIRE GRIP an ideal circuit board puller A particularly excellent per former where circuit boards are nested closely vinyl covered shock resistant WIRE GRIP carefully but firmly grips only 1 8 inch of the circuit board well away from delicate components The pullers are available in two sizes one witha 1 1 2 inch jaw 6 95 each the other llustrated with a 2 7 8 inch jaw 5 95 for quantitles 1 250 For further information contact E H Titchener amp Co 1 Titchener Place Binghamtou N Y 13902 A BETTER ADDRESS FOR SOLDAPULLT The February March edition of Bench Briefs carried an article concerning a solder remover Soldapullt Many of you have written us Saying you were unable to contact the manufacturer with the address we supplied no zip code number If you wish to try again we have been assured that the zip code number will do the trick Here s the full address be sure to include t
6. creased reliability Power Supplies with semals above those listed already use the recommended types There s no need to change to a recommended type unless there is a transistor failure Reference Designator Recommended Replacement Type 2N2152 2N2152A 2N2156 or 2N2156A Instrument 6224A S N below 401 Q12 6226A Q12 S N below 503 2N2154 2N2134A 2N2158 or 2N2158A 6266A S N below 182 Q13 amp 14 B1203 2N1137A 2N459A or 2N1547 6368A S N below 131 Ql0 amp 11 Bi203 2N11374 2N4594 or 2N1547 Of the recommended types these are preferred RECORDER NEWS FROM F L MOSELEY AFFILIATE You may want to modify your Moseley Recorder read on Traditionally recording paper has been held in position on the flat platen of an X Y recorder by vacuum or other mechanical means this system means you must have motors fans pumps or clips also the relatively high maintenance that any mechan ical system requires Now you can if you have one of the Moseley Recorders listed below modify your instrument and rid yourself of all these mechanical parts With the modification kit installed all sizes of paper equal to or smaller than the platen are held down by electro static attraction The holddown system 15 quiet and virtually maintenance free wari HPARCHIVE com Moseley s trademark for the electric holddown sys tem 1s AUTOGRIP Kit
7. d in your 187Aor B will pay dividends in the formof increased reliability improved resolution and greater ease of operation of the VERTICAL POSITION controls involved primarily in the modification is the installation of a new ten turn potentiometer MISSING INSTRUMENTS Jerrold Electronics Corporation of Norwalk California reports the following instruments stolen approximately the first part of June amp Model X752D Waveguide Directional Coupler amp serial number 9827 and Jerrold serial number 11240 Model P292B Waveguide to Waveguide Adapter Jerrold sertal number 11234 f you have any information concerning these missing in struments please contact Jerrold Electronics Corp 12340 E Firestone Blvd Norwalk Callfornia Phone Area Code 213 868 4784 bench briefs HEWLETT PACKARD COMPANY 395 Page Mill Road e Palo Alto California 94306 Return Requested warar HPARCHIVE com IT S SERVICE NOTE INDEX TIME AGAIN The semi yearly Service Note Index is avatlable to you for the asking This index is a summary of 169 lt Service Notes most all of X Sg which have been at some Le time advertised in Bench N EP ESAN Briefs Also available isa Pan handy order blank for those i al Op of you who wish to order bse NS Service Notes you may have missed If you wish acopy of the Service Note Index includes order blank circle Service Note Index under SERVICE NOTE ANNEX
8. e send order to Hewlett Packard S A 54 Route des Acaclas Geneva Switzerland Do you have a friend who would enjoy receiving Bench Briefs If so pleage give us big name and address Please Print Name Address 140A 1 160B 6 405AR 10 684C 1782A 1 M 96 1300 41 SEE TEXT wwe HPARCHIVE com 1B7A 4A 310A 2 415D 1 47BA 1 5243L 1 52754 1 Service Note Index SEE TEXT 140A 1 Here isaService Note describing a modification for your Model 140A Oscilloscope serials prefixed 326 The modification makes it possible for you to Interchange high frequency plug ins such ag the Model 1402A Dual Trace amplifler n your 140A and still maintain the same frequency response 160B 6 The intensity limit adjustment in your amp Model 160B Oscilloscope regardless of serial number may be insulated to prevent electrical shock This Service Note describes the procedure 130 Ths Service Note describes amp modification kit 00130 89501 for your Model 130C Oscilloscope With this kit installed In your 130C the Instrument is equiva lent to the 130C with option 06 That is the vertical horizontal and syne inputs are available atthe rear of the instrument as well as the front panel 1874 4A This Service Note applies to your amp Mode 187A Dual Trace Amplifier regardless of serial number and your Model 187B Dual Trace Amplifier with serials below 325 01469 The modification described inthis Ser vice Note installe
9. he zip code Edsyn Company P O Box 868 Arleta California 91332 Telephone Area Code No 213 36 9 4889 SERVICE NOTES SERVICE NOTES Were loaded withService Noteinformationthis issue Fact is we ve so many Service Notes toofier you they won t fit in the usual space SERVICE NOTE ANNEX Instead we ll describe each as weusually do in the following text you may then under SERVICE NOTE ANNEX circle the appropriate Service Note number of those you wish to receive M 36 For increased reliability breakdown diode amp stock no 1902 0043 has been replaced by other stock numbers the replacement depending upon the y instrument you may have The change affects the amp Models 103AR 104AR 2154 721A This Service Note describes the affected circuit reference in each instrument and recommends the proper replacement diode 310A 2 Improve the short circuit protection of your 3 Model 310A Wave Analyzer with the modification described in this Service Note If your 310A has a serial number of 415 00561 or above the change has already been incorporated 405AR 10 Described in this Service Note is the stock no 0950 0091 neon and photoconductive switch assembly and ts installatlon This partis a direct re placement for the photoconductive switch assembly presently in your Model 405AR BR CR Digital Voltmeters with serials below 402 02801 The new switch assembly will provide increased reliability 68
10. s are now available for the following instruments 2D 2DR 2D 2 2DR 2 2D 2A 2DR 24 2D 2M 2DR 2M 2D 24M 2DR 2AM 2D 3 2DR 3 2D 3M 2DR 3M 2FR 2FRA 135 195A 135M 135AM 136 and 136A Kit price is 125 To insure that you receive the proper kit we lineedto know the model and serial number of your recorder and if a Q3 ar Q4 roll chart accessory is being used For ordering the kit Or for additional information contact your nearest sales office aris No 5 R i S s o NEW SERVICE TOOLS a oe ee More new service tools available one for you do it yourselfers another offered by the manufacturer Wi 4 A whe Sle by 4 S i BIG IRON LITTLE TIP Did you know you can make a versatile low temperature soldering iron out of your full size iron Maybe you ve already thought of this one look at the llustration below Tf you obtain an extra plug in tip for your tron drill it down the center then cut it part way down with a hack saw plug in a length of 10 12 or 14 size wire you have your low temperature iron Think of the versatility With this configuration you have the perfect heat for most etched circuit work you can vary the tip heat by selection of wire size and or lengthening the tip Tips are cheap and expendable lengthen or bend them to suit your needs The illustration below shows a suggested plan for a typical 60 watt iron before modification with a Stand
11. you adjust PRESET using this higher voltage it will Insure better stability by eliminating any chance that the 1781A or 1781B will double trigger warn HPARCHIVE com bench briefs YOUR PRIVATE LINE TO HEWLETT PACKARD S CUSTOMER SERVICE DEPT Vol 5 No 2 amp MODEL 478A THERMISTOR MOUNTS More Good News on the 478A In the February March edition of Bench Briefs we announced that you could now balance your 478A serials above 7662 or any mount returned to the factory for repair after March 15 if it had been un balanced from an accidental overload But alas gone 18 the thermistor which has been blasted to de Struction it must be replaced If the latter is your predicament yov be happy to know you can now replace the thermistor assembly yourself Replacement thermistor assemblies are available in kit form under amp stock number 00478 600 The kit Includes thermistor and etched circuit assemblies which have been pretested for VSWR and efficiency Service Note 478A 1 gives further information If you wish a copy circle 478A 1 under SERVICE NOTE ANNEX ip MODEL 5275A TIME INTERVAL COUNTER Serials 402 00315 and Below Have you observed a mysterious 1 or 2 count in the 1 usec readout column of your 5275A after manual reset It may happen in units with serials below 402 00318 if It does here s the easy cure Simply add a capacitor and resistor to connectors XAl XA4 as illustrated below Also move the white
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