{"id":14280,"date":"2019-11-01T18:32:59","date_gmt":"2019-11-01T17:32:59","guid":{"rendered":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/?p=14280"},"modified":"2024-01-09T19:13:53","modified_gmt":"2024-01-09T18:13:53","slug":"oscilloscope-tektronix-type-565-serial-689-seventh-part","status":"publish","type":"post","link":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/oscilloscope-tektronix-type-565-serial-689-seventh-part\/","title":{"rendered":"Oscilloscope Tektronix Type 565 serial 689, fifth part ( MITI Muesum)"},"content":{"rendered":"

$\"\"$
\n $\"\"$ Oscilloscopio Tektronix Type 565. Quinta parte. <\/span>
\nNell\u2019inventario D del 1956 si trova al n\u00b0 3747 e risulta acquistato nell\u2019agosto del 1964; vi si legge: \u201cSilvestar ltd. Milano. Oscilloscopio Tektronix mod. 565 matr. 689. Dest. Elettronica \u20a4 1^{\u0387<\/sup>678^{\u0387<\/sup>600\u201d. Insieme alla fotocamera che \u00e8 al n\u00b0 3746, dove si legge: \u201cSilvestar ltd. Milano. Macchina fotografica Tektronix mod. C-12 completa di Bezel-Tektronix. Dest. Elettronica. \u20a4 557^{\u0387<\/sup>700\u201d.
\n<\/span>Il testo continua dalla quarta parte.
\n<\/span>\u00a7\u00a7\u00a7
\n<\/span>\u00abDEMONSTRATION 1<\/strong>: Measuring time between two pulses, <\/span>the first of which triggers Time Base <\/span>\u2018A\u2019.
\n<\/span>\u00a0 \u00a0 \u00a0 Set the controls and switches on the instrument as <\/span>listed above except as follows;
\n<\/span>\u2018A\u2019 TIME\/DIV.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0.1 mSEC
\n<\/span>\u2018B\u2019 TIME\/DIV.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a01 \u03bcSEC
\n<\/span> Apply the Amplitude Calibrator signal to the input of <\/span>both vertical plug-in units. The Upper Beam should display <\/span>about one cycle of the squarewave signal.
\n<\/span>Set the DELAY INTERVAL dial so the falling portion of
\n<\/span>the squarewave\u00a0 is intensified. Advance the Lower Beam
\n<\/span>INTENSITY control to obtain a display of normal intensity.
\n<\/span>The Lower Beam should now display a horizontally
\n<\/span>expanded version of the signal in the intensified segment of <\/span>the Upper Beam display.
\n<\/span>Set DELAY INTERVAL so the Lower Beam trace starts at
\n<\/span>About\u00a0 the 50% amplitude level of the squarewave. Multiply <\/span>the DELAY INTERVAL dial reading (e.g. 5.13) by the \u2018A\u2019 <\/span>sweep rate. The product is the time duration of the
\n<\/span>squarewave positive-going half-cycle.
\n<\/span>Accuracy
\n<\/strong><\/span>Accuracy is determined by the combination of all the
\n<\/span>following factors;
\n<\/span>1. The basic accuracy of the Time Base Generator, and
\n<\/span>therefore, of time measurements, is \u00b13%. In measurements
\n<\/span>made directly from the crt, this means \u00b13% of full <\/span>scale; that is, of the total time represented within the 10 <\/span>major graticule divisions. However, when the measurement <\/span>is made by using the sweep delay feature, the accuracy <\/span>is \u00b13\u00b0\/, of reading; that is, of the time being measured.
\n<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 NOTE
\n<\/span>During calibration, the internal DELAY START and <\/span>DELAY STOP adjustments are set when the Time <\/span>Base \u2018A\u2019 sweep rate is 1 mSEC per division. Therefore, <\/span>delay measurements made when using the<\/span>1 mSEC per division \u2018A\u2019 sweep rate will generally <\/span>be most accurate. The delay accuracy obtained <\/span>at any other \u2018A\u2019 sweep rate, 10 \u03bcseconds per <\/span>division or slower, can be increased by calibrating
\n<\/span>DELAY START and DELAY STOP at that sweep <\/span>rate. (In so doing, you may wish to verify that <\/span>all other \u2018A\u2019 sweep rates produce delays that are <\/span>accurate within 3%). These adjustments do not <\/span>affect the Time Base \u2018A\u2019 crt sweep rate. See the <\/span>Calibration Procedure, Section 5, step 10.
\n<\/span>2. The effect that the linearity of the Delay Interval <\/span>system has on the measurement accuracy depends on the <\/span>DELAY INTERVAL dial setting that is used. The linearity <\/span>factor, as a percentage of reading, decreases as the dial <\/span>setting increases. With any dial setting, the inaccuracy due <\/span>to non-linearity will not exceed 0.5% of full scale delay.
\n<\/span>3. Measurements are valid only when DELAY INTERVAL <\/span>dial settings above 0.50 are used.
\n<\/span>4. The triggering point can affect the measurement
\n<\/span>accuracy since the triggering signal does not rise in zero
\n<\/span>time. For example, if the sweep is triggered by the first
\n<\/span>portion of the pulse rise, most of the pulse risetime will be
\n<\/span>included in the measurement. This is of little concern in
\n<\/span>measurements, such as the one made in Demonstration 1,
\n<\/span>where the risetime of the signal is a relatively insignificant
\n<\/span>percentage of the time being measured. However, as the
\n<\/span>risetime percentage of the measured time increases, it
\n<\/span>becomes more important that the triggering point be known.
\n<\/span>One way to establish a known triggering point is to set the
\n<\/span>LEVEL control at one end of the range in which a stable,
\n<\/span>triggered Upper Beam display is obtained. Most of the
\n<\/span>risetime of the signal will be included in the measurement
\n<\/span>when:
\n<\/span>a. \u2018A\u2019 TRIGGER SLOPE is set to + and LEVEL is set to
\n<\/span>the \u2014 end of the “triggering” range (positive-going
\n<\/span>signals), or
\n<\/span>b. \u2018A\u2019 TRIGGER SLOPE is set to – and LEVEL is set to
\n<\/span>the + end of the \u201ctriggering\u201d range (negative-going <\/span>signals).
\n<\/span>5. The Time Base \u2018A\u2019 Trigger, Time Base \u2018A\u2019 Generator,
\n<\/span>Delay Pickoff, and Time Base \u2018B\u2019 Generator circuits typically <\/span>require a total of about 1.0 to 1.5 microseconds to respond <\/span>to the signal event which triggers Time Base \u2018A\u2019. This small <\/span>delay need not be considered unless it is a significant <\/span>percentage of the time being measured. When necessary, add <\/span>the circuit delay time to the measured time.
\n<\/span>6. The 5, 2, and 1 \u03bcSEC\/DIV A sweep rates generally are
\n<\/span>not used for measurements such as those described in
\n<\/span>Demonstration 1.
\n<\/span>Summary<\/strong>\u2014The method described in Demonstration 1 will
\n<\/span>provide greatest time measurement accuracy when:
\n<\/span>a. the internal DELAY START and DELAY STOP adjustments <\/span>are calibrated at the sweep rate to be used,
\n<\/span>b. dial settings above 4.0 or 5.0 are used,
\n<\/span>c. the event triggering Time Base \u2018A\u2019 has a fast rise time,
\n<\/span>and
\n<\/span>d. Time Base \u2018A’ sweep rates of 50 \u03bcSEC\/DIV. or slower
\n<\/span>are used.
\n<\/span>DEMONSTRATION 2<\/strong>: Measuring time between two pulses <\/span>of a pulse train, neither of which triggers Time Base \u2018A\u2019.
\n<\/span>Set the controls and switches on the instrument as listed
\n<\/span>except as follows:
\n<\/span>\u2018A\u2019 TIME\/DIV.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0.2 mSEC
\n<\/span>Apply the Amplitude Calibrator signal to the input of\u00a0 <\/span>both vertical plug-in units. The Upper Beam should display <\/span>about two cycles of the squarewave signal. Set the
\n<\/span>DELAY INTERVAL dial so the squarewave rise located near <\/span>the center of the Upper Beam display is intensified.
\n<\/span>Advance the Lower Beam INTENSITY control to obtain
\n<\/span>a display of normal intensity. The Lower Beam should now
\n<\/span>display a horizontally expanded version of the intensified
\n<\/span>Upper Beam display segment.
\n<\/span>Set DELAY INTERVAL so the 50% amplitude level of the
\n<\/span>squarewave rise intersects the vertical line at the center <\/span>of the graticule. Note the exact DELAY INTERVAL dial <\/span>setting (e.g. 5.14). Turn the DELAY INTERVAL dial clockwise <\/span>until the 50% amplitude level of the squarewave fall <\/span>intersects the same vertical graticule line used with the previous <\/span>dial setting. Again note the exact DELAY INTERVAL dial <\/span>setting.
\n<\/span>Subtract the first dial setting from the second. The <\/span>product of this difference and the Time Base \u2018A\u2019 TIME\/DIV. <\/span>equals the time duration of the squarewave positive-going <\/span>half-cycle (between the 50% amplitude points).
\n<\/span>Accuracy
\n<\/strong><\/span>Accuracy is determined by the combination of all the
\n<\/span>following factors:
\n<\/span>1. The basic accuracy of the Time Base \u2018A\u2019 generator is <\/span>the same as described in Demonstration 1.
\n<\/span>2. The percentage of error that the Delay Interval system <\/span>linearity adds to the measurement depends on the numerical
\n<\/span>difference between the two dial settings used; this error
\n<\/span>decreases as the numerical difference increases. The amount <\/span>of time error in the measurement is less than 1% of the full
\n<\/span>scale delay (1%, of ten times the ‘A’ sweep TIME\/DIV.).
\n<\/span>However, this applies only when the DELAY INTERVAL dial <\/span>settings are separated by at least 100 minor dial divisions.<\/span>
\nNOTE
\n<\/span>When the separation between dial settings is <\/span>one hundred minor dial divisions or less, the <\/span>desired time measurement can often be made more<\/span> accurately by direct reading from a magnified <\/span>crt display. See Demonstration 3; Magnification.
\n<\/span>3. Measurements are valid only when DELAY INTERVAL
\n<\/span>dial settings above 0.50 are used.
\n<\/span>4. The accuracy of time measurements made according <\/span>to Demonstration 2 is independent of the inherent circuit <\/span>delays and of the triggering point (discussed in <\/span>Demonstration 1), provided the \u2018A\u2019 LEVEL control setting <\/span>is the same <\/span>for each of the two dial readings.
\n<\/span>5. The 2 and 1 \u03bcSEC\/DIV. A sweep rates generally are <\/span>not used in measurements such as those described in <\/span>Demonstration 2.
\n<\/span>Summary<\/strong>\u2014 The method described in Demonstration 2 can
\n<\/span>provide a time measurement accuracy within 1% of reading.
\n<\/span>\u00a0Accuracy will be greatest when:
\n<\/span>a. the internal DELAY START and DELAY STOP
\n<\/span>adjustments are calibrated at the sweep rate to be used, and
\n<\/span>b.the numerical difference between the two DELAY <\/span>INTERVAL dial settings is greatest.
\n<\/span>DEMONSTRATION 3<\/strong>: Magnification
\n<\/span>Complex signals often consist of a number of individual
\n<\/span>events of different amplitudes. Since the trigger circuits
\n<\/span>of the Type 565 are sensitive to signal amplitude, a stable
\n<\/span>display will normally be obtained only when the sweep <\/span>is triggered by the event having the greatest amplitude.
\n<\/span>The \u201cStarts After Delay Interval\u201d mode permits the start <\/span>of a sweep to be delayed for a selected time after the <\/span>signal event having the greatest amplitude.\u00a0 Any event <\/span>within the series of events may then be displayed in <\/span>magnified form as follows:
\n<\/span>Set the controls and switches on the Type 565 as listed. <\/span>Apply the Amplitude Calibrator signal to the input of both
\n<\/span>vertical plug-in units. The Upper Beam should display
\n<\/span>several cycles of the squarewave signal. Set the DELAY
\n<\/span>INTERVAL dial to intensify one of the positive-going pulses.
\n<\/span>Advance the Lower Beam INTENSITY control to obtain
\n<\/span>a display of normal intensity. The Lower Beam display
\n<\/span>should now contain the same signal information as the
\n<\/span>intensified Upper Beam trace segment, but horizontally
\n<\/span>expanded (magnified) ten times.
\n<\/span>Increase the Time Base \u2018B\u2019 sweep rate to 1 microsecond
\n<\/span>per division. Set the DELAY INTERVAL dial so the intensified <\/span>segment in the Upper Beam trace extends throughout\u00a0 the <\/span>rise of one of the positive-going pulses. The Lower Beam <\/span>display now gives X1000 magnification.
\n<\/span>Slowly turn the DELAY INTERVAL dial. Note that any
\n<\/span>portion of the Upper Beam display can be brought into <\/span>view in magnified form on the Lower Beam display (except <\/span>for a small portion at the beginning and end of the Upper <\/span>Beam Display). The DELAY INTERVAL dial indication <\/span>corresponds to the number of major graticule divisions
\n<\/span>between the beginning of the Upper Beam trace and the
\n<\/span>beginning of the intensified trace segment; e.g. 7.00 = 7
\n<\/span>major divisions.
\n<\/span>Set the Time Base \u2018B’ sweep rate to 10 microseconds per <\/span>division. Set the DELAY INTERVAL dial so a squarewave
\n<\/span>rise is centered in the Lower Beam display. Set UPPER
\n<\/span>HORIZ. DISPLAY to \u2018B\u2019 TIME BASE and turn on the Upper <\/span>Beam IOX MAG. Set the Upper Beam horizontal POSITION <\/span>so the squarewave rise is visible in the Upper Beam display.
\n<\/span>The Lower Beam now gives 100 times magnification
\n<\/span>and the Upper Beam gives 1000 times magnification of the
\n<\/span>information that was contained in the intensified segment <\/span>of the original Upper Beam display.
\n<\/span>Both the Upper and Lower Beam display will probably
\n<\/span>exhibit some horizontal jitter. Part of the jitter is due to a
\n<\/span>slight inconsistency in the Amplitude Calibrated signal
\n<\/span>frequency, and part is due to jitter in the delay system. The <\/span>jitter contributed by the delay system is less than 0.05%
\n<\/span>of the Time Base \u2018A\u2018 sweep rate (0.05% of 1 millisecond
\n<\/span> = 0.5 microsecond). With 1000 times magnification, the
\n<\/span>Upper Beam sweep rate is 1 microsecond per division.
\n<\/span>Hence, the jitter due to the delay system is less than <\/span>one-half major division.
\n<\/span>Accuracy
\n<\/strong><\/span>1. The accuracy of time measurements made from
\n<\/span>magnified displays such as those described in the foregoing
\npara<\/span>graphs, depend solely on the Time Base \u2018B\u2018 sweep rate
\n<\/span>accuracy (\u00b13%, with the 10X MAG. off and \u00b15 with the10X MAG. on).
\n<\/span>DEMONSTRATION 4<\/strong>: Delayed Trigger
\n<\/span>Ordinarily, a signal which is to be displayed is also used <\/span>to trigger the oscilloscope sweeps so a stable display is <\/span>obtained. In some situations, it may be desirable to <\/span>reverse this situation. The sweep-related output pulses, <\/span>available at the rear panel of the Type 565, can be used* as <\/span>the input or triggering signals for external devices. The <\/span>output signal of the external device will then produce a <\/span>stable display while the oscilloscope sweep free-runs.
\n<\/span>To demonstrate one method of performing this operation,
\n<\/span>proceed as follows:
\n<\/span>Set the controls and switches on the Type 565 as listed
\n<\/span>except as follows;
\n<\/span>\u2018A\u2019 TRIGGER source\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 EXT.
\n<\/span>\u2018A\u2019 TRIGGER COUPLING\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 DC
\n<\/span>\u2018A\u2019 TIME\/DIV.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 10 \u03bcSEC
\n<\/span>\u2018B\u2019 MODE\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0NORMAL TRIGGER
\n<\/span>\u2018B\u2019 TRIGGER LEVEL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 FREE RUN
\n<\/span>DELAY INTERVAL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1.00
\n<\/span>INTENSITY (Upper)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0normal
\n<\/span> Connect: (rear panel and front panel connections)
\n<\/span>\u2018B\u2019 + GATE OUT\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0to\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u2018A\u2019 TRIG. IN
\n<\/span>DEL’D TRIG. OUT\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0to\u00a0\u00a0\u00a0\u00a0\u00a0 INPUT of the Upper Beam plug-in unit
\n<\/span> Set \u2018A\u2019 TRIGGER LEVEL mid-way between \u2018O\u2019 and FREE
\n<\/span>RUN so Time Base \u2018A\u2019 triggers on the rise of the \u2018B\u2019 + GATE
\n<\/span>OUT signal. The Upper Beam should now display a narrow,
\n<\/span>positive-going pulse.
\n<\/span><\/p>\n}}}

\n
*Output current must not exceed 2 ma peak.
\n<\/span>
\n<\/strong>The oscilloscope display that you have established shows <\/span>a pulse that is available from the Type 565 during each Time <\/span>Base \u2018A\u2019 sweep. In a practical application, the pulse would
\n<\/span>not be applied to the vertical input of the oscilloscope, but
\n<\/span>instead to some external device to be tested. The pulse would <\/span>serve as the trigger pulse for the external device and the <\/span>output of the device would be displayed on the oscilloscope.
\n<\/span>Since the pulse has a known time-relationship to
\n<\/span>each Time Base \u2018A\u2019 sweep, the output of the device will
\n<\/span>provide a stable display on the oscilloscope, as though <\/span>the oscilloscope were triggered in the normal manner.
\n<\/span>The set-up described in the foregoing paragraphs permits <\/span>you to vary the repetition rate of the pulse applied to the
\n<\/span>external device. To do this, monitor the pulse signal on <\/span>another oscilloscope and set ‘B’ TIME\/DIV. and VARIABLE <\/span>for the desired repetition rate. \u2018A\u2019 TIME\/DIV. controls only <\/span>the display sweep rate as long as the Time Base \u2018A\u2019 Sweep <\/span>rate is at least twice that of Time Base \u2018B\u2019.
\n<\/span>Set ‘B’ MODE to MANUAL TRIGGER and press the MANUAL <\/span>TRIGGER push-button. This set-up permits you to <\/span>produce each DEL’D TRIG. OUT pulse manually.
\n<\/span>DEMONSTRATION 5<\/strong>: Pulse Generation <\/span>The \u2018B\u2019 + GATE OUT signal of the Type 565 can be used <\/span>as a low-current*, variable repetition rate, variable duty<\/span>factor pulse generator in applications where the pulse shape <\/span>is of secondary importance. To use the Type 565 in this <\/span>manner, proceed as follows:
\n<\/span>Set
\n<\/span> UPPER HORIZ. DISPLAY\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2018A\u2019 TIME BASE
\n<\/span> LOWER HORIZ. DISPLAY\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u2018B\u2019 TIME BASE
\n<\/span>\u2018B\u2019 MODE\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0STARTS AFTER DELAY <\/span>INTERVAL
\n<\/span> DELAY INTERVAL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0about 0.50
\n<\/span>LEVEL\u00a0 (\u2018A\u2019 and \u2018B\u2019)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 FREE RUN
\n<\/span>The pulse signal is available at the \u2018B\u2019 + GATE OUT
\n<\/span>connector on the rear panel. Monitor the signal on another
\n<\/span>oscilloscope and establish the desired pulse repetition rate by <\/span>setting the Type 565 ‘A’ TIME\/DIV. and VARIABLE. Establish <\/span>the desired duty factor by setting \u2018B\u2019 TIME\/DIV.
\n<\/span>The maximum pulse repetition frequency that can be
\n<\/span>obtained in this manner is about 10 to 12 kc. Maximum duty <\/span>factor is about 0.6, decreasing with faster sweep rates.
\n<\/span>A slight alteration in this set-up will produce a double- <\/span>pulse generator. To do this, start with a B sweep rate that is
\n<\/span>at least 5 times faster than the A sweep rate. Set DELAY
\n<\/span>INTERVAL to about 5.00. Connect a 100 pf capacitor between <\/span>the center conductors of the A+ GATE OUT and DEL’D <\/span>TRIG OUT connectors on the rear of the instrument.
\n<\/span>The B + GATE OUT pulse will now occur twice during <\/span>each A sweep; the first beginning as A sweep begins and
\n<\/span>the second begins at the end of the delay interval.
\n<\/span>The time separation between pulses is controlled by setting
\n<\/span>DELAY INTERVAL. The minimum separation that can obtained <\/span>is a function of the Time Base B Generator hold-off time.
\n<\/span><\/p>\n
\n
*Output current must not exceed 2ma peak.<\/strong><\/p>\n
Triggerable After Delay Interval
\n<\/strong><\/span>Complex signals often contain a number of individual
\n<\/span>events of different amplitudes. Since the trigger circuits <\/span>in the Type 565 are sensitive to signal amplitude, a stable <\/span>display will normally be obtained only when the sweep is
\n<\/span>triggered by the event having the greatest amplitude.
\n<\/span>The TRIGGERABLE AFTER DELAY INTERVAL feature of the <\/span>Type 565 provides a means of triggering the sweep by events <\/span>other than those having the greatest amplitude. The following <\/span>instructions permit you to demonstrate that Time Base <\/span>\u2018B\u2019 can be triggered by virtually any event within a series <\/span>of events.
\n<\/span>Set the controls and switches on the instrument as listed
\n<\/span>except as follows:
\n<\/span>Lower Beam INTENSITY\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0for normal display
\n<\/span>Time Base \u2018B\u2019 TRIGGER\u00a0 controls.\u00a0\u00a0\u00a0\u00a0\u00a0 some settings as Time <\/span>controls Base \u2018A\u2019 TRIGGER
\n<\/span>Connect the CAL. OUT signal to both the Upper and Lower
\n<\/span>Beam vertical input connectors. Each beam should present
\n<\/span>a square wave display.
\n<\/span>Turn the DELAY INTERVAL dial about 2 turns in either
\n<\/span>direction. Notice that both the Lower Beam display and
\n<\/span>the brightened segment in the Upper Beam display, move
\n<\/span>smoothly across the crt.
\n<\/span>Set the DELAY INTERVAL dial so the brightened segment
\n<\/span>in the Upper Beam display begins about in the middle of a
\n<\/span>pulse top. Notice that the Lower Beam display also begins
\n<\/span>in the middle of a pulse top. Now, set the \u2018B\u2019 MODE switch
\n<\/span>to the TRIGGERABLE AFTER DELAY INTERVAL position.
\n<\/span>Notice that the brightened segment in the Upper Beam
\n<\/span>display has shifted to the next pulse on the right. The Lower
\n<\/span>Beam display now begins within the rising portion of the <\/span>pulse.
\n<\/span>Now turn the DELAY INTERVAL dial several full turns.
\n<\/span>The brightened segment in the Upper Beam display should
\n<\/span>jump from one pulse to the next. In this demonstration,
\n<\/span>the Lower Beam display appears unchanged because all
\n<\/span>pulses are identical.
\n<\/span>The display is produced in the following manner:
\n<\/span>Time Base \u2018B\u2019 produces one sweep for each \u2018A\u2019 sweep.
\n<\/span>\u2018B\u2019 sweep will begin at some time after the start of\u00a0 \u2018A\u2019
\n<\/span>sweep. This time is the total of (1) the Time Base \u2018A\u2019 sweep
\n<\/span>rate (TIME\/DIV.) multiplied by the DELAY INTERVAL dial <\/span>setting, plus (2) the time between the end of this delay
\n<\/span>interval and the next event in the signal which can trigger Time <\/span>Base \u2018B\u2019.
\n<\/span>It is possible that Time Base \u2018B\u2019 might not be triggered
\n<\/span>until long after Time Base \u2018A\u2019 has completed its sweep. If
\n<\/span>separate triggering signals are being applied to the two time
\n<\/span>bases, Time Base \u2018A\u2019 could produce several additional sweeps
\n<\/span>before Time Base \u2018B\u2019 receives a triggering signal. Because
\n<\/span>of this, the brightened trace segment could appear at any
\n<\/span>point on the Upper Beam trace or might not appear at all.
\n<\/span>Delayed Trigger Output
\n<\/strong><\/span>The delayed trigger output pulse is always available at <\/span>the rear panel connector at the predetermined time during <\/span>each sawtooth produced by Time Base \u2018A\u2019, regardless of the <\/span>\u2018B\u2019 MODE switch setting. This output signal is discussed <\/span>in greater detail under \u201cStarts After Delay lnterval\u201d, <\/span>Demonstration 4.
\n<\/span>External Horizontal Inputs
\n<\/strong><\/span>For special applications, you can deflect either beam <\/span>horizontally with an externally derived signal. This permits <\/span>you to use the oscilloscope to plot one function versus
\n<\/span>another. The maximum bandpass of the horizontal amplifier
\n<\/span>occurs at the fully clockwise setting of the EXT. HORIZ. GAIN <\/span>control; dc to at least 350 kc.
\n<\/span>To use an external signal for horizontal deflection, <\/span>connect the signal to either the Upper or Lower Beam EXT. <\/span>HORIZ. IN connector. Place the appropriate horizontal <\/span>display switch in the EXT. position. The horizontal deflection <\/span>factors can be varied by adjusting the EXT. HORIZ GAIN
\n<\/span>control such that a one volt peak-to-peak signal will produce <\/span>from zero to at least 10 major graticule divisions of deflection.
\n<\/span>The 10X MAG. switch has no effect when external horizontal <\/span>deflection is used.
\n<\/span>Amplitude Calibrator
\n<\/strong><\/span>The amplitude calibrator provides a convenient source <\/span>of square waves of known amplitude at a frequency of <\/span>approximately 1kc. The square waves are used primarily <\/span>to adjust probe compensation and to verify the amplitude <\/span>calibration of the oscilloscope vertical deflection systems.
\n<\/span>Calibrator square waves are adjustable from 1 millivolt <\/span>to 100 volts, peak-to-peak, in decade steps. The amplitude <\/span>is controlled by the setting of the PEAK-TO-PEAK VOLTS <\/span>switch. The output voltage is ac-curate within 3% of the PEAK- <\/span>TO-PEAK VOLTS switch setting when the output is connected <\/span>to a high-impedance load such as the INPUT connector of a <\/span>vertical plug-in unit.
\n<\/span>When the .001, .01, .1 volt settings of the PEAK-TO-PEAK
\n<\/span>VOLTS switch are used, it will be necessary to use a coax
\n<\/span>cable to take the signal from the CAL. OUT connector. The
\n<\/span>outer conductor of the cable must make good contact with
\n<\/span>the shield portion of the CAL. OUT connector in order to
\n<\/span>obtain an accurate output voltage.
\n<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 AUXILIARY FUNCTIONS
\n<\/strong><\/span>Intensity Modulation
\n<\/strong><\/span>The rear panel jacks marked UPPER BEAM CRT GRID and <\/span>LOWER BEAM CRT GRID permit external signals to vary <\/span>the intensity of the traces (Z-axis modulation). This feature <\/span>can be used to refer oscilloscope time measurements to an <\/span>external timing standard.
\n<\/span>In some applications, you may wish to use the VARIABLE
\n<\/span>TIME\/DIV. control at an uncalibrated position to obtain a
\n<\/span>sweep rate other than those provided by the TIME\/DIV.
\n<\/span>switch. Intensity modulation with time-marker pulses will
\n<\/span>permit you to establish and monitor the desired sweep rate.
\n<\/span>This will eliminate the need for a separate vertical display of <\/span>a time reference signal.
\n<\/span>Fast-rise pulses of short duration are usually used for
\n<\/span>intensity modulation because they produce an easily
\n<\/span>interpreted display. When other types of signals are used, it is <\/span>important to note that sinewaves below 250 cycles will be
\n<\/span>attenuated due to the ac signal coupling within the
\n<\/span>instrument. The signal amplitude required for visible trace
\n<\/span>modulation depends upon the intensity level of the
\n<\/span>unmodulated trace.
\n<\/span>Trace Photography
\n<\/strong><\/span>Several features of the Type 565 Oscilloscope are
\n<\/span>particularly important when photographying\u00a0 the crt display. The <\/span>rubber washers normally installed between the graticule <\/span>and the bezel should be removed when either the light <\/span>filter or a camera-mount bezel is installed. When a light <\/span>filter is used, the graticule should be placed between it and <\/span>the crt.
\n<\/span>There are two pairs of holes in the graticule for the scale
\n<\/span>illumination pilot lamps. One pair is colored red and will
\n<\/span>produce red graticule lines when aligned with the pilot lamps.
\n<\/span>The second pair is clear and will produce white graticule
\n<\/span>lines. White lines should be used whenever the light filter
\n<\/span>is installed or when photographs are being taken. When the
\n<\/span>trace is viewed without a light filter, the red lines are usually <\/span>easier to see. In all cases, the side of the graticule that bears <\/span>the scribed lines should be placed against the crt face.
\n<\/span>The CONTRAST control, located inside the instrument at
\n<\/span>the left side of the High Voltage Power Supply chassis, <\/span>permits you to control the relative intensity of the intensified <\/span>trace segment obtained in delayed sweep operation. This <\/span>control is usually set fully clockwise (greatest contrast) for <\/span>normal viewing. However, it may require resetting for less <\/span>contrast while photographs are being taken so all portions of <\/span>the picture will be properly exposed.
\n<\/span>The CAMERA POWER jack, on the front panel, provides a
\n<\/span>convenient power source for future camera accessories.
\n<\/span>The Single-Sweep feature, described previously in this
\n<\/span>section, is often used when non-repetitive waveforms are <\/span>photographed.
\n<\/span>Aux. Power Jack
\n<\/strong><\/span>The auxiliary power jack on the rear panel is provided to
\n<\/span>power future accessories for the Type 565, as well as other <\/span>devices\u00bb.<\/span> $\"\"$
\n\u00a7\u00a7\u00a7
\n<\/span>Il testo prosegue nella sesta parte.
\n<\/span>Per consultare le altre schede dedicate a questo oscilloscopio esposto al Museo MITI (su proposta di Fabio Panfili)<\/span>\u00a0scrivere \u201c565\u201d su Cerca.
\n<\/span>Elaborazioni e testo a cura di Fabio Panfili.
\n<\/span>Per ingrandire le immagini cliccare su di esse col tasto destro del mouse e scegliere tra le opzioni.<\/span><\/span>
\n $\"\"$ $\"\"$ $\"\"$ $\"\"$
\n<\/span><\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Oscilloscopio Tektronix Type 565. Quinta parte. Nell\u2019inventario D del 1956 si trova al n\u00b0 3747 e risulta acquistato nell\u2019agosto del 1964; vi si legge: \u201cSilvestar ltd. Milano. Oscilloscopio Tektronix mod. 565 matr. 689. Dest. Elettronica \u20a4 1\u0387678\u0387600\u201d. Insieme alla fotocamera che \u00e8 al n\u00b0 3746, dove si legge: \u201cSilvestar ltd. Milano. Macchina fotografica Tektronix mod. … <\/p>\n
Leggi tutto “Oscilloscope Tektronix Type 565 serial 689, fifth part ( MITI Muesum)”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/posts\/14280"}],"collection":[{"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/comments?post=14280"}],"version-history":[{"count":4,"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/posts\/14280\/revisions"}],"predecessor-version":[{"id":25531,"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/posts\/14280\/revisions\/25531"}],"wp:attachment":[{"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/media?parent=14280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/categories?post=14280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.istitutomontani.edu.it\/museovirtuale\/wp-json\/wp\/v2\/tags?post=14280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}