Tektronix 7S12 Instruction Manual Download

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Summary of Contents for 7S12

Page 1: ...L MERCHANT PO 927792 SAN DI EGO CA 92192 7792 858 842 0785 FAX 858 642 0885 S B020000 up Serial Nu mber 7S12 TD R SA MPLE R Tek tronix Inc 0 Box 500 Beaverton Oregon 97005 0 Ph one 644 0161 Cables Te...

Page 2: ...ve in your area T h is procedure assure you th e fastest possible service Please inclu de the instrument Type or Part N umber and Serial or Mod el N umber with all req u ests for parts or service Spec...

Page 3: ...C NOV 1977 SECTION 5 PERFORMANCE CHECK ADJUST MENT Introduction 5 1 Equipment Required 5 1 Performance Check and Adjustment Record and Index 5 2 7512 Checks 5 3 S 6 S 52 and 7512 System Checks 5 5 S...

Page 4: ...Fig 1 1 7512 TDR Sampler unit...

Page 5: ...nd trip ment labeled PULSE G ENER ATO R accepts S series pulse time measurements of 0 to 10 s and one way d istance generators trigger recognizers or trigger count down h eads measurements up to 4900...

Page 6: ...ous coverage to at least 8 ps div Disp lay Modes SI N G LE Sweep E ach sweep is initiated by pushing and releasing the STA R T button REPetitiveSweep Normal resolution sweep rate is continu ously var...

Page 7: ...ge not more than 2 2 total of 4 after 2 5 ns from the step edge with the reference level at 0 3 s from the step edge Nominal 50 Time scale indicates round trip time Distance scales AIR and POLY dielec...

Page 8: ...scale Su pplemental I nformation Permits the cali bration of the POLY scale for dielectrics having velocity of propagation between those of poly ethylene and air Supplemental Information Nominal 50 Ti...

Page 9: ...13 383 in 5 464 in 4 988 in ENV I RONMEN TAL CHAR ACTER ISTICS Characteristic Performance Requirement Temperature Operating Non operating 0 C to 50 C 400C to 65 C Altitu de Operating Non operating Sh...

Page 10: ...NOTES...

Page 11: ...ration Then J 641 fixed shoe connector provides strobe connection to the 7511 Three meth ods of installation are sh own in F ig 2 1 CO NTRO LS AND CONNECTORS Part s hows the 7512 installed i n th e ce...

Page 12: ...Operating Instructions 7512 2 2 Fig 2 1 7S12 Installation Information...

Page 13: ...input signal zero refer V co n trol ence related to the CRT is the DC offset voltage instead of Units Div Selects calibrated deflection fac ground Th is control permits all tors from 500 units d iv t...

Page 14: ...witches provide 15 d ifferent cali b rated DIV setti ngs from 20 ps d iv to 1 s div in 1 2 5 sequence VAR IAB LE CAL P rovides continuously variab le IN Control uncalib rated time d iv by reducing the...

Page 15: ...ds installed in mV pushed in the Pulse Generator compartment mV Div 100 for DC stabilized samp ler applica DC OFFSET F I NE Midrange tions N ormal This is the normal operating switch center position p...

Page 16: ...connectors 10 Observe the S 52 waveform shown in F ig 2 3A The positive p ulse in the center of th e screen is used in the S 52 to automatically reset the tunnel d iode bias for the next pulser trigg...

Page 17: ...is caused from the short circuit termination This reflection therefore has voltage reflection coefficient of about 1 or 1000 mp 15 R emove the short circu it termination Change the DC O FFSET control...

Page 18: ...ting for the amplitude of th e reflection Note that the graticule center is used as the 50 reference line In add ition to impedance values the overlays include POLY distance scale in cm using the 100...

Page 19: ...tion on th e C RT screen note the due to th e 7512 pulser trigger delay and the S 52 short horizontal calibration DI V and use Table 2 1 to pulse Using the Multiplier of 10 with pulse generator determ...

Page 20: ...inuity to mined by the setting of the PRESET control screwd river the same reference point on the C RT R ecord the TIME adjustment on the front panel w hen the PRESET button is DISTAN CE setting Subtr...

Page 21: ...e 5 and 2 positions of the units Div switch H igh resolution separate pushbutton switch on the front panel can be selec ted whenever smooth ing of the display is required Th e disp layed noise is red...

Page 22: ...1 tte t is 0 j r 1 Or 0 VS uV U IS decf Fig 2 12 Hig h Fre que ncy Sig nal A pplicatio n swee p will progress across t he screen an d sto p on the rig ht si d e r ead y for anot her o peration PRES E...

Page 23: ...nt reference li ne and then fully engage such as 7511 with an appropriate sampling head can be the connector See F ig 2 9 wh ich illustrates th is d is used installed in the left vertical compartment...

Page 24: ...Op e r ati n g Instru ctions 7S12 f n cessar us 10 tte m t r V f111 39 1 s e ud t h S 53 5 2 t r 1 cahle 17 i 1s ec t 111y F w c F 9it R i Fig 2 13 General Purp ose sampling...

Page 25: ...s from th e Avalanche and Snap Off circuits These circu its are controlled by drive pulses from the 7512 When the sampling bridge d iodes conduct sample input signal is taken If the input signal ampli...

Page 26: ...Circu it Description 7512 z_ J 0 1 _ 0 2 c H r J_ j i _ _j IL i _ 00 LU 0 0 CC 7 _ _j W CL _ 0 cc CC CD CC LL __ _ __ _ _ I z 7 d1 7 20 t...

Page 27: ...tage changes su perimposed on relatively large DC levels Ramp Inverter Hold off Ramp F ig 3 2 Pulser Baseline Correctio n circu it block diagram Circuit Description 7512 Since the reference pu lse amp...

Page 28: ...igger Holdoff times has elapsed the Memory The Correctio n Memory signal is applied to the retrigger pulse causes the Trigger Circuit to start the rundown of the F ast R amp circuit Setting the Multip...

Page 29: ...LD OF _ I F 10 AS l s 1 s lo gs 1 is 1 As 7 AST 1 As 1 As OAS 5 s lops 15 s 20 s Pretrigger I Volts from S 52 Display Center t Fast 0 V Ramp 5 V PULSE COMPARATOR PU LSE TIME 10 10 As DRIVER DISTANCE...

Page 30: ...Circuit Descri ption 7512 3 6 F ig 3 5 Block diagram of Slow Ramp and associated circuits REV A PR 1974...

Page 31: ...ternal Driver applied to the input of the Scan Amplifier is utilized Scan Amplifier The Scan Amplifier serves as constant current source for the integrati ng circu it that produ ces the slow ramp Maxi...

Page 32: ...t Ramp See Fig at the sweep start left edge of the CRT graticule If the 3 7 With the DI V control set to the slowest rate Slow R amp Generator output is 10 volts at the time of available at the select...

Page 33: ...isp lay 11 0 V Wind ow Circ uit Description 7S12 1 l 1 2 s 4 5 V Slow 9 e Ram p 6 V I n verter Positio nin g Ra nge DIV at 20 ns d 5 Mag I D DIV at 20 ns d iv 5 Mag fully TIME DISTANCE fu lly CW Co n...

Page 34: ...the entire interval from pretrigger u ntil 2 s later is d isplayed across the CRT The p ortion of the d isplay between the 5th and 6th horizontal division on the CRT graticule 1 s to 1 2 s after p re...

Page 35: ...inals The DC Offset Circuit is single transistor emitter follower that converts the fairly h igh resista nce of the DC OFF SET control to fairly low resistance at th e emitter of Q163 Q163 emitter vol...

Page 36: ...C Amp lifier output transistors are removed from their sockets CR 201 conducts sign al drives both sides of the memory gate diodes if Q208 is removed and CR206 conducts if Q204 is removed Parasitic su...

Page 37: ...g tailed differential amplifier provid ing h igh gain With no signal c Since th e AC Amplifier output signal is applied to the applied to the gate of Q242A the current through each Memory amplifier vi...

Page 38: ...gh Q382 is about 1 mA positive than about 12 volts CR274 conducts reducing wh ich is insufficient to forward bias Q386 Diode C R 385 the amplifier gain to much less than 1 If the output tries to h old...

Page 39: ...negative trigger signals are applied to the C387 or C390 timing unit through the oscilloscope interface Signal amplitude at th e trigger output is about one h alf of that at the output of the Vertica...

Page 40: ...Q418 to shut off With 0418 off no column current can flow duri ng time slot 9 If the probe is switched to IDENTIFY current a nd no symbols will be displayed during th is period The through Q416 is ab...

Page 41: ...Fast R am p to complete its run When the positive pulse ends the Fast R amp is reset to zero to await th e next trigger pu lse Prior to th e arrival of the trigger pulse from the S series head time 1...

Page 42: ...timing current and timing capacitance Transistor Q516 emitter current flows through R 514 Prior to arrival of the input trigger and the turn on of Q510 wh ich follows the collector of Q510 is held at...

Page 43: ...trobe Generator The voltage divider consisting of R 560 R562 and R 564 provides about 5 volts for the base of Q566 and Q568 and approximately 10 volts for the base of Q552 Since the emitter of Q552 is...

Page 44: ...ve going spike at th e collector of supplies horizontal deflection voltage to the oscilloscope Q580 Th is output serves as drive sign al to the snap off C R T diode in th e pulse generator head Slow R...

Page 45: ...low R amp Generator output reaches about 11 volts the charge on capacitor C624 is approximately 10 volts Circuit Description 7512 Single Sweep Blanking Q634 and 0638 is turned on by U620D when the slo...

Page 46: ...to the minus input of the Correction circuit is enabled Switch S901 in the Off position forward Period Generator U910 The beginning edge fast rise biases Q903 to turn the Pulser Baseline Correction ci...

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