HP 413A User's Manual
Contents
1. Twentieth Century Plastics Inc Los Angeles Calif Westinghouse Electric Corp Semi Conductor Dept Mumitronic Engineering Co Sunnyvale Calif Barber Colman Co Rockford Metropolitan Telecommuni Metro Cap Stewart Engineering Santa Cruz Calif The Bassick Bridgeport Beede Electrical Instrument Co In Penacook Torrington Mfg Co West Div Van Nuys Calif Corning Glass Works Electronic Components Dept Burbank Calif Palo Alto Calif Youngwood adena Digitran Co 00015 19 Revised 6 December 1961 CODE NO 07137 07138 07261 07263 07910 07933 07980 08145 08358 08717 08718 08792 09026 09134 09250 09569 10411 10646 11236 11237 11312 11711 11717 11870 12697 14655 15909 16758 18873 19315 17500 19701 20183 21520 21335 21964 24446 24455 24655 26462 26992 28480 33173 35434 37942 39543 40920 42190 43990 44655 47904 MANUFACTURER Transistor Electronics Corp Minneapolis Minn Westinghouse Electric Corp iWon Tube Die NX Avnet Corp Los Angeles Calif Fairchild Semiconductor Corp Mountain View Calif Continental Device Corp Hawthorne Calif Rheem Semiconductor Corp Mountain View Calif Boonton N J Los Angeles Calif ADDRESS Boonton Radio Corp U S Engineering Co Burgess2. C103 C104 0170 0029 C fxd poly 0 01 uf 10 50 vdew C105 Not assigned C106 0140 0010 C fxd mica 820 pf 10 500 vdew C107 0180 0033 fxd elect 50 uf 6 C108 109 0150 0012 fxd cer 0 01 uf 20 1000 vdcw C110 0180 0033 fxd elect 50 uf 6 C111 0160 0015 fxd paper 0 47 uf 10 200 vdew C112 0150 0024 fxd 0 02 uf 8075 20 600 C113 6 2 0150 0012 fxd cer 0 01 uf 20 1000 See introduction to this section 01138 2 Model 413A Section VI Table 6 1 Table 6 1 Reference Designation Index Cont d Circuit 0170 0003 fxd my 0 051 uf 10 200 vdew C114 C115 116 0160 0015 fxd paper 0 47 uf 10 200 vdew C117 0180 0105 fxd elect 50 uf 25 vdcw 0170 0022 C118 fxd my 0 1 uf 20 600 Diode breakdown CRI G 31G 7H 51 2140 0012 Lamp minat 2 pin no 12 DS2 thru DS100 Not assigned DS101 thru DS104 2140 0012 Lamp minat 2 pin no 12 F1 2110 0020 Fuse cartridge 0 8 amp s b for 115V operation 2110 0018 Fuse cartridge 0 25 amp s b for 230V operation J1 thru J100 Not assigned J101 AC 10C Binding post black AC 10D Binding post red AC 54A Insulator binding post AC 54E Insulator binding post black 2 hole AC 10C Bindin
3. N Y Gavitt Wire and Cable Co Div of Amerace Corp Burroughs Electronic Tube Div Model Eng and Inc Brookfield Mass Plainfield N J Huntington Ind Festus Mo Now York Loyd Scruggs Arco Electronics Inc A J Glesener Co Inc San Francisco Calif Good All Electric Mfg Ogallala Neb Sarkes Tarzian Inc Bloomington Ind Boonton Molding Company Boonton N J R M Bracamonte amp San Francisco Calif New Haven Conn Chicago III Koiled Kords Ine Seamless Rubber Co Radio Corp of Americ Electron Tube Di Philco Corp Land Harrison NJ Division Lansdale Pa Western Fibrous Glass Products Co San Francisco Calif Lincoln Ill Cutlar Hammer Inc General Electric Distributing Corp Schenectady N Y Garter Parts Div of Economy Baler Co Chicago IIl United Transformer Chicago IIl U S Rubber Co Mechanical Goods Div Possale N J Bearing Engineering Co San Francisco Calif Connor Spring Mfg Co San Francisco Calif Radio Materials Co Chicago Ill Augat Brothers Inc Attleboro Mass Dale Electronics Inc Columbus Nebr Elco Corp Gromar Mfg Inc Development C Minneapolis Honeywell Regulator Co Micro Switch Division Freeport III Universal Metal Products Bassett Puente Calif Sylvania Electric Prod Inc Semiconductor Div Robbins and Myers I
4. OPERATING AND SERVICE MANUAL CERTIFICATION THE HEWLETT PACKARD COMPANY CERTIFIES THAT THIS INSTRUMENT WAS THOROUGHLY TESTED AND INSPECTED AND FOUND TO MEET ITS PUBLISHED SPECIFICATIONS WHEN IT WAS SHIPPED FROM THE FACTORY dg FURTHER CERTIFIES THAT ITS CALIBRATION MEASUREMENTS ARE TRACEABLE TO THE NATIONAL BUREAU OF STANDARDS TO THE EXTENT ALLOWED BY THE BUREAU S CALI BRATION FACILITY 01138 2 OPERATING AND SERVICE MANUAL MODEL 413A AR SERIALS PREFIXED 139 DC NULL VOLTMETER HEWLETT PACKARD COMPANY Copyright 1961 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A dp Printed FEB 1962 Table of Contents Model 413A Lists of Illustrations and Tables TABLE OF CONTENTS Section Page Section Page I GENERAL INFORMATION 1 1 Cont d 5 1 I i IntroducHem lt lt lt SUR d 5 7 Troubleshooting e 5 1 1 4 Description j w J 9 sp xo 308551 5 8 General IEAS 5 1 1 8 Three Conductor Power Cable 1 1 5 10 Amplifier Power Supply 5 2 1 10 Calibration Accuracy 1 1 5 12 Chopper Assembly 9 2 5 14 Modulator lt s s s 5 2 5 16 Demodulator 212 5 3 H PORT act 5 18 Repair and Replacement 5 4 1 Incoming Inspection 2 1 2 4 Reshipment ac 5 19 General 5 5 4 tallado eS 2 1 5 21 Modulator Replacement 5 4 2
5. 0139 0730 0149 0730 0150 0733 0014 0813 0018 1200 0009 1200 0048 1200 0059 1400 0084 1450 0022 1450 0043 1930 0016 1932 0030 1933 0007 1940 0004 1940 0007 2100 0009 fxd fxd fxd fxd fxd fxd fxd fxd fxd fxd fxd fxd fxd fxd fxd fxd IIA TS AA a fxd Socket Socket Socket dep dep c dep c dep c dep c dep dep c dep c dep c ww 2 tube tube tube Fuseholder Lampholder Lampholder Tube electron Tube Tube Tube Tube R var comp electron electron electron electron Description 100K ohms 1 1 2W 108K ohms 1 1 2W 123K ohms 1 2 1 2W 284K ohms 1 2 1 2W 333K ohms 1 1 2W 389 5K ohms 1 2 1 2 W 900K ohms 1 2 1 2W 1M 1 1 2W 1 13M 1 1 2 W 1 66M 1 1 2 2 845 1 1W 6 155 1 1W 8 1M 1 2 1W 9 M 1 2 1W 28 1 M 1 205 1W 50M 1 29 1W TOM 1 2W 8K ohms 10 5W 7 pin minat 9 pin 9 pin minat rmo cmo 6x4 12AX7 6AU8 OA2 OB2 25K ohms 20 1 3W 01138 2 Mfr Part No DC 1 2 CR5 DC 1 2 AR5 obd 1 DC 1 2 AR5 22 8 DC 1 2 AR5 DC 1 2 5 obd DC 1 2 AR5 obd 1 1 DC 1 2 AR5 obd TE DC 1
6. 1 1 to 1 13 SECTION 1 GENERAL INFORMATION 1 1 INTRODUCTION 1 2 SCOPE This manual supplies operation and maintenance information for the Model 413A DC Null Voltmeter A performance check that may be used for verifying specifications during incoming inspection is given in paragraph 5 40 1 3 INSTRUMENT IDENTIFICATION Hewlett Packard Company uses a two section eight digit serial number e g 000 00000 If the first three digits of the serial number on your instrument do not agree with those on the title page of this manual yellow change sheets have been supplied with the manual which define differences between your instrument and the model described in this manual If these change sheets are missing your Hewlett Packard sales representative can supply you with this information 1 4 DESCRIPTION 1 5 GENERAL The Model 413A DC Null Voltmeter is a zero center dc voltmeter with end scale ranges from 1 to 1000 volts in a 1 3 10 sequence Input impedance varies from 10 megohms to 200 megohms depending on the setting of the RANGE VOLTS switch The input terminals are isolated from the cabinet and ground permitting operation from references up to 500 volts de or 130 volts ac from ground potential 1 6 INDICATORS In addition to the conventional meter which has both a normal 10 of full scale and expanded full scale range of zero adjustment the Model 413A has amplifier output connectors which provide an output
7. 2 845M 1 2 1W 0730 0139 fxd dep 9M 1 2 1W 0727 0192 fxd dep c 46 3K ohms 1 2 1 2W 0727 0231 fxd dep 284K ohms 1 2 1 2W 0727 0239 fxd dep c 389 5K ohms 1 2 1 2W 0727 0215 fxd dep 123K ohms 1 2 1 2W 0727 0188 fxd dep c 38 95K ohms 1 2 1 2W 0727 0164 fxd dep c 12 3K ohms 1 2 1 2W 0727 0130 fxd dep c 3895 ohms 1 2 1 2W 0727 0106 fxd dep c 1230 ohms 1 2 1 2W R R R R R R R R R R R R R R R R R 0727 0070 fxd dep c 389 ohms 1 2 1 2W 95 0727 0051 R fxd dep c 180 ohms 1 2 1 2W R96 thru R100 Not assigned R101 0687 4741 R fxd comp 470K ohms 10 1 2W R102 0687 1041 R fxd comp 100K ohms 10 1 2W See introduction to this section 6 4 01138 2 Model 413A Section VI Table 6 1 Table 6 2 Reference Designation Index Cont d Circuit Stock No Do 0687 1821 comp 1 8K ohms 10 1 2W 0727 0043 dep c 100 ohms 1 1 2W 0687 4751 comp 4 7M 10 1 2W 0687 1051 comp 1M 10 1 2W 0687 1031 comp 10K ohms 10 1 2W 0687 2261 comp 22M 10 1 2W 0687 1051 comp 1M 10 1 2W 0687 4731 comp 47K ohms 10 1 2W 0687 2751 comp 2 7M 10 1 2W 0687 1021 comp 1K ohms 10 1 2W 0687 1041 comp 100K ohms 10 1 2W 0687 8241 comp 820K ohms 10 1 2W 0687 3331 comp 33K ohms 10 1 2W 2100 0009 comp 25K ohms 20 1 3W 0687 2751 comp 2 7M 10 1 2W 0687 103
8. 5 7 and 5 8 adjust the ZERO control for zero on the meter At the same time set 51 to posi tion 2 and voltmeter calibrator function switch to DC g Adjust Rl for the same reading observed in steps e f zero error point This accurately establishes one volt at the center arm of R1 h Each cardinal numbered point on the accuracy indicator scale is now 1 giving a range of 3 for the accuracy indicator 5 38 GAIN CALIBRATION 5 39 The following procedure uses the standardized test setup from paragraph 5 37 Proceed as follows a Connect the accuracy indicator and the voltmeter calibrator tothe 413A under testas shownin figure 5 8 Note The rest of this procedure assumes that a DC Null Voltmeter such as the Model 413A is being used as the accuracy indicator dp 4138 DC NULL VOLTMETER dj VOLTMETER CALIBRATOR Figure 5 9 Performance Test Voltmeter Setup 01138 2 Section Paragraphs 5 38 tp 5 42 b Set 51 in figure 5 8 to position 1 Set the voltmeter calibrator function switch to OFF and the range switches toprovide a 1 volt output d Set 413A RANGE VOLTS switch to 1 e Adjust 413A ZERO control to read zero on the accuracy indicator f Set Sl in figure 5 8 to position 2 and set volt meter calibrator function switch to DC g Adjust R119 Gain Cal on the 413A under test for a reading of zero on the accuracy indicator h Adjust R123 Meter Cal for
9. Battery Co Falls Ontario Canada Sloan Company Burbank Calif Cannon Electric Co Phoenix Phoenix Ariz CBS Electronics Semiconductor Operations Div of 5 Inc Lowell Costa Mesa Calif Houston Texas Chicago IIl Babcock Relays Inc Texas Capacitor Co Electro Assemblies Inc Mallory Ba of Canada Toronto Ontario Canada Ti Tal Ine Berkeley Calif Carborundum Co Niagara Falls CIS of Berne Inc Berne Ind Chicago Telephone of California Inc d MA So Pasadena Calif Microwave Electronics Corp Palo Alto Calif Instrument Corporation conductor Division Imperial Electronics Inc Melabs Inc Newark N Buona Park Cali Palo Alto Calif Clarostat Mig Co Dover N H Cornell Dubilier Elec Corp So Plainfield N J The Daven Co Livingston N J Delco Radio Div of G M amo Ind In E DuPont and Co Inc Wilmington Del Eclipse Pioneer Div of Bendix Aviation Corp Thomas A Edison Industries Div of Co West Orange N J Electra Manufacturing Co Kansas City Mo Electronic Tube Corp Philadelphi Fansteel Metallurgical Corp Teterboro N J N III The Fafnir Bearing Co Britain Conn Fed Telephone and Radio Corp Clifton NJ Schenectady N Y General Electric Co G E Lamp Division Nela Park Cleveland Ohio General Radio
10. CHANGE 1 Table 6 1 Replaceable Parts Change T1 to Stock No 9100 0238 Figure 5 16 Power Supply Change schematic diagram as shown TO PIN TO PIN 6 TO 05101 VIO3 VIO3 ETC ETC TO SI TO CIB amp PI ERRATA Table 1 1 SPECIFICATIONS Noise Specification should read Noise Less than 2 mv RMS on any range 3 31 64 R Supplement A for 413A 900 Manual Changes Model 4134 Page 2 Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes ERRATA Figure 2 1 230 Volt Operation Change 51 to S2 Figure 4 1 Model 413A Block Diagram Add arrowhead to arc on A103 to indicate clockwise rotation of the light interrupter Paragraph 5 12 Chopper Assembly Step Delete last sentence Figure 5 1 103 Chopper Assembly x Change DS104 413AR to DS101 413AR Change DS103 413AR to DS102 413AR Change DS101 413AR to DS104 413AR Change DS102 413AR to DS103 413AR Paragraph 5 16 Demodulator Step d should read Connect a 1 uf capacitor across the input terminals of an ohmmeter Paragraph 5 33 Hum Balance Step d First sentence should read Adjust Hum Bal R3 for minimum less than 5 millivolts peak to peak 10 cps signal as seen on oscilloscope Paragraph 5 35 Amplifier Gain Calibration and Meter Calibration Add the following sentence to Step f Set voltmeter calibrator range switch to 1 0 volt Figure 5 8 Amplifier Calibration Test Setup Add System
11. Co West Concord Mass Grobet File Co of Americ lnc Carlstadt NJ Lancaster Pa lo Alto Calif Hamilton Watch Co Hewlett Packard G E Receiving Tube Dept Owensboro Ky Lectrohm Inc Chicago P R Mallory amp Co Inc Indianapolis Ind Mechanical Industries Prod Co Akron Ohio Miniature Precision Bearings Inc Keeno Muter Co Chicago C A Norgren Co Englewood Colo Ohmite Mfg Co Skokie Polaroid Corp Cambridge Mass CODE NO 48620 49956 54294 55026 55933 55938 56137 56289 59446 81778 62119 64959 65092 66346 70276 70309 70485 70563 70903 70998 71002 71041 71218 71286 71313 71400 71450 71468 71471 71482 71528 71590 71700 71744 71753 71785 71984 72136 72354 72619 72656 72758 72765 72825 72928 72982 73061 73138 73293 73445 73506 73559 73682 73743 73793 73905 74455 MANUFACTURER ADDRESS Precision Thermometer and Inst Co Philadelphia P Raytheon Company Lexington Mass Shallcross Mfg Co Selma N C Simpson Electric Co Chicago Sonotone Corp Sorenson amp Co Inc So Norwalk Conn Spaulding Fibre Co Inc Tonawanda Sprague Electric Co North Adams Mass Telex Inc St Paul Minn Union Switch and Signal Div of Elmsford N Y Westinghouse Air Co Swissvale Pa Universal Electric Co Owosso Mich Western Electric
12. RANGE volts SWITCH G 74AT Knob red 3 4 in bar w arrow NORMAL EXPAND SWITCH 412A 37A Light rod modulator cmo 412A 37B Light rod modulator rmo 412A 65A Assy amplifier 412A 65A 1 Circuit board amplifier includes C108 thru C110 C112 C113 R106 thru R109 R111 thru R114 V101 V102 APPENDIX CODE LIST OF MANUFACTURERS Sheet 1 of 2 The following code numbers are from the Federal Supply Code for Manufacturers Cataloging Handbooks H4 1 to Code and H4 2 Code to Name and their latest supplements The date of revision and the date of the supplements used appear at the bottom of each page Alphabetical codes have been arbitrarily assigned to suppliers not appearing in the H4 handbooks CODE 00334 00335 00373 00656 00779 00781 00853 00846 00891 01121 01255 01281 01295 01349 01561 01589 01930 01961 02114 02286 02660 02735 02771 02777 03508 03705 03797 03877 03988 03954 04009 04062 04222 04298 El 04404 04651 04713 04732 04773 04870 05005 05277 05593 05624 05729 05783 02004 06555 06812 07115 07126 01138 1 MANUFACTURER Humidial Co Westrex Corp New York N Y Garlock Packing Co Electronic Products Div Camden N J Aerovox Corp New Bedford Mass Amp Inc Harrisburg Pa Aircraft Radio Corp Boonton N J Sangamo Electric Company Ordill Division Capacitors Marion Ill Goe Engineering Co Los Ange
13. Set NORMAL EXPANDED switch to the position desired Turn the RANGE VOLTS switch to the required level d Adjust the ZERO control to the desired setting Zero offset if any remains constant regardless of the range setting Connect the voltage to be measured to the input connectors 3 9 OPERATION WITH A RECORDER To obtain permanent records of 413A readings connect a re corder to the de amplifier output connector and operate the 413A as directed in paragraph 3 7 The output of the 413A amplifier is 1 end scale if necessary externally attenuate the 413A output to match it with recorder sensitivity Maximum rated load current from the 413A is 1 A load resistance of less than 1000 ohms may cause the load current to exceed 1 ma and thus cause errors in meter indication and amplifier gain 3 1 Model 413A Section IV Figure 4 1 CHOPPER ASSEMBLY AIO3 SIOIAB 05102 RANGE VOLTS 05101 FILTER FILTER FOLLOWER VIO2B 1 1 I I p wes METER OUTPUT I I I lt NEGATIVE FEEDBACK Bias ADJUST 9 CAL BD L 264 Figure 4 1 Model 413A Block Diagram 4 0 01138 1 Model 413A Section IV Paragraphs 4 1 to 4 8 SECTION IV PRINCIPLES OF OPERATION 4 1 GENERAL 4 2 The 413A is a de voltmeter which accomplishes amplification of the dc input voltage without the usual pr
14. adjustment The ZERO adjustment may be used to adjust the electrical zero of the instrument to the desired value Meter calibration is correct only when the meter needle is set to zero amplifier output voltage is always proportional to meter reading 01138 1 d NORMAL EXPANDED switch NORMAL EXPANDED switch provides two ranges of zero adjust ment NORMAL position is used when the meter needle has to be set critically within 10 of end scale from zero EXPANDED is used when it is desired to set a reference near the scale ends Meter sensitivity is unaffected by the setting of this control e Amplifier Output terminals The amplifier out put terminals figure 2 1 located on the rear of the 413A cabinet mount and on both the front and rear of the 413AR rack mounted instrument provide an output voltage proportional to meter deflection End scale meter deflection produces 1 volt output with the same polarity as the input signal 3 7 OPERATING INSTRUCTIONS 3 8 The following is a step by step procedure for operating the 413A When operating the 413A be sure that the ambient temperature is within the limits specified in paragraph 2 10 Proceed as follows CAUTION Do not overload this instrument The ampli fier input is not protected from extreme overload Momentary overloads ten times full scale will not damage the instrument Turn the power switch ON and allow 5 minutes for the instrument to stabilize b
15. comp 2 7M 10 1 2W EB2751 0687 3331 comp 33K ohms 10 1 2W EB3331 0687 4731 comp 47K ohms 10 1 2W EB4731 0687 4741 comp 470K ohms 10 1 2W EB4741 0687 4751 comp 4 7 m 10 1 2W EB4751 0687 8241 comp 820K ohms 10 1 2W EB8241 0690 1211 comp 120 ohms 10 1W GB1211 0690 5611 comp 560 ohms 10 1W GB5611 0727 0043 dep 100 ohms 1 1 2W DC 1 2 BR5 obdi 0727 0051 dep c 180 ohms 1 2W DC 1 2 ARS 0727 0070 dep 389 ohms 1 2 1 2W DC 1 2 AR5 0727 0100 dep 1K ohms 1 1 2W DC 1 2 CR5 0727 0106 dep c 1 23K ohms 1 2 1 2W DC 1 2 AR5 0727 0124 dep c 3K ohms 1 1 2 W DC 1 2 CR5 0727 0130 dep c 3895 ohms 1 2 1 2W DC 1 2 AR5 0727 0142 dep 6 2K ohms 1 1 2W DC 1 2 AR5 0727 0164 dep 12 3K ohms 1 2 1 2W DC 1 2 AR5 0727 0167 dep 13 7K ohms 1 1 2W DC 1 2 CR5 0727 0188 dep c 38 950 ohms 1 1 2W DC 1 2 ARS R R R R R R R R R R R R R R R 0727 0192 dep 46 3K ohms 1 2 1 2W DC 1 2 See introduction to this section 6 8 01138 2 Model 413A Table 6 2 Replaceable Parts Section VI Table 6 2 Cont d dp Stock No 0727 0208 0727 0209 0727 0215 0727 0231 0727 0233 0727 0239 0727 0262 0727 0274 0727 0278 0727 0283 0730 0117 0730 0128 0730 0134 0730
16. e and slide 101 away from the light rods Remove the four screws holding the input circuit assembly A101 to the main chassis When replacing this assembly be sure to reseat the insulated washers figure 5 3 in their proper positions f Disconnect the green lead at A101 g Carefully unsolder the shielded cable figure 5 3 from the amplifier circuit board pin 2 and 3 of V101A A length of cable is normally supplied with the input circuit assembly However if it is more convenient and the cable is known to be good it may be disconnected at the input assembly circuit board In any case avoid undue heat that might damage the inner conductor insulating material in the coax h Reverse the above procedure to install the re placement assembly 5 4 Model 413A 5 23 DEMODULATOR REPLACEMENT 5 24 To replace demodulator assembly A104 pro ceed as follows a Turn the 413A off b Remove the three leads connected to the demod ulator c Remove the two nuts from the demodulator mounting screws and remove the demodulator from the instrument If it is necessary to get at the screw heads to remove the nuts remove the four mounting screws from the chopper assembly and lettheassem bly hang by its leads d Reverse the above procedure to install replace ment assembly Wire connection differs for the 413A cabinet mount and the 413AR rack mount See figure 5 4 for wiring detail RACK MOUNT BOTTOM D
17. resistance indicated on the ohmmeter Typical resistance is between 1 and 2 megohms p Turn the 413A off and replace 05102 and V102 5 3 Section Paragraphs 5 18 to 5 28 5 18 REPAIR AND REPLACEMENT 5 19 GENERAL 5 20 This paragraph is intended to simplify repair problems in the 413A Tube replacement information is given as well as repair procedures for the mod ulator demodulator and RANGE VOLTS switch Repair procedures should be followed carefully to assure correct operation of replacement parts Re placing components on etched circuit boards requires extra care see figure 5 11 After component re placement in the following paragraphs refer to para graph 5 29 adjustments CAUTION Do not lubricate the RANGE VOLTS switch or touch the switch wafers with the fingers in the following procedures Wear a pair of light cotton gloves when handling the switch since skin oils and acids can contaminate the switch wafers and degrade instrument performance 5 21 MODULATOR REPLACEMENT 5 22 Figure 5 3 shows necessary disassembly for modulator replacement Proceed as follows a Unplug the 413A from the power source b Remove the cabinet paragraph 5 5 Disconnect all wires from the top of 101 as shown in figure 5 3 d Remove chopper assembly A103 and slide the light rods out of 101 Note In the 413AR rack mount unit it is not nec essary to remove the chopper assembly Perform step
18. voltage proportional to meter de flection This feature makes it possible to use the Model 413A as dc amplifier for use with thermo couples etc or to use it in conjunction with a re corder to obtain permanent records without the need for constant monitoring 01138 1 1 7 USES The Model 413A may be used for any application that calls for a dc null voltmeter High input impedance of the instrument makes it especially valuable for resistance bridge measurements The high voltage gain and the exceedingly low drift and noise make the Model 413A an ideal instrument for many control applications particularly where the sys tem must be left unattended for long periods of time 1 8 THREE CONDUCTOR POWER CABLE 1 9 For the protection of operating personnel the National Electrical Manufacturers Association NEMA recommends that the instrument panel and cabinet be grounded All Hewlett Packard instruments are equipped with a three conductor power cable which when plugged into an appropriate receptacle grounds the instrument The offset pin on the power cable three prong connector is the ground pin Topreserve the protection feature when operating the instrument from a two contact outlet use a three prong to two prong adapter and connect the green pigtail on the adapter to ground 1 10 CALIBRATION ACCURACY 1 11 The Hewlett Packard Company certifies that this instrument was thoroughly tested and inspected and found to m
19. 0 0009 XV105 Socket tube 7 pin minat MISCELLANEOUS G 74G Knob black 1in ZERO CONTROL G 74N Knob bar w arrow RANGE volts SWITCH G 74AT Knob red 3 4 in bar w arrow NORMAL EXPAND SWITCH 412A 37A Light rod modulator cmo 412A 37B Light rod modulator rmo 412A 65A Assy amplifier 412A 65A 1 Circuit board amplifier includes C108 thru C110 R111 thru R114 C112 V101 C113 V102 R106 thru R109 See introduction to this section 6 6 01138 2 Model 413A AC 10C AC 10D AC 54A AC 54B AC 54E AC 54F G 31G 7H 412A 23B 412A 58A 412A 95A 413A 19A 413A 19B 413A 81A 425A 97A 0140 0010 0150 0012 0150 0024 0150 0119 0160 0015 0170 0003 0170 0019 0170 0022 0170 0029 0170 0030 01138 2 Table 6 2 Binding post black cmo rmo Binding post red cmo rmo Insulator Binding post black 2 hole Insulator Binding post black 3 hole cmo rmo Insulator Binding post black 2 hole Insulator Binding post black 3 hole cmo rmo Diode breakdown Assy demodulator Assy input circuit includes A102 C101 thru C104 C106 C107 R101 thru R105 R119 R120 Assy modulator Assy switch range includes C99 R76 thru R95 R121 R127 S101 Assy switch zero includes R6 thru R9 R125 R126 5102 Meter calibrated Assy chopper include
20. 1 comp 10K ohms 10 1 2W 2100 0136 comp lin 6K ohms 20 3 10W 0727 0209 dep c 108K ohms 1 1 2W 0727 0142 dep c 6 2K ohms 10 1 2W 0727 0100 dep c 1K ohms 1 1 2W 2100 0022 ww lin 500 ohms 20 1W 0687 1821 comp 1 8K ohms 10 1 2 W 0727 0208 dep c 100K ohms 1 1 2W 0727 0278 1 13M 1 1 2W i IO AUN NC EC NE E UI Sp Q ce s 0727 0283 c 1 66M 1 1 2W 51 3101 0001 Switch tog SPST 52 3101 0033 Switch sl DPDT 53 thru 5100 Not assigned 5101 nsr part of range switch assy 105 8102 3100 0290 Switch rot 1 sect 2 pos w R8 var resistor See introduction to this section 01138 2 6 5 Section VI Model 413A Table 6 1 Circuit Reference V1 thru V100 Table 6 1 Reference Designation Index Cont d d Stock No Description 9100 0021 Transformer power Not assigned V101 1932 0030 Tube electron V102 1933 0007 Tube electron 6AU8 V103 1930 0016 Tube electron V104 1940 0004 Tube electron 0A2 V105 1940 0007 Tube electron 0B2 XDS1 1450 0022 Lampholder rmo 1450 0043 Lampholder cmo 1400 0084 Fuseholder XF1 thru 100 Not assigned XV101 1200 0048 Socket tube 9 pin XV102 1200 0059 Socket tube 9 pin minat XV103 thru 120
21. 101 Range Volts Switch Detail gt lt 5 5 252 Rack 2 0 5 6 Hum Balance Test Setup s gt o 5 6 5 7 Preliminary Test Setup 5 6 5 8 Amplifier Calibration Test Setup 9 7 4 1 Model 413A Block Diagram 4 0 5 9 Performance Test Voltmeter 4 2 Modulator Demodulator Operation Setup 5 7 Gioia 255 5 4 1 5 10 Performance Test Amplifier 4 3 Modulator Demodulator Operation A S ais 5 8 Phase DWO e e a ooa o6 ow 4 1 5 11 Servicing Etched Circuit Boards A 5 9 5 12 Model 413A Right Side View 5 10 5 1 101 Chopper Assembly 5 2 5 13 Model 413A Left Side View 5 11 5 2 Approximate Chopper Waveform 5 2 5 14 Model 413A Bottom View 5 12 5 3 Exploded View Showing Disassembly 5 15 Model 413A DC Null Voltmeter 5 13 for Modulator Replacement 5 3 9 16 Power 2 s s aa y oie 5 14 LIST OF TABLES Number Title Page 5 1 Equipment Required s so 5 1 559 Tube Replacement a ox oos 5 6 6 1 Reference Designation Index 6 1 6 2 Replaceable Parts MOREE ii 01138 2 Model 413A VOLTMETER Ranges Accuracy Limits of Zero Control Input Resistance AC Rejection AMPLIFIER Gain Gain Accuracy Linearity Noise Output Output Impedance AC Rejection GENERAL Input Terminals I
22. 2 AR5 obd DC 1 2 5 obd 1 1 DC 1 2 AR5 obd TT obd DC 1 65 DC 1 R5 obd obd DC 1 R5 obd DC 1 R5 PT1000 obd PT1000 obd PT2000 obd C 5 2800 316PH 3702 3908 2 4 121 51 11 082 342014 2020 AE 6x4 12AX7 6AU8 OA2 OB2 Type 45 obd See introduction to this section 6 9 Section VI Model 413A Table 6 2 Table 6 2 Replaceable Parts Cont d ou fee R var ww lin 500 ohms 20 1W Type 112 obd See introduction to this section 6 10 01138 2 g Stock No 2100 0022 10 3837 2100 0078 R var ww lin 500 ohms 30 3 10W 2100 0136 var comp lin 6K ohms 20 3 10W 70 MDL 1 4 2110 0018 Fuse cartridge 0 25 amp s b for 230 volt operation 2110 0020 Fuse cartridge 0 8 amp s b 313 800 for 115 volt operation No 12 2140 0012 Lamp minat 2 pin No 12 3100 0290 Switch rot 1 sect 2 pos w R8 var resistor 218429 K1P 3101 0001 Switch tog SPST 80994 H 3101 0033 Switch sl DPDT 4633 Synchron Model 3140 0013 Motor 6 3 VAC 610 6 3V 8120 0050 Cord power w NEMA plug CS 0041 PH 151 7 5 ft 9100 0021 Transformer power 4076 MISCELLANEOUS G 74G Knob black 1 ZERO CONTROL G 74N Knob bar w arrow
23. 5 6 Hum Balance Test Setup 5 34 BIAS ADJUST Set RANGE VOLTS switch full clockwise one step beyond 1000 b Adjust Bias Adj R116 to set meter pointer to zero 20 of end scale R116 is located on instru ment rear This adjustment is not critical since any deviation from zero is reduced more than 300 times when the RANGE VOLTS switch is on any operating position 5 35 AMPLIFIER GAIN CALIBRATION AND METER CALIBRATION 5 36 PRELIMINARY 5 37 The following procedure sets up a standard of 1 volt for voltage comparison for use in the following procedures Connect a voltage calibration generator to a 313A or 4124 test voltmeter and battery circuit as shown in figure5 7 This test voltmeter will hereafter be called the accuracy indicator b Set S1 in figure 5 7 to position 1 Set voltmeter calibrator function switch to OFF d Set accuracy indicator range switch to 08 dj DC NULL VOLTMETER ACCURACY INDICATOR VOLTMETER CALIBRATOR MERCURY CELL Figure 5 7 Preliminary Test Setup 01138 2 S Model 413A dj DC NULL VOLTMETER UNDER TEST DC NULL VOLTMETER dj 738aR VOLTMETER CALIBRATOR Figure 5 8 Amplifier Calibration Test Setup e If the accuracy indicator has no zero control observe the meter reading This reading will be used as the zero error point f If the accuracy indicator has a zero control as in figures
24. 8 230 Volt Operation ee ee 251 5 23 Demodulator Replacement 5 4 2 10 Environmental Limits 2527 2 1 5 25 Range Volts Switch d MENT Replacement 5 4 HI OPERATING INSTRUCTIONS 3 1 5 77 ub 3 10 Introduction 3 1 5 29 Adjustments 5 6 eas e 5 31 Mechanical Zero Adjustment 5 6 3 5 Controls Te 8 1 Saas Yap MNA 5 6 3 7 Operating Instructions 3 1 5 6 5 35 Amplifier Gain Calibration IV PRINCIPLES OF OPERATION 4 1 A Meer Has ANTO ESSA 4 1 General Siok 5 36 5 6 z te 4 3 DC Input Circuits 5 38 Cain Calibration 5 7 4 5 Circ lB S AES i 3 MUR ANA 6 5 40 Performance Verification 5 7 DOO saa 5 42 Voltmeter epe cvs vae 452 5 48 AC election lea 558 5 44 Amplifier Output s e sese 5 8 MAINTENANCE vue wis 851 ED roo los to 4 2 al VI REPLACEABLE PARTS 6 1 5 3 Test Instruments Required 5 1 6 1 Introduction 6 1 5 5 Cabinet Removal gt gt e s e s Sl 6 5 Ordering Information i Moe 6 1 LIST OF ILLUSTRATIONS Number Title Page Number Title Page 1 1 Model 413A DC Null Voltmeter 1 0 5 4 Cabinet Rack Demodulator Differences 7 we e Us eus 5 4 2 1 230 Volt Operation 2 0 5 5 5
25. EMODULATOR DETAIL CABINET MOUNT Figure 5 4 Cabinet Rack Demodulator Differences 5 25 RANGE VOLTS SWITCH REPLACEMENT 5 26 Figure 5 5 shows the location of all parts and wire destinations for the replacement of the RANGE VOLTS switch The Model 413A should be checked for correct calibration after replacing this switch CAUTION Make solder connections as quickly as pos sible when replacing components on the RANGE VOLTS switch AVOID 5 SIVE HEAT Excessive heat will damage the switch wafers Observe handling pre cautions described in paragraph 5 20 5 27 TUBE REPLACEMENT 5 28 If tubes are suspected of being defective check them by substitution and replace only those which are defective Table 5 2 gives any adjustments necessary after tube replacement 01138 2 Model 413A Section V Figure 5 5 Rel PNK TO RI25 RI26 PNK WHT TO RI25 GND Figure 5 5 S101 Range Volts Switch Detail 01138 1 5 5 Section Paragraphs 5 29 to 5 37 Table 5 2 Tube Replacement Hum Balance Bias Adjust None 5 29 ADJUSTMENTS 5 30 The following is a complete adjustment pro cedure and should be made only ifithas been definitely determined that the 413A is out of adjustment After adjustment refer to paragraph 5 40 to check instru ment operation 5 31 MECHANICAL ZERO ADJUSTMENT 5 32 When the meter is properly zero set the pointer rests over the zero calibra
26. ESIGNATORS A assembly F 7 fuse P plug vacuum tube neon more FL filter Q transistor photocell etc capacitor J jack R resistor CR diode E 1 x socket DL delay line BS Vesey RI IE XF fuseholder DS device signaling lamp L inductor 8 switch XV tube socket E misc electronic part M meter T 7 transformer XDS lampholder ABBREVIATIONS bp bandpass elect electrolytic mtg mounting rot rotary bwo backward wave encap encapsulated my mylar rms root mean square oscillator rmo rack mount only f 7 farads NC normally closed c carbon fxd fixed Ne neon s b slow blow ceramic normally open Se selenium cmo cabinet mount only Ge germanium NPO negative positive sect section s coef coefficient grd ground ed zero zero tem Si gilicon com common perature coefficient sl slide comp composition h henries nsr not separately conn connection Hg mercury replaceable td time delay crt cathode ray tube TiO 7 titanium dioxide impg impregnated obd order by de dep deposited incd incandescent scription tog toggle det detector ins insulation ed tol tolerance trim trimmer EIA Tubes and transistors K kilo pe printed circuit twt traveling wave tube selected for best board performance will be lin linear taper pi picofarads E supplied if ordered log logarithmic taper 10 12 farads x e E
27. IO2B NOT ASSIGNED CIOO CIO5 1 2 6AU8 R96 RIOO O OSIUF SIGNAL FROMCII3 RII8 lt lt a 10K AMPLIFIER OUTPUT m 0 ov MIO 0117 cns ES T sour 500UA EXPANDED RI22 10002 RI23 METER 500 CAL RACK MODEL RI24 3 lt NEGATIVE FEEDBACK 6 TO 7 VOLTS FROM POWER SUPPLY Figure 5 15 Model 413A DC Null Voltmeter 5 13 Model 413A Section Figure 5 16 Ajddng 9I G 310314 vu 22 0313130 gv6El 1L Sd 204 jnouj Moe NET JO esi jeqjo pesn eq jou s usw SISSVHI 9NILVO14 4 72 dinbe jo e upuejuru 20 s 841 7831715 35 10 SS31Nn SWHO NI SINIYA Y l 4 AS 1961 IHOlNAdOO S31ON SYOLVNOISSG 39N3H343H OL SLIOA 4 0L9 3n10 0 812 01015 OL MO1v1n934 AYO 15 ASSZ 431311938 01138 2 5 14 Model 413A Section VI Paragraphs 6 1 to 6 7 SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for or
28. Inc York Weston Inst Div of Daystrom Inc Newark N J Wollensak Optical Co Rochester Allen Mfg Co Hartford Conn Allied Control Co Inc York Atlantic India Rubber Works Inc Chicago Ill Amperite Co Inc New York N Belden Mfg Co Chicago Ill Bird Electronic Corp Cleveland Ohio Birnbach Radio Co New York N Y Boston Gear Works Div of Murray Co of Texas Bud Radio Inc Camloc Fastener Corp Allen D Cardwell Electronic Paramus Prod Corp Plainville Conn Bussmann Fuse Div of McGraw Edison St Louis CTS Corp Elkhart Ind Cannon Electric Co Cinema Engineering Co C P Clare A Co Standard Thomson Cor Clifford Mfg Co Di Waltham Mass Centralab Div of Globe Union Inc Milwaukee Wis The Cornish Wire Co New York N Y Chicago Miniature Lamp Works Chicago Smith Corp Crowley Div West Orange Chicago III Midland Mich Los Angeles Calif Burbank Calif Chicago Ill Cinch Mfg Corp Dow Corning Corp Electro Motive Mfg Co Inc Willimantic Conn John E Fast Chicago IIl Dialight Corp Brooklyn General Ceramics Corp Keasbey N J Girard Hopkins Oakland Calif Drake Mig Co Hugh Eby Inc Gudeman Erie Resistor Corp Hansen Mfg Co Inc Princeton Helipot Div of Instruments Inc Fullerton Calif Hughes Products Division of lughes Ai
29. Indicator under 4 413A DC Null Voltmeter adjacent to the 413A under test Paragraph 5 38 Gain Calibration Step h Change to read m Adjust Meter Cal R123 for an end scale reading of 1 volt on the 413A under test Step i Change to Step h and change first sentence to read Repeat Steps c through f using positive test voltages ranging from 0 001 volt through 300 volts from the voltmeter calibrator Step j Change to Step i and change the two references to Step i to read Step h Change Step k to j and m tok Figure 5 15 Model 413A DC Null Voltmeter Change Reference Designators for 5101 to S101A D F H Add an asterisk to R122 Add the following to NOTES 6 Average value shown optimum value selected at factory Change S101B to S101D Add S101A to the undesignated switch sections appearing on the left side of simplified diagrams of S101A and S101D switching Add S101D to the undesignated switch sections appearing on the right side of simplified diagrams of S101A and S101D switching Table 6 1 Reference Designation Index Change to 0 Stock No 1902 0206 Diode breakdown Mfr 04713 3 31 64 R Supplement A for 413A 900 WARRANTY All our products are warranted against defects in materials and workmanship for one year from the date of shipment Our obligation is limited to repairing or replacing products except tubes which prove to be defect
30. MS FOR SIOIA 8 SIOIB SHOWN BELOW R82 R76 6 155M R84 2 845M AMPLIFIER 003 VOLT RANGE R80 R86 001 VOLT RANGE R76 28 M 46 3 R76 SIOIA 51018 03 VOLT RANGE R77 R80 R87 R76 SI 198 1M 284K 51018 Ol VOLT RANGE R80 R76 28 1M SIOIB VOLT RANGE 3 TO 1000 VOLT RANGES FR SIMPLIFIED DIAGRAM OF SIOIA amp SIOIB SWITCHING 01138 2 Section Figure 5 15 2281 4 255 389 47K RIOS RIO9 RIS AIO T 20UF iM IM 100K 820K INPUT CIRCUIT ASSEMBLY AMPLIFIER AMPLIFIER I VIOIA 8 VIOIB VIO2A 2 1 2 6AUB cis 59V 99V Sd cios clog To 0 01 UF O O1UF amp 2 DEMODULATOR EN 5 SIGNAL gt 5 A 40 paran pr 1 Y I DOE wA BENI ov N 3 820 3 E 0 02UF N 2 R95 RIOS clo7 1 180 RIOT RIOS RII 22 Lem 47M FT RM 10K 22M 2 7M 1000 sour T COPYRIGHT 196 BY HEWLETT PACKARD COMPANY This drawing is intended for the operation ond maintenance of Hewlett Packard equip ment and is not to be used otherwise or reproduced without written consent of the Hewlett Packard Company 413 50 139 S63 vac REFERENCE DESIGNATORS AIO3 c99 ciiB o ASSEMBLY 05101 05104 0101 4103 Ce INDICATES PHASE MIOI R76 RI24 ES NOTIS SIOIA E SIO2 Viol 102 CATHODE o FOLLOWER V
31. NSULATOR COAX PIN2 VIOIA SHIELD CONNECTION COAX CONNECTION AMPLIFIER CIRCUIT BOARD RETAINING SCREW ASSEMBLY FOR AIOI MODULATOR CONTROL SHIELD Figure 5 3 Exploded View Showing Disassembly for Modulator Replacement 5 16 DEMODULATOR 5 17 The demodulator assembly A104 is located behind the meter between the main chassis and the power transformer see figures 5 4 and 5 13 Pro ceed as follows a Unplug the 413A from the power source and re move the cabinet see paragraph 5 5 b Remove V102 Remove DS103 figure 5 1 from chopper assem bly A103 d Connect a 1 uf capacitor across the input ter minals of the ohmmeter Connect the ohmmeter common lead to the de modulator terminal which has the pink orange lead connected to it f Connect the other ohmmeter lead to the terminal which has the white orange lead connected to it 01138 1 g Plug the 413A into the power source and turn it ON h Note resistance indicated on the ohmmeter Typical resistance is between 1 and 2 megohms 1 Turn the 413A off and unplug it from the power source j Replace DS101 and remove DS102 Connect the ohmmeter common lead to the de modulator terminal which has the brown orange lead connected to it m Connect the other lead from the ohmmeter to the terminal which has the white orange lead nected to it n Plug the 413A into the power source turn it ON and note the
32. Ohio 76854 Oak Manufacturing Co Chicago III 77068 Bendix Pacific Division of Bendix Corp No Hollywood Calif 77221 Phaostron Instrument and Electronic South 77142 Potter and Brumfield Div of an Machine and Foundry Princeton Ind 77630 Radio Condenser Co Camden N J 77 38 Radio Receptor Inc Brooklyn 77764 Resistance Products Harrisburg 78283 Signal Indicator Corp New York N Y 78471 Tilley Mfg Co San Francisco Calif 78488 Stackpole Carbon St Marys Pa 78553 Tinnerman Products Inc Cleveland Ohio 78790 Transformer Engineers Pasadena Calif 78347 Ucinite Co Newtonville Mass 79142 Voader Root Inc Hartford Conn 79251 Wanco Mfg Co Chicago III 79727 Continental Wirt Electronics Corp Philadetphia 79963 Zierick Mig Corp New Rochelle 80031 Mepco Division of Sessions Clock Morristown N J 80130 Times Facsimile Corp New York N Y 80131 Electronic Industrias Association Any brand tube meeting EIA standar Washington D C 80207 Unimax Switch Div of W L Maxson Corp Wallingford Conn 80248 Oxford Electric Corp Chicago IIl 80294 Bourns Laboratories Inc Riverside Calif 80411 Acro Div of Robertshaw Fulton Controls Co Columbus 16 Ohio 80486 All Star Products Inc Defiance Ohio 80583 Hammerlund Co Inc New York N Y 80640 Stevens Arnold Co Inc Boston Mass 81030 International Instruments Inc New Haven Conn 81415 Witkor Produc
33. Sealectro Corp 98405 Carad Corp 78724 Palo Alto Engineering Inc 98821 North Hills Electric Co 98925 Clevite Transistor Prod Div of Clevite Corp International Electronic Research Corp Columbia Technical Corp Varian Associates Marshall Industries Electron Products Division Pasadena Calit Control Switch Division Controls Co of America El Segundo Calif Delevan Electronics Corp East Aurora N Y Wilco Corporation Indianapolis Ind Renbrandt Inc Boston Mass Hoffman Semiconductor Diy of Hoffman Electronies Corp Technology Instrument Corp of Cali Newbury Park Calif Danvers Mass 98141 Palo Alto Calif Mineola Waltham Mass Burbank Calif Now York N Y Palo Alto Calif 99978 99109 99313 99515 99707 99800 39848 99934 99942 99957 Evanston Ill THE FOLLOWING H P VENDORS HAYE NO NUM BER ASSIGNED THE LATEST SUPPLEMENT TO THE FEDERAL SUPPLY CODE FOR MANUFACTURERS HANDBOOK 0000F Malco Tool and Die 00001 Telefunken c o American Elite Los Angeles Calif New York N Y 0000L Winchester Electronics Inc Santa Monica Calif 0000 M Western Coil Div of Automatic Ind Ine Redwood City Calif 0000N Nehm Bros Spring Co Leandro Calif 0000P Mfg Co Inc Holliston Mass 00007 Texas Instruments Inc Metals and Controls Div 0000U Tower Mfg Corp 0000 W Webster Electronics Co Inc Versailles Provid
34. Voltage Voltage Source 01138 1 Instrument Type Minimum Required Specifications Recommended Instruments Sensitivity 0 01 volt em minimum Frequency Response flat down to Sensitivity 0 05 volt full scale Input Resistance 10 megohms or Variation from at least 102 to Ranges to at least 10 megohms between 1 and 2 volts 413A Amplifier Calibration Model 738AR Voltmeter Calibrator For 10 cps hum Model 120AR Oscilloscope measurements and modulator check Model 412A or 413A Vacuum Tube Voltmeters Troubleshooting and amplifier gain calibration Power supply General Radio W1OMT3A check Metered Variac Auto transformer 4 Model 4108 or 412A Vacuum Tube Voltmeters Troubleshooting Amplifier Gain Calibration Burgess Burgess No 2 Size D flashlight cell or equivalent 5 1 Section Paragraphs 5 10 to 5 15 front panel indications A good method is to follow the performance verification procedure paragraph 5 40 until the trouble manifests itself as a reading that is out of the listed specifications For example if the instrument operates properly on all voltage ranges but 003 only R82 R84 or associated switch contacts and wiring can be faulty A bad reading on all ranges indicates trouble in the modulator ampli fier demodulator system or in the power supply Note The 413A is a sensitive instrument If it gives unexpected readings on its lowest v
35. age by using a low power soldering iron 50 watts maximum and following these instructions Copper that lifts off the board should be cemented in place with a quick drying acetate base cement having good electrical insulating properties A break in the copper should be repaired by soldering a short length of tinned copper wire across the break Use only high quality rosin core solder when repairing etched circuit boards NEVER USE PASTE FLUX After soldering clean off any excess flux and coat the repaired area with a high quality electrical varnish or lacquer When replacing components with multiple mounting pins such as tube sockets electrolytic capacitors and potentiometers it will be necessary to lift each pin slightly working around the components several times until it is free WARNING If the specific instructions outlined in the steps below regarding etched circuit boards without eyelets are not followed extensive damage to the etched circuit board will result 1 Apply heat sparingly to lead of component to be 2 Reheat solder in vacant eyelet and quickly in replaced If lead of component passes through sert a small awl to clean inside ofhole If hole an eyelet inthe circuit board apply heat on com does not have an eyelet insert awl a 57 ponent side of board If lead of component does drill from conductor side of board not pass through an eyelet apply heat to con ductor side of board CONDUCTOR SIDE Bend clean tinne
36. an end scale reading of 1 volt on the 413A 1 Repeat steps 7 8 and 9 using positive test volt ages ranging from 0 001 volts through 300 volts from the voltmeter calibrator Set the 413A RANGE VOLTS switch to the appropriate range for each voltage Record the error readings of all ranges taking into account the algebraic sign of error observed j Reverse the battery connection in the test setup in figure 5 8 and repeat step i using negative test voltages If necessary standardize the accuracy indicator for negative voltages Follow paragraph 5 37 steps a through i with battery connections reversed k Study the error readings and determine a new setting for R119 Gain Cal that will result in the best overall error figures for the entire voltage range Adjust 119 for this new value on some venient range The final setting must reduce error on any scale to less than 1 5 on the accuracy indicator and 2 of end scale on the 413A meter 5 40 PERFORMANCE VERIFICATION 5 41 The following procedure is to verify proper operation and should be accomplished with the instru ment in its cabinet This check may be made as a final test for routine maintenance or as a part of your incoming quality control inspection to verify listed specifications If the instrument fails any of the following tests refer to paragraph 5 29 Adjustment Procedure Proceed as follows Note The following procedures assum
37. complete the maintenance instructions in this section Instruments other than those recom mended may be used provided their performance meets the basic requirements given in table 5 1 5 5 CABINET REMOVAL 5 6 To remove the 413A cabinet proceed as follows Unplug power cord from the power source b Remove the two retaining screws on the rear of the instrument three screws for the rack mounted 413AR Slide the instrument chassis forward out of the cabinet Bezel ring remains attached to the front panel CAUTION Do not lubricate the RANGE VOLTS switch or touch the switch wafers with the fingers in the following procedures Wear a pair of light cotton gloves when handling the switch since skin oils and acids can contaminate the switch wafers and degrade instrument performance 5 7 TROUBLESHOOTING 5 8 GENERAL 5 9 The following paragraph gives information to aid in the localization of troubles in the 413A In most cases a trouble may be localized to a section from Table 5 1 Equipment Required Voltmeter Calibra Output Voltage Range 001 to tion Generator 300 volts Signal Frequency dc 0 25 Accuracy Low Frequency Oscilloscope at least 10 cps Electronic Volt meter higher Variable Power Transformer 128 volts Current Capabilities at least 1 ampere Monitor Voltmeter accurate to at least 1 volt Ohmmeter Accuracy 5 full scale
38. ction switches for 1 volt de out n Check meter tracking in 1 10 volt increments for both plus and minus input voltages Meter tracking should be correct within 4 2 of end scale Note When checking the 413A on the 003 and 001 volt ranges set the voltmeter calibrator selector switch to OFF and reset ZERO control for a meter reading of zero 5 8 Model 413A 5 43 AC REJECTION a With 413A INPUT open set 413A RANGE VOLTS 03 Set ZERO for a zero indication on the 413A meter b Connect a source of 6 3 volts ac with no dc level across the 413A input Any change in the 413A meter reading should be less than 1 5 44 AMPLIFIER OUTPUT a Connect a voltmeter calibrator and the accuracy indicator paragraph 5 37 to the 413A as shown in figure 5 10 b Switch accuracy indicator range switch to 03 Set 413A RANGE VOLTS switch to 1 d Switch voltmeter calibrator function and range switches to 1 volt Accuracy indicator should indicate less than 1 5 error f Repeat steps to d for 1 volt dj dp 4 DC NULL VOLTMETER UNDER TEST DC NULL VOLTMETER VOLTMETER CALIBRATOR DC AMPL oureur OR aiza VACUUM TUBE VOLTMETER Figure 5 10 Performance Test Amplifier Setup 01138 1 Model 413A Section Figure 5 11 SERVICING ETCHED CIRCUIT BOARDS Excessive heat or pressure can lift the copper strip from the board Avoid dam
39. d leads on new part and care 4 Hold part against board avoid overheating and fully insert through eyelets or holes in board solder leads Apply heat to component leads on correct side of board as explained in step 1 In the event that either the circuit board has been damaged or the conventional method is impractical use method shown below This is especially applicable for circuit boards without eyelets 1 Clip lead as shown below 2 Bend protruding leads upward Bend lead of new component around protruding lead Apply solder using a pair of long nose pliers asa heat sink APPLY SOLDER 1080000 Figure 5 11 Servicing Etched Circuit Boards 01138 1 Section Model 413A Figure 5 12 R3 HUM BAL O23vd 1200 0016 4j 510 RANGE VOLTS MP S 934 Figure 5 12 Model 413A Right Side View 5 10 01138 1 Section Model 413A Figure 5 14 CRI RIIG BIAS ADJUST AIOI INPUT CIRCUIT ASSY AMPLIFIER CIRCUIT BOARD ASSY RII9 GAIN CAL RANGE VOLTS 1 Figure 5 14 Model 413A Bottom View 5 12 01138 1 Model 413A 576 R92 R93 R94 12 5 3895 1230 389 l DC VOLTAGES REFERENCED TO WITH LINE VOLTAGE AT 115 AND NO METER DEFLECTION 2 ALL RESISTANCE VALUES OHMS CAPACITANCE IN PF UNLESS OTHERWISE NOTED 3 5 FLOATING CHASSIS GROUND GROUND SWITCHES SHOWN FULLY CCW VIEWED FROM FRONT PANEL 5 SIMPLIFIED DIAGRA
40. d to the modulator In figure 4 3 how ever B101 has turned the shutter assembly sufficiently to turn off the light source to V1 and turn on the light 05101 to V2 Now the resistance of V1 will return to its high dark resistance whereas the resistance of V2 will be very low The voltage to the amplifier will now be some very low voltage determined by the ratio of the photoconductor resistances This action continues resulting in a square wave signal of 5 6 line frequency 4 8 AC AMPLIFIER The ac amplifier consisting of V101AB and V102A is a conventional circuit which amplifies the modulator output about 500 000 times The output from V102A is fed to demodulator unit A104 which is synchronized with the modulator Theopera tion of the demodulator is similar to the modulator but its action is essentially the reverse e g to change the square wave output from the amplifier back to dc so sio RIIG Figure 4 3 Modulator Demodulator Operation Phase Two Section IV Paragraphs 4 9 to 4 12 4 9 DC OUTPUT CIRCUITS 4 10 The output from the demodulator is filtered by C114 116 and R114 118 and fed to cathode follower V102B Cathode follower bias is set by adjusting R116 Bias Adjust The output of V102B is used for the following purposes a For meter deflection R123 is used to adjust the meter current to the correct value b To provide a de output voltage proportional to meter deflection This volta
41. dering replacement parts Table 6 1 lists parts in alpha numerical order of their reference designators and indicates the description and stock number of each part together with any applicable notes Table 6 2 lists parts in alpha numerical order of their stock numbers and provides the following information on each part a Description of the part see list of abbreviations below b Manufacturer of the part in a five digit code see list of manufacturers in appendix c Typical manufacturer s stock number d Total quantity used in the instrument TQ column e Recommended spare part quantity for complete maintenance during one year of isolated service RS column 6 3 Miscellaneous parts not indexed in table 6 1 are listed at the end of table 6 2 6 4 ORDERING INFORMATION 6 5 To order a replacement part address order or inquiry either to your authorized Hewlett Packard sales representative or to CUSTOMER SERVICE Hewlett Packard Company 395 Page Mill Road Palo Alto California or in Western Europe to Hewlett Packard S A Rue du Vieux Billard No 1 Geneva Switzerland 6 6 Specify the following information for each part a Model and complete serial number of instrument b Hewlett Packard stock number Circuit reference designator d Description 6 7 To order a part not listed in tables 6 1 and 6 2 give a complete description of the part andinclude its function and location REFERENCE D
42. e correct mechanical zero on the 413A meter para graph 5 31 5 42 VOLTMETER a Turn the voltmeter calibration generator on and allow a 20 minute warmup b Switch the voltmeter calibrator fufiction switch to OFF and connect the output connectors tothe 413A INPUT as shown in figure 5 9 5 7 Section V Paragraphs 5 43 to 5 44 Connect the 413A to the variable power source set line voltage to rated value 115 or 230 volts and turn the 413A ON Allow 15 minutes for the instrument to warm up d Turn 413A RANGE VOLTS switch fully clockwise one step past 1000 and observe the 413A meter e Adjust R116 Bias Adjust for a zero indication 20 on the meter see paragraph 5 34 f Switch 413A ZERO to NORMAL and adjust the ZERO control for an exact zero reading on the 413A meter g Switch 413A RANGE VOLTS to 300 and set voltmeter calibrator output to 300 volts de WARNING The 738AR Voltmeter Calibrator output is a constant voltage source and can be dangerous Be careful not to touch the output leads with out first tuning OUTPUT SELECTOR OFF h The 413A meter should read 300 volts 2 of end scale i Vary line voltage between 103 and 127 volts Meter reading sheuld be unaffected j Repeat steps h and i for 300 volts Check end scale readings for the remaining ranges Specifications are 2 of end scale m Switch 413A RANGE VOLTS to 1 set volt meter calibrator range and fun
43. eet its published specifications when it was shipped from the factory 1 12 It further certifies thatits calibration measure ments are traceable to the National Bureau of Standards to the extent allowed by the Bureau s certification facility 1 13 Adjustments should not be attempted unless malfunction has been definitely established by follow ing the performance verification check in paragraph 5 40 of this manual 1 1 Section II Figure 2 1 and 2 2 2 0 DC AMPLIFIER OUTPUT TERMINALS Si 15V 4 SWITCH gt 230V MP S 936 Figure 2 1 230 Volt Operation Figure 2 2 Rack Mount Unit Model 413A MP S 937 01138 1 Model 413A Section II Paragraphs 2 1 to 2 11 SECTION II i PREPARATION FOR USE 2 1 INCOMING INSPECTION 2 2 MECHANICAL INSPECTION Care is taken in packing Hewlett Packard instruments to assure un damaged delivery Despite these precautions however damage in shipment will sometimes occur Upon re ceipt of your 413A check the contents against the packing list and inspect the instrument for any obvious damage received in transit If damage is evident file claim with the carrier To facilitate reshipment keep the packing material until an operational check has been made see paragraph 2 3 Referto the war ranty sheet in this manual for additional information 2 3 OPERATIONAL CHECK Paragraph 5 40 in cludes an in cabinet check for verifying proper instru ment opera
44. ence R I 0000X Spruce Pine Mica Co Spruce Pine 0000Y Midland Mfg Inc Kansas City Kans 00002 Willow Leather Products Corp Newark N J 000AA British Radio Electronics Ltd Washington D C 000 B8 Precision Instrument Components Co n Nuys Calif 000 C Computer Diode Corp Lodi N J 000 D D General Transistor Los Angeles Calif 000EE A Williams Manufacturing San Jose Calif 000FF Carmichael Corrugated Specialties Richmond Calif 0006 Goshen Die Cutting Service From F S C Handbook Supplements H4 1 Dated October 1961 H4 2 Dated November 1961 01138 1 MANUAL CHANGES MODEL 413A DC NULL VOLTMETER Manual Serial Prefixed 139 Manual Printed 2 62 To adapt this manual to instruments with other serial prefixes check for errata below and make changes shown in tables Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes ERRATA Figure 5 16 Power Supply schematic diagram Center arm of R8 ZERO should be connected to R125 126 and S101H F1 115V Change to fuse cartridge 0 6 amp slo blo for 115V operation d Stock No 2110 0016 F1 230V Change to fuse cartridge 0 4 amp slo blo for 230V operation 4 Stock 2110 0019 Paragraph 5 16 DEMODULATOR j should read Replace 05103 and remove DS104 p Turn the 413A off and replace DS104 and V102 Paragraph 5 35 Step a Change to 413A or 412A
45. g post black AC 10C Binding post black AC 10D Binding post red AC 54B Insulator binding post black 3 hole AC 54F Insulator binding post black 3 hole AC 10C Binding post black rmo AC 10C Binding post black rmo AC 10D Binding post red rmo AC 54B Insulator binding post black 3 hole rmo AC 54F Insulator binding post black 3 hole rmo M1 thru M100 Not assigned M101 413A 81A Meter calibrated 8120 0050 Cord power w NEMA plug P1 R1 0690 5611 R fxd comp 560 ohms 10 1W R2 0690 1211 fxd comp 120 ohms 10 1 W See introduction to this section 01138 2 6 3 Section VI Model 413A Table 6 1 Table 6 1 Reference Designation Index Cont d eference R3 2100 0078 var ww lin 500 ohms 30 3 10W Not assigned 0727 0233 R fxd c 333K ohms 10 1 2 W 0727 0124 fxd dep ohms 1 1 2 W R8 nsr part of 5102 R9 0727 0167 R fxd dep c 13 7K ohms 1 1 2 W R10 0813 0018 fxd ww 2 8K ohms 10 5W R11 thru R75 Not assigned R 16 0727 0274 fxd dep 1 19 1 2 W 0733 0014 fxd dep 70M 1 2 2 0730 0150 fxd dep 50M 1 2 1W 0730 0149 fxd c 28 1 1 2 1W 0730 0134 fxd dep c 8 1 1 2 1W 0730 0128 fxd dep c 6 155M 1 2 1W 0727 0262 fxd dep 900K ohms 1 2 1 2W 0730 0117 fxd
46. ge is available at the de amplifier output terminals For feedback to the modulator assembly A102 and the filter network Thenegative feedback adjusted with R119 Gain Cal stabilizes the dc gain of the Model 413A modulator amplifier demodulator system to a value of 1111 thereby providing an output of 1 volt for an input of 0 9 millivolts 4 11 POWER SUPPLY 4 12 The 413A power supply is a conventional full wave rectifier with resistors R1 R2 and zener diode in the power transformer center tap to develop the 6 to 7 volts for the cathode follower bias Re sistor R8 ZERO adjusts meter zero by changing the de bias of the modulator amplifier demodulator net work Switch 52 changes 1 primary circuit for 230 volt operation A fuse of different rating must be used in case of 230 volt operation see Table of Replaceable Parts 01138 1 Model 413A Paragraphs 5 1 to 5 9 SECTION V MAINTENANCE 5 1 INTRODUCTION 5 2 This section contains test and maintenance in formation for the Model 413A DC Null Voltmeter A performance check is included paragraph 5 40 that may be used to verify operation within published speci fications This check should be made with the instru ment in its cabinet and is a good test as part of routine maintenance or as a part of your incoming inspection 5 3 TEST INSTRUMENTS REQUIRED 5 4 Table 5 1 lists the test equipment that is re quired to
47. ive during the warranty period We are not liable for consequential damages For assistance of any kind including help with instruments under warranty contact your authorized dp Sales Representative for instructions Give full details of the difficulty and include the instrument model and serial numbers Service data or shipping instructions will be promptly sent to you There will be no charge for repair of instruments under warranty except transportation charges Estimates of charges for non warranty or other service work will always be supplied if requested before work begins CLAIM FOR DAMAGE IN SHIPMENT Your instrument should be inspected and tested as soon as it is received The instrument is insured for safe delivery If the instrument is damaged in any way or fails to operate properly file a claim with the carrier or if insured separately with the insurance company SHIPPING On receipt of shipping instructions forward the instrument prepaid to the destination indicated You may use the original shipping carton or any strong container Wrap the instrument in heavy paper or a plastic bag and surround it with three or four inches of shock absorbing material to cushion it firmly and prevent movement inside the container GENERAL Your authorized 4 Sales Representative is ready to assist you in any situation and you are always wel come to get directly in touch with Hewlett Packard service departments CUSTOMER SERVICE OR In We
48. les Calif Carl E Holmes Corp Los Angeles Calif Allen Bradley Co Milwaukee Wis Litton Industries Inc Beverly Hills Calif Pacific Semiconductors Inc Culver City Calif ADDRESS Colton Calif Instruments Inc ansistor Products Div The Alliance Mfg Co Chassi Trak Corp Pacific Relays Inc Amerock Corp Rockford IN Pulse Engineering Co Santa Clara Calif Ferroxcube Corp of America Saugerties N Y Cole Mfg Co Palo Calif Amphenol Borg Electronics Corp Chicago III Indianapolis Van Nuys Calif Radio Corp of America Semiconductor and Materials Div Somarville N J Vocaline Co of America Inc Old Saybrook Conn Hopkins Engineering Co San Fernando Calif G E Semiconductor Products Dept Syracuse N Y Apex Machine Tool Dayton Ohio Eldema Corp El Monto Transitron Electronic Corp Wakefield Mass Pyrofilm Resistor Co Morristown N J Air Marine Motors Inc Los Angeles Calif Arrow Hart and Hegeman Elect Co Hartford Conn Elmenco Products Co New York N Y Hi Q Division of Aerovox Myrtle Beach S C in National Watch Co lectronies Division Division of jewlett Packard Co Sylvania Electric Prods Inc Electronic Tube Div Mountain View Calif Motorola Inc Semiconductor Prod Div Phoenix Arizona Filtron Co Inc Western Division Culver City Calif Automatic Electric Co Northlake III P M Motor Co Chicago
49. nc York N Y Stevens Mfg Co Inc Mansfield Ohio Insuline Van Norman Ind Ine Electronic Division Manchester N H Woburn Mass Industrial Components iv Receiving Tube Operation Quincy Mass Raytheon Mfg Co Semiconductor Div Newton Mass Scientific Radio Products Inc Loveland Colo Tung Sol Electric Inc Newark NJ Curtiss Wright Corp Electronics Di East Paterson NJ Tru Ohm Prod Div of Engineering and Mfg Co Chicago Ill Worcester Pressed Aluminum Corp Worcester Mass Allies Products Corp Continental Connector Corp Woodside Leecraft Mfg Co Inc New York N Y Lerco Electronics Inc National Coil Co Vitramon Inc Sheridan Wyo Bridgeport Conn CODE NO MANUFACTURER ADDRESS 95354 Methode Mig Co Chicago IIl 95987 Weckesser Co Chicago IIl 96067 Huggins Laboratories Sunnyvale Calif 96095 HI Q Division of Aerovox Olean N Y 96256 Thordarson Meissner Div of Maguire Industrias Inc Carmel IIl 96294 Solar Manufacturing Los Angeles Calif 96330 Carlton Screw Co Chicago IIl 96341 Microwave Associates Inc Burlington Mass 96501 Excel Transformer Oakland Calif 97539 97968 Automatic and Precision Mfg Co Yonkers CBS Electronics Div of C 8 9 Inc Axel Brothers Inc 38220 Francis L Mosley 98278 Microdot Inc 98291
50. nput Isolation Common Signal Rejection Power Dimensions Weight 01138 1 Table of Specifications TABLE OF SPECIFICATIONS Positive and negative voltages from 1 1000 volts end scale in 13 zero center ranges 2 of end scale Approximately end scale on any range 10 megohms on 1 3 and 10 millivolt ranges 30 megohms on 30 mv range 100 megohms on 100 mv range 200 megohms on 300 mv range and above A voltage at power line or twice power line frequency 40 db greater than end scale affects reading less than 1 Peak voltage must not exceed 1500 volts 0 001 to 1000 in 13 steps 1 1 2 0 2 Less than 0 1 rms of end scale on any range 1 volt for end scale deflection same polarity as input signal End scale cor responds to 1 0 on upper scale Maximum load current is 1 milliampere Less than 2 ohms at de Approximately 3 db at 1 cps 80 db at 50 and 60 cps Binding post Greater than 100 megohms shunted by 0 1 uf to case power line ground May be operated with up to 500 volts dc or 130 volts ac above ground 115 or 230 volts 10 50 to 60 cps approximately 35 watts Cabinet Mount 11 1 2 inches high 7 1 2 inches wide 10 inches deep Rack Mount 4IZAR MAR Cabinet Mount Net 12 lbs shipping 17 lbs iii Section I Figure 1 1 1 0 Figure 1 1 Model 413A DC Null Voltmeter Model 413A 01138 1 Model 413A Section I Paragraphs
51. oblems of dc drift etc by first changing the dc to ac amplifying it and then changing it back to dc for application to the meter circuit and amplifier output connector Refer to figure 4 1 block diagram and to the schematic figures 5 15 and 5 16 for the fol lowing discussion 4 3 DC INPUT CIRCUITS 4 4 The input voltage is first fed to range attenuator S101AB where it is attenuated according to the setting of the RANGE VOLTS control The voltage is then fed through a low pass filter made up of R101 103 and C101 103 to a photoconductor modulator A102 The filter attenuates any ac components present in the input voltage 4 5 AC CIRCUITS 4 6 MODULATOR synchronous motor drives a lightinterrupter which controls the resistance of the photoconductors photosensitive resistors in A102 modulator and A104 demodulator units In TO RIO4 so s 103 RIIG Figure 4 2 Modulator Demodulator Operation Phase One 01138 1 order to simplify the following circuit explanation the modulator will be discussed alone However this discussion applies to demodulator operation as well 4 7 In figure 4 2 B101 has turned the light inter rupter and allowed the light source DS102 to shine on photoconductor V1 lowering its resistance to a few thousand ohms Since photoconductor V2 maintains its dark resistance of many megohms the voltage to the amplifier will be about the same as the dc voltage applie
52. olt age ranges it may be measuring thermo electric voltages etc in addition to the expected voltage see paragraph 3 3 5 10 AMPLIFIER POWER SUPPLY 5 11 Amplifier and power supply operation is best checked by voltage readings and tube substitution If tube substitution does not correct the difficulty return the original tube to the instrument If tubes are changed refer to table 5 2 for any necessary adjust ments Voltages are indicated at various points on the schematic diagrams figures 5 15 and 5 16 these are typical voltages and may vary somewhat from instrument to instrument 5 12 CHOPPER ASSEMBLY 5 13 Before the modulator or demodulator can be checked it must be ascertained that the chopper assembly A103 is functioning properly Refer to figure 5 1 for location of parts in the following steps Proceed as follows 05103 05104 DSIO4 413AR OPERATION 05103 41 INDICATOR 23 020 LIGHT 05102 DSIO INTERRUPTER DSIOI 4I3AR DSIO2 413AR Figure 5 1 A103 Chopper Assembly Model 413A a Remove cabinet paragraph 5 5 b Check all four lamps DS101 104 to make sure they glow when power is applied c Check the light interrupter in the cut away portion of the chopper assembly to see if the chopper blades are rotating A soldering aid may beinserted into the slot for a moment if necessary to check operation d If the chopper blades are not turning look at the moto
53. r operation indicator in the back of motor B101 If B101 is operating the chopper blade is loose on its shaft If not check the 6 3 volt circuit to the motor 5 14 MODULATOR 5 15 To check modulator operation proceed as follows a Unplug the 413A from the power source and remove the cabinet paragraph 5 5 b Remove V101 and reconnect the 413A to the power source c Connect a clip lead from the 413A input terminals to the center arm of R116 Bias Adjust Potentiometer d Set RANGE VOLTS 001 e Set oscilloscope input to DC f Connect one lead of an 8 2 megohm resistor to oscilloscope signal connector or probe Using a jumper wire connect the other resistor lead to the junction of R85 and 51010 point A in figure 5 5 Connect oscilloscope common lead to 413A common connector g Observe amplitude of the dc voltage at point h Move oscilloscope probe with resistor to point B in figure 5 3 i Waveform should be similar to that shown in figure 5 2 and should have a peak to peak amplitude approximately equal to the deflection found in step g Signal frequency should be 5 6 line frequency LO S 451 Figure 5 2 Approximate Chopper Waveform 01138 1 Model 413A BLK TO SIOIF AIO3 LUCITE RETAINING CHOPPER ASSEMBLY RODS BLK TO COLLARS CIRCUIT GROUND WHT RED TO 81267 51010 Section V Paragraphs 5 16 to 5 17 WHT TO SIOIE RIP RII9 INPUT CIRCUIT ASSEMBLY I
54. rcraft Co Newport Beach Calif Amperex Electronic Co Div of North American Phillips Co Inc Hicksville N Y Bradley Semiconductor Corp Hamden Conn Carling Electric Inc Hartford Conn George Garrett Inc Philas Fischer Special Mfg Co Ohio From F S C Handbook Supplements H4 1 Dated October 1961 H4 2 Dated November 1961 The General Industries Elyria Ohio Jennings Radio Mfg Co San Jose Calif J H Winns and Sons Winchester Mass i 1 APPENDIX Model 413A CODE LIST OF MANUFACTURERS Sheet 2 of 2 Appendix CODE NO MANUFACTURER ADDRESS 74861 Industrial Condenser Corp Chicago Ill 74968 R F Products Division of Amphenol Borg Electronics Corp Danbury Conn 74970 E F Johnson Waseca Minn 78042 International Resistance Philadelphia Pa 18173 Jones Howard B Division of Cinch Mfg Cori Chicago Ml 75878 James Knights Co Sandwich Ill 75382 Kulka Electric Corporation Mt Vernon N Y 75818 Lenz Electric Mfg Co Chicago II 75915 Littelfuse Inc Des Plaines IIl 74005 Lord Mfg Co Erie Pa 76210 C W Marwedal San Francisco Calif 76433 Micamold Electronic Mig Corp Brooklyn N Y 76487 James Millen Mfg Co Inc Malden Mass 76493 J W Miller Co Los Angeles Calif 74530 Monadnock Mills San Leandro Calif 76545 Mueller Electric Co Cleveland
55. rements of MIL I 169104 d Altitude O to 25 000 feet 2 1 Section Figure 3 1 3 0 Power switch Turns instrument ON Pilot Light Lights when instrument is RANGE VOLTS switch For selecting voltage range desired Amplifier Output terminals rear ofinstrument not shown Provides an output voltage pro portional to meter deflection NORMAL EXPANDED switch Model 413A 5 916 ZERO control Used to adjust electrical zero setting of meter Provides a choice of EXPANDED end scale or a NOR MAL 10 end scale range of zero adjustment INPUT connectors Apply voltage to be mea sured here 413A input is fully floating Figure 3 1 Operating Controls 01138 1 Model 413A Section Paragraphs 3 1 to 3 9 SECTION Ill OPERATING INSTRUCTIONS 3 1 INTRODUCTION 3 2 GENERAL This section contains information on the function and use of all controls on the Model 413A DC Null Voltmeter If more theoretical infor mation is desired refer to section IV Principles of Operation 3 3 LOW LEVEL ELECTRICAL PHENOMENA Stray low level electrical phenomena are present in one form or another in nearly all electrical circuits The 413A does not distinguish between stray and signal voltages it measures net voltage Thus when using the lower voltage ranges consider the possibility of low level electrical phenomena Thermocouples ther moelectric effect flexing of coa
56. s 101 DS101 thru DS104 fxd mica 820 pf 10 500 fxd cer 0 01 uf 20 1000 fxd cer 0 02 uf 80 20 600 vdcw fxd paper 0 47 uf 10 200 fxd my 0 051 uf 10 200 vdcw fxd my 0 1 uf 5 200 fxd my 0 1 uf 20 600 fxd poly 0 01 uf 10 50 vdew 0 0 fxd poly 0 1 uf 10 50 vdew fxd cer 2 sect 0 01uf sect 20 250 vdcw Section VI Table 6 2 Replaceable Parts Stock No Description Mfr Mfr Part No AC 10D AC 54A AC 54B AC 54E AC 54F G 31G 7H 412A 23B 412A 58A 412A 95A 413A 19A 413A 19B 413A 81A 425 9 RCM20B821K 29C214A3 H 1038 B 02 GMV DA171CB 109P47492 33M02151 6205 592684 114P1039R5S2 Type 114P Style T15 See introduction to this section 6 7 Section VI Model 413A Table 6 2 Table 6 2 Replaceable Parts Cont d 0180 0033 elect 50 uf 6 30D133A1 0180 0054 elect 1500 uf 10 D32495 0180 0086 elect 2 sect 20 uf sect 450 Type PL1 0180 0105 elect 50 uf 25 S97441 0687 1021 comp 1K ohms 10 1 2W EB1021 0687 1031 comp 10K ohms 10 1 2W EB1031 0687 1041 comp 100K ohms 10 1 2W EB1041 0687 1051 comp 1M 10 1 2W EB1051 0687 1821 comp 1 8K ohms 10 1 2W EB1821 0687 2261 comp 22M 10 1 2W EB2261 0687 2751
57. stern Europe Hewlett Packard Company Hewlett Packard S A 395 Page Mill Road 54 54bis Route Des Acacias Palo Alto California U S A Geneva Switzerland Telephone 415 326 1755 Telephone 022 42 81 50 TWX No PAL AL 117 U Cable HEWPACKSA Cable 00390 2
58. tion as given in published specifications If the Model 413A is to be operated from a 230 volt source refer to paragraph 2 8 2 4 RESHIPMENT 2 5 If after incoming inspection damage is evident repack the instrument inits original shipping container taking care to replace all pads in their original posi tions If the packing material was discarded contact your nearest Hewlett Packard sales office for infor mation and or packaging material If this is not possible the Model 413A should be packed ina strong exterior container and surrounded by 3 to 4 inches of cushioning material designed specifically for pack age cushioning 01138 1 2 6 INSTALLATION 2 7 No special installation procedures are required for the Model 413A cabinet model The Model 413AR rack mount figure 2 2 mounts in a standard 19 inch rack Amplifier output connectors are provided on both front and rear of the Model 413AR rack unit 2 8 230 VOLT OPERATION 2 9 If 230 volt operation is desired a screwdriver operated switch see figure 2 1 is provided on the rear of the instrument A fuse of different rating should be used See Table of Replaceable Parts in section VI 2 10 ENVIRONMENTAL LIMITS 2 11 The Model 413A is designed to operate within the following environmental conditions a Storage temperature 167 F 75 C to 40 F 40 C 9 Operating temperature 130 55 to 32 F 0 Radio interference meets the requi
59. tion mark on the meter scale when the instrument is 1 at normal operating temperature 2 in its normal operating position and 3 turned off Zero set as follows to obtain best accuracy and mechanical stability a Allow the instrument to operate for at least 20 minutes this allows meter movement to reach normal operating temperature b Turn instrument off and allow 30 seconds for all capacitors to discharge c Rotate mechanical zero adjustment screw clock wise until the meter pointer is to the left of zero and moving to the right toward zero d Continue to rotate adjustment screw clockwise stop when the pointer is right on zero If the pointer overshoots zero repeat steps c and d e When the pointer is exactly on zero rotate the adjustment screw approximately 15 degrees counter clockwise This is enough to free the adjustment Screw from the meter suspension If the pointer moves during this step you must repeat steps c through e 5 33 HUM BALANCE a Turn instrument on and allow a few minutes warmup b Set RANGE VOLTS selector to 1 c Connect oscilloscope to the dc amplifier output connector as shown in figure 5 6 d Adjust Hum Bal R3 for minimum 10 cps signal as seen on oscilloscope If power line fre quency is 50 cps adjust for minimum 8 1 3 cps signal See figure 5 13 for location of R3 5 6 Model 413A OSCILLOSCOPE dj 413A DC NULL VOLTMETER DC AMPLIFIER OUTPUT Figure
60. ts Inc Cleveland Ohio 81452 Raytheon Co Industrial ponents Div Industr Tube Operations Newton Mass 81483 International Rectifier Corp El Segundo Calif 81460 Barry Controls Inc Watertown Mass 82042 Carter Parts Co Skokie IIl 82142 rs Electronics Division of Du Pa 82170 Inc Clifton N J 82209 Inc Greenwich Conn 82219 Sylvania Electric Prod Inc Electronic Tube Div Emporium 82376 Astron Co East Newark N J 82389 Switchcraft Inc Chicago IIl 82647 Matals and Controls Inc Div of Texas Instruments Ine Spencer Prods Attleboro Mass 87865 Research Products Corp Madison Wis 00015 19 Revised 6 December 1961 82877 82893 83058 83125 83148 83186 83298 3330 83501 83594 83777 83821 84171 84396 84411 84970 85454 85474 85560 5911 96684 37216 87473 88140 89473 9636 89668 90179 90970 91260 91418 91506 91637 91662 91737 91827 91921 92196 93332 93369 93410 93983 94144 94145 94148 94154 94197 94310 94582 95236 95238 95263 95264 95265 95275 MANUFACTURER Rotron Manufacturing Co Inc Woodstock N Y Glendale Calif Cambridge Mass Darlington 5 Los Angeles Calif ADDRESS Vector Electronic Co Carr Fastener Co Pyramid Electric Co Electro Cords Co Victory Engineering Corp Union NJ ndix Corp Red Bank Div Red Bank N J Smith Herman H Inc Brooklyn
61. tts by stock numbers 3 pp peak to peak ier E tubes or transistors m mili 10 piv peak inverse E t meeting Electronic M megohms voltage Wa Industries Associa ma milliamperes position s 7 optimum value tion standards will minat miniature z normally result in a 5 mfg metal film on instrument operating glass within specifications mfr manufacturer 01138 2 selected at factory average value shown part may be omitted pos poly polystyrene pot potentiometer rect rectifier 6 1 Section VI Model 413A Table 6 1 Table 6 1 Reference Designation Index Circuit ircuil Rm A1 thru A100 Not assigned A101 412A 58A Assy input circuit includes A102 R101 thru R105 C101 thru C104 R119 C106 R120 C107 A102 412A 95A Assy modulator A103 425A 97A Assy chopper includes B101 DS101 thru DS104 A104 412A 23B Assy demodulator 105 413A 19A Assy range switch includes C99 R76 thru R95 R121 R127 101 A106 413A 19B Assy switch zero includes R6 thru R9 R125 R126 5102 B1 thru B100 Not assigned B101 3140 0013 Motor 6 3 VAC C1A B 0150 0119 fxd 0 01 20 250 vdcw C2 Not assigned C3A B 0180 0086 fxd elect 2 sect 20 uf sect 450 C4 0180 0054 fxd elect 1500 uf 10 C5 thru C98 Not assigned C99 0170 0019 C fxd my 0 1 uf 5 200 vdew C100 Not assigned C101 thru 0170 0030 fxd poly 0 1 uf 1 50
62. xial cables tribo electric effect apparent residual charges on capaci tors dielectric absorption battery action of two terminals mounted on an imperfect insulator galvanic action all can produce voltages within the range of the 413A 3 4 Whenever possible use copper wire leads and maintain the points of connection at the same tempera ture preferably ambient temperature With theleads so connected any voltage indicated by the 413A is developed within the circuit under test 3 5 CONTROLS 3 6 Figure 3 1 shows all operating controls and gives a short description of their use Numbers in figure 3 1 are given to relate the text in figure 3 1 to the photograph and do not necessarily indicate operational procedure see paragraph 3 7 More detailed information related to these controls is listed below a RANGE VOLTS switch The RANGE VOLTS switch adjusts the input circuit so that any voltage between 001 and 1000 volts may produce end scale deflection on the meter The last position of the RANGE VOLTS switch is used to adjust the cathode follower bias see paragraph 5 34 b INPUT terminals The voltage to be measured should be connected to these terminals Polarity is not important insofar as 413A operation is concerned However to prevent ac loading of the circuit under test the low impedance line should be connected to the right hand terminal since this terminal has the higher capacitance to ground ZERO
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