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Tektronix 1S1 Instruction Manual

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INSTRUCTION
MANUAL
TYPE
1S1
SAMPLING UNIT
M A N U F A C T U R E R S O F C A T H O D E - R A Y O S C I L L O S C O P E S

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Summary of Contents for Tektronix 1S1

  • Page 1 INSTRUCTION MANUAL TYPE SAMPLING UNIT M A N U F A C T U R E R S O F C A T H O D E - R A Y O S C I L L O S C O P E S...
  • Page 2 Serial Number ______________ TYPE SAMPLING UNIT Tektronix, Inc. S . W . M i l l i k a n W a y P . O . B o x 5 0 0 B e a v e r t o n , O r e g o n 9 7 0 0 5...
  • Page 3 Type 1S1...
  • Page 4 Type 1S1...
  • Page 5 Type 1S1 Sampling Unit Type 1S1...

  • Page 6: General Description

    Type 1S1 for viewing low-frequency signals. In this type repetition rates) from dc to 1 Gc or more. of operation, the input signal is sampled by the Type 1S1, and the display oscilloscope real-time sweep and triggering Maximum Signal Input Voltage are utilized.
  • Page 7 Characteristics – Type 1S1 Smoothing Control Range place about the left edge of the screen. Using the magnifier, the fastest calibrated sweep rate is 100 psec/cm. At least 3:1 reduction of display noise (compared to noise An uncalibrated Time/Cm VARIABLE control provides...

  • Page 8: Power Supply

    Characteristics – Type 1S1 Triggering Source 5 nsec or less on a 10-Mc sine wave of 50-mv amplitude for internal triggering or 8-mv amplitude for external trigger- ing. Internal from trigger takeoff at input of vertical channel, or external from front-panel 50-ohm EXT TRIG input con- 0.7 µsec or less on a 100-kc sine wave of 50-mv ampli-...
  • Page 9 NOTES...

  • Page 10: Front Panel Controls

    CAL position and VERT GAIN ad- loose. Pull the Type 1S1 part of the way out of the compart- justment is set correctly. ment with the knob, then take hold of the unit by the corner...
  • Page 11 Operating Instructions – Type 1S1 Fig. 2- 1. Front panel controls and connectors.
  • Page 12 Operating Instructions – Type 1S1 10 k ohms. Measurement of offset voltage slope of triggering signal. Disconnects should be made with high-impedance de- triggering signal and permits free run op- vice. eration of triggering circuit when switch is set to FREE RUN position.

  • Page 13: Manual Scan

    The first 18 steps of the following procedure describe cm to many thousands of samples/cm setting up the crt display when using a Type 1S1 and a dis- In counterclockwise detent position (SWEEP play oscilloscope. These steps may be used in installing a OFF), dot is displayed on crt screen and Type 1S1.
  • Page 14 12. Remove the patch cord from the Type 1S1 HORIZ clockwise. (It may be necessary to increase the intensity OUTPUT jack and connect it between the oscilloscope Cali- to view the triggered display.)
  • Page 15 Type 1S1 TIME/CM switch still determines the equivalent-time sweep 23. Turn the SAMPLES/CM control through its range of rate of the display.

  • Page 16: Operational Adjustments

    Allow at 63. Set the mVOLTS/CM switch to 2. least 20 minutes warm up of the Type 1S1 before making any 64. With the DC OFFSET control, position the tip of the of these adjustments.
  • Page 17 Fig. 2-4. Operational adjustment controls on the left side of the Type 1S1...

  • Page 18: Vertical Gain Adjustment

    The use of a 50-ohm amplitude calibrator, as described in In the Type 1S1, loop gain is adjusted to unity with the the calibration procedure in Section 5, is recommended for SMOOTHING control set to the fully clockwise NORM posi- this adjustment.

  • Page 19: Coax Cables

    Thus, when a signal is applied to the Type 1S1 SIGNAL IN connector, if the source impedance of the signal is not 50 ohms, a suitable impedance-matching device must be pro- vided.
  • Page 20 = 96.8 ohms − For relatively high-impedance measurements of nanosec- ond signals, special passive or cathode-follower signal probes are available for use with the Type 1S1 Sampling Unit. Pas- and R = 64.6 ohms − sive probes may also be built into or onto the circuits to be monitored, to minimize changes in loading.
  • Page 21 50 its operation. It must be able to carry a given energy level, ohm input cable to the Type 1S1, placing R + 50 ohms be mechanically adaptable to the measured circuit, and be across the impedance in the circuit.

  • Page 22: Triggering Sources

    200 ohms. At higher time domain of the Type 1S1 TIME POSITION controls, and source impedances, circuit loading would require more than avoids the readjustment of triggering controls when a series 20% correction.
  • Page 23 Probes. For many applications, a trigger probe can be ternal sine-wave triggering requires an amplitude of 8mv used to trigger the Type 1S1 if a signal that is time-related or more, peak to peak. Maximum amplitude of the input to the input signal can be taken from the device under triggering signal applied to the EXT TRIG input connector test.
  • Page 24 VP-1/P6035/Coupling Cap./Adapter ..…. 800mv-40v T-Connector/50 coax (GR)/Adapter 16mv-400mv Coax (GR)/adapter …………………. 8mv-200mv Tektronix Part Numbers of Suggested Connecting Devices CT-3 Current Takeoff 017-0060-00 VPA Voltage Pickoff 017-0073-00 2-nsec Coax Cable (GR) 017-0505-00 5-nsec Coax Cable (GR) 017-0502-00 10-nsec Coax Cable (GR)
  • Page 25 The setting signal to the Type 1S1. The time relationship between the of the switch determines whether the posi-...
  • Page 26 Operating Instructions – Type 1S1 Normally a zero triggering level is obtained with the to being connected to the trigger circuit. In this case, nega- TRIGGER SENSITIVITY control set 45° clockwise from the tive-going pulse signals are changed to positive-going sig- midrange (straight up) position.
  • Page 27 Operating Instructions – Type 1S1 mum holdoff of the trigger circuit (for a given setting of the be triggered in synchronization with the signal. Thus syn- TIME POSITION RANGE switch) occurs with the RECOVERY chronized triggering is possible with the TRIGGER SENSI- TIME control set fully counterclockwise (but not switched to TIVITY control set in its free run region (45°...

  • Page 28: Operating Information

    10cps to 100kc (and up to 1 Gc). Since the display produced by the Type 1S1 is made up of Check that the TRIGGER SENSITIVITY and samples taken from different cycles of the input waveform,...
  • Page 29 Operating Instructions – Type 1S1 means that the number of samples taken per unit equivalent Use of DC Offset time is increased by the magnification factor. When the dis- play is magnified, expansion occurs about the left edge of The front-panel DC OFFSET control may be used for can- the crt screen, regardless of the TIME POSITION control celling the effect of a dc voltage (up to ±1 volt) in the pres-...
  • Page 30 In the Type 1S1, this type of display is rarely obtained because of the continuously variable selection of sampling dot density with the SAMPLES/CM control. A false display can be detected by merely changing the dot density.

  • Page 31: General Information

    If sweep rates are needed below the slowest equivalent- time rate provided by the Type 1S1 TIME/CM switch, the Type 1S1 and the oscilloscope may be operated in such a way as to produce "real-time" sampling displays. Real-time sampling is a method of operation in which the samples are...

  • Page 32: Trigger Source

    50 ohms. Another advantage passive sampling probes cannot be used above this voltage of real-time sampling with the Type 1S1 is that the passive level, and ac-coupling of the probes does not pass signals at probes may be conveniently extended from the oscilloscope these frequencies.

  • Page 33: Voltage Measurements

    SIGNAL IN connector of the The instantaneous (dc) voltage of a displayed waveform Type 1S1. The amount of displacement for any given voltage is measured from some voltage reference level such as may be selected with the mVOLTS/CM switch. To provide chassis ground.

  • Page 34: Time Interval Measurement

    Do not readjust the triggering controls until ed with the Type 1S1 TIME/CM switch. Set the sweep rate after the time comparison measurement has been made. so the portion of the waveform containing the points of interest is spread over several cm of the graticule.

  • Page 35: Frequency Measurement

    Operating Instructions – Type 1S1 6. Measure the horizontal distance between the point of For example, if the horizontal distance between the 10% interest on the second waveform and the vertical reference and 90% points is 4.8 cm (see Fig. 2-21), and the sweep rate line obtained with the first waveform.

  • Page 36: Phase Measurement

    Operating Instructions – Type 1S1 1. Set the Type 1S1 TIME/CM switch to display several The relative amplitude of the signals does not affect the cycles of the waveform on the crt screen. Be sure the phase measurement as long as each signal is vertically cen- Time/Cm VARIABLE control is in CAL (detent) position.

  • Page 37: Basic Precautions

    Certain precautions should always be observed when − ρ connecting a pulse signal to a test device or to the Type 1S1: 1. Use high-quality coax cables and connectors for all The load impedance can thus be calculated from the signal connections.

  • Page 38: Equivalent-Time Sampling

    The basic equivalent-time sampling The cycle starts when the trigger circuit recognizes an process is discussed first, then the circuitry of the Type 1S1 excursion of the triggering signal and unclamps the fast ramp is analyzed in more detail. Refer to the block diagram in generator which produces a rundown voltage to be com- Fig.

  • Page 39: Circuit Analysis

    In this way the sampling event is delayed by suc- The vertical system of the Type 1S1 uses a balanced-bridge cessively longer intervals and the samples are taken suc-...
  • Page 40 Circuit Description – Type 1S1 Fig.3-3. A single sample signal traced through the feedback loop (see text). circuit are applied to the sampling gate, strobing the gate A portion of the memory output signal is also sent back into conduction for a brief period, during which the input through a positive feedback loop to the sampling bridge.
  • Page 41 The SIGNAL IN connector on the front panel of the Type ple-pulse amplifiers must be varied in opposite directions. 1S1 is a 50-ohm GR Type 874 connector that assures rela- These two functions are performed simultaneously by the tively uniform input characteristics up to 1 Gc and provides action of the two attenuators operated by the front-panel a quick-mate input system.

  • Page 42: Delay Line

    30% of the difference signal is able to pass through the are special gallium arsenide diodes with very fast switching sampling gate, the Type 1S1 is said to have a sampling characteristics. Between sampling events, the sampling gate efficiency of 30%.
  • Page 43 Circuit Description – Type 1S1 Sampler Preamplifier As D90 is momentarily reverse biased by the negative-go- ing pulse from the blocking oscillator, current which had been passing through D90 is switched to D92. This causes The sampled pulse from the sampling gate is sent through...

  • Page 44: Memory Circuit

    Circuit Description – Type 1S1 Fig. 3-5. Block diagram of the Memory circuit. Memory Circuit and will add or subtract the new signal from the residual charge, depending on whether the new level is above or below the previous one. Since grid current in V44B is very...

  • Page 45: Horizontal System

    The sweep-gating mul- tivibrator is then ready to permit a new staircase to start when the next sweep-unlock and staircase-advance pulses The horizontal system of the Type 1S1 provides the hori- are received. zontal deflection voltage for the display oscilloscope and...

  • Page 46: Trigger Circuit

    Circuit Description – Type 1S1 Fig. 3-6. Block diagram of the Trigger circuit. feedback from the staircase generator to the staircase in- or by connecting the signal through inverting transformer verter still determines the horizontal position of the crt beam T410 (with the switch at one of the - positions).

  • Page 47: Trigger Holdoff

    Circuit Description – Type 1S1 control tunnel diode D449. The front-panel TRIGGER SEN- triggered until it has reached the proper bias level. As SITIVITY control sets the sensitivity of the trigger recognition the bias on D449 reaches the triggerable level, the first of...
  • Page 48 Circuit Description – Type 1S1 rent path through Q485 is open. With D472 reverse biased erator is connected to the staircase inverter to be used as and D482 conducting, the holdoff capacitors begins the a comparison voltage for controlling the amount of sampling runup portion of the holdoff cycle, charging toward the delay with respect to the triggering event.
  • Page 49 Circuit Description – Type 1S1 MAGNIFIER knob clockwise) depend on the starting position and D315 to conduct again. The timing capacitors quickly of the switch and are determined by the particular com- discharge, making the circuit ready for its next rundown.
  • Page 50 Circuit Description – Type 1S1 Fig. 3-8. Block diagram of the Staircase circuit. transistors turned off during the retrace. Near the end applied to the retrace blanking amplifier and to the dis- of the retrace period, as the holdoff waveform (at the junc- connect diodes, D246 and D247.
  • Page 51 R270 (STAIRCASE DC LEVEL) so the the operation of T630. The secondary of T630 supplies staircase starts at zero volts. Calibration of the Type 1S1 power to the rectifier consisting of D630 and D632 which timing is adjusted to be correct when the horizontal deflec- produces an output of approximately 30 volts across C632.
  • Page 52 The -138-volt supply is connected to fixed current loads The shunt regulator consists of comparator Q614 and in the Type 1S1 which draw a total of about 25 ma of shunt transistors Q624 and Q627. Transistor Q614 compares current and set the operating level of zener diode D662.

  • Page 53: Preventive Maintenance

    Recalibration panels in place requires more frequent cleaning. If the Type 1S1 is stored on a shelf when not in use, cover it To ensure that the Type '1S1 is operating correctly and with a cloth or piece of plastic to keep dust from collecting accurately, it should be checked and recalibrated after each in the instrument.

  • Page 54: Ordering Parts

    Maintenance – Type 1S1 Tektronix, or are selected by Tektronix to meet specific Metal Terminals. When soldering to metal terminals performance requirements. Each of these special parts is such as connector jacks and switch terminals, ordinary 60/40 indicated in the Parts List by an asterisk preceding the part tin-lead solder can be used.

  • Page 55: Troubleshooting Aids

    (identifiable by their D11B and D11D supplied as a matched pair gray body color) are used in the Type 1S1. Both of these types are coded for resistance value with the EIA color- Rotary Switches. Individual parts or sections of rotary code, which is read starting with the stripe nearest the switches normally are not replaced separately.
  • Page 56 Maintenance – Type 1S1 Fig. 4-2. Basic test points used for troubleshooting the Type 1S1. (A) Horizontal system on the right side of the unit; (B) vertical system on left side of unit.
  • Page 57 This is normal and Voltage measurements should be made with a 20,000 ohms/ should not be confused with trouble in the Type 1S1. It is volt dc voltmeter, accurate to within 3% on all ranges.
  • Page 58 A dynamic tester such as a Tektronix Type Capacitors. A leaky or shorted capacitor can be de- 575 (for transistors) or Type 570 (for tubes) Curve-Tracer tected by checking it with an ohmmeter set to a high scale.
  • Page 59 Maintenance – Type 1S1 Fig. 4-3. Circuit component locations and wiring color-code on etched-wiring REGULATOR BOARD: (A) front side;(B) reverse side...
  • Page 60 Maintenance – Type 1S1 Fig. 4-4A. Circuit component locations on VERTICAL etched-wiring board: (#1) Front side; (#2)reverse side.
  • Page 61 Maintenance – Type 1S1 Fig. 4-4B. Wiring color code on VERTICAL etched-wiring board.
  • Page 62 Maintenance – Type 1S1 Fig. 4-5A. Circuit component locations on front side of HORIZONTAL etched-wiring board. 4-10...
  • Page 63 Maintenance – Type 1S1 Fig. 4-5B. Wiring color code on HORIZONTAL etched-wiring board. 4-11...

  • Page 64: Equipment Required

    µsec; sine-wave outputs of 5Mc, 10Mc and 50Mc; fre- A complete calibration and verification procedure for quency accuracy within 0.25%; marker and sine-wave am- the Type 1S1 is provided in this section. This procedure plitudes at least 400mv into 50 ohms. checks the instrument to the performance characteristics given in Section 1.
  • Page 65 Calibration – Type 1S1 Fig. 5-1. Recommended calibration equipment.
  • Page 66 20. Four 10X T-attenuators with GR 50-ohm connectors. 30. Clip-lead adapter with BNC jack connector. Required Tektronix part number 017-00"-00. only for checking input dc resistance. Tektronix part num- 21. Two 5X T-attenuators with GR 50-ohm connectors. ber 013-0076-00. Tektronix part number 017-0045-00.

  • Page 67: Vertical Adjustments

    Unity loop gain with SMOOTHING control clockwise; cedure. 2mm baseline shift with polarity reversal. Type 1S1 Serial No. ___________________ 19. Adjust Bridge Standoff (Page 5-29) Calibration Date ______________________ +2 volts using a 20-nsec pulse.

  • Page 68: Horizontal Checks

    The following procedure is arranged in a sequence that Correct timing within 1% at 5 µsec; allows the Type 1S1 to be calibrated with a minimum of Correct 1-2-5 ratio within 1% on 5 µS ramp; adjustment interaction. Each step contains complete in- Correct timing within 1% using magnifiers (from .5...
  • Page 69 Calibration – Type 1S1 6. Turn on the autotransformer, the indicator oscilloscope 8. Allow at least 20 minutes for the Type 1S1 to warm and the other instruments (not the tunnel diode pulse gen- up before making any calibration checks or adjustments.

  • Page 70: Power Supplies

    Adjust R625 (+19V CAL) if the reading is not correct. Turns sweep. oscilloscope without front-panel Stability con- trol is used, turn sweep off by setting it for single sweep operation. Fig. 5-4. Voltage test points and adjustment controls on bottom side of Type 1S1.
  • Page 71 125 volts). e. Check the display for less than 1 cm (10 mv) of ripple on the Type 1S1 -19-volt regulated supply (see Fig. 5-6). f. Remove the cathode follower probe (or loading resistor) from the Type 1S1 PROBE POWER connector.
  • Page 72 Calibration – Type 1S1 NOTES...
  • Page 73 Calibration – Type 1S1 Fig. 5-7. Initial test setup for steps 4 through 7. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Preset) mVolts/Cm VARIABLE Horizontal Display Ext X1 or Ext X10 VERT POSITION Centered Intensity Counterclockwise...
  • Page 74 Test equipment setup is shown in Fig. 5-7. b. Leave the Type 1S1 turned upside down. c. Connect a patch cord from the Type 1S1 HORIZ OUT- PUT jack to the Ext Horiz Input jack of the indicator oscil- loscope.
  • Page 75 Calibration – Type 1S1 Fig. 5-10. Trigger circuit adjustments on right side of Type 1S1. (Unit is positioned upside-down on test bench). Fig. 5-11. Staircase and inverter adjustments on right side of Type 1S1. (Unit is positioned upside-down on test bench.) 5-12...

  • Page 76: Single Sweep

    R380 (INVERTER DC ZERO). 6. Adjust Staircase DC Level f. Trigger the test oscilloscope. a. Reset the following Type 1S1 controls: g. Check for a dc level of zero volts at the bottom of DISPLAY MODE SINGLE SWEEP the main portion of the waveform (see Fig.

  • Page 77: Display Mode

    Calibration – Type 1S1 Fig. 5-14. Initial test equipment setup for steps B through 10. TYPE 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Preset) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal brightness of...
  • Page 78 Coupling (Channel 8. Adjust Timing Cal Before checking the timing of the Type 1S1, the indicator oscilloscope external horizontal deflection factor must be set to 1 volt/cm ±1%. Any accurate voltage source (±0.5%), either a signal or a dc voltage, may be used for setting this adjustment.
  • Page 79 Set the time-mark generator for a 5-µsec output signal. w. Set the Type 1S1 TIME/CM switch to 5 µSEC. The indicator oscilloscope Intensity control may require read- justment for this slower ramp.
  • Page 80 Calibration – Type 1S1 Fig. 5-18. Fast ramp and comparator adjustments on right side of Type 1S1 (unit is positioned upside-down on test bench). d. Set the indicator oscilloscope Intensity control for a f. Adjust the Type 1S1 MANUAL SCAN control to posi- dim trace.
  • Page 81 (see Fig. 5-20). g. Check the timing of the 50 nS fast ramp over the center Fig. 5-21. Bottom side of Type 1S1 showing location of C325. 8 cm of the graticule. Exactly two complete cycles of the waveform should traverse the 8.0 cm :±--0.08 cm.

  • Page 82: Recovery Time

    Calibration – Type 1S1 Fig. 5-22. Initial test equipment setup for steps 11 through 13. Type 1S1 TIME/CM 10 nSEC mVOLTS/CM Time/Cm VARIABLE mVolts/Cm VARIABLE TRIGGER SOURCE INT - VERT POSITION Centered TRIGGER SENSITIVITY Centered DC OFFSET Centered RECOVERY TIME...
  • Page 83 OUTPUT jack. b. Check that the length of the sweep is between 10.0 cm and 10.3 cm. Fig. 5-24. Right side of Type 1S1 showing location of DELAY ZERO and SWEEP LENGTH controls. (Unit is positioned upside-down on test bench.) 5-20...
  • Page 84 Turn on the indicator oscilloscope and allow about 5 minutes for warm up before continuing the procedure. (If the Type 1S1 was allowed to cool for very long, let it warm up k. Secure the Type 1S1 in the indicator oscilloscope with for 20 minutes before proceeding.)
  • Page 85 Calibration – Type 1S1 Fig. 5-26. Initial test equipment setup for steps 14 through 17. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Preset) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal Brightness...
  • Page 86 See Fig. 5-27 for the location of R30. move vertically more than about 0.5 cm as the SMOOTH- ING control is turned. Fig. 5-27. Location of balance adjustment controls on left side of Type 1S1. (Unit is installed in indicator oscilloscope.) 5-23...
  • Page 87 Calibration – Type 1S1 c. Recheck the OFFSET OUTPUT for zero volts on the test oscilloscope crt screen and adjust the Type 1S1 DC OFFSET control if the voltage is not correct. d. Set the Type 1S1 mVOLTS/CM switch to 50.
  • Page 88 Calibration – Type 1S1 NOTES 5-25...

  • Page 89: Single Sweep

    Calibration – Type 1S1 Fig. 5-29. Initial test equipment setup for steps 18 through 20 Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Pre- set) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Amplitude Calibrator...
  • Page 90 Test equipment setup is shown in Fig. 5-29. b. Connect the tip of the test probe to the Type 1S1 HORIZ OUTPUT jack. c. Trigger the test oscilloscope display.
  • Page 91 Set the pretrigger pulse generator Output Polarity switch to - x. Set the Type 1S1 TRIGGER SOURCE switch to INT- y. Check for a waveform indicating unity loop gain. The 2-trace separation should not change by more than 0.2 cm, as compared to the display with +polarity.
  • Page 92 Calibration – Type 1S1 Fig. 5-33. Adjustments on left side of Type 1S1 for loop gain, bridge standoff and risetime. 19. Adjust Bridge Standoff j. Check the test oscilloscope waveform for an amplitude of 2 volts or more (4 cm or more).
  • Page 93 Calibration – Type 1S1 q. Remove the test probe. r. Set the pretrigger pulse generator Output Polarity switch to +. s. Leave the Type 1S1 TRIGGER SOURCE switch set to INT-. 20. Adjust Risetime a. Disconnect the pretrigger pulse generator signal from the Type 1S1 SIGNAL IN connector, but leave the connec- tions and controls set as in step 17.
  • Page 94 Fig. 5-35B. through 18 v. (Use a 5X attenuator and the variable attenuator.) j. Check the risetime of the Type 1S1 as indicated in the display. Risetime should be 350 psec or less (but not less NOTE than 330 psec).

  • Page 95: Recovery Time

    Calibration – Type 1S1 Fig. 5-36 initial test equipment setup for steps 21 through 23 Type 1S1 TIME/CM 5µSEC mVOLTS/CM Time/Cm VARIABLE mVolts/Cm VARIABLE TRIGGER SOURCE EXT + VERT POSITION Centered TRIGGER SENSITIVITY Clockwise DC OFFSET Centered RECOVERY TIME Centered...

  • Page 96: Vertical Checks

    Type 1S1 SIGNAL IN and EXT TRIG connectors, c. Set the amplitude calibrator Volts switch to the .12 b. Set the Type 1S1 mVOLTS/CM switch to each position position. from 100 to 2 and check the attenuator accuracy as indi- cated in Table 5-1.
  • Page 97 Calibration – Type 1S1 Fig. 5-39. Initial test equipment setup for steps 24 through 26. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Pre- set) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal Brightness...
  • Page 98 Check that the top of the waveform is within 0.3 cm of the horizontal centerline. (See Fig. 5-40C). This indicates an amplitude of 600 mv (±3%) at the Type 1S1 VERT OUT- Fig. 5-40. Typical test oscilloscope displays for setting up PUT jack, or 200 mv per cm of display on the screen of the vertical output accuracy measurement.

  • Page 99: Display Mode

    Check that the trace on the test oscilloscope screen is within 2.4cm of the horizontal centerline. This indi- cates a voltage excursion of 6 volts ±2% at the Type 1S1 OFFSET OUTPUT jack, or 10 times the display voltage change produced by the DC OFFSET control.
  • Page 100 Calibration – Type 1S1 2.5 cm of the horizontal centerline, indicating a dc volt- of the horizontal centerline, indicating a dc voltage of age of +67.5 volts ±2.5 volts. +67.5 volts ±2.5 volts. l. Touch the test probe to the junction of D186 and D188 n.
  • Page 101 Calibration – Type 1S1 Fig. 5-43. initial test equipment setup for steps 27 and 28. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Preset) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal Brightness...
  • Page 102 Adjust the test oscilloscope trace for a zero-volt dc Input Atten reference level. Millivolts/Cm Variable Calib (at detent) c. Touch the tip of the probe to the Type 1S1 OFFSET OUTPUT lack. Vc Range d. Adjust the Type 1S1 DC OFFSET control to position Comparison Voltage 6.000...
  • Page 103 Calibration – Type 1S1 Fig. 5-44. Initial test equipment setup for steps 29 through 32. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Pre- set) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal brightness...

  • Page 104: Trigger Source

    Perform steps 20b through 20j in the adjustment pro- cedure to check for a risetime of 350psec or less. d. Disconnect the tunnel diode pulse generator from the Type 1S1 SIGNAL IN connector and turn off the gen- erator. e. Set the mVolts/Cm VARIABLE control to CAL posi- tion.
  • Page 105 Calibration – Type 1S1 b. If step 30 was omitted, reset the Type 1S1 controls d. Adjust the square-wave output amplitude for a dis- as follows: play amplitude of 5cm. TIME/CM 5 nSEC e. Adjust the TIME POSITION control to position a ris-...
  • Page 106 Calibration – Type 1S1 NOTES 5-43...
  • Page 107 Calibration – Type 1S1 Fig. 5-47. Initial test equipment setup for steps 33 through 35. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Preset) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal Brightness...
  • Page 108 A-Vc 1S1 TIME POSITION and FINE controls. Millivolts/Cm f. Adjust the variable attenuator and the Type 1S1 VERT POSITION controls to obtain a display similar to that shown Input Atten in Fig. 5-49A. Approximately 10% of the display dots should...
  • Page 109 Check that the trace position does not move verti- cally by more than ±2cm (±4mv) during this decrease in repetition rate. f. Set the type 1S1 mVolts/CM switch to 5. g. Reposition the trace to the graticule centerline. h. With the pulse generator Range switch and Repeti-...
  • Page 110 Calibration – Type 1S1 NOTES 5-47...
  • Page 111 Calibration – Type 1S1 Fig. 5-52. Initial test equipment setup for steps 36 through 40. Type 1S1 TIME/CM 5 µSEC mVOLTS/CM Time/Cm VARIABLE mVoIts/Cm VARIABLE TRIGGER SOURCE INT + VERT POSITION Centered TRIGGER SENSITIVITY Clockwise DC OFFSET Centered RECOVERY TIME...
  • Page 112 Fig. 5-54. Typical indicator oscilloscope displays for checking 1-2-5 timing ratio with a 5 Mc sine wave. d. Trigger the display with the Type 1S1 TRIGGER SEN- SITIVITY control. e. Adjust the variable attenuator to produce approxi- mately 2cm of vertical deflection.
  • Page 113 (step 8). (If the adjustment procedure was not performed, check the horizontal deflection factor adjustment as de- scribed in steps 8 c through 8 l.) h. Set the Type 1S1 TIME/CM switch to .5µSEC. i. Set the time-mark generator for a 5-Mc sine-wave output.
  • Page 114 Fast Ramp Timing Optional Timing Checks n. Set the Type 1S1 TIME/CM switch to each position given in Table 5-3 and apply the indicated timing signal. The preceding steps have checked all sweep rates to with- in 3% accuracy;...
  • Page 115 Calibration – Type 1S1 as indicated in Table 5-5. Apply the timing signal from the c. Set the Type 1S1 DISPLAY MODE switch to SINGLE time-mark generator or 1-Gc oscillator and check timing SWEEP. After completion of the sweep, the trace will be held over the center 8cm for accuracy within 3% (±0.24cm)
  • Page 116 Check that the displayed dot remains nearly stationary hold off the sweep generator. on the crt screen. l. Position the trace on the screen with Type 1S1 DC h. Switch the SAMPLES/CM control out of SWEEP OFF OFFSET control and the indicator oscilloscope Horizontal position and set to fully clockwise.
  • Page 117 Calibration – Type 1S1 Fig. 5-59. Initial test equipment setup for step41. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Pre- set) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal Brightness DC OFFSET...
  • Page 118 Connect a banana/banana patch cord from-the OFF- SET OUTPUT jack to the jack at the Type 1S1 EXT HORIZ INPUT, as shown in Fig. 5-59. The patch cord from the Type 1S1 HORIZ OUTPUT jack to the indicator oscilloscope Ext Horiz Input jack should remain in place.
  • Page 119 Disconnect the patch cord from the Cal Out connector u. With the indicator oscilloscope Horizontal Position and the Type 1S1 EXT HORIZ INPUT jack. (Leave the patch control, position the displayed dot at the left edge of the cord connected between the Type 1S1 HORIZ OUTPUT graticule.

  • Page 120: Triggering Checks

    Calibration – Type 1S1 TABLE 5-6 Display Jitter Check Setup Readout TIME TRIGGER POSITION TIME/CM TIME/CM Signal SOURCE RANGE Jitter (Max.) (magnified) mVOLTS/CM (Magnified) MVOLTS/CM 1-µsec marker + INT 500 µS .2 µSEC .1 µSEC 1 cm (100 nsec) 5-Mc sine wave + INT 50 µS...
  • Page 121 Calibration – Type 1S1 Fig. 5-62. Typical indicator oscilloscope displays for checking display or triggering jitter. Measure the effective width of the trace containing 80% of the display dots. d. Adjust the variable attenuator and/or signal source for the indicated display amplitude.
  • Page 122 Calibration – Type 1S1 Fig. 5-64. Initial test equipment setup for steps 44 and 45. Type 1S1 Indicator Oscilloscope mVOLTS/CM Stability (both time bases) Counterclockwise (not Pre- set) mVolts/Cm VARIABLE Horizontal Display Ext Horiz Input VERT POSITION Centered Intensity Normal Brightness...
  • Page 123 Install the 10X probe on the vertical input of the test oscilloscope. Comparison Voltage 4.000 d. Connect the test probe to the Type 1S1 HORIZ OUT- Input Coupling (Chan PUT jack. nel A) e. Trigger the test oscilloscope display.

  • Page 124: Parts Ordering Information

    If a part you have ordered has been replaced with a new or improved part, your local Tektronix Field Office will contact you concerning any change in part number. ABBREVIATIONS AND SYMBOLS...

  • Page 125: Exploded View

    Parts List – Type 1S1 EXPLODED VIEW...
  • Page 126 Parts List – Type 1S1 EXPLODED VIEW SERIAL/MODEL NO. REF. PART NO. DESCRIPTION EFF. DISC. 366-0319-00 KNOB, red-FINE - - - - - - knob includes: 213-0020-00 SCREW, set, 6-32 x inch, HSS 366-0318-00 KNOB, charcoal-TIME POSITION - - - - - -...
  • Page 127 Parts List – Type 1S1 EXPLODED VIEW (Cont’d) SERIAL/MODEL NO. REF. PART NO. DESCRIPTION EFF. DISC. 366-0173-00 KNOB, charcoal-TRIGGER SOURCE - - - - - - knob includes: 213-0004-00 SCREW, set, 6-32 x 3/16 inch, HSS 262-0719-00 SWITCH, wired-TRIGGER SOURCE...
  • Page 128 Parts List – Type 1S1 EXPLODED VIEW (Cont’d) SERIAL/MODEL NO. REF. PART NO. DESCRIPTION EFF. DISC. - - - - - - mounting hardware: (not included w/switch) 210-0586-00 NUT, keps, 4-40 x ¼ inch 210-0579-00 NUT, hex, 5/8-24 x ¾ inch...
  • Page 129 Parts List – Type 1S1 EXPLODED VIEW (Cont’d) SERIAL/MODEL NO. REF. PART NO. DESCRIPTION EFF. DISC. 348-0031-00 GROMMET, polyethylene, snap-in, ¼ inch diameter 348-0031-00 GROMMET, delrin, .406 OD x.353 inch ID 348-0056-00 GROMMET, delrin, .500 OD x.485 inch ID 352-0086-00...
  • Page 130 Parts List – Type 1S1 EXPLODED VIEW (Cont’d) SERIAL/MODEL NO. REF. PART NO. DESCRIPTION EFF. DISC. 210-0201-00 LUG, solder - - - - - - mounting hardware for each: (not included w/lug) 213-0044-00 SCREW, thread cutting, 5-32 x 3/16, inch, PHS phillips...
  • Page 131 Parts List – Type 1S1 EXPLODED VIEW (Cont’d) SERIAL/MODEL NO. REF. PART NO. DESCRIPTION EFF. DISC. 670-0079-00 ASSEMBLY, board (HORIZONTAL) - - - - - - assembly includes: 388-0639-00 BOARD, etched circuit 131-0391-00 CONNECTOR, male 136-0125-00 SOCKET, 5 pin 387-0603-00...
  • Page 132 Parts List – Type 1S1 EXPLODED VIEW (Cont’d) SERIAL/MODEL NO. REF. PART NO. DESCRIPTION EFF. DISC. ASSEMBLY, DELAY LINE 119-0054-00 Assembly includes - - - - - - 131-0007-00 CONNECTOR, cable end 136-0125-00 SCREW, 6-32 x 5/16 inch BHS 210-0006-00...
  • Page 133 Parts List – Type 1S1 STANDARD ACCESSORIES PART NO SERIAL/MODEL NO. DESCRIPTION EFF. DISC. 012-0039-00 CORD, patch-banana, 18 inches 017-0044-00 ATTENUATOR, 50 , 10X 017-0078-00 ATTENUATOR, 50 , 10X 017-0063-00 ADAPTER, BNC to GR (female) 017-0064-00 ADAPTER, BNC to GR (male)
  • Page 134 Parts List – Type 1S1 Values are fixed unless marked variable. Tektronix Ckt. No. Part No. Description S/N Range Capacitors Tolerance ±20% unless otherwise indicated. *283-0123-00 Assembly 100-149 *283-0124-00 Assembly 150-up 281-0578-00 18 pf 500 v 281-0538-00 1 pf 500 v...
  • Page 135 Parts List – Type 1S1 Capacitors (Cont’d) Tektronix Ckt. No. Part No. Description S/N Range C240 283-0060-00 100 pf 200 v C246 285-0598-00 0.01 uf 100 v C249 283-0060-00 100 pf 200 v C250 283-0004-00 0.02 uf 150 v C257 283-0004-00 0.02 uf...
  • Page 136 Parts List – Type 1S1 Capacitors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. C461 293-0119-00 0.0022 uf 200 v C462 283-0070-00 30 pf 50 v C464 283-0059-00 1 uf 25 v C475 283-0000-00 0.001 uf 500 v C479...
  • Page 137 Parts List – Type 1S1 Diodes (Cont’d) Tektronix Ckt. No. Description Part No. D246 *152-0045-00 Silicon Selected from 1N622A D247 *152-0075-00 Germanium Tek Spec D260 *152-0185-00 Silicon Replaceable by 1N3605 D262 *152-0045-00 Silicon Selected from 1N622A D272 152-0185-00 Silicon Replaceable by 1N3605...
  • Page 138 Parts List – Type 1S1 Connectors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. P320† 131-0391-00 Coax, male J400 131-0106-00 Chassis mtd., 1 contact, female J410 131-0375-00 Right Angle, coax, female P410† 131-0391-00 Coax, male P640 131-0206-00 Probe Power...
  • Page 139 Parts List – Type 1S1 Transistors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. Q374 *151-0151 -00 Replaceable by 2N930 Q384 *151-0133-00 Selected from 2N3251 Q424 * 151 -0142-00 Selected from 2N3546 Q454 *151-0103-00 Replaceable by 2N2219 Q464 *151-0134-00...
  • Page 140 Parts List – Type 1S1 Resistors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. 315-0101-00 ¼w 308-0291-00 321-0247-00 3.65 k Prec 315-0101-00 ¼ w R56† 311-0535-00 2.5 k SMOOTHING R58A 321-0661-00 Prec R58B 321-0126-00 Prec R58C 321-0097-00 Prec R58D...
  • Page 141 Parts List – Type 1S1 Resistors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. R107 321-0222-00 Prec R109 321-0170-00 Prec R110 311-0480-00 Memory Bal R111 323-0353-00 46.4 k ½ w Prec R114 308-0258-00 R115 301-0472-00 4.7 k ½ w...
  • Page 142 Parts List – Type 1S1 Resistors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. R197 315-0101-00 ¼ w R199 301-0303-00 30 k ½ w R203 316-0106-00 10 meg ¼ w R205 315-0103-00 ¼ w R208 321-0267-00 5.9 k Prec...
  • Page 143 Parts List – Type 1S1 Resistors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. R299 315-0101-00 ¼ w R305 315-0471-00 ¼ w R306 317-0750-00 R308 315-0202-00 ¼ w R309 315-0163-00 16 k ¼ w R310 315-0330-00 ¼ w R313 321-0265-00 5.62 k...

  • Page 144: Trigger Sensitivity

    Parts List – Type 1S1 Resistors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. R418 322-0218-00 1.82 k ¼ w Prec R420 311-0496-00 2.5 k Int Trig Level R423 321-0261-00 5.11 k Prec R424 321-0204-00 1.3 k Prec R428 317-0390-00 R435†...
  • Page 145 Parts List – Type 1S1 Resistors (Cont’d) Tektronix Ckt. No. Description S/N Range Part No. R603 308-0082-00 R604 308-0003-00 R606 308-0209-00 R607 308-0223-00 R610 308-0075-00 R614 315-0333-00 33 k ¼ w R616 315-0472-00 4.7 k ¼ w R620 315-0203-00 20 k ¼...
  • Page 146 Parts List – Type 1S1 Transformers (Cont’d) Tektronix Ckt. No. Part No. Description S/N Range T340 *120-0374-00 Toroid 2T-4T T410 *120-0399-00 Toroid T630 *120-0400-00 Power Electron tubes 154-0413-00 8416 V183 154-0413-00 8416 V263 154-0417-00 8056 6-23...
  • Page 148 Test Oscilloscope: Bandpass Dc to 30 Mc Probe input Impedance 10 Megohms, 7 picofarads Probe Ground Clipped to Type 1S1 chassis Triggering External from point indicated on diagram Dc Voltmeter: Type Volt-Ohmmeter Sensitivity...
  • Page 150 Voltage readings are given in volts dc. Voltage measurements taken in any particular Type 1S1 may vary somewhat from those given, due to, normal differences in component characteristics. Waveform photographs were taken with a Tektronix Oscilloscope Camera System and Projected Graticule.
  • Page 158 MANUAL CHANGE INFORMATION At Tektronix, we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested. Sometimes, due to printing and shipping require- ments, we can't get these changes immediately into printed manuals.
  • Page 159 SCHEMATIC CORRECTION...

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