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Tektronix 7853A, Instruction Manual

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Tektronix 7853A Instruction Manual Download Page 6

Operating Instructions

—7B53A/7B53AN 

Operators

Variable Selector Connector

(P140)

Right

 Side

 

Of

 Instrument

Variable 

Delayed

 

Sweep Rates

Variable

 Main

 

Sweep

 

Rates

Variable

 Main

 

Sweep Holdoff

Delayed Gate Out 

Connector

 

(P613)

Delayed

 Gate

 

Out

 

Signal 

Connected .

 

to DLY'D TRIG IN

 

Connector

Connector

(P613)

Left

 Side

 

Of 

Instrument

Fig.

 1-3.

 Location of Delayed Gate Out and Variable Selector multi-pin connectors.

REV. APR 1974

®I

1-2

Summary of Contents for 7853A

Page 1: ...TEKTRONIX 7B53A 7B53AN DUAL TIME BASE OPERATORS INSTRUCTION MANUAL Tektronix Inc 070 1252 00 P O Box 500 Beaverton Oregon 97005 772 ...

Page 2: ...assure you the fastest possible service Please include the instrument Type Number or Part Number and Serial Number with all requests for parts or service Specifications and price change privileges reserved Copyright 1972 by Tektronix Inc Beaverton Oregon Printed in the United States of America All rights reserved Contents of this publication may not be reproduced in any form without permission of ...

Page 3: ...Time Measurement 1 12 Sweep Magnifier 1 12 Display Modes 1 13 Delay Time Multiplier 1 13 Delayed Sweep Triggering 1 14 Input Output Connectors 1 14 X Y Operation 1 14 Mainframe Operating Modes 1 15 Applications 1 15 General 1 15 Comparison Measurement Techniques 1 15 Time Duration Measurements 1 16 Determining Frequency 1 16 Risetime Measurements 1 17 Delayed Sweep Measurements 1 18 Delayed Sweep ...

Page 4: ...Fig 1 1 7B53A and 7B53AN Dual Time Base Units 7B53A 7B53AN Operators ...

Page 5: ... as an amplifier for X Y operation To install the 7B53A 7B53AN in a plug in compart ment push it in until it fits firmly into the compartment The front panel of the 7B53A 7B53AN should be flush with the front panel of the indicator oscilloscope Even though the gain of the indicator oscilloscope is standardized to minimize adjustment when inserting plug in units the sweep calibration of the 7B53A 7...

Page 6: ...able Delayed Sweep Rates Variable Main Sweep Rates Variable Main Sweep Holdoff Delayed Gate Out Connector P613 Delayed Gate Out Signal Connected to DLY D TRIG IN Connector Connector P613 Left Side Of Instrument Fig 1 3 Location of Delayed Gate Out and Variable Selector multi pin connectors REV APR 1974 I 1 2 ...

Page 7: ...ormation is given under General Operating Information Fig 1 4 shows the front panel and external controls and connectors of the 7B53A 7B53AN SLOPE Two position switch permits triggering on the positive going or negative going portion of the main trig gering signal TRIG D Light indicates that the main sweep is triggered and will produce a display MODE Pushbutton switches select the operating mode f...

Page 8: ...the triggering signal to the delayed triggering circuits SOURCE Two position switch to select the source of the delayed triggering signal 5 Input Output Connectors MAIN TRIG IN OR AMP IN Front panel BNC connec tor serving as an external trigger input for the main triggering circuit or as an external horizontal input depending upon the setting of the TIME DIV OR DLY TIME switch and the MAIN TRIGGER...

Page 9: ...ry adjust the SWP CAL screwdriver adjustment for one complete time mark per division over the center eight divisions of display Dis connect the Time Mark Generator NOTE The Time Division switch selects main sweep rates delayed sweep rates and Display Modes MAIN SWP INTEN DLY D SWP and MIXED Refer to Selecting Sweep Rates and Display Modes discussions in the General Operating Instructions for furth...

Page 10: ...UPLING switch set to AC AC HF REJ and DC MAIN TRIGGERING LEVEL control may be adjusted as necessary Remove all connections from the oscilloscope system 15 Connect the indicator oscilloscope Calibrator signal to the vertical unit Input connector and to the MAIN TRIG IN connector Set the Calibrator for a 0 4 volt 1 kilohertz signal and adjust the vertical unit Volts Div switch for about four divisio...

Page 11: ...ons or the instruction manuals for the associated oscilloscope and vertical unit for more information Triggered Light The TRIG D light conveniently indicates the condition of the triggering circuits If the MAIN TRIGGERING controls are correctly set and an adequate trigger signal is applied the TRIG D light is on Under certain conditions the TRIG D light may be off indicating that the sweep is not ...

Page 12: ...ty can be increased by reducing the ambient light level or using a viewing hood as recommended in the indicator oscilloscope instruction manual Non repetitive random signals can be displayed in the SINGLE SWP MODE by first obtaining the best possible display in the NORM MODE with a signal which is about the same amplitude and frequency as the random signal Then without changing the other MAIN TRIG...

Page 13: ...igger signal may be provided by the associated vertical unit or indicator oscilloscope see the instruction manuals for these instru ments for information For most applications the INT position of the SOURCE switch can be used However some applications require special triggering which cannot be obtained in the INT position of the SOURCE switch In such cases the LINE or EXT positions of the SOURCE s...

Page 14: ...Operating Instructions 7B53A 7B53AN Operators Fig 1 6 Effect of LEVEL control and SLOPE switch on CRT display 1 10 ...

Page 15: ...TIME switch and the DLY D Time Division switch are set to the same sweep rate the switches lock together and the sweep rate of both generators are changed at the same time However when the DLY D Time Division knob is pulled outward the clear plastic flange is disengaged and only the delayed sweep generator sweep rate is changed This allows changing the delayed sweep rate without changing the delay...

Page 16: ...uivalent length of the magnified sweep is more than 100 divisions any 10 division portion can be viewed by adjusting the POSITION control to bring the desired portion onto the viewing area To use the MAG switch first move the portion of the display which is to be expanded to the center of the graticule Then press and release the MAG switch to the OUT X10 position When the MAG switch is in the X10 ...

Page 17: ... Mode for the desired sweep rate and then pushed in In this mode the intensified portion of display as viewed in the INTEN Display Mode is displayed on the CRT at the sweep rate indicated by the DLY D Time Division switch see Fig 1 10B Calibrated sweep rates in the DLY D SWP Display Mode are available from 5 s DIV to 0 05 µs DIV Uncalibrated delayed sweep rates to 1 25 seconds division can be obta...

Page 18: ...ed triggering as functions with the same title are for MAIN TRIGGERING see Main Triggering Level Slope Coupling and Source discussions in this section Input Output Connectors Two dual function BNC connectors are provided on the instrument front panel MAIN TRIG IN OR AMP IN This connector is an external trigger input for the main triggering circuit when the MAIN TRIGGERING SOURCE switch is set to E...

Page 19: ...h the period of the reference signal must be known If it is not known it can be measured before the VARIABLE switch is set in step 2 4 Divide the period of the reference signal seconds by the product of the horizontal deflection established in step 2 division and the setting of the TIME DIV OR DLY TIME switch This is the horizontal conversion factor Horizontal Conversion Factor reference signal pe...

Page 20: ... display the plug in units used 3 Set the Volts Division switch of the vertical unit to display about four divisions of waveform 4 Set the MAIN TRIGGERING controls to obtain a stable display Time Duration 5 X 0 1 ms The time duration is 0 5 millisecond Determining Frequency The time measurement technique can also be used to determine the frequency of a signal The frequency of a periodically recurr...

Page 21: ...form to the second vertical line of the graticule For example with a five division display as shown in Fig 1 14 the 10 point is 0 5 division up from the start of the rising portion 2 Set the Vertical and Horizontal Mode switches on the indicator oscilloscope to display the plug in unit used 9 Measure the horizontal distance between the 10 and 90 points Be sure the VARIABLE control is set to CAL 3 ...

Page 22: ...SWP Display Mode 9 Adjust the DELAY TIME MULT dial to move the pulse or the rising portion to the center vertical graticule line Note the exact setting of the dials 10 Turn the DELAY TIME MULT dial clockwise until the second pulse is positioned to the same point as the first pulse If several pulses are displayed return to the INTEN DISPLAY MODE to locate the correct pulse Again note the exact dial...

Page 23: ...Time Division switch for the DLY D SWP Display Mode 9 Time Measurements can be made from the display in the conventional manner Sweep rate is determined by the setting of the DLY D Time Division switch 10 The apparent sweep magnification can be calculated by dividing the TIME DIV OR DLY TIME switch setting by the DLY D Time Division switch setting Example The apparent magnification of the display ...

Page 24: ... times using Delayed Sweep The DELAY TIME MULT dial has been adjusted so the delayed sweep starts just before the area of interest 4 Inability to produce an intensified portion on the display indicates that the DLY D TRIG controls are incorrectly set or that the signal does not meet triggering requirements If the condition cannot be remedied with the DLY D TRIG controls or by increasing the displa...

Page 25: ... Be sure that both vertical and horizontal VARIABLE controls are set to CAL 11 Multiply the distance measured in Step 10 by the DLY D Time Division switch setting to obtain pulse jitter in time Example Assume that the horizontal movement is 0 5 division see Fig 1 18 and the DLY D Time Division switch is 5 microsecond Using the formula Pulse Jitter horizontal jitter X divisions DLY D Time Division ...

Page 26: ...r eight div all sweep rates Within 5 Within 7 Variable Sweep Rates Continuously variable between calibrated sweep rates Extends sweep rate to at least 12 5 s div Variable to at least 2 5 1 VARIABLE control internally switchable between var iable main sweep rates variable delayed sweep rates and variable main sweep holdoff Sweep Hold Off Hold off time may be varied by front panel VARIABLE control w...

Page 27: ...of main to delayed sweep Delayed Sweep Unchanged Variable Time Delay Delay Time Range 0 to 10 times DLY TIME DIV settings from 5 s div to 1 µs div Full scale is 10 times the TIME DIV OR DLY TIME setting Accuracy applies over the center eight major DELAY TIME MULT dial divisions Differential Delay Time Measurement Accuracy 15 Cto 35 C 5 s div to 1 s div Within 1 4 of measurement plus 0 3 of full sc...

Page 28: ...z to 10 MHz 100 10 MHz to 100 MHz 1 5 500 AC HF REJ 30 Hz to 50 kHz 0 3 100 DC DC to 10 MHz 0 3 100 10 MHz to 100 MHz 1 5 500 External Trigger Input Input R and C Approximately 1 MΩ paralleled by 20 pF Maximum Safe Input Voltage 500 V DC Peak AC 500 V peak to peak AC at 1 kHz or less Level Range EXT At least and 1 5 V EXT 10 At least and 15 V Internal Trigger Jitter 1 ns or less at 75 MHz 1 For In...

Page 29: ...hen operating in the INTEN DLY D SWP or MIXED Display Modes The DLY D TRIG SOURCE switch must be set to INT and P613 must be connec ted for Delayed Sweep Gate Out Amplitude into open circuit 3 0 V with baseline at 0 2 to 1 V Output Resistance Approximately 1 kΩ Loading At least 10 kΩ shunted by 100 pF or less Polarity Positive going Duration DISPLAY MODE INTEN DLY D SWP For the time that the delay...

Page 30: ...ciated oscilloscope manual Waveshape DISPLAY MODE MAIN SWP INTEN Sawtooth signal with slope determined by setting of the TIME DIV OR DLY TIME switch DLY D SWP Sawtooth signal with slope determined by the setting of the DLY D Time Division switch MIXED Composite sawtooth signal with slope determined by the setting of the TIME DIV OR DLY TIME switch during the main sweep portion of display and by th...

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