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Tektronix 3B5 Instruction Manual
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Tektronix 3B5 Instruction Manual

Tektronix 3B5 Instruction Manual

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erial Number _____________
YPE 3B5
AU OMA IC/
PROGRAMMABLE
IME BASE
ektronix, Inc.
.W. Millikan Way • P. O. Box 500 • Beaverton, Oregon 97005 • Phone 644-0161
• Cables: Tektronix
666
070-0538-00

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  • Page 1 Number _____________ YPE 3B5 AU OMA IC/ PROGRAMMABLE IME BASE ektronix, Inc. .W. Millikan Way • P. O. Box 500 • Beaverton, Oregon 97005 • Phone 644-0161 • Cables: Tektronix 070-0538-00...
  • Page 2 All Tektronix inst-uments are warranted against defective materials and workman ­ ship for one year. Tektronix transformers, manufactured in our own plant, are war ­ ranted for the life of the instrument. Any questions with respect to the war ­...
  • Page 3 ection Characteristics ection Operating Instructions ection Circuit Description ection Maintenance ection Performance Check ection Calibration Abbreviations and ymbols Parts Ordering Information ection 7 Electrical Parts List Mechanical Parts List Information ection 8 Mechanical Parts List ection 9 Diagrams Mechanical Parts List Illustrations Accessories Abbreviations and symbols used in this manual...
  • Page 5 A front-panel illuminated readout panel indicates sweep Tektronix oscilloscopes which accept 3-series time-base units 1 . rate, magnified sweep (with correct indication of magnified The Type 3B5 provides automatic sweep rate and trigger sweep rate), non-triggered sweep and uncalibrated sweep. seeking on eek command either from the front-panel The readout panel functions in all modes of operation.
  • Page 6 Characteristic Performance Requirement upplemental Information weep Rates Manual Mode 5 seconds/division to 10 nanoseconds/division elected by front-panel MANUAL TIME/ in 27 calibrated steps. weep rate indicated DIV switch. teps in 1-2-5 sequence on readout panel eek Mode 5 seconds/division to 3.1 microseconds/divi- Automatically selected when seek com ­...
  • Page 7 Magnifier Delay Analog current change between about 350 and 200 microamps at terminal 17 of PROGRAM connector provides 0 to 10 division external delay range External Mode Command Type 3B5 switches to External Mode when terminal PROGRAM connector grounded Remote...
  • Page 8 Aluminum alloy Panel Aluminum alloy with anodized finish tandard accessories supplied with the Type 3B5 are listed Circuit boards Glass-expoxy laminate on the last pullout page at the rear of this manual. For optional accessories available for use with this instrument,...
  • Page 9 All controls and connectors required for the operation of The Type 3B5 operates with the indicator oscilloscope and the Type 3B5 are located on the front panel of the unit (see an amplifier unit to form a complete oscilloscope system.
  • Page 11 Auto Trigger Light indicates that sweep is triggered in MANUAL elects the sweep rate of the sweep gen- (not labeled) the auto trigger mode. TIME/DIV erator in the Manual Mode of operation. When in eek Mode operation, mode auto ­ LEVEL Normal Triggering —...
  • Page 12 As desired The following steps will demonstrate the basic function of the controls and connectors of the Type 3B5 and also dem ­ Power onstrate the basic operation of this unit. It is recommended that this procedure be followed completely for first-time 7.
  • Page 13 Press the seek button on the probe. Note to midrange and the amplifier unit to the seek mode. that both the amplifier unit and the Type 3B5 switch to the eek Mode and a stable, correct display is shown.
  • Page 14 Allow time for the seek circuits to recycle between adjustments (one to two seconds). Fig. 2-2 shows the front panel of the Type 3B5 along with an enlarged view of the PROGRAM connector. This chart NOTE can be reproduced and used as a test-setup record for special measurements, applications or procedures, or it may This adjustment selects a nominal range of opera ­...
  • Page 16 triggering point may be enough so it is impossible to main ­ tain a stable display. In such cases, use DC coupling. The sweep is automatically triggered in the INT-AUTO DC trigger coupling is available only when the position of the Trigger Function switch (or when selected by sweep is triggered from an external signal in the EXT posi ­...
  • Page 18 tions. This signal is also connected to terminal 18 of the interconnecting plug for operation of special purpose ampli ­ fier units (such as spectrum analyzer plug-ins). The sweep rate can be increased 10 or 100 times with the DLY'D WP MAG switch (or by external program) to magnify the portion of the trace which follows the delay period.
  • Page 19 To avoid this, the Type 3B5 can be used in the single-sweep mode by con ­ necting the circuit shown in Fig. 2-7 to the PROGRAM con ­...
  • Page 20 (or the LEVEL control is incorrectly set), the seek circuits unit, both units seek but the Type 3B5 seek circuits operate switch to auto triggering and again check for a trigger after the amplifier unit has completed its cycle. The Type signal.
  • Page 21 J30 is as seen when looking at the front panel of 10 milliamps 10 ms, 1 ms Digital the Type 3B5 (same as when looking at the rear of the 0.1 ms, 10 μ s Digital 10 milliamps mating connector).
  • Page 22 EXT button depressed). If more than one external program is connected to the Type 3B5, diode isolation, negative bias levels ( — 12 volts) and program switching must be provided to isolate the inactive programs from the active program.
  • Page 23 5. Adjust the amplifier unit position control to move the points between which the time measurement is made to the center horizontal line. 6. Adjust the Type 3B5 PO ITION control to move the starting point of the time measurement area to the first graticule line.
  • Page 24 (or the points on the display between which the measurement is made) in relation to the center horizontal line. 8. Adjust the Type 3B5 PO ITION control so the channel 1 (reference) waveform crosses the center horizontal line at a vertical graticule line.
  • Page 25 The delayed sweep magnifier can be used to make more precise time measurements. Overall accuracy of the time measurement will be affected by the following factors. a. Accuracy of the weep Generator at the sweep rate used. b. DELAY dial incremental linearity. The following measurement determines the time difference between two pulses displayed on the same trace.
  • Page 26 7. If necessary, adjust the Type 3B5 PO ITION control to display the complete magnified portion. 8. Time measurements can be made on this portion of the display in the normal manner. The magnified sweep rate is indicated on the readout panel.
  • Page 27 To make the comparison, use the following procedure: 9. Turn the Type 3B5 VARIABLE control until one cycle et the amplifier unit input coupling switches to the of the reference signal (channel 1) occupies exactly eight same position, depending on the type of coupling desired.
  • Page 28 More accurate dual-trace phase measurements can be made by increasing the sweep rate (without changing the VARIABLE control setting as established in the preceding method). One of the easiest ways to increase the sweep rate is with the DLY'D WP MAG switch. The magnified sweep rate is determined by dividing the sweep rate obtained previously by the magnification.
  • Page 29 DLY'D WP MAG switch located in the Readout Logic circuit. A simplified block diagram of the Type 3B5 is shown in The Readout Board provides the front-panel readout of Fig. 3-1. Only the basic interconnections between the indi ­ instrument operation. The bulbs which produce the readout vidual blocks are shown on this diagram.
  • Page 30 TIME/DIV switch and DLY ’ D WP MAG switch provide the If auto triggering is programmed, the front-panel LEVEL correct normal and magnified sweep rate readout on the control determines the starting level of the display. readout panel. The operating circuits for the eek Mode of operation are shown in Fig.
  • Page 36 o * o ♦-...
  • Page 37 The DC level of the trigger signal at the emitter of Q23 can be varied by the LEVEL control, the Auto Trigger P-P Q74 and Q84 are connected as a comparator. The com ­ Level stage or external program trigger level. This also parator is referenced to ground through R94 at the base changes the bias level on Q74 and determines the change...
  • Page 38 described for positive-slope triggering in the Manual Mode. To change the trigger slope to minus, grounding external lope Multivibrator, Q75 and Q85, selects the lope program slope logic is connected to terminal 27 of J30. Comparator output signal which triggers the sweep. This is This raises the level at the base of Q85 positive to forward accomplished by forward biasing either D66 or D96.
  • Page 39 trigger signal at this point is basically a rectangular pulse signal across R25B at all times. Due to some losses in the with a fast rise and fall. The width of this pulse depends circuit, this voltage will be slightly lower than the total upon the input signal waveshape and the LEVEL control this positive level.
  • Page 40 the Trigger Latch Circuit is on, the front-panel trigger controls 2. If the unit is no longer cor ­ determine the circuit operation. However, if the unit is not rectly triggered after correct correctly triggered, the output level of the Bright Baseline triggering been estab ­...
  • Page 41 level-control current from the front-panel LEVEL control is For External Mode operation, — 12.2 shunted away from the Trigger Level Amplifier. No connec ­ volts External Power is applied to the base of Q634 through tions are made to K3 or K4 so no control current flows D635.
  • Page 42 the base of Q54 is pulled toward — 12.2 volts by the Manual Current flows through K4 and K4-1 closes to provide D C­ Power applied as previously discussed. The Trigger Latch coupling of the signal to the Input Emitter Follower. Also, Circuit turns on and forward biases D52 and reverse biases D45 is forward biased and current flows through K3 to D9.
  • Page 43 level current and D52 is reverse biased to disconnect the For Ext AC operation, grounding external program function Trigger Function switch. Now, trigger source, coupling and logic is connected to terminal 30 of J30. This places a zero ­ mode are selected connecting grounding (zero-volt...
  • Page 44 delayed, magnified sweep as controlled by the Delay and Follower and the Timing Capacitor and Resistor stages all Timing Circuit. The Bright Baseline stage allows the weep operate together to produce the sawtooth for horizontal Generator circuit to free-run when a trigger signal is not sweep.
  • Page 46 overall sawtooth level and the sawtooth must run up farther cuit is reset and the weep Gate tunnel diode returns to to forward bias D228. The effect is a longer sweep of a bias level that allows it to switch on the next trigger pulse. between 12 and 15 divisions for magnified operation.
  • Page 47 level follows the base, the voltage at the emitter is about 0.5 volt less positive to establish the desired source voltage. The Delay and Timing Circuit selects a Timing Resistor and Timing Capacitor to determine the sweep rate of the sawtooth produced by the weep Generator circuit.
  • Page 49 turned on. This allows any portion of the sweep to be at the tenth division of display. Only the portion of the magnified by selecting, with the DELAY control, the voltage trace following the tenth division is magnified (the sweep level on the sawtooth where the delayed sweep magnifier length is increased several divisions for magnified operation;...
  • Page 50 For all sweep rates, the VARIABLE control, R397, adds determined by the multiplier logic). The timing current in additional resistance in series with the Timing Resistor when the other two timing groups is shunted away from the timing not in the CAL detent. This provides continuously variable, capacitor.
  • Page 54 zener diode D375 sets the level at the emitter of Q374 to — 6 volts. ince its base is held near zero volts, Q374 is reverse biased. The collector of Q374 goes negative toward The Delayed weep Magnifier Readout Control stage indi ­ the —...
  • Page 55 CRT for horizontal deflection. This circuit contains the hori ­ zontal positioning network and an adjustment to calibrate Q534, Q543 and V544 are connected as a feedback ampli ­ the horizontal gain of this unit to the deflection sensitivity fier for gain stabilization and linear output to the CRT of the indicator oscilloscope.
  • Page 56 indications for Manual Mode operation. The wiper contacts from the decade readout. The 5 and s/DIV readouts are of these switches are connected to Manual Power through on as controlled by other circuits previously discussed. For diodes. In the Manual Mode of operation, — 12.2 volts X10 delayed sweep magnification, the DLY ’...
  • Page 57 Circuit initiates the automatic time-base and in Fig. 3-20. The 1 ms decade logic is still — 12 volts. How ­ trigger seeking functions of the Type 3B5 upon receipt of a ever, the X10 magnifier logic line is at — 12 volts and the seek command.
  • Page 62 ■...
  • Page 64 unit is connected to this unit through terminal 3 of the inter ­ for the "1 ” multiplier and 0.1 μ s decade (h) logic levels. connecting plug and the interconnecting cables in the indi ­ When both of these logic levels are — 12 volts, the base of cator oscilloscope.
  • Page 65 to run up at this sweep rate. The Advance Pulse Generator is not turned on by the trigger pulse which starts the sweep, due to normal delay time designed into this circuit. However, if the next trigger pulse is applied to Q665 before the saw ­ The Counter Circuit produces the multiplier and decade tooth turns the Window Gate circuit on (i.e., collector of logic levels for the...
  • Page 68 to lock out the remaining transistors in the B group. The decade logic output on the 0.1 s decade (b) logic line (0.1 eek Mode operation, Q815 and Q825 are coupled second timing decade) is — 12 volts. This action continues as a bistable multivibrator.
  • Page 69 As this switch is rotated between steps, amplifier unit program connector. When the Type 3B5 the ground connection for the divider is momentarily opened. front-panel EEK button is pressed, W604 raises the base The base of Q905 goes negative and it shuts off.
  • Page 73 lector current flows through B925 and the EXT light comes disconnected from Q944 and the circuit is controlled by on. This bulb drops about six volts of the — 12-volt level external program magnifier logic through terminal 33, 34 at the collector of Q925 to provide current to the — 6-volt or 36 of J30.
  • Page 74 shunt diodes in the Readout Logic circuit. (The X100 mag ­ nifier logic level may be zero volts for X100 magnification in some positions of the MANUAL TIME/DIV switch.) The Readout Board circuit shown on diagram 10 shows the connection to this board and the bulbs which produce the readout-panel display.
  • Page 75 Loose dust accumulated on the front panel of circuits. Complete calibration instructions are given in the the Type 3B5 can be removed with a soft cloth or small Calibration section. paint brush. The paint brush is particularly useful for dis ­...
  • Page 76 Readout Board Fig. 4-6 through 4-13 show The following equipment is useful for troubleshooting the the circuit boards and cards used in the Type 3B5. Fig. 4-5 Type 3B5. shows the location of each board within the instrument. Each electrical component on the boards is identified by 1.
  • Page 77 Before proceeding Purpose: Permits access to the circuit cards in this unit. with troubleshooting of the Type 3B5, check that the equip ­ ment used with this instrument is operating correctly. Check that the signal is properly connected and that the intercon ­...
  • Page 78 (preferably another Type 3B5 or table provides setup information to insure that the controls similar unit). If the trouble persists after substitution, the are not incorrectly set. Following the setup information, a indicator oscilloscope or amplifier unit are defective.
  • Page 79 An open capacitor can best be in the Type 3B5. Components which are soldered in place detected with a capacitance meter or by checking whether can be checked most easily by disconnecting one end. This the capacitor passes AC signals.
  • Page 80 3% silver is usually available locally or it can be purchased from Tektronix in one-pound rolls; order by Tektronix Part Number 251-0514-00. To replace a ceramic terminal strip, use the following...
  • Page 81 REPLACEMENT: 4. To replace the board, reverse the order of removal. Correct location of the pin connectors is shown in Figs. 4-6 1. Place the spacers in the chassis holes. through 4-13. Replace the pin connectors carefully so they mate correctly with the pins. If forced into place incorrectly 2.
  • Page 82 The glass reed-relays 2. Position the new reed-relay in exactly the same physical used in this instrument are pressurized. Therefore, safety position as the old one. glasses should be worn to protect the eyes when replacing these relays. To avoid damage to the reed-relays, do not 3.
  • Page 83 assembled. Better access is provided by partially disas ­ 5. Hold the front panel with one hand and slide the sembling the unit as follows-. entire assembly to the rear as far as the cabling allows. 6. Reverse the order of removal to reassemble the unit. 1.
  • Page 86 ®...
  • Page 93 1. Indicator oscilloscope. Must be compatible with the The following procedure uses the equipment listed under Type 3B5 and must be capable of supplying the necessary Recommended Equipment. If equipment is substituted, con ­ power. Tektronix Type 561 A Oscilloscope recommended.
  • Page 94 Turn the LEVEL control fully counterclockwise. to connect the generator ouput to the BNC cable). Connect the output of the BNC T connector to the Type 3B5 EXT d. CHECK — table CRT display for both + and — slope TRIG INPUT connector with a BNC cable.
  • Page 95 Press the CHANGE LOPE button. T connector. Connect the output of the BNC T connector to the Type 3B5 EXT TRIG INPUT connector with a 50-ohm f. CHECK — CRT display starts on the negative slope of BNC cable.
  • Page 96 (This adjustment should CHECK — table CRT display can be obtained with the checked and readjusted as necessary when the Type 3B5 is LEVEL control for both -|- and — slope triggering. inserted into a plug-in compartment other than the one in u.
  • Page 97 e. CHECK — CRT display for sweep length between 12 and 15 divisions as shown by two to five divisions of display to the right of the center vertical line (see Fig. 5-4B). et the DLY ’ D WP MAG switch to XI 00. g.
  • Page 98 et the MANUAL TIME/DIV switch to 5 ms (sweep read ­ out 50 μ s/DIV). REQUIREMENT — 3 parts or less per 10,000. the time-mark generator for five - millisecond markers. et the time-mark generator for one - millisecond CHECK — et the DELAY dial to each major dial division markers.
  • Page 99 et the time-mark generator for five - microsecond markers. c. Move the marker to the first graticule line with the PO ITION control (see Fig. 5-7A). et the MANUAL TIME/DIV switch to 50 ns. e. CHECK — Marker should remain within ±1 division of the first graticule line (see Fig.
  • Page 100 f. Move the nearest marker to the vertical graticule MANUAL TIME/DIV switch. witch settings, time-mark gen ­ line. erator output, readout-panel indications and tolerances are given in Table 5-1. First, check timing and readout with the g. CHECK — Normal and magnified timing accuracy and DLY'D WP MAG switch at OFF, then at X10 and XI 00 correct readour-panel indications in all positions of the...
  • Page 101 Press the seek button on the remote-seeking probe. the marker display below the viewing area. d. CHECK — Both the amplifier unit and the Type 3B5 h. Disconnect the trigger cable. seek a stable CRT display showing between two and six cycles horizontally and two to six divisions vertically (may vary due to calibration of front-panel adjustments).
  • Page 102 ±0.1 division; see Fig. 5-9 (0.05 milliamp/division, ±10%, output from Type 3B5). REQUIREMENT — Trace intensity increased for X 1 0 and X1 00 magnified operation.
  • Page 103 No test procedure is given here for checking the external b. CHECK — Two dots displayed on screen about two programmed operation of this unit. If a Tektronix external divisions apart (deflection factor about 5 volts/division, see programmer is used, a complete checkout procedure for the Fig.
  • Page 105 This short-form calibration procedure is provided to aid in 3. Remote seeking probe. Tektronix P6030 recommended. checking the operation of the Type 3B5. It may be used as a calibration guide by the experienced calibrator, or it may be 4. Constant amplitude sine-wave generator. Frequency, 50 used as a record of calibration.
  • Page 107 Page 6-12. seeking probe, amplifier unit program connector, Alignment of DELAY dial indication with correspond ­ front-panel EEK button and the Type 3B5 PROGRAM ing markers in CRT display. connector. Does not seek when amplifier unit seek button is pressed.
  • Page 108 About — 12.2 volts Beneath each setup picture is a complete list of front ­ Terminal About + 125 volts panel control settings for the Type 3B5 and associated ampli ­ Terminal About — 100 volts fier unit and indicator oscilloscope.
  • Page 109 DLY'D WP MAG to connect the generator output to the BNC cable). Connect DELAY 1.00 the output of the BNC T connector to the Type 3B5 EXT TRIG .5 ms MANUAL TIME/DIV INPUT connector with a BNC cable. VARIABLE et the low-frequency sine-wave generator for a four-...
  • Page 110 a. Change the following control settings: Trigger Function INT-AUTO LEVEL Midrange Volts/Division 1 Volt (amplifier unit) et the low-frequency sine-wave generator for a 0.5- division CRT display (0.5 volt peak to peak) at one kilohertz. (If the amplifier unit is other than a Type 3A5, monitor the voltage at pin CC of the Time-Base Board with the test oscil ­...
  • Page 111 Recheck steps c through h and readjust as necessary. A compromise setting must be established which provides correct triggering for both checks d and g. a. Connect the indicator oscilloscope calibrator output to the amplifier unit input connector and the EXT TRIG INPUT connector with the BNC T connector and two BNC cables.
  • Page 112 WP MAG connector. Connect the output of the BNC T connector to the DELAY 1.00 Type 3B5 EXT TRIG INPUT connector with a 50-ohm BNC cable. VARIABLE et the constant-amplitude generator for a 0.5-division CRT display (0.5 volt peak to peak) at 50 kilohertz (0.7 volt...
  • Page 113 et the Trigger Function switch to EXT-AC. p. Without changing the output amplitude, set the con ­ stant-amplitude generator to 20 megahertz. et the constant-amplitude generator for a one-division CRT display (one volt peak to peak) at 50 kilohertz. et the MANUAL TIME/DIV switch to .1 μ s. et the MANUAL TIME/DIV switch to 20 μ...
  • Page 114 INTERACTION — Check steps 10 — 21. (This adjustment Intensity Visible Display should be checked and readjusted as necessary when the Calibrator 10 Volts Type 3B5 is inserted into a plug-in compartment other than Power the one in which it was calibrated.)
  • Page 115 e. CHECK — CRT display for sweep length between 12 and 15 divisions as shown by two to five divisions of display to et the time-mark generator for 10-millisecond markers. the right of the center vertical line (see Fig. 6-1 0 B). b.
  • Page 116 et the DLY ’ D WP MAG switch to X 1 00. g. CHECK — CRT display shows same sweep length as step et the DELAY dial to 2.00 and then rotate the dial as necessary so the magnified portion starts at the leading edge of the second marker.
  • Page 117 sary so the magnified portion starts at the leading edge of the applicable markers. Check for ±15 minor dial divisions, or less, deviation between the major dial division and the dial setting which produces the correct display (±3% of full scale).
  • Page 118 d. ADJU T — 1 μ s Cal adjustment, C 1 68 (see Fig. 6-1 4B), et the MANUAL TIME/DIV switch to 10 μ s. for one marker each division, c. CHECK — CRT display for one marker each division e.
  • Page 119 μ d. CHECK — CRT display for one marker each division between the first and ninth vertical graticule lines (second and time-mark generator 0.1 -microsecond tenth marker; see Fig. 6-1 6A). markers. e. ADJU T — 0.1 μ s Cal adjustment, C502 (see Fig. 6-1 6B), et the MANUAL TIME/DIV switch to 0.1 μ...
  • Page 120 μ μ...
  • Page 121 Test oscilloscope system Indicator oscilloscope NOTE The Type 3B5 must not be on an extender for Mode steps 17 through 21. Also, the amplifier unit must PO ITION Midrange have a bandpass of at least 10 MHz to check DLY'D WP MAG these steps.
  • Page 122 h. CHECK — Test oscilloscope display for optimum square correct timing and linearity may be necessary when corner at the lower, trailing edge of the waveform (see Fig. checking 1 0-nanosecond timing in step 20. 6-1 8B). m. Disconnect the 10X probe tip. ADJU T —...
  • Page 123 μ Move the nearest marker to the first vertical graticule line. k. CHECK — CRT display for one marker each division et the MANUAL TIME/DIV switch to 10 μ s. between the first and ninth graticule lines (see Fig. 6-20C). b.
  • Page 124 c. ADJU T — C547 and C551 (see Fig. 6-1 8A) slightly for optimum timing and linearity. (Note: readjust only if out ­ side the tolerances listed in step b). d. If adjustments are made, recheck step 19. a. Connect the time-mark generator trigger output con ­ nector to the EXT TRIG INPUT connector with a 50-ohm BNC cable.
  • Page 125 TIMING CHECK (Normal and Magnified) Accuracy (measured be ­ MANUAL Time-Mark Generator Readout-Panel Indication With DLY'D tween first and TIME/DIV Output WP MAG witch et At: Display ninth graticule witch (Markers/ lines; see Fig. etting Markers Trigger XI 00 Division ) 6-22) 10 ns 20 ns...
  • Page 126 et the Trigger Function switch to EXT-DC. timing accuracy between the first and ninth graticule lines. A typical CRT display is shown in Fig. 6-22. et the LEVEL control for a stable display, e. CHECK — Normal and magnified timing accuracy and CAUTION correct readout-panel indications in all positions of the MAN ­...
  • Page 127 Connect the 10X probe to the test oscilloscope system Type 3B5). Lay the indicator oscilloscope on its left side. and connect the probe tip to pin 8 of J400 (Logic Card; see Fig.
  • Page 128 Connect the probe tip to the indicator oscilloscope cali ­ brator output connector. c. Press the seek button on the remote-seeking probe. d. CHECK — Both the amplifier unit and the Type 3B5 seek a stable CRT display showing between two and six cycles...
  • Page 129 (leave on continuous seek) as the frequency is f. CHECK — Both the amplifier unit and the Type 3B5 seek increased. Allow time for the seek circuits to recycle (about a stable CRT display (units continuously recycle approximately one to two seconds) before increasing the frequency.
  • Page 130 g. CHECK — Test oscilloscope display for a trace about CHECK — Test oscilloscope display for a trace near the three divisions below the zero-volt level during the magnified zero-volt level during the magnified sweep time. sweep time ( — 6 volts; see Fig. 6-28B). NOTE The DC level returns to about —...
  • Page 131 CHECK — Test oscilloscope display for about three cycles of the sawtooth signal and a vertical deflection of one divi ­ sion, ±0.1 division; see Fig. 6-29B (0.05 milliamp/division, ±10%, output from Type 3B5). et the test oscilloscope vertical deflection to one volt/ division (10 volts/division including probe).
  • Page 132 Calibrator 10 Volts Power Mode PO ITION Midrange a. Connect the DC voltmeter from terminal 1 of the PRO ­ DLY'D WP MAG GRAM connector (see Fig. 6-32) to chassis ground. DELAY 0.00 b. CHECK — Meter reading approximately — 12.2 volts. VARIABLE c.
  • Page 133 et the Trigger Function switch to EXT-AC or DC (nc trigger signal connected). Connect a jumper lead (#18 01 #20 solid wire) between terminals 1 and 13 of the PRO ­ GRAM connector (see Fig. 6-32) and connect a 20 k Ω , '/ 2 watt resistor between terminals 14 and 22.
  • Page 134 2. Disconnect all test equipment. This completes the calibration procedure for the Type 3B5. If the instrument has been completely checked and calibrated to the tolerances given in this procedure, it will meet the electrical characteristics listed in the Performance Require ­...
  • Page 135 binding head brass internal length or long binding head steel met. metal cap. capacitor mtg hdw mounting hardware ceramic outside diameter comp composition oval head brass conn connector oval head steel cathode-ray tube part of countersunk pan head brass double end pan head steel diameter piste...
  • Page 136 If a part you have ordered has been replaced with a new or improved part, your local Tektronix, Inc. Field Office or representative will contact you concerning any change in part number.
  • Page 137 SEC ION ELEC RICAL PAR S LIS Values are fixed unless marked Variable. Neon 5AB-B 150-0055-00 150-0055-00 Neon 5AB-B Neon 5AB-B 150-0055-00 B905 150-0049-00 Incandescent #6835 Incandescent #6835 B915 150-0049-00 Incandescent #6835 B925 150-0049-00 B982 Incandescent #6835 150-0049-00 B983 150-0048-00 Incandescent #683 Incandescent #683 w/red coating B985...
  • Page 138 (Conf) C 1 37 283-0079-00 0.01 μF 250 V C 1 38 283-0079-00 0.01 μF 250 V C 1 39 283-0059-00 1 μF 25 V +80% — 20% C 1 46 283-0081-00 0.1 μF 25 V +80% — 20% C 1 51 281-0549-00 68 pF 500 V...
  • Page 139 (Conf) Ckt. No. Part No. Descriptio n /N Range C547 281-0092-00 9-35 pF 100-122 281-0093-00 C547 5.5-18 pF 123-up C551 281-0092-00 9-35 pF 100-172 C551 281-0093-00 5.5-18 pF 173-up C567 281-0538-00 1 p F 500 V C572 283-0079-00 0.01 μF 250 V C931 283-0057-00...
  • Page 140 iConf) *152-0061-00 ilicon D 1 56 D 1 62 152-0246-00 ilicon Low Leakage 0.25 W, 40 V D 1 65 *152-0075-00 Germanium D 1 72 *152-0075-00 Germanium D 1 73 152-0166-00 Zener 1N753A 0.4W, 6.2 V, 5% D 1 83 *152-0061-00 ilicon D202...
  • Page 141 (Cont) D318 152-0246-00 ilicon Low Leakage 0.25 W, 40 V D319 152-0246-00 ilicon Low Leakage 0.25 W, 40 V D322 *152-0075-00 Germanium D323 *152-0075-00 Germanium D324 *152-0075-00 Germanium D327 152-0246-00 ilicon Low Leakage 0.25 W, 40 V D328 152-0246-00 ilicon Low Leakage 0.25 W, 40 V D329...
  • Page 142 (Cont) D485 *152-0107-00 ilicon Replaceable by 1N647 D486 *152-0107-00 ilicon Replaceable by 1N647 D487 *152-0107-00 ilicon Replaceable by 1N647 D489 *152-0107-00 ilicon Replaceable by 1N647 D491 ♦152-0107-00 ilicon Replaceable by 1N647 D492 ♦152-0107-00 ilicon Replaceable by 1N647 D493 *152-0107-00 ilicon Replaceable by 1N647 D494 *152-0107-00...
  • Page 143 (Cont) K310-1 260-0552-00 Reed K311 *108-0358-00 Coil, Reed (typical resistance 900 Ω ) K311-1 260-0552-00 Reed K312 *108-0358-00 Coil, Reed (typical resistance 900 Ω ) K312-1 260-0552-00 Reed K313 *108-0358-00 Coil, Reed (typical resistance 900 Ω) K313-1 260-0552-00 Reed K314 *108-0358-00 Coil, Reed (typical resistance 900 Ω...
  • Page 144 \Cont) Q214 151-0179-00 ilicon 2N 3 877A Q224 151-0179-00 ilicon 2N 3 877A Q235 151-0162-00 ilicon 2N 3 324 Q245 151-0162-00 ilicon 2N 3 324 Q253 151-0162-00 ilicon 2N 3 324 Q264 *151-0124-00 ilicon elected from 2N3119 Q273 *151-0121-00 ilicon elected from 2N3118 Q285 151-0162-00...
  • Page 145 (Cont) Tektronix Ckt. No. Part No. D escriptio n /N Range 315-0470-00 47 Ω ¼ W R25A 1 | 1 M Ω 311-0623-00 R25B 1 M Ω 315-0302-00 3 k Ω ¼ W 315-0104-00 100 k Ω ¼ W 315-0105-00 1 M Ω...
  • Page 146 R131 315-0101-00 100 Ω ¼ W R133 303-0243-00 24 k Ω R137 315-0470-00 47 Ω ¼ W 315-0470-00 47 Ω R138 ¼ W R143 315-0621-00 620 Ω ¼ W R145 315-0910-00 91 Ω ¼ W R1 46 315-0101-00 100 Ω ¼...
  • Page 147 (Cont) R232 315-0273-00 27 k ¼ W R233 315-0122-00 1.2 k Ω ¼ W 315-0223-00 R235 22 k Ω ¼ W 315-0112-00 1.1 k Ω R236 ¼ W 301-0303-00 R237 30 k Ω 1/2 W R239 315-0223-00 22 k Ω ¼...
  • Page 148 (Cont) Tektronix Ckt. No. Part No. Description /N Range R333 311-0405-00 10 k Ω R335 301-0433-00 43 k Ω 1/2 W R336 321-0356-00 49.9 k Ω 1/8 W Prec R337 323-0367-00 64.9 k Ω 1/2 W Prec R340 321-0431-00 301 k Ω...
  • Page 149 (Cont) R505 311-0606-00 500 k Ω R506 315-0224-00 220 k Ω ¼ W R507 315-0122-00 1.2 k Ω ¼ W R508 311-0607-00 10 k Ω R509 321-0274-00 6.98 k Ω 1/8 W Prec R514 301-0473-00 47 k Ω 1/2 W R515 311-0629-00 3 k Ω...
  • Page 150 (Conf) R942 2.2 k Ω 315-0222-00 ¼ W R943 4.7 k Ω 315-0472-00 ¼ W R949 315-0222-00 2.2 k Ω ¼ W R992 301-0101-00 100 Ω 1/2 W R993 301-0101-00 100 Ω 1/2 W R994 301-0101-00 100 Ω 1/2 W 260-0495-00 L ever Trigger Function...
  • Page 151 (ContJ (Cont) C629 283-0026-00 0.2 μF 25 V C632 283-0026-00 0.2 μF 25 V C636 281-0523-00 100 pF 350 V 283-0059-00 C638 1 μF 25 V +80%-20% C655 283-0026-00 0.2 μF 25 V C657 281-0504-00 10 pF 500 V C662 290-0136-00 2.2 μF 20 V...
  • Page 152 (C o nt) Ckt. D468 *152-0075-00 Germanium D469 *152-0075-00 Germanium D470 *152-0075-00 Germanium D471 *152-0075-00 Germanium D472 *152-0075-00 Germanium D473 *152-0107-00 ilicon Rep l a ceable by 1N647 *152-0075-00 Germanium D475 D476 *152-0075-00 Germanium D478 *152-0075-00 Germanium D479 *152-0075-00 Germanium D481 *152-0075-00 Germanium...
  • Page 153 (Cont) Description Q423 151-0188-00 ilicon 2N3906 Q443 151-0188-00 ilicon 2N3906 Q453 151-0188-00 ilicon 2N3906 Q473 151-0188-00 ilicon 2N3906 Q604 151-0188-00 ilicon 2N3906 Q615 151-0188-00 ilicon 2N3906 Q625 151-0188-00 ilicon 2N3906 Q634 *151-0155-00 ilicon Replaceable by 2N2925 Q643 *151-0155-00 ilicon Replaceable by 2N2925 Q653 151-0080-00 ilicon...
  • Page 154 (Conf) (Cont) R604 315-0222-00 2.2 k Ω ¼ W R611 315-0273-00 27 k Ω ¼ W R612 315-0224-00 220 k Ω ¼ W R614 315-0104-00 100 k Ω ¼ W R616 315-0105-00 1 M Ω ¼ W R625 315-0242-00 2.4 k Ω ¼...
  • Page 155 (Cont) T660 * 1 20-0454-00 Toroid, 7 turns, bifi l ar *670-0108-00 Complete Card Tolerance ±20% unless otherwise indicated. C704 283-0026-00 0.2 μF 25 V C709 25 V 283-0026-00 0.2 μF C714 283-0026-00 0.2 μF 25 V C719 283-0026-00 0.2 μF 25 V C724 25 V...
  • Page 156 (Cont) 'Cont) D735 *152-0075-00 Germanium Tek pec D751 *152-0075-00 Germanium Tek pec D752 *152-0075-00 Germanium Tek pec D753 *152-0075-00 Germanium Tek pec D754 *152-0075-00 Tek pec Germanium D755 *152-0075-00 Germanium Tek pec *152-0075-00 Tek pec D756 Germanium Tek pec D761 *152-0075-00 Germanium D762...
  • Page 157 (Cont) (Conf) D875 *152-0075-00 Germanium D876 *152-0075-00 Germanium D881 *152-0075-00 Germanium D882 *152-0075-00 Germanium D883 *152-0075-00 Germanium D884 *152-0075-00 Germanium D885 *152-0075-00 Germanium D886 *152-0075-00 Germanium Q705 *151-0183-00 ilicon elected from 2N2192 Q715 *151-0183-00 ilicon elected from 2N2192 Q725 *151-0183-00 ilicon elected from 2N2192 Q755...
  • Page 158 (Conf) (Cont) R723 315-0222-00 2.2 k Ω ¼ W R724 315-0104-00 100 k Ω ¼ W R725 315-0222-00 2.2 k Ω ¼ W R727 315-0103-00 10 k Ω ¼ W R731 315-0222-00 2.2 k Ω ¼ W R732 315-0103-00 10 k Ω ¼...
  • Page 159 (Conf) (Cont) 315-0222-00 R861 2.2 k Ω ¼ W R862 315-0222-00 2.2 k Ω ¼ W 315-0222-00 2.2 k Ω R863 ¼ W R864 315-0104-00 100 k Ω ¼ W R865 315-0222-00 2.2 k Ω ¼ W R871 315-0222-00 2.2 k Ω ¼...
  • Page 161 Indented items are part of, and included with, the next higher indentation. Replacement parts are available from or through your local Tektronix, Inc. Field Office or representative. Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available, and to give you the benefit of the latest circuit improvements developed in our engineering department.
  • Page 163 SEC ION 8 MECHANICAL PAR S LIS Fig. & Index Tektronix erial/Model No. Part No. Disc 333-0923-01 12299 PANEL, front 333-0737-02 13000 PANEL, front 366-0208-00 KNOB, charcoal — MANUAL TIME/DIV knob includes: 213-0004-00 CREW, set, 6-32 x 3 / M inch, H 366-0081-00 KNOB, red —...
  • Page 164 (cont) Index Tektronix erial/Model Description Part No. Disc 1-25 366-0347-00 KNOB, charcoal — LEVEL knob includes: 213-0022-00 CREW, set, 4-40x 3 / 1<s inch, H 366-0349-00 KNOB, red — LOPE knob includes: 213-0076-00 CREW, set, 2-56 x % inch, H...
  • Page 165 (cont) 1-51 352-0064-00 HOLDER, neon, double mounting hardware: (not included w/holder) 7 / 8 211-0109-00 CREW, 4-40 inch, FH 210-0406-00 NUT, hex., 4-40 x 3 / 14 inch 378-0541-00 FILTER, lens, neon, clear 366-0341-00 KNOB, charcoal — PO ITION knob includes: 213-0076-00 CREW, set, 2-56 x ’...
  • Page 166 Fig. & 407-0231-00 BRACKET, angle mounting hardware: (not included w/bracket) 211-0097-00 CREW, 4-40 inch, PH 211-0101-00 CREW, 4-40 x 5 / u inch, 100° csk, FH 210-0586-00 NUT, keps, 4-40 x'/ 4 inch RE I TOR, variable mounting hardware for each: (not included w/resistor) 210-0940-00 WA HER, flat, ’...
  • Page 167 (cont) 2-28 RE I TOR, variable mounting hardware: (not included w/resistor) 210-0940-00 WA HER, flat, '/ 4 ID x % inch OD 210-0583-00 NUT, hex., ’ Zi-32 x s / w inch 376-0050-00 EMBLY, coupling, flexible assembly includes: 354-0251-00 RING, 3 / s diameter x 0.172 inch long 376-0046-00 COUPLING, plastic 213-0022-00...
  • Page 168 (cont) 2-54 351-0037-00 GUIDE, shoe, plug-in mourting hardware: (not included w/guide) 211-0013-00 CREW, 4-40 x % inch, RH 210-0586-00 NUT, keps, 4-40 x ’ / 4 inch 670-0106-00 EMBLY, circuit board — TIME BA E assembly includes: 136-0220-00 CCKET, transistor, 3 pin CCKET, transistor, 3 pin 136-0183-00 136-0061-00...
  • Page 169 SEC ION 9 DIAGRAMS The following symbols are used on the diagrams: crewdriver adjustment Front-, side- or rear-panel control or connector Clockwise control rotation in direction of arrow Refer to indicated diagram Connection to circuit board made with pin connector at indicated pin Connection soldered to circuit board Blue line encloses components located on circuit board...
  • Page 170 Input impedance (with 10 Megohms, 7.5 Mode probe) picofarads PO ITION Midrange Probe ground Type 3B5 chassis ground DLY'D WP MAG Trigger ource External from pin BH of DELAY 1.00 the Time-Base board to indicate true time re ­...
  • Page 171 Q 374 CIRCUIT Q 43 Q344 0265 Q293 AUTO TRIGGER ADVANCE • Q7B5 BLOCK DIAGRAM...
  • Page 172 VOLTAGE i WAVEFORM CONDITION 0 23 330 pF ¥ - 1~~ WEEP TRIGGER O...
  • Page 173 Zms/Dlv RK5-IO. 4125V — Q25S XIOO MAGNIFICATION -10.5 ~rri WEEP GENERATOR <z> TYPE. PLUG...
  • Page 174 — DELAY £ TIMING CIRCUIT<§>...
  • Page 175 ' — \JF <$> HORIZONTAL AMPLIFIER^/...
  • Page 176 READOUT...
  • Page 177 -tZJLV <Q> <Q> bt>b CIRCUIT^ TYPE PLUG-IN...
  • Page 178 '» (•) COUNTELR CIRCUIT^...
  • Page 179 “ 12.2V <$> " A !!£. L e v POW “ <$><$> <$><&<?> 2.2K Q92S 12.2V -12.2V OPERATING MODE POWER <§> TYPE PLUG-IN...
  • Page 180 & & o & xz xz 'CO' ®*< + I2 V xz xz 'S'l 'Z' 1 I'v' WEEP TO 12. EV AMPLIFIER UNIT - 12.2V -IOOV -IOOV INTERCONNECTING DIAGRAM^ TYPE PLUG-IN...
  • Page 182 READOUT BOARD <§>...
  • Page 183 <■ KK 2 - * «- <- <s> <■ < > <s> BOARD VOLTAGE. DI TRIBUTION <n>...