GENERAL RADIO COMPANY 1383, Instruction Manual

Page 1: ...INSTRUCTION MANUAL Type 1383 Random Noise Generator A GENERAL RADIO ...

Page 2: ...ial and workmanship and that properly used it will perform in full accordance with applicable specifications for a period of two years after original shipment Any instrument or component that is found within the two year period not to meet these standards after examination by our factory District Office or authorized repair agency personnel will be repaired or at our option replaced without charge...

Page 3: ...HR fUll Sf Alt Output Impedance 500 Can be shorted without causing distortion Amplitude Control Continuous control and 8 step 10 dB per step atten uator Output Terminals GR874 E coaxial connector that can be mounted on either front or rear panel Accessories Supplied Spare fu ses lamp power cord Power Required 100 to 125 or 200 to 250 V 50 to 400 Hz 40 W Dimensions width x height x depth Bench 17 x...

Page 4: ...and an output attenuator permits reduction of the output by a total of 80 dB in 10 dB steps f rom a max imum of 1 V rms open circu it The outpu t impedance is 50 S1 1 3 CONTROLS CONNECTORS AND INDICATORS The controls connectors and indicators on the front and rear panels of the 1383 Random Noise Generator are Iisted and described in Tables 1 1 and 1 2 respectively The OUTPUT connector on the front...

Page 5: ...s lnstrumerrt 2 Pilot lamp Indicates when instrument is energi zed 3 Meter Indicates open circu it output voltage 4 OUTPUT LE VEL Continuous rotary Varies output voltage control 5 METER FULL 9 position rotary 1 0 0 3 0 1 0 03 Attenuates output in 10 SCALE selector switch 0 01 0 003 0 001 dB steps 0 0003 0 0001 6 OUTPUT 50 D GR874 coaxial Connection to generator output connector and ground jack 1 2...

Page 6: ... on the rear panel Extraction post fuse holder Extraction post fuse holder Screwdriver operated slide switch 3 terminal male connector Table 1 3 100 125 200 250 Accessories Supplied Refer also to Parts List ITEM GR PART NO Power Cable 7 foot 4200 96L2 3 wire Spare Fuse 0 3 A 5330 0800 Slo Bio Spare Fuse 0 6 A 5330 1100 Slo Bio Spare Pilot Lamps 5600 0300 Holds 3 10 A fuse Sio Bio Holds 6 10 A fuse...

Page 7: ...cking 874 0BJL GR874 to BNC jack 0874 9701 874 0BPL GR874 to BNC plug 0874 9801 874 0UJL GR874 to UHF jack 0874 9719 874 02 GR874 to binding posts 0874 9870 Fixed Attenuators non locking 874 G3 3 dB 0874 9564 874 G6 6 dB 0874 9568 874 G10 10 dB 0874 9570 874 G14 14 dB 0874 9568 874 G20 20 dB 0874 9572 Fixed attenuators locking 874 G3L 3 dB 0874 9565 874 G6L 6 dB 0874 9569 874 G10L 10 dB 0874 9571 ...

Page 8: ...rovide a better view of the control settings To convert the bench model for relay rack use proceed Fig 2 2 No Ref Used as follows see Figure 2 2 a Order an 0480 9702 Rack Adaptor Set Table 2 1 G 2 lists the parts included in the Set b Loosen the two captive 10 32 screws 5 Figure 1 2 in the rear of the cabinet until the instrument is free slide the instrument forward out of the cabinet c Remove the...

Page 9: ...nserting a screwdriver through the holes F in the handles To convert the rack model to a bench model remove the rack adaptor set by reversing the procedure of paragraph 2 2 2 2 INSTALLATION 2 4 MOVING THE OUTPUT CONNECTOR To move the OUTPUT connector to the rear panel see Figure 8 2 a Loosen the two captive screws at the rear of the in strument 6 Fig 1 2 and remove the instrument from its cabinet ...

Page 10: ...d but for many noises we can speak of the probability that the voltage will lie in some particular range This probability is given by a function called the amplitude density distribution p v When multiplied by a voltage increment dv this function gives the probability 3 1 3 1 3 1 3 3 3 4 3 5 that at any given instant the voltage lies between v and v dv Because the voltage must exist at some value ...

Page 11: ...ving 1 volt rms amplitude are given in Table 3 2 A voltmeter re sponding to the average and calibrated to indicate the rms value of a sine wave wil l when measuring Gaussian noise indi cate a value that is low by the factor 0 798 0 900 0 887 1 05 dB 1 Voltmeters that respond to the true rms value are quite appropriate for the measurement of noise because they can indicate the rms value without cor...

Page 12: ...that resistance per unit bandwidth The spectral intensity is the Fourier transform of the autocorrela tion function and is the spectru m function most often used in mathematical analysis of random noise It is not the most con venient function for practical use owever because spectra are usually measured as voltage rather than voltage squared in a given bandwidth and filter responses used in shapin...

Page 13: ...lyzers such as the General Radio Type 1564 Sound and Vibration Analyzer or the Type 1558 Octave Band Analyzer multiply the analyzer voltage in dication by the appropriate conversion factor in Table 3 4 3 4 PROPERTIES OF RANDOM NOISE TABLE 3 4 Correction factors for converting voltage indication of a constant percentage bandwidth analyzer to voltage in a 1 hertz band BANDWIDTH 1 10 Octave 1 3 Octav...

Page 14: ...s of high frequency amp ifiers 7 The noise current it produces is proportional to the square root of 7spa ngenberg K R Vacuum Tubes M cGraw Hill Book Co Inc New Yor k 1948 p 307 the de plate current which in the 1383 is held constant by feedback controll ing the f ilament current The gain of the noise current amp ifiers is stabil ized by feedback 3 6 SUMMARY Because various terms used in speaking ...

Page 15: ...e amplitude stable the fi lament current of the noise diode is controlled by feedback to maintain a constant current The noise output of the diode is amplified in 4 1 PRINCIPLES OF OPERATION the frequency range from 40 to 80 MHz By heterodyning against a 60 M Hz local oscillator the noise frequency is translated to the 0 to 20 M Hz band A sharp cutoff low pass fil ter ensures t hat higher noise fr...

Page 16: ... 5 4 OUTPUT CONNECTIONS The output connector on the front panel is a GR874 locking type coaxial connector Generally the output shou ld be taken by means of a mating GR874 connector into a closed 5 1 5 1 5 1 5 1 5 1 5 1 coaxial system Adaptors to other types of high frequency connectors are available refer to Table 1 4 The output con nector can be moved to the rear panel if more convenient as when ...

Page 17: ...rated by using a double balanced mixer to modulate a high frequency carrier from an oscil lator or signal generator The result will be a band 5 2 OPERATING PROCEDURE of noise 40 MHz wide centered on the carrier frequency There will be a notch 40 Hz wide at the carrier frequency 1 The degree of discrimination against the carrier and the upper carrier frequency that can be used will depend upon the ...

Page 18: ... distortion 2 White noise which 1 Faran J J Jr Random Noise Generators General Radio Experimenter Vol 42 No 1 pp 3 13 January 1968 2MIL STD 1886 has been passed through a band stop filter that reduces the level of the noise by say 80 dB over a narrow range of fre quencies is applied to the input of a system Spectrum meas urements of the system output indicate how much the notch in the noise spectr...

Page 19: ...noise temperature see below is considerably lower than the ambient temperature The noise temperature of the output of the 1383 can never be less than its actual temperature because its output circuits are comprised of real resistances Fi r ure 6 1 shows how the noise temperature of the output varies with the amount of attenuation when the OUTPUT LEVEL control is set so that the meter indicates ful...

Page 20: ...els 6 i e noise figure is 10 log F 6 7 2 Measurement of Noise Factor or Noise Figure The simplest and most c9nvenient method of meas uring the noise factor of a receiver or amplifier is usually by use of a noise generator The measurement is similar to that used in the determination of effective input noise temperature The noise factor is Tih Tic F 2 0 1 P0 h P0 c 29Q 1 Poh Pod 1 where Tih is the n...

Page 21: ...quipment Instruments have been constructed especially for this purpose at General Radio and are used in checking noise generators before they are shipped The performance of this special ly constructed equipment is not readily duplicated by com mercially available instruments However given below are lists of equipment and instructions for checking these characteristics as well as possible with read...

Page 22: ...onstructed equ ipment is used at General Radio for check ing the amplitude distribution of noise generators before they leave the factory Customers fam iIiar with ampIitude distribution measurements may have suitable equipment on hand or at least wil l understand what sort of equ ipment is necessary and how to assemble it Others must make use of commercially available amplitude distribution analyz...

Page 23: ...istorti on as even small amounts of non linear distortion can have a serious effect on the amplitude distribut ion of a random noise signal Use of the B K Model 161 Amplitude Distribution Analyzer The B K Model 161 Amplitude Distribution Analyzer wi ll measure the amp litude density distribution of random noise When making such measurements on the output of the 1383 samp ling techniques will be ne...

Page 24: ...r s instructions will be found helpful The test setup is shown in Figure 7 6 GR 874 R22A TEKT RONIX 5 4 3 PATC H CORD SAMPLING OSCILLOSCOPE GR 138 3 RANDOM NOISE GE NERATOR T 7 2 4 Other Tests Output Attenuator Accuracy The accuracy of the output attenuator can be checked by comparison with some other attenuator such as that in the Rhode Schwarz USVH Selective Microvoltmeter The comparison can be ...

Page 25: ...tions for sh ielding when not pressed absolutely flat R327 This potentiometer adjusts the de bias conditions on the output stage to compensate for different current gains in the output transistors 0308 and 0309 Using a de voltmeter with the OUTPUT LEVEL control turned fully counterclockwise adjust R327 so that the voltage from the collector of 0309 to ground is 2 V positive A further refinement of...

Page 26: ...s to chassis ground Readings taken with 1806 Electronic Volt meter or equivalent TEST POINT DC TEST DC TEST DC VOLTS POINTS VOLTS POINTS VOLTS Amplifier 40 80 MH z 0101 E c 0102 E c 0 103 E c 0 104 E c 0 105 E c 0106 E c 0 107 E c 0 108 E c 0109 E c Local Osci llator 60 MHz 0201A E c 02018 E c 0202 E c 0 7 5 2 5 8 0 03 5 8 0 06 07 5 2 5 8 0 5 8 0 15 0 65 5 2 5 8 0 5 8 0 15 0 8 0 0 8 0 005 9 6 Vari...

Page 27: ...NSTALLAT ION To install a Snap on knob assemb ly on the control shaft a Place the black nylon thrust washer over the control shaft if appropriate b Mount the bushing on the shaft using sma ll slotted piece of wrapping paper as a sh im for adequate clearance c Orient the setscrew on the bushing with respect to the panel marking index and lock the setscrew with an Allen wrench NOTE Make sure that th...

Page 28: ...fg Co Chicago Ill 60624 Darnell Corp Ltd Downey Calif 90241 Electro Motive Mfg Co Wilmington Conn Nytronics Inc Berkeley Heights N J 07922 Dialight Co Brooklyn N Y 11237 General Instr Corp Newark N J 07 104 Drake Mfg Co Chicago Ill 60656 Hugh H Eby Inc Philadelphia Penn 19144 Elastic Stop Nut Corp Union N J 07083 Erie Technological Pro ducts Inc Erie Penn Beckman Inc Fullerton Calif 92634 Amperex ...

Page 29: ...r 5220 5402 5500 5321 24655 5500 5321 Cover Plate OUTPUT Cover Plate Complete 0480 2470 24655 0480 2470 Dress Nut For Power Toggle Switch 5310 344 3634 15 32 32 Dress 5800 0800 24655 5800 0800 Foot Rear black Neoprene Foot 5260 2060 24655 5260 2060 Foot Right front black Phenolic Foot for use with Bail 5250 2121 24655 5250 2121 Left front black Phenolic Foot for use with Bail 5250 2120 24655 5250 ...

Page 30: ...917 ATI02 C504 C503 F502 R923 T202 FSOI S502 ETCHED Cl RCUIT BOAR D P N 138 3 2750 S 5 01 T201 PLSOI Figure 8 1 Top interior view of the Generator R525 R923 R917 R 322 R924 0503 csos C506 5502 F502 C504 C507 Figure 8 2 Bottom interior view of the Generator C508 COVER PLATE P N 0480 2470 0308 0309 Y H T ETCHED CIRCUIT BOARD P N 1 383 2731 J90 1 8 3 ...

Page 31: ...7330 6082 1027 13327 MS7330 RESISTORS R101 Composition 47 Q 5 1 4 W 6099 0475 75042 BTS 47 Q 5 R102 Composition 560 Q 5 1 4 W 6099 1565 75042 BTS 560 Q 5 R103 Composition 90 9 Q 1 1 8 W 6250 9909 75042 CEA 90 9 Q 1 R104 Composition 10 Q 1 1 8 W 6250 0010 75042 CEA 10 Q 1 R105 Composition 510 Q 5 1 4 W 6099 1515 75042 BTS 510 Q 5 5905 801 82 72 R106 Composition 220 Q 5 1 4 W 6099 1225 75042 BTS 220...

Page 32: ...1047 24446 2N3416 Qll2 Type 2N3414 8210 1047 24446 2N3416 Q901 Type 2N3055 8210 1097 12672 40251 MISCELLANEOUS Ll 01 Ll02 T101 V901 Choke Molded 0 15 J JH 10 4300 0101 99800 1536 0 15 J JH 10 1536 0 15 J JH 10 Choke Molded 0 15 J JH 10 4300 0101 99800 Coil 5000 2711 24655 5000 2 711 Type 5722 8380 5722 82219 5722 103 1383 0710 5 Rll7 C l _ AO T Rli O RI14 0 150 A 017 0 etoe A 0 Rill Figure 8 3 Etc...

Page 33: ...N INSTRUCTION BOOK 3 REFER TO SERVICE NOTES IN INSTR UCTION BOOK FOR VOLTAGES APPEARING ON DIAGRAM 4 RESISTORS 1 4 WATT S RESISTANCE IN OHMS K 1000 OHMS M 1 MEGOHM 6 CAPACITANCE VALUES ONE AND OVER IN PICOFARADS LESS THAN ONE IN MICROFARADS 7 0 KNOB CONTROL 8 SCREWDRIVER CONTROL 9 AT ANCHOR TERMINAL 10 TP TEST POINT c EG B 0 0 0 ___ 0111 112 40 80 MHz AMPLIFIER Rl12 560 Rll5 51 0 ATIIO AT II CI07 ...

Page 34: ... 220 CIIB ATI04 J O RI2B 910 I I I I _ j TO AT201 r A T I0 4 9 W H GN B __ AT50B L Cl25 IOV AT532 FILAMENT REGULATOR e o e 0 EOc c 108 0901 0103 104 106 107 109 ECIFIED RESISTANCE IN OHMS K 1000 OHMS M 1 MEGOHM CAPACITANCE VALUES ONE AND OVER IN PICOFARADS LESS THAN ONE IN MICROFARADS Q KNOB CONTROL 8 SCREWDRIVER CONTROL AT ANCHOR TERMINAL TP TEST POINT c E8B 0 0 0 0111 112 ATill I _____ _j 0110 J...

Page 35: ...1155 75042 BTS I50 1 5 5905 683 2243 R205 Composition 4 7 k 1 5 l 4 W 6099 2475 75042 BTS 4 7 k 1 5 5905 686 9998 R206 Composition IO 1 5 l 4 W 6099 0105 75042 BTS IO 1 5 5905 809 8596 R207 Composition 20 1 5 I 4 W 6099 0205 75042 BTS 20 1 5 R 08 Composition 24 1 5 l 4 W 6099 0245 75042 BTS 24 n 5 R209 Composition 24 1 5 1 4 W 6099 0245 75042 BTS 24 1 5 R210 Composition 20 1 5 1 4 W 6099 0205 7504...

Page 36: ...e board is P N 1383 2721 Figure 8 6 The 20 MHz low pass filter is hidden by the regulator circuit etched board P N 1383 2741 refer to paragraph 4 1I NOTE The number appearing on the foil side is not the part number The dot on the foil at the transistor socket indicates the collector lead ...

Page 37: ...AINED ON SEPARATE SHEET SUPPLIED IN INSTRUCTION BOOK 3 REFER TO SERVICE NOTES IN INSTR UCTION BOOK FOR VOLTAGES APPEARING ON DIAGRAM 4 RESISTORS 1 2 WATI 5 RESISTANCE IN OHMS K 1000 OHMS M 1 MEGOHM 6 CAPACITANCE VALUES ONE AND OVER IN PICOFARADS LESS THAN ONE IN MICROFARADS 7 0 KNOB CONTROL 8 G SCREWDRIVER CONTROL 9 AT ANCHOR TERMINAL 10 TP TEST POINT T201 3 R203 1 5K I 7V I R205 4 7K BOARD R212 3...

Page 38: ... 0203 204 R203 I K I 7V I R20 4 7K BOARD MODULATOR R21 2 3K 1383 2721 R2 07 20 60 MHZ OSCILLATOR R214 910 R21 100 IR922 Tc902 2500 FILTER AT206 V 31 0 W H R 0 84R 32 I _j T C903 2 00 Figure 8 7 Schematic circuit diagram of the oscill ator modulator and 2 MHz low pass filter 8 7 ...

Page 39: ...5 01121 RC20GF471J 5905 192 3973 R302 Composition 620 n 5 1 2 W 6100 1625 01121 RC20GF621J 5905 279 1761 R303 Composition 330 n 5 1 2 W 6100 1335 01121 RC20GF331J 5905 192 3971 R304 Composition 51 n 5 1 2 W 6100 0515 01121 RC20GF510J 5905 279 3517 R305 Composition 510 n 5 1 2 W 6100 1515 01121 RC20GF511J 5905 279 3511 R306 Composition 220 n 5 1 2 W 6100 1225 01121 RC20GF221J 5905 279 3513 R307 Com...

Page 40: ...ilm 142 3 r 1 6610 1300 03888 A3AJ01 R914 Film 96 2 n 1 6610 1200 03888 A3AJ01 E R915 Film 142 3 r 1 6610 1300 03888 A3AJ01 R916 Film 65 8 n 1 6610 0900 03888 A3AG01 R923 Composition 100 n 5 1 2 W 6100 1105 01121 RC20GF101J 5905 190 8889 R924 Thermistor 100 n 10 6740 1606 02606 Type LB21J1 R925 Composition 22 n 5 6095 0022 01121 HM 22 n 5 MISCELLANEOUS CR301 Type IN3604 6082 1001 24446 IN3604 5961...

Page 41: ...3 2731 NOTE The number appearing on the foil side is not the part number The dot on the foil at the transistor socket indicates the collector lead SO R 301 1 CABLEI YE I I I I I SWI 1 POSITION OF R SHOWN COUNTI 2 CONTACT NUMB EXPLAINED ON SUPPLIED IN IN 3 REFER TO SERY UCTION BOOK I APPEARING ON 4 RESISTORS 1 2 ...

Page 42: ...IN MICR ARADS 7 Q KNOB CONTROL 8 SCREWDRIVER CONTROL 9 AT ANCHOR TER _ 10 TP TEST POINT IOV AT 30 BOARD 1383 2731 R316 510 R313 680 R317 110 R318 470 R320 2 4K AT 504 WH RO I R329 75 IW R330 536 118W IOV AT532 TC R92 22 4W TO Rotary switch sections are shown as viewed from the panel end of the shaft The first digit of the contact number refers to the sec tion The section nearest the panel is 1 the...

Page 43: ...ally and the ally 02 und the that the section L303 IO H R333 680 C309 330 F R336 910 METER CIRCUIT CR301 I 50302 R321 47 cw QR 2 AT307 WH VT GY 111901 CABLE BK 5901 5901 80d8 CABLE GN 203R 103t 102t J901 O IMY AT 906 _ VII v __ I 109F 2008 R924 t IOO AT908 _ fv J e IIOF IOdB I J L IIIF OdB METER FULL SCALE I Figure 8 9 Schematic circuit diagram of the video amplifier and attenuator 8 9 ...

Page 44: ...9 1N3253 5961 814 4251 CR508 Type 1N3253 6081 1001 79089 IN3253 5961 814 4251 CR509 Type IN3253 6081 1001 79089 IN3253 5961 814 4251 CR510 Type IN3253 6081 1001 79089 IN3253 5961 814 4251 CR511 Type IN3253 6081 1001 79089 IN3253 5961 814 4251 CR512 Type 1N3253 6081 1001 79089 IN3253 5961 814 4251 CR513 Type IN4009 6082 1012 24446 IN4009 5961 892 8700 CR514 Type 1N750A 6083 1028 07910 IN750A 5960 7...

Page 45: ...elector S0901 Tube T501 Power PARTS LIST Cont Part No FMC Mfg Part No Fed Stock No 6350 1511 75042 CEB 5 11 k J l 6100 2165 01121 RC20GF162J 5905 279 3507 6350 1442 75042 CEB 4 42 k J l 6100 1105 01121 RC20GF101J 5905 190 8889 6056 0138 11236 115 1 k J 10 5330 1100 71400 MDL 6 Amp 5920 280 3161 5330 0800 71400 MDL 3 Amp 5920 235 8362 4240 0600 91146 45002 5600 0309 71744 330 7910 1300 04009 83053 ...

Page 46: ...te board is P N 1383 2750 Figure 8 11 Etched circuit board assembly for the 10 V regulator circuit The complete board is P N 1383 2741 NOTE The number appearing on the foil side is not the part number The dot on the foil at the transistor socket indicates the collector lead ...

Page 47: ...AINED ON SEPARATE SHEET SUPPLIED IN INSTRUCTION BOOK 3 REFER TO SERVICE NOTES IN INSTR UCTION BOOK FOR VOLTAGES APPEARING ON DIAGRAM 4 RESISTORS 1 2 WATT 5 RESISTANCE IN OHMS K 1000 OHMS M 1 MEGOHM 6 CAPACITANCE VALUES ONE AND OVER IN PICOFARADS LESS THAN ONE IN MICROFARADS 7 0 KNOB CONTROL 8 SCREWDRIVER CONTROL 9 AT ANCHOR TERMINAL 10 TP TEST POINT ATI09 ATIII AT508 33 R515 33 R514 330 R516 2 2 2...

Page 48: ...GN Bt WH GN BR WH GN AT50B 33 Wtj BlJ BK AT528 R5l5 33 501 R505 C509 22 AT 23 01 2W WH GY BR AT 21 0503 CR513 R520 AT 30 I IOV C902 1 5K R521 W RO BK C512 ATI03 R509 470pt 5 11K AT304 R511 114W 330 510 R525 C514 cw IK 0 47 C511 200 R512 C513 CR514 R522 330 100 4 7V 16K AT531 AT903 C515 R513 200 330 0504 R514 330 C518 R523 0 47 4 42K WH f O R C520 114W IOV C903 15 AT532 ATI04 AT305 WH G I GN AT525 ...

Page 49: ...tional San Francisco Seoul Korea MALAYSIA and SINGAPORE Vanguard Company Kuala Lumpur Malaysia MEXICO Fredin S A Mexico O F NEW ZEALAND W K McLean Limited Auckland PAKISTAN Pakland Corporation Karachi PHILIPPINES T J Wolff Company Mllkati RIZIIII PORTUGAL and SPAIN Ad Auriem Inc New York Madrid Lisbon G H Langler Co Ltd Johannesburg SOUTH and CENTRAL AMERICA Ad Auriema Inc New York TAIWAN He ghten...

Page 50: ...GENERAL RADIO WEST CONCORD MASSACHUSETTS 01781 ...