GENERAL RADIO COMPANY 1398-A Operating Instructions Manual Download | Manualshive

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Summary of Contents for 1398-A

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Page 2: ...pe 1 3 9 6 A PULSE GENERATOR Form 1398 0100A ID 1032 March 1966 Copyright 1966 by General Radio Company West Concord Massachusetts USA G E N E R A L R A D I O C O M P A N Y W E S T C O N C O R D M A S S A C H U S E T T S U S A ...

Page 3: ...ns 10 3 8 Output Dc Component Dc Translation 11 3 9 Locking on High Frequency Signals 12 3 10 Count Down Operation 12 3 1 1 Single Pulse Operation 12 3 12 Use as a Delay Generator 12 3 13 Use for Complex Waveforms 13 Section 4 PRINCIPLES OF OPERATION 14 4 1 General 14 4 2 Input and PRF Oscillator Circuit External Operation 14 4 3 Input and PRF Oscillator Circuit Internal Operation 15 4 4 Output Pu...

Page 4: ...of ampli tude with correct termination Ramp off Less than 1 Synchronizing Pulses Prepulse Positive and negative 8 V approx pulses of 150 ns duration I f positive sync terminals are shorted negative pulse can be increased to approximately 50 V Sync pulse source impedance positive approx 300 D negative approx 1 kD Delay Sync Pulse Consists of a negative going transition of approximately 5 V and 100 ...

Page 5: ...ination pulse timing and output circuit that establishes the duration and amplitude of the main pulse 3 A power supply that provides regulated voltage for the other two circuit groups The repetition frequency duration and amplitude of the main output pulse are adjustable by front panel controls The instrument which is housed in a convert ible bench cabinet may be used a s supplied a s a bench inst...

Page 6: ...OUTPUT PULSE For negative main output OUTPUT PULSE Jack top binding For positive main output AMPLITUDE Inner Control Continuous Adjusts amplitude rotary control continuously between switch positions Outer Switch 10 position Sets pulse amplitude rotary switch in ten steps from zero t o maximum EXT OFFSET Jack top binding For connection to an post pair external power supply 10 SYNC DELAYED Jack top ...

Page 7: ...I N T R O D U C T I O N Figure 1 1 Type 1398 A Pulse Generator Figure 1 2 Type 1217 P2 Single Pulse Trigger ...

Page 8: ... T Y P E 1398 A P U L S E G E N E R A T O R RUBBER FOOT W l N G SCREW LOCKWASHER WlNG Figure 2 1 Rack Mounting Preparation of instrument for attachment of wings Figure 2 2 Rack Mounting Wing assembly ...

Page 9: ...res from ter minal 2L which is on the same panel a s the line volt age switch and connect them t o terminal 2 For instru ments changed to 215 volt or 230 volt operation name plates Type LAP166E5 for 215 volt operation Type LAP166E2 for 230 volt operation may be ordered from General Radio 2 3 RACK MOUNTING The pulse generator can be rack mounted by means of a Type 480 P312 Relay Rack Adaptor Panel ...

Page 10: ...e main pulse available at the DELAYED SYNC binding posts internal operation The mode where pulse repetition frequency is determined by the pulse generator itself and controlled by the PRF controls on the front panel external operation The mode where pulse repetition frequency is determined by an external signal source the pulse generator generates pulses only when triggered by signals applied to t...

Page 11: ...ding post is firmly connected t o both posts e Adjust the oscilloscope trigger controls to trigger on the volt 100 ns positive prepulse of theType 1398 A f Set the oscilloscope sweep rate controls for a 2 ms div sweep rate g Set the oscilloscope vertical gain controls for about 40 volts cm sensitivity h Set the P R F switch to 1kc s i Set the AF control fully clockwise j Set the PULSE DURATION dia...

Page 12: ...pe 1398 A output pulse simultaneously on the oscillo scope h Adjust the AF control and observe the starting point of the pulse Note that the AF control adjusts the phase at which the pulse i s formed and that the pulse always starts during the negative going input T o observe external operation on an oscilloscope transition proceed a s follows a Set up the equipment to display a 1 kc square wave a...

Page 13: ... 600 US can be obtained TABLE 3 2 50 OF PERIOD FIGURES I 50 of Period Durations inaccurate P R Con r01 m DORATON controi s e t t i g s I AFcontrol fully clockwise longer than those listed 3 4 4 DURATION EQUAL TO PERIOD When the DURATION controls call for a pulse exactly equal to the pulse period the instrument fails completely and both duration and prf are indeterminate 3 4 5 DURATION GREATER THAN...

Page 14: ...ort pulses or of refer paragraph 3 77 the rapidly changing voltage of the leading or trailing edge of such a pulse requires wide bandwidth amplifier 3 7 EXTERNAL LOAD CONSIDERATIONS and indicator systems For example when a pulse with The output circuits of the pulse generator are a s a rise time of 0 05 p s is displayed on an oscilloscope stable a s possible for an instrument of such simplicity wh...

Page 15: ...impedances high the desired result may be ob tained simply by addition of an external coupling ca pacitor large enough to prevent ramp off for the desired pulse duration If the above conditions do not hold or if it i s necessary to introduce dc offset an external power supply can be connected to the OFFSET ter minal Such a connection will allow the dc component level to be shifted by a s much a s ...

Page 16: ...ulse 1 By rotating the A F control with the P R F switch s e t t o EXT DRIVE 2 By touching the EXT DRIVE binding post 3 By using the Type 1217 P2Single Pulse Trigger The following three paragraphs explain each method in detail 3 1 1 2 ROTATION OF AF CONTROL Set the P R F switch to EXT DRIVE and rotate the AF control about 20 or 30 degrees clockwise from its center position and then reverse the dir...

Page 17: ...ut circuits of the second Type 1398 A to paralleled is 1000 n ohms and the peak voltage is still prepare it for the next delayed pulse Figure 3 8 shows 60volts A complexwaveform and the system to produce connections and timing waveforms of such a system it are shown in Figure 3 9 TYPE 1210 C UNIT TYPE 1398 0 TYPE 1398 A R C OSCILLATOR PULSE GENERATOR l PULSE G NERATOR 2 TYPE 1210 C TYPE 1398 8 I P...

Page 18: ...TPUT PULSE binding posts A detailed analysis of each circuit is contained in the following paragraphs 4 2 INPUT AND PRF OSCILLATOR CIRCUIT EXTERNAL OPERATION 4 2 1 GENERAL Let us first consider the circuit a s an aperiodic input circuit i e with the PRF switch set to EXT DRIVE a s shown in Figure 4 2 In this mode the cir cuit converts an external signal applied to the EXT DRIVE binding posts to a ...

Page 19: ...hen V102A i s turned on by a positive voltage applied to its grid The pre pulse is therefore produced when a negative transition occurs at the grid of VlOlA 4 2 3 QUIESCENT CONDITIONS In the absence of an input signal the grid of VlOlA will be at ground potential and its plate voltage will be around 6 0 volts Whether or not V102A will be on will depend upon the setting of R103 the A F and trigger ...

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Page 21: ...QlOl were on conducting current would flow through R154 and the voltage drop across R154 and R156 V105 bias would be sufficiently large to turn off V105 SinceVlOS is on QlOl must be off When QlOl is off 4102 i s on because the two transistors form a bistable multivibrator With 4102 on current flows through R157 to bias VlO6 off the quiescent condition described above in para graph 4 4 5 1 STOP I S...

Page 22: ...acitor C begins to charge to I50 volts As it charges it draws current through the plate load resistor R of V103A The duration is actually controlled by a sweep and thus keeps the plate of V103A from returning im generator whose sweep rate can be adjusted by the mediately to I50 volts DURATION controls Before the arrival of a start pulse all circuits are in their quiescent states V105 is on and sin...

Page 23: ... any attempt by V503 s grid voltage to change with respect to its cathodevoltage results in a compensating change in the voltage drop across V501 The drop across R 513 and to the top of R512 is therefore held very constant and is near 80 volts 4 5 3 THE POSITIVE VOLTAGE SUPPLY The constant 150 volt source established with V501J3 V503 and V504 is used a s a reference for the positive supply The pla...

Page 24: ...lowing service instructions please write or phone our Service Department s e e rear cover giving full information of the trouble and of steps taken to remedy it Be sure to mention the serial and type number of the instrument for service please write to our Service Department or nearest sales engineering office requesting a Returned Material Tag Use of this tag will ensure proper han dling and iden...

Page 25: ...with respect to ground If this is not within 5 of 66 volts regardless of the output load replace V504 Measure the resistances to ground from pin 2 pin 3 pin 5 and pin 6 of V501 and compare the results with the values in Table 5 1 Replace any defective resistors or capacitors thus found No output supply voltage Check V501 Measure the regulator input voltage across C501 and C502 If either of these v...

Page 26: ...range All heater voltages 6 2 volts ac Power supply disconnected terminals I17 and I18 near AMPLITUDE control grounded all transistors removed TEST CONDITIONS This table lists important voltages and resistances in the Type 1398 A These voltages measured by a Type 1806 A Electronic Voltmeter input resis tances 100MQ are accurate to within 25 R505 and R512 were set for normal power supply output 150...

Page 27: ...se given in Table5 1 5 5 6 INCORRECT FREQUENCIES If the frequency error occurs a t only one setting of the P R F switch the fault is one of the timing capa citors C108 through C117 Replace the appropriate capacitor If a l l frequencies are in error by about the same amount with the OF control fully clockwise check R102 R104 R105 and R108 5 5 7 FAILS TO SYNC ON EXTERNAL SIGNAL If the instrument ope...

Page 28: ... ACCURACY Setup Connect the OUTPUT PULSE coaxial connectors to the oscilloscope via a terminated 50 ohm coaxial patch cord Set the Type 1 3 9 8 4 controls a s follows A F HIGH fully clockwise PULSE DURATION dial 1 PULSE DURATION RANGE O 1 to 1ps AMPLITUDE lo fully clockwise P R F switch accuracy Check or adjust the pulse repetition frequency a s outlined in Table 5 2 Note that frequency is measure...

Page 29: ...e PRF 1 2 MC PULSE DURATION dial 5 PULSE DURATION RANGE O 1 to 1ps AMPLITUDE 10 fully clockwise Amplitude Equal to or greater than 3volts p to p Rise time 5ns or faster a s measured between the 10 and 90 points Be sure any rise time limitations of the oscilloscope are taken into account refer to para graph 3 5 3 for further rise time details 90 FALLTIME I H D L C 5 3 PULSE DURATION RANGE ACCURACY ...

Page 30: ...olts peak to peak Duration Equal to or less than 0 3 ps DELAYING SWEEP INTENSIFIED BY 5 8 6 EXTERNAL DRIVE PRF jitter Less than or equal t o 0 04 Set the Type 1398 A controls a s follows L F HIGH fully clockwise P R F 100 c s PUISE DURATION dial 1 PULSE DURATION RANGE 0 1 to 1 ps Setup Connect a sine wave generator to the EXT DRIVE binding posts Set the generator for an output of l0kc s 0 1V rms S...

Page 31: ...AINTENANCE Rlla C 1 1 5 C116 R125 C120 C123 F i g u r e 5 3 Top interior view F 1 0 2 F l O l C 503 r 8 R 5 0 5 R512 v1b7 ETCHED CIRCUIT ASSEMBLY Figure 5 4 Bottom interior view ...

Page 32: ...21 112 W Composition 1 k 0 5 1 2 W Composition 1 kD 25 1 2 W Composition 22 kD 25 1 2 W PART NO REF NO DESCRIPTION RESISTORS cont Composition 3 kD 25 1W Film 100 kO fl 1 4 W Composition 3 3 kc1 25 1W Film 51 1 k 0 21 1 4 W Film 150 k 0 21 1 4 W Composition 330 D f5 112 W Composition 56 k D 25 112 W Film 270 k 0 21 114 W Film 2 74 M62 1 2 W Composition 56 W 25 112 W Composition 1kW 25 1 2 W Composi...

Page 33: ...254 CR508 PART NO REF NO DESCRIPTION PART NO F501 F502 FClOl FC102 FC103 JlOl J102 J103 5104 Jl05 J106 J107 Jl08 PO9 JllO J l l l J l l 2 J113 J114 M501 P501 PL501 QlOl through 4104 SlOl S102 MISCELLANEOUS cont FUSE 215 V 0 5 A Slo Blo 5330 1000 FUSE 115 V 1A Slo Blo 5330 1400 FERRITE CORE 5000 1250 FERRITE CORE 5000 1255 FERRITE CORE 5000 1255 BINDING POST EXT DRIVE 4060 0100 BINDING POST EXT DRI...

Page 34: ...Figure 5 6 Power Supply etched board layout P N 1389 2750 NOTE The number on the foil side is not the part number for the complete assembly ...

Page 35: ...gits refer to the contact Contact 01 is the first position clockwise from a strut screw usually the screw above the locating key and the other contacts are numbered sequentially 02 03 04 etc proceeding clockwise around the section A suffix F or R indicates that the contact is on the front or rear of the section respectively PULSE DURATION R A N G E 2 I IOOJ 1 SEC NSUL ATED DUMMY TFRMINAL AMPLITUDE...

Page 36: ...DRIVE BOTKIM VIEW OIOI THRUP I 0 4 A T J S BR f 150V REG A TN7 GN W 158V REG CIO75 dd2141 MV WH GFRD 4 SOV EG 9 AT ANCHOR TERMINAL m VALUE MAYwSELECTED BY L a 8 REG 4 7 N 8 LOW ICALIBRATEDI Figure 5 7 Schematic Diagram of the Type 1398 A Pulse Generator ...

Page 37: ...ICE NOTES IN INSTRUC 0 TlON BOOK FOR VOLTAGES 8 SCREWDRIVER CONTROL APPEARING ON DIAGRAM 9 AT ANCHOR TERMINAL 4 RESISTORS 112 WATT 10 TP TEST POINT WH YE BK Wlf 150VREGISO5 1 I PL501 INPUT 105 25v OR 195 235v 4 r b 1 158 V REG A7 I7 50 6Oc 5 3 OFF POWER WH BR BK FOR 210 250 VOLTS REMOVE CONNECTION FROM A T PL AND CONNECT TO A K 2 158 V REG AT I 7 b I 7OVl A 141 V O V105 V106 V 5 0 3 Figure 5 8 Sch...

Page 38: ...RCOAXIAL 50 0 cable low loss 50 0 cable 20 50 cm adjustable stubs 90 ell 185 Mc s low pass fllter 500 Mc s low pass f l t e r 1000 Mc s low pass filter 2000 Mc s low pass filter 4000 Mc s low pass filter bias insertion unit 3 6 lo and 20 j attenuators adjustable attenuator rotary joint coupling capacitor lo 20 and 30 cm r i g d a i r lines 33 58 cm adjustable line constant Z adjustable lines radia...

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