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Tektronix 545 Calibration And Maintenance

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  • Page 2 A N D M A I N T E N A N C E PROCEDURE Additional copies may be ordered through Tektronix, Inc. field offices and overseas representatives. Specify Stock N o. 070-282. Price $2.00, postpaid in the United States.
  • Page 3 Third Printing, May 1962 Changes: 5-62 Title Page (Reverse)..Change List ..Added 5-62 Abbreviations , ........Revised 5-62 3 - 1 ........Revi sed 5-62 3-1A ......Sec 3 Index ..Added 5-62 3“23.
  • Page 4 Calibration & Maintenance Procedure 070-282 Supplement May, 1962 The enclosed pages contain revisions and corrections to the Tektronix Type 5^5 Calibrat ion and Maintenance procedure Edition B. Remove and destroy old pages. You may already have revised page 3*30 (Rev 8-61) if so, you may throw away the copy enclosed.
  • Page 5 Third Printing, May 1962 Changes: 5-62 Added Title Page (Reverse)..Change List . 5-62 Abbreviations ......Revi sed 5-62 Revi sed 3 - 1 ........Added 5-62 3-1A ......Sec 3 Index . Revi sed 5-62 3-23........
  • Page 6 ABBREVIATIONS C.F. or cf Cathode-Follower Spec Speci f?cat ion Cathode-Ray Tube Trig Trigger Clockwi se V.A. or VA Vertical Amplifier Counterclockwi se Volts D.S. or Del 1g Swp Delaying Sweep D.A. or DA Distributed Amplifier External High Voltage 1 nt 1nternal Kilocycle (103 cycles) kilohm (10^ ohms)
  • Page 7 SECTION 3 CALIBRATION AND MAINTENANCE PROCEDURE GENERAL INSTRUCTIONS USING THE PROCEDURE: As far as possible, each step in this procedure is divided into three main parts: Measurement, Adjustment, and Trouble­ shooting. The calibrator needs only to proceed within the step far enough to secure specified performance, and may skip the remaining portions.
  • Page 8 SECTION 3 INDEX Starts On Page Physical Checkout..........3-2 Power Supply............3-3 Calibrator (Set)......3-1^ High Voltage Supplies......... 3-15 Miscellaneous Functions.......... 3“ 17 CRT, Focus and Intensity Circuits........ 3-18 Main Vertical Amplifier— Initial Alignment......3-22 Calibrator (Divider)........
  • Page 9 (6CB6's or 6DK6's) w ill require replacement. (Do not mix tube brands.) Use of 6DK6's is no longer recommended (SN 9292 - up). Replace with type 8136 (Tektronix p/n 154-367). See page 5-0. Now, turn P-Unit "o ff". Center the trace and check voltage at each suppressor grid in the distributed amplifier for +175 v .
  • Page 10 2 v max. Replace one or both tubes of each out- of-tolerance pair. For S/N 101—9291> use checked 6CB6's, Tektronix p/n 157-037. For S/N 9292-up, select "raw" Type 8l3$is but see* below. Log high and low bias values in Cal Record.
  • Page 11 7.2.2.3 D.A. Balancing; After selection of tubes (if necessary) for proper bias, recheck 7.2.2.1. If trace shift is still greater than 2 mm from CRT electrical center, tubes of a pair can be "swapped across" to achieve balance. If tubes are swapped between pairs, or if further tube replacements are required for balance, repeat 7.2.2.2.
  • Page 12 LINEARITY: Install Dual-Trace plug-in. Free run main sweep at 10 psec/cm. Position trace to top and bottom of visible scan. If necessary, remove graticule cover and use white nylon cam to adjust graticule so ruled portion is exactly centered in area of usable scan. 7.3.1 Compression (linearity) Measurement: Set vertical Volts/Cm to...
  • Page 13 D.C. SHIFT; 7.4.1 D.C. Shift Check: Use battery, or ohmmeter range of VOM to deflect free-running trace 4 cm. Watch trace closely for 5“ 10 seconds. If it drifts from its first stopping point,log amount and direction of drift in Cal Record under "Initial" (re-check measurement by noting drift during 5-10 seconds after removal of DC voltage).
  • Page 14 GAIN SET: 7.7.1 Maximum Gain: Install EP53A Gain Adj Adapter between plug-in and scope, or install TU-1 (or TU-2 set to 1:1) Test Load Unit. Apply 200 mv of calibrator signal to banana jack on EP53A or to TU-1 or TU-2 input. Turn Gain Adi control for main vertical amplifier (facing down on amplifier chassis) full clockwise.
  • Page 15 9.2.3. Trigger Sensitivity — continued; If a bright burst of sweeps occurs as the spot passes slowly over the triggering point, or if sweep is triggered on both upward and downward passes for either slope setting, Trigger Sensitivity setting is too high. Advance Stabl1i ty control until sweep just free runs with no ver­...
  • Page 16 ll.l.U Sweep Amplifier Check: With the Magni fier on and sweep positioned as in 11.1.3, rap sharply on the scope with your hand, watching for horizontal microphonics. Now, turn Magni f ier off and on at about 5 sec­ ond intervals, watching for slow drift after switching (DC Shift). Repeat with sweep positioned far to the left.
  • Page 17 11.2.6 Timing Problems; 11.2.6.1 Delaying Sweep Won't Time: Try replacing Vl90, VI80 and/ or VI50. Recheck -150 v supply for correct voltage. Max Sweep Length (11.1.6) is off, recheck Horizontal Gain (11.1.9). Try setting up basic timing on 2 msec/cm (timing component check).
  • Page 18 MULTIPLIER VARI - TIME/CM COMPONENT (S) TIME MARKERS CORRECT Setting Setti nq ABLE From 1 I 80A Being checked DISPLAY 100 psec 100 lisec 1 mark/cm C99C & D 100 psec 100 lisec 2 marks/cm R99E & F 100 psec R99D 500 lisec 1 mark/cm...
  • Page 19 13.2.2 5 psec/cm Range; (Continued) Log 1 cm and 9 cm dial readings for 10 psec/cm and 2 psec/cm sweeps. Difference between readings, as before, must be 8.00 ± 0.05, for each sweep rate. 13.2.3 Troubleshooting: 13.2.3.1 Excessive Timing Error: Examine Delaying Sweep display closely, and see if direct display error corresponds to error indicated by H elidial.
  • Page 20 15.6 TROUBLESHOOTING; Most common malfunctions and aberrations in the vertical amplifier circuitry will have been cleaned up by tube and component replace­ ments in Steps 7 and 15.1. Listed below are some of the unusual and in­ frequent failures causing effects only noticeable during fast-rise obser­ vations.
  • Page 21 6 BQ 7 A stocks as follows: able to you, maintain 8 ea "raw" 6BQ7A (Sylvania) and 2 ea, Tektronix, Inc. selected and aged 6BQ7A, 157-022 for use in horizontal output circuits (V265 & V272.) Tube stocks maintained at indicated levels should be adequate for 1-6 instruments.
  • Page 22 April 1959 .TYPE 545 Knobs __________________________________________________________ Old Type_________New Type ______________________________________________________ 101 thru 1051_______ 1052 & up ________________________________ Except*__________ Plus* Knob, red, white dot, for 1/8" shaft_________________________ 366-017_________ 366-038 Used; Trig.Mode; Length (Delaying Sweep);__5X Magnifier:______________________________ ______ Multiplier; Sq. Wave Calibrator._____________ C D _______________________________ Knob, red, white dot, for 3/16"...
  • Page 23 April 1959 TYPE 545 _____________ ______________ Switches__________________________ ____________ All changes made to Type 5 4 - 5 at SN 13,344 were made to RM45 at SN 306. ___________________________________ 101 thru 13,343 SWl & SW5 Trigger Slope & Mode__________________ 260-099 262-080 13,344 &...
  • Page 24 April 1959 TYPE Vacmra Tubes Cont, A H changes made to Type 545 at SlTl37344^ere made to RMU$ at SN Jut>. " " 12BY7 -Multivibrator 154-047 101 - 13,343 V73 A&B 6BQ7A Sweep-out C.F. & Gate-out C.F, 75W0Z8 USE 154-187 ~ 13.344 &...
  • Page 25 _ 154-051 7820 5642 -1350-v Rectifier 154-Q5ll +8650-V 7oltage Trioler 7821 5642 All changes made to Type 545 at SN 13,344 were made to RM45 at SN 306 154-051 7822 5642 +8650-V 7oltage Tripler 154-051 O-V 7oltage Tripler 5642 V823...
  • Page 26 A N D M A I N T E N A N C E PROCEDURE Additional copies may be ordered through Tektronix, Inc. field offices and overseas representatives. Specify Stock No. 070-282. Price $2.00, postpaid in the United States. ©Copyright 1961, Tektronix, Inc. Reproduction without written permission of copyright owner prohibited.
  • Page 27 Section 5 PARTS LIST: A list of all electrical parts and some mechanical parts used in a Tektronix Type 5^5 Oscilloscope. The list is arranged as a history file, showing the changes in component values brought about by modifications made during the extended production run...
  • Page 28 ABBREVIATIONS C.F. or cf microfarad farad) Cathode-Follower Cathode-Ray Tube mi cro-mi crofarad fa rad) Clockwi se psec microsecond second) Counterclockwlse Ohms ‘ g S. or Del Delaying Dweep External High Voltage 1 nt 1 nternal ■ a 10 J ohms) kilohm ( kilocycle cycles)
  • Page 29 USABILITY AND CONDITION CHECK Make visual check for overheated components; make sure tubes are firmly in sockets; check to see that CRT pin connections are tight. Install DC-coupled voltage-measurement plug-?n preamplifier (Type 53", 53/5*+" A, B, C, CA, D, G, H, K, L, M, or Z). Set plug-in controls as follows;...
  • Page 30 Circuits and functions checked: k .k Turn TIME/CM to 0.1 usec/cm. Sweep length should increase somewhat. Now, turn MAGNIFIER "On". With Sweep Amp. a slight advance of the INTENSITY control, the free- CRT Emission running sweep should be clearly visible without serious defocussing under average interior lighting conditions.
  • Page 31 Circuits and functions checked: i f . 10 Turn Delaying Sweep TIME/CM to 2.0 msec, and DELAY TIME 2 . 00 . Delay Pickoff MULTIPLIER to Adjust INTENSITY so a small brighten­ 2 cm from the start) is ed segment of the trace (about Trigger Gate Gen.
  • Page 32 SECTION 2 TEST EQUIPMENT REQUIREMENTS LIST TEST OSCILLOSCOPE REQUIREMENTS. GENERAL REQUIREMENTS: The test scope must be used for measurement of power-supply ripple, dual-trace switching characteristics, output waveforms, and for troubleshooting checks in the calibration procedure. The test scope should meet the followi ng minimum speci ficat ions: Triggered, calibrated, linear sweep, with or better accuracy.
  • Page 33 Less than 3 nsec (mpsec) Output: Variable, 0.1 to 0.1+v into 52ft. Rep Rate: Variable, 0.1+ to 1.0 me Tektronix Type 107 or equal. 3.1+ CONSTANT AMPLITUDE SINE-WAVE GENERATOR (Steps 9 and 15) Frequency Range: 50 kc to 50 me Output Voltage: 0.1+ to 10 v into 52ft...
  • Page 34 ACCESSORIES DESIRABLE BUT NOT REQUIRED: * 1 - 93ft cable, 42" long, with UHF connectors. (Tektronix 012-003) * 2 - 93ft terminating resistor assembly, Type B93R, Tektronix p/n 011-011. I - Input Capacitance Standardizer. Type CS-47. Tektronix p/n 011-021. *0ne supplied with Type 105.
  • Page 35 SECTION 3 CALIBRATION AND MAINTENANCE PROCEDURE GENERAL INSTRUCTIONS USING THE PROCEDURE: As far as possible, each step in this procedure is divided into three main parts: Measurement, Adjustment, and Trouble­ shooting. The calibrator needs only to proceed within the step far enough to secure specified performance, and may skip the remaining portions.
  • Page 36 PHYSICAL CHECKOUT. DAMAGE CHECK: Remove cabinet, examine instrument for evidence of damaged or overheated components. Check to see that CRT pin connections are tight, and all tubes are securely in their sockets. AIR FILTER; Check condition of air filter; note in Cal Record. If loaded with dust, wash in hot water and soap and dry, then coat lightly with RP "Filter Coat".
  • Page 37 POWER SUPPLY. RESISTANCE TO GROUND. LOW VOLTAGE SUPPLIES: Disconnect scope from power line; remove plug-in preamplifier; 2.1.1 Resistance Measurement; Locate power supply busses at rear of sweep chassis (supplies identified on chassis lip) or on the bottom of the power supply chassi s , adjacent to the 10-0hm metering resistors.
  • Page 38 RELAYS: Install Oual-Trace Plug-1n (or Type TU-2) and preset front panel controls as follows: Setting Control Intensi ty Hai n Sweep Stabi1i ty CCW (but not into "preset") "AC Slow" Triggering Mode 1 msec Main Sweep Time/Cm Multiplier " " Hagni fier "Off"...
  • Page 39 LOW VOLTAGE REGULATED SUPPLIES: 2.3.1 Measurements: CAUTION: Before making the measurements listed below, verify that your 117~volt 60-cycle AC power line is delivering a reasonably good sine-wave. Regulated power supplies— as used in the Type 5^5 scope— depend for successful operation upon the 60- cycle input 1ine voltage reachi ng a certain peak volt- age each cycle.
  • Page 40 2.3.1.4 Input to Regulators: Return line voltage to 117 and log DC voltages at input to regulator ci rcuits (pin 9 of 12B4's, pins 2 & 5 of 6080's). 2.3.1.5 Current: Measure voltage drop across 10-ohm metering resistors, convert to current (divide by 10 or 5) and log.
  • Page 41 2.3.2 Ad j ustments: 2.3.2.1 -150 Ad j: If -150 v supply does not fall within tolerance, locate internal 150 Ad j1 1 control, on a bracket at the rear of the power supply chassis. Adjust this control to bring -150 v supply within tolerance. Note on Cal Record if this adjustment is made, and enter new voltage readings for each supply.
  • Page 42 2.3.3 Troubleshooting: Remember that each positive regulated supply depends on the supplies "below" it for reference voltages and/ or current. See schematic diagram for "stacking" of supplies. Always start troubleshooting with the — 150 v supply and work upward. The +100 v supply depends for more than ha If of its total load current on the proper operation of the +350 supply and the vertical amplifier (distributed amplfier cathodes re­...
  • Page 43 2.3.3.2 Ripple Problems: NOTE: Several millivolts of the calibrator waveform normally show on the +100 v supply while the calibrator is operating. Turn calibrator off while measuring ripple. Sweep circuit waveforms will also show up on all supplies if either sweep is operating. Un­...
  • Page 44 11 be billed (invoiced) at current net price unless original transformer is actual 1y defective. Defective transformer must be returned to Tektronix, Inc., for credit. 3-10 CALIBRATION AND MAINTENANCE PROCEDURE...
  • Page 45 2.3.3.5 Supply Overload Indications: Metering resistors damaged. Measure. Actual overlaod. Recheck resistance to ground (2.1.1). Isolate overload by using decoupling and plate resistor drops to com­ pute currents. Insert metering resistors in distribution busses if necessary. severe overloads, see 2.3.3.6. 2.3.3.6 Severe Overloads, Fuse-Blowing, etc.: Operate scope at 1/2 to 1/3 normal...
  • Page 46 Set line voltage to scope under test to 117. After checking differentia! balance and calibration of test scope at 100 v/cm (with Type G, a pair of balanced probes will be necessary), measure the peak-to- peak voltage differential between terminals 1 and 4 on the power transformer of the scope under test.
  • Page 47 2.4.1 Measurements: Measure the DC potential at each of the elevated filament lines. Most convenient measurement point is at the transformer. measurements in Cal Record. Transformer terminals 22/23 27/28 9/16 24/25 Elevated to (v dc) +100 +225 +350 -1350 2.4.2 T roubleshoot i n q : 2.4.2.1 No DC "Elevation11;...
  • Page 48 CALIBRATOR. MEASUREMENTS: 3.1.1 DC. Reference; Turn Calibrator "Off". With precision DC meter, measure voltage to ground from "Cal Test Point"*. This should be 100 v ±1%. Log voltage if within tolerance. 3.1.2 Symmetry: Turn Calibrator to "Volts" or "Millivolts" range. Test-point reading on DC meter should be 45-55 volts (45-55% duty cycle &...
  • Page 49 HIGH VOLTAGE SUPPLIES. MEASUREMENTS: 4.1.1 HV Test Point: (Cathode Supply): Locate HV test point on F £ • I chassis above CRT shield on left-hand side. Measure between this point and ground (-1350 v ±3%).* Log in Cal Record if within tolerance.
  • Page 50 Get in touch with your nearest Tektronix Field Office or Overseas Representative. -TUBE REPLACEMENT NOTE: Always check for leakage or overload if Type 5642 tubes requi re replacement. Under normal condi tions, these tubes do not requi re frequent replacement.
  • Page 51 MISCELLANEOUS FUNCTIONS. BEAM POSITION INDICATORS: 5.1.1 Operation Check: Make sure sweep generators are not running. Bring up Intensity until spot is just visible on screen (refocus if necessary). Turn Magni fi er on, and use position controls to position spot offscreen to the right, left*top, and bottom. that the appropriate indicator lights are turned on (glowing) as the spot leaves the graticule area.
  • Page 52 & CRT F I CIRCUITS. CRT ALIGNMENT: 6.1.1 Check; Free-run Main Sweep and position unmodulated trace to center graticule line. Check for tilt of trace. See that CRT is positioned up tight against graticule, for minimum parallax. Note on Cal Record. 6.1.2 Adjustment;...
  • Page 53 CRT CONDITION: 6.2.1 Checkout; 6.2.1.1 Gas: At several sweep rates, check for smooth increase in free-running trace intensity as Intensity control advanced slowly. Two peaks of intensity probably indicate gas in CRT. 6.2.1.2 Cathode Damage (Interface): At slow sweep rates (10 msec/cm to 100 |asec/cm) compare start of trace (at left) with the rest of the trace.
  • Page 54 GEOMETRY: 6.3.1 Geometry Check: Patch from Vert Siq Out to Trigger or Ext Sweep In connector. Turn Horizontal Display to "Delaying Sweep", turn Main Sweep Stabi1?ty CCW (not into "preset") and Triggering Mode to any position except Automatic. Obtain triggered, Delaying-Sweep display of calibrator waveform at 2 msec/cm.
  • Page 55 IF NEW CRT IS INSTALLED; 6.4.1 Operation Check: 6.4.1.1 Repeat Steps 6.1 (Alignment) and 6.2 (Condition). 6.4.1.2 Reset Geometry (6.3). 6.4.1.3 Check and Log Vertical Deflection Factor: With no vertical signal input, position trace or spot to the top graticule line.
  • Page 56 Cal Record. If any appreciable slope is visible, replace input amplifier tubes *and repeat 7.1. *For 5^5's S/N 101-9291, use checked 6AW8's, Tektronix, Inc. P/N 157-039. serial numbers 9292-up, use checked 12BY7A's, Tektronix, Inc. P/N 157-053. Always replace both tubes at the same time, and always use two tubes with the same subgroup number (between 1.0 and 2.0) stamped on the label.
  • Page 57 7 .1 .3 Cathode Interface Check: Install Type (53/54) P Pluq-in and pre-set front-panel controls as follows:---------- Stability Horizontal Display Main Swp Norm. Triggerable Triggering Level Trigger Slope +lnt Time/Cm . 1 psec Triggering Mode AC Fast M ultiplier Coil Current Magnifier O ff Amplitude...
  • Page 58 2 v max. Replace one or both tubes of each out- of-tolerance pair. For S/N 101-9291, use check 6CB6's, Tektronix p/n 157-037. For S/N 9292-up, select "raw" 6DK61s , but see* below. Log high and low bias values in Cal Record.
  • Page 59 7.2.2.3 D.A. Balancing: After selection of tubes (if necessary) for proper bias, recheck 7.2.2,1. If trace shift is still greater than 2 mm from CRT electrical center, tubes of a pair can be "swapped across" to achieve balance. If tubes are swapped between pairs, or if further tube replacements are required for balance, repeat 7.2.2.2.
  • Page 60 LINEARITY: Install Dual-Trace plug-in. Free run main sweep at 10 psec/cm. Position trace to top and bottom of visible scan. If necessary, remove graticule cover and use white nylon cam to adjust graticule so ruled portion is exactly centered in area of usable scan. 7.3.1 Compression (linearity) Measurement: Set vertical Volts/Cm to...
  • Page 61 D.C. SHIFT; 7.4.1 D.C. Shift Check; Use battery, or ohmmeter range of VOM to deflect free-running trace 4 cm. Watch trace closely for 5-10 seconds. If it drifts from its first stopping point,log amount and direction of drift in Cal Record under "Initial" (re-check measurement by not i ng drift duri ng 5~10 seconds after remova1 of DC voltage).
  • Page 62 DRIFT WITH LINE VOLTAGE CHANGE: 7.5.1 Drift Measurement: Install Type P or Type TU-1 or TU-2 plug-in 117 v. and center free-running trace with no input signal, and line at Reduce line voltage to 105 v and watch for slow drift of trace due to filament voltage change.
  • Page 63 VERTICAL SIGNAL OUTPUT & TRIGGER P1CKOFF. 7.6.1 Amplitude and Waveform Check: Obtain 2 cm calibrator waveform display on scope under test. With test scope, measure output at Vert Sig Out connector on front panel. This should be 3 volts minimum, ±1.5 v from ground potential (AC-coupled circuit).
  • Page 64 GAIN SET: 7.7.1 Maximum Gain: Install EP53A Gain Adj Adapter between plug-in and scope, or install TU-1 (or TU-2 set to 1:1) Test Load Unit. Apply 200 mv of calibrator signal to banana jack on EP53A or to TU-1 or TU-2 input. Turn Gain Adi control for main vertical amplifier (facing down on amplifier chassis) full clockwise.
  • Page 65 CALIBRATOR DIVIDER. ACCURACY CHECK: Remove EP53A Gai n Ad j Adapter (if used) and install Dual-Trace (C or CA) plug-in. (For greatest accuracy, use Type Z. Procedure below is for dual-trace unit only, however.) Present controls as foilows: Volts/Cm: Ma i n Sweep Horizontal Display: 10 psec/cm Vari able:...
  • Page 66 8.3.2 Erratic Output: Try tightening the mounting nut on the calibrator switch; recheck for ground-return or contact resistance as switch is operated. Replace V246. Check for intermittency in Cal Adj control. Check 1/4 ohm resi stor R Repeat Step 3 after tube replacement or circuit repairs;...
  • Page 67 TRIGGER CIRCUITS,, MAIN SWEEP. PRELIMINARY CHECKOUT: Install Type (53/5*+) K or L plug-in. Set front-panel controls as follows: Cont rol Sett inq Sett i nq Control Multiplier (Red) Clockwi se Stabi1ity Free-run (CW) Triggering Mode Clockwise Triggering Level Triggering Slope + 1 nt T i me/Cm 1 msec/cm...
  • Page 68 REALIGNMENT: Preset front-panel controls as follows: Control Setting Stability "Triggerab)e" (5° CCW from free-run) Triggering Level "0" Time/Cm 1 msec/cm Magnifier Multiplier (Black) Triggering Mode Trigger Slope +Ext Horizontal Display Main Sweep Normal 9.2.1 Triggering Level Knob Zero: Locate the junction of **70 k resistors R16 and R17 on the left side of the Trigger Slope switch.
  • Page 69 3 . ^ T r i g g e r ° ° c o n t i n u e d ; b u r s t o f 9.2o Sensitivity bright sweeps occurs as the spot passes s l o w l y o v e r t r i g g e r i n g p o i n t , o r upward if sweep is triggered on both...
  • Page 70 internal, 60 cps sinewave display: AC Slow, DC; 5 mm signal, switchable with Triggering Level at 0. CAUTION: It is not desirable to obtain triggering sensitivity in excess of specifications. Normal tube aging increases sensitivity of the shaper multi­ vibrator (V20) and will cause erratic triggering on small noise components, particularly when the instru­...
  • Page 71 TROUBLESHOOTING THE TRIGGER CIRCUITS: 9.5.1 Erratic Triggering on Small Signals; Check for excessive noise in internal trigger pickoff system (See 7.6). Triggering will normally become erratic, in Automatic mode, on signals below 1/2 mm in amplitude. Be sure erratic triggering is not due to RF pickup in unshielded patch lead.
  • Page 72 TROUBLESHOOTING ASSOCIATED CIRCUITS: Some triggering problems may be due to defects outside the trigger circuits themselves. In addition to steps below, also see troubleshooting tips for Steps H and 12. 9.6.1 Stability Control Has No Effect; Make sure Horizontal Display switch is functioning normally and is set to Main Sweep Normal.
  • Page 73 TRIGGER CIRCUITS. DELAYING SWEEP. 10.1 PRELIMINARY CHECKOUT: 10.1.1 D. C. Balance: Turn both sweep generators off. Turn Horizontal Display Switch to "Ext Sweep" and turn Magnifier on. Center beam with position controls, using beam-position indicator lights. Then bring up Intensity slowly until spot is visible.
  • Page 74 10.2 REALIGNMENT: (Remove patch from Vert Sig Out to Trig In .) 10.2.1 V I 13 Gas Check: With controls as in 10.1.2, use test scope to measure voltage at the center (wiper) terminal of the Triggering Level pot (the section nearest the front panel).
  • Page 75 10.3 FINAL CHECKOUT: Set up front panel controls as in 10.1.2, except set Atten toggle switch to X 10. Patch 60-cycle waveform to vertical input and Vert Sig Out to Trig or Ext Swp In. Log minimum display amplitude (mm) allowing slope-switching without resetting of Triggering Level pot, and absolute minimum display amplitude, disregarding "switchability".
  • Page 76 SWEEP CALIBRATION. of the sweep calibration that follow, maximum NOTES: In all steps accuracy and utility oscilloscope will be preserved by ©f the making all direct-display timing measurements over the middle eight centimeters of the graticule. Adjustable timing ranges then may be set to within 1/2% over this portion the grati­...
  • Page 77 SWEEP CALIBRATION. Log type and serial number of Time-Mark generator in Ca1i brat i on Record. 11.1 FIRST CHECKS AND ADJUSTMENTS: Turn off Main Sweep and turn Horizontal Pi splay switch to Delaying Sweep. Set Delaying Sweep controls as follows: Time/Cm 500 psec/cm Length...
  • Page 78 Sweep Amplifier Check: With the Magni fier on and sweep positioned as in 11.1.3* rap sharply on the scope with your hand, watching for horizontal microphonics. Now, turn Hagni fier off and on at about 5 sec­ ond intervals, watching for slow drift after switching (DC Shift), Repeat with sweep positioned far to the left.
  • Page 79 11.2 PRELIMINARY TROUBLESHOOTING: assumed in the steps below that Calsbrati Steps 1 through 10 have been completed far as possible, and that Power Supply, CRT and other circuits are functioning normally. Recheck earlier steps if in doubt. 11.2.1 No Sweep: 11.2.1.1 No Main or Delaying Sweep;...
  • Page 80 V265 and V272 should always be replaced at the same time. Use Type ECC88/6DJ8 or E88CC/6922 if possi ble. If not, use aged and selected 6BQ7's,, Tektronix p/n 157-022. Repeat 11»1 after any tube replacement. If V265 and V272 are replaced, check linearity of mag­...
  • Page 81 11.2.6 Timing Problems: 11.2.6.1 Delaying Sweep Won't Time: Try replacing VI90, VI80 and/ or V150. Recheck -150 v supply for correct voltage. Max Sweep Length (11.1.6) is off, recheck Horizontal Gain (11.1.8). Try setting up basic timing on 2 msec/cm (timing component check).
  • Page 82 Thi s is normal if confined to the 1ast cm or so of the sweep. A circuit modification is available if the problem is serious in your application (contact your Tektronix field engineer). 11.3 SLOW SWEEPS. MAIN SWEEP 11.3.1...
  • Page 83 TIME/CM MULTIPLIER VARI­ TIME MARKERS CORRECT COMPONENT"!?! Sett i nq Setti nq ABLE From 180A DISPLAY Being checked 100 psec 100 M.sec 1 mark/cm C99C & D 100 psec 100 lasec 2 marks/cm R99E & 100 psec 500 (isec 1 mark/cm R99D 100 psec 2.5-1...
  • Page 84 1 1 . 4 FAST SWEEPS. MAIN SWEEP: L |j Second half of sweep First half of sweep i s timed fi rst wi th is then timed with Horiz. timing capacitor Amplifier compensation. C99("). Showing method of timing fast sweeps Fig 11-3.
  • Page 85 (Use Type 1 1 . 4 FAST SWEEPS. MAIN SWEEP; ( 5 3 / 5 * 0 P l u g - i n ) 11.4.1 Measurements: Set up front-panel controls as in 11.3.1, but set Trigger Slope to +Ext and patch from Type 180 Trigger Output connector to scope Trigger Input.
  • Page 86 11.4.2.3 usec/cm: Display 10 me sine waves from Time-Mark generator. Increase deflection if necessary, for 4 cm display. Adjust C99J (lowest of three on Time/Cm switch) for timing of last half of sweep; adjust compression trimmer C267 (on Mag Gain pot terminals) for timing of first half of sweep. Touch up C99J, then C267 for correct timing over middle 11.4.2.4 .02 nsec/cm: At .1 psec/cm, Magnifier on, apply 2 cm (more...
  • Page 87 11.5 HORIZONTAL AMPLIFIER INPUT COMPENSATION: 11 .5.1 Compensation Check: Set front-panel controls as follows: Control Setting Control Setting Stabil ity "Triggerable" Triggering Mode AC Slow Triggering Level About 1/8" CW from 0. Trigger Slope + Ext Time/Cm psec/cm Hor. Display M .S .
  • Page 88 DELAY AND LOCKOUT SYSTEM. FIGURE 12-1 Complete Lockout Cycle. Solid line: Waveform at grid of V58A; also at cathodes of V37B, V43A and V54A. Dotted line: Waveform at grid of V54A. Voltage Levels: Quiescent level of Trigger Gate Generator cathodes. "Lockout ’Level"...
  • Page 89 DELAYED TRIGGER. 12.1.1 Check? Turn Horizontal Display Switch to Main Sweep Normal and free-run Main Sweep a tlO p se c/cm . With Delay Time M u ltip lier set to 2.00, patch from Del'd Trig connector to vertical input, setting Volts/Cm to 5. Check for 5v minimum trigger, positive-going.
  • Page 90 12.2 LOCKOUT LEVEL: 12.2.1 Check: Remove patch set up in 12.1, set vertical Volts/Cm to .5 and attach 10X probe. Check probe compensation, then use hook or pincer tip to attach to grid end (away from switch) of C58, the 27pf capacitor from the Trigger Slope/Mode switch to V58 pin 2.
  • Page 91 12.3 SINGLE SWEEP CHECK: 12.3.1 Manual Sweep: Remove probe from C58, set Calibrator for lOv output, and attach probe to Cal Out connector. Turn Delaying Sweep Generator off and Horizontal Display to Main Sweep Delayed. With Main Sweep Stability fu ll clockwise, press Reset button several times. One sweep should be generated each time.
  • Page 92 12.4 PICKOFF DRIFT: 12.4.1 Check: Set front panel controls as follows: Horizontal Display Main Sweep Delayed Main Sweep Stability Clockwise Trigger Mode AC Slow Time/Cm .5 psec/cm Magnifier O ff Time/Cm or Delay Time 500 psec/cm Delay Time M ultiplier 5.00 Slope (Toggle Switch) + (Important)
  • Page 93 12.5.3 Linearity Check: Using Main Sweep Delayed display, log dial settings required to position each of the middle 9 markers as in Fig. 11-2. Maximum linearity error should not exceed small dial divisions ( . 12.5.4 Troubleshooting: 12.5.4.1 Excessive Linearity Error: Try replacing V190, V150 and/or V I80;...
  • Page 94 DELAYING SWEEP CALIBRATION . 13.1 SLOW SWEEPS: 13 01.1 Checkout: Set up triggering of Delaying Sweep as in 1205« Apply Time Marks from Type 180 (A) as indicated in table, and with Main Sweep Time/Cm settings as in table, log Delay Time M u ltip lie r setting required to display 9 cm marker as in Fig 11-2 for each Delaying Sweep Time/Cm setting in the table.
  • Page 95 13„2„2 5 usec/cm Range: (Continued) Log 1cm and 9 cm dial readings for 10 |asec/cm and 2 jjsec/cm sweeps. Difference between readings, as before, must be 8.00 ± 0 .0 5 , for each sweep rate. 13.2.3 Troubleshooting: 13.2.3.1 Excessive Timing Error: Examine Delaying Sweep display closely, and see if direct display error corresponds to error indicated by H eiidia l.
  • Page 96 HQLDOFF SYSTEM. 14.1 MAIN SWEEP: Free-run Main Sweep. Attach probe from test scope to + Gate. Main Sweep connector. Set test scope to trigger on "-slope". Check holdoff time (tir rime i Cal Record. Be sure probe is properly cc .
  • Page 97 VERTICAL AMPLIFIER AND DELAY LINE COMPENSATION. •5.1 INITIAL PERFORMANCE CHECK: Install Type (53/54) P plug-in and preset front- panel controls as follows: T ri ggerable Horizontal Display Stabi1i ty Main Swp. Norm. Trigger Slope Triggering Level + 1 nt .1 psec Triggering Mode Time/Cm AC Fast...
  • Page 98 15.2 RISETIME MEASUREMENT (P-Unit): Log serial number of Type P Unit used, in Cal Record. With front panel controls set as in 15.1, proceed as follows to measure the oscilloscope risetime*. Increase Main Sweep Time/Cm to .1 psec/cm. Turn Magnifier O n. (For .02 psec/cm display). Turn Stability control full right.
  • Page 99 15.3 RISETIME MEASUREMENT (107): Remove P-Unit, install Type K or Type L plug-in. Turn Volts/Cm to .05, DC coupled, with Variable full clockwise. Attach Type B52R terminating resistor to vertical input. Connect 42" length of 52-Q coaxial cable to the free end of the terminating resistor and to the output connector of the Type 107 Square-Wave generator.
  • Page 100 CRT. Small wrinkles should be trimmed out using Type K or Type L plug-in, to assure correct response. *Additional threaded slugs are Tektronix p/n 276-506. 3-66 CALIBRATION AND MAINTENANCE PROCEDURE...
  • Page 101 15.5 ADJUSTMENT: FIG. 15-6. Significant' portions of step- function display. "Preshoot" — normal, if not excessive. About 5% is normal, using Type 107. Risetime, 10% to 90%. Affected primarily by peaking coils in vertical amplifier and at CRT. Exaggerated here. Actual value with P-Unit or fast-rise plug-in, 12 nsec |jsec).
  • Page 102 15.5.1 Analysis: Using the Type 107 and a Type (53/54) K or L plug-in, connected as in 15.3, check through the list of aberrations below to determine how extensive a realignment w ill be required. Excessive Termination Bump: Readjust reverse termination capacitors, plate line capacitors, and 3 or 4 delay-line capcitors nearest to CRT.
  • Page 103 15.5.2 Adjustment Steps: Perform as many of the indicated adjustments as may be required. First objective is always a smooth display; second is proper risetime; third is proper bandwidth. (Bandwidth measurement is primarily a check on the accuracy of risetime measurement.) 15.5.2.1 Variable Inductors: Check the positions of the slugs in the variable inductors against the settings indicated in the tables below (see...
  • Page 104 15.5.2.3 Eliminating Wrinkles: For any given coil adjustment, some correction of delay line and distributed am plifier plate line capacitors w ill probably be required to smooth out transient response and eliminate echoes ("wrinkles") the step-function response. Use Type 107 Square wave generator, and Type K or L plug-in, connected as in 15.3.
  • Page 105 15.5.2.4 Coil Adjustments: Check risetime as in 15.2, using P U nit. If this is now nsec psec), proceed with bandwidth measure­ ( . 0 1 2 ment. If not, adjust inductors as indicated below. To increase bandwidth, reduce risetime: Increase the in ­ ductance of the CRT input inductors slightly by adjusting the two cores equally a slight amount, further into the coils.
  • Page 106 15.6 TROUBLESHOOT 1N 6 : Most common malfunctions and aberrations in the vertical ampli fier ci rcui try will have been cleaned up by tube and component replace­ ments in Steps 7 and 15.1° Li sted below are some of the unusual and in­ frequent failures causi ng effects only noticeable duri ng fast-ri se obser­...
  • Page 107 FRONT-PANEL WAVEFORMS. 16.1 SAWTOOTH. MAIN SWEEP: 16.1.1 Check Waveform: Free-run Main Sweep. Using DC-Coupled test-scope, check the amplitude of the sawtooth waveform at each sweep-rate from 1 sec/cm to 10 psec/cm. Sawtooth should reach approximately +150 v, and return to about 0 v for each sweep. Check linearity of waveform and confirm that at least a portion of the "holdoff"...
  • Page 108 Z-AX1S INPUT. 17.1 MEASUREMENT: Remove cathode-input strap between ground and cathode input terminals at the rear of the instrument. Using coax or a long test lead, patch from the Cal Out connector to the Cathode input terminal, and also to the Trigger Input terminal for the Main Sweep.
  • Page 109 MISCELLANEOUS PERFORMANCE NOTES. This segment of the calibration record is reserved for notes which may be of help to instrument operators and future calibrators in making best use of the instrument and in main­ taining it better: Some things which typically might be noted here: Instrument peculiarities.
  • Page 110 SECTION 4 Type 545 Oscilloscope CALIBRATION RECORD Serial N o.__________ Organization Calibrated__________ Re-Cal Due Date____ Department By:-------------------------- PHYSICAL CHECKOUT. PARTS REPLACED Damage Check A ir Filter: Condition Washed T reated Fan Motor: Condition Oiled Clean HV, CRT Graticule, Etc. Fuse Size POWER SUPPLY.
  • Page 111 PARTS SQUARE-WAVE CALIBRATOR. REPLACED Test Point Voltage (DC meter) 3.1.1 DC Reference (Cal "O ff") 3 .1 .2 Symmetry (Cal "On") Adjustment required? 3 . 2 HIGH VOLTAGE SUPPLIES. Operation and Regulation: 4.1.1 H .V . Test Point Cathode Supply Regulation: 4 .1 .2.1 High Line, Low Load 4 .1 .2 .2...
  • Page 112 PARTS REPLACED VERTICAL AMPLIFIER (Initial Alignment). Vertical Amplifier Precheck: 7.1.1 Microphonics .2 Input Stage Check __________ 7 .1 .3 Interface Check _________ Vertical Balance: Log+ or - Imbalance as indicated. 7.2.1 Overall Imbalance: Initial Final 7 .2 .2 Balancing: 7.2.2.1 DA Grids Shorted 7 .2 .2 .2 DA Bias...
  • Page 113 PARTS REPLACED TRIGGER CIRCUITS, MAIN SWEEP: Preliminary Checkout: Realignmentr 9.2.1 Triggering Level Knob Zero 9 .2 .2 Gas Check 9.2.3 Internal Adjustments 9.2.3.1 Trigger Level Centering 9 .2 .3 .2 D. C. Level A d j. 9 .2 .3 .3 Touch-Up 9 .2 .3 .4 Trigger Sensitivity...
  • Page 114 COMPONENTS REPLACED 11. SWEEP CALIBRATION. 11.1.1 Sweep Calibration, Initial Error __________% 11.1.1.2 Sweep Cal Adj _________ 11.1.2 Magnifier, Initial Error Linearity Check __________% 11.1.2.2 Mag Gain Adj __________ 11.1.3 Sweep/Mag Regis Adj __________ 11.1.4 Sweep Am plifier Check __________ 11.1.5 Main Sweep, Initial Error __________% 11 .1 .5.2...
  • Page 115 COMPONENTS REPLACED 12. DELAY AND LOCKOUT SYSTEM. Delayed Trigger Check: From MS v min 12.1 From DS v min Lockout Level (R64) Set: 12.2 Manual 12.3 Single-Sweep Check: Triggered Reset Rate Gen. 12.4 Pickoff Drift, 5 sec: 12.5 Delay Start/Stop: Start (dial) Initia l:...
  • Page 116 COMPONENTS REPLACED 14. HOLDOFF TIMES. Main Sweep 1 sec/cm - 100 msec/cm msec/cm msec/cm psec/cm psec/cm 10-1 psec/cm Delaying Sweep 10-2 msec/cm msec — 200 psec/cm psec/cm 100-20 psec/cm 10-2 15. VERTICAL AMPLIFIER AND DELAY LINE COMPENSATION. 15.1,1 Tube Condition Recheck 15.2 With P-Unit, S /N _________ Risetime nsec...
  • Page 117 A stocks as follows: 8 ea "raw" 6BQ.7A (Sylvania) and 2 ea, Tektronix, Inc. selected and aged 6BQ7A, P/N 157-022 for use in horizontal output circuits (V265 & V272.) Tube stocks mai ntai ned at i ndi cated 1evels should be adequate for I-6 i nstruments.
  • Page 118 A p r il 1959 TYPE 545 A ll changes made t o Type 545 a t SN 9292 were incorporated in RM45 SN 101 C apacitors E ffe c tiv e SN Fixed Cer. 500 v ±1 uuf 281-501 4 .7 uuf...
  • Page 119 TYPE 5^5 C apacitors Cont. 500 v Cer. Fixed l l - O O v ~C±b'6k Cl58c~ "CI5®- TfldiT5l35~&~up 500 V 500 V Cl 87 C190A 500 v Var. "C190D" - 8179 “101 “Ci90D“ ' 8180 & up C190F C197 Pi xed $00 Y____ ^ ________________ C228...
  • Page 120 TYPE 5^5 April 1959 C apacitors Cont. 285-510 .01 uf Pixed ±1 uuf 0707 285-510 400 v C711 • 01 \ l x 290-040 E M C 250 V 2x40 uf 0713 281-510 C717 .01 p f 283-002 G M V 500 Y .01 uf Cer.
  • Page 121 April_ 1959 ~$b5 _ _ TYPE Capac it o r s Gont« Add 9292 & up C1039 .001 u f Cer. Fixed 500 v 10 $ 281-536 101 thru 9291 *C1045 2x75 u f Fixed 290-053 -20+50% 10 $ Add 9292 & up .001 u f Cer.
  • Page 122 1959 " TIPS 5^5 -J SF 11 C apacitors Cont. ----- --------- Add~929^ & up CllOTf .7 -3 p p f” Tub. Var. ------ ---- ----------- Add 9292 _& up ____ CII05 150 nxf __ Cer. Fixed ------ 20#------------ 500 v 281-52J Add 9292 &...
  • Page 123 April 1959 ‘TYPE C apacitors Cont« SM101 thru 9291 Delay Line 101 thru 0291 G1201-50 Tub. Var. .7 -3 uuf 500 v 281-027 101 thru 9117 Car. C1260-75 __ 1*3 m l - Fixed 281-535 iu UUf 500 v 9118 thru 9291 C1260-75 Cer.
  • Page 124 April 1959 TYPE 545_________ ____ ----- - ---- - Resistors Cont, ' - - ■ -- ------- Comp, 311-ooS Var. 500 S 2 . —_ —---- ----- 3054223 Comp,__ To/ Fixed 22 l c — 1 0 / 5 302-275 Comp, 2,7 meg 1/2 T Fixed...
  • Page 125 __________________A p ril 1959 Type 5/5______________________________________ R e sisto r s Cont * Fixed Comp* 3 0 2 -/7 3 1 /2 w 1*7 k io ir Comp* 3 0 2 -1 0 / 100 k l / 2 w Fixed 10$ ‘...
  • Page 126 April 1959 TIRE R e sisto r s Cont. ¥ 100 k R108 Fixed 10 % Comp. 302-104 1 / 2 Fixed Comp. 1 /2 302-570 47 a Added 5646 & up R109 Fixed P rec. 309-014 1 meg 1 /2 w R110 Fixed Comp.
  • Page 127 1/2 ¥ 2 ,2 k Fixed Comp. 302-222 R254 Changes made to Type 545 at SN 13,344 ¥ere made to RM45 at SN 306. Changes made to Type 545 at SN 14.223 were made to RK45 at SN 419. Page 10...
  • Page 128 1959 TYPE 545 R e sis to r s Cont, 1 Changes made t o Type 545 a t 13,344 were made to R M 4-5 a t 306 , R25 a t SN 14,223 were made to RK45 a t an 419...
  • Page 129 April 1959 □ TYRE 545 R e sisto r s Cont. 470 k 1 /2 w Fixed Comp. 1 0 / j -0 1 thru 9406 302-474/ R295 | 9407 & up R295 1 /2 w 302-824 820 k Fixed Como.
  • Page 130 April 1959 TYPE 545 Resistors Cont, Added 221 & up *R724 25 w Fixed 5 7 1 308-037__ 101 thru 220 *R725 25 w Fixed k J W 5 7 . 308-037 221 thru 5367 R725 Deleted, fBecame R724) 306-103...
  • Page 131 April 1959 TYPE 545 Resistors Cont Fixed Prec. 310-056 333 k 1/2 w 101 thru 1505 R772 i r n r n t 310-056 R772 333 k 1506 & up io 0 304-100 Added 5368 & R777 Comp. 107L 87 k...
  • Page 132 April 1959 TYPE Resistors Cont, R810 1/2 w Fixed Comp, 302-676 R811 2 meg Var, Comp, 311-0)i2 R812 2.2 meg 1/2 w Fixed Comp, 302-225 6.7 meg 1/2 w Fixed ” Comp, R813 302-575” 6,7 meg 1/2 Fixed Comp, R8l6 io/~ 302-675 U * 7 meg 1/2 w...
  • Page 133 Changes made to Type 545 at SIT 11,692 v ere made to R M 45 at SR 206. Changes made to Type 545 a t SiJ 11.905 v ere made to R M 45 at SR 209. ——----------------------------------------------------------------------- ——--- ——----— —...
  • Page 134 April 1959 TYPE 5 Z45 R e sisto r s Cont. Fixed Comp. 306-153 15 k 2 w..1036 101 thru 9291 R1055 Fixed 308-066 9292 & up 4 .5 k R1055 Fixed Comp. *R1056 1 meg 302-105 101 thru 9291 Fixed Comp.
  • Page 135 _________________________ April 1959 TYFS^h$ R e sisto r s Cont • | Add 9292-9596 R1Q98 Fixed Comp, 10$6 15 k 302-153 (s e v e r a l instrum ents m odified out o f sequence}- ~ d e le te d R1098 9597 &...
  • Page 136 R e sisto r s Cont, 101 thru 9117 9118 th ru 9291 101 thru 9H 7 9118 thru 9291 101 thru 9117 >1205 _ 308-066 TiTft thru 9291 Fixed 5$_______ 302-681 R1205 10 $ > 292 Fixed & Comp* _2_”_ J11206 302-102...
  • Page 137 700-00f~ 1 211 thru 312 12.041 3 .2 uh 700-000 108-103 Fixed Changes made to TVpe 545 a t SN 11.905 were made *to at. SN Note: * C ircu it numbers DELETED - SN 929? and uo. O ft...
  • Page 138 April 1959 TYPE 5^5 __________________________________ Inductors Cont. ".... ~ A ll changes made to Type 5; i5 a t SN 10,120 wore made to RM45 a t SN 172. L1041 313 thru 8397 2 .5 M -h Fixed 108-103 114-079 *L104l 1 .8 -3 .7 p.h Var.
  • Page 139 April 1959 TYPE 545 Knobs Old Type-------- New Tyne 101 thru 1051______ 1052 & up Except* Plus* Knob. red. white dot. for 1/8" shaft 366-017 366-038 Used: Trie.Mode: Leneth (Delaying Sweep): 5X Maenifier: _________ Multiplier: Sa. Wave Calibrator.___ (5)___ Knob. red. white dot. for 3/16" shaft...
  • Page 140 T801 CRT Supply____________ _______ 120-036__ Vacuum Tubes All changes made to Type 545 at SN 1.3.244 were made to RM4.5 at SK306 1 Q . L - - - -13 343___ . 6T1C7 A Tr - i c r...
  • Page 141 April ____ 1252_ T I E Vacuum Tuber; Cont, A ll changes made to Ttype 545 a t SN 13,344 were made to RM45 a t BN _____ 154-047 -M u ltiv ib ra to r 12BY7 _ . .
  • Page 142 A p r i l . .1959 Tii jj M iscellaneous Bar, top support w ith handles 5001 & up 381-067 Binding p o s t, 5-way 129-001 Binding p o s t, ground 129-020 101 - 5000 C abinet, one p ie c e 437-018 5001 &...