Tektronix 7B85 Manuale utente

Tektronix, Inc.

P.O. Box 500

Beaverton, Oregon 97077

INSTRUCTION

MANUAL

Serial Number

Scans

ArtekMedia

2006

First Printing,

DEC

1975

Scans

Artek

Media

Artek

Media

1042

Plummer

Cir

Rochester,

55902

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Dave

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Henderson

Artek

Media

1975

by Tektronix, Inc., Beaverton,

Oregon. Printed intheUnitedStatesof America. All

rights resewed.Contentsof thispublicationmaynot

be reproduced in any form without permission of

Tektronix, Inc.

U.S.A. and foreign TEKTRONIX products covered

U.S.

andforeignpatentsand/orpatentspending.

TEKTRONIX isaregisteredtrademarkof Tektronix,

Inc.

Scans

AttekMedia

2006

7B85

Operators

TABLE

CONTENTS

PAGE

LIST OF ILLUSTRATIONS

....................

LIST OF TABLES

...........................

SAFETY SUMMARY

........................

iii

SECTION

OPERATING INSTRUCTIONS

INSTALLATION

.....................

1-1

CONTROLS. CONNECTORS.

AND INDICATORS

....................

1-1

FUNCTIONAL CHECK

.................

1-1

Setup Procedure

....................

1-4

Sweep Functions

....................

1-4

NORMALSWEEP

.................

1-4

DELAYINGAND DELAYEDSWEEP

....

1-4

(DIFFERENTIAL)TIME

...........

1-5

Triggering Functions

.................

1-5

GENERAL OPERATING INFORMATION

....

1-6

Triggering Switch Logic

...............

1-6

Triggering Modes

....................

1-6

P-P AUTO

......................

1-6

AUTO

.........................

1-6

NORMAL

......................

1-6

SINGLE SWEEP

..................

1-6

Trigger Coupling

....................

1-7

...........................

1-7

AC LF REJ

.....................

1-7

AC HF REJ

.....................

1-7

...........................

1-7

Trigger Source

.....................

1-7

INTERNAL

.....................

1-7

PAGE

LINE

.........................

1-7

EXTERNAL

.....................

1-7

Trigger Slope

......................

1-7

Trigger Level

......................

1-7

...............

Horizontal Sweep Rates 1-9

..................

Time Measurement 1-9

Sweep Magnification

.................

1-9

...................

Variable Hold Off 1.10

................

Delay-Time Operation 1.10

...................

Time Operation 1.10

TIME OPERATION INA

DUAL-BEAMOSCILLOSCOPE

MAINFRAME

...................

1.12

Mainframe Operating Modes

............

1.12

APPLICATIONS

........................

1.13

DELAYED-SWEEP MEASUREMENTS

.......

1.13

Time-Interval Measurements

(Delay-TimeMode)

..................

1.13

Differential Time-Interval Measurements

Time Mode)

.....................

1.14

Delayed-SweepMagnification

...........

1.15

Triggered Delayed-SweepMagnification

.....

1.18

INDEPENDENT TIME-IIV'TERVAL

MEASUREMENTS

....................

1.18

SECTION

SPECIFICATION

STANDARD ACCESSORIES

...............

2-4

SECTION

INSTRUMENTOPTIONS

CHANGE INFORMATION

Scans

ArtekMedia

2006

7B85 Operators

FIGURE

NO.

Frontis-

piece

1-1

1-2

LIST OF ILLUSTRATIONS

PAGE FIGURE

NO.

7885 Features

....................

............

Locationof release latch. 1-1

Front-panelcontrols, connectors,

...................

and indicators. 1-2

Effectsof LEVELcontrol and SLOPE

switch on crt display

...............

1-8

Area of graticule used for most accurate

time measurements

................

1-9

Effect of sweep magnifier on crt display

1-9

(A)Delaying-sweepdisplay producedby

7885 in the A horizontal compartment.

(B) Delayed-sweepdisplay producedby

companion time-baseunit inthe B hori-

zontal compartment.

..............

.l-10

Typical

(differential)Time Operation.

.l-11

TABLE

NO.

PAGE

LIST OF TABLES

Measuringtime intervalsfrom

triggering

event (start of sweep) toany point on

.....................

waveform. .l-14

Measuring rise time, fall time, period,

frequency, or pulse width inthe

(dif-

..............

ferential) time mode .l-15

Magnifying

selected segment of the

delaying (A)sweep inthe delay-time

mode with mainframe alternate or

........

chopped horizontal operation .l-16

Time-interval measurementsin the

delay-time and

(differential)time

mode with mainframe alternate or

chopped operation.

...............

.l-17

Examiningan event that occurs within

aselected time interval after

known

.....

delay time in the delay-time mode .l-18

...........

7B85 dimensionaldrawing 2-4

PAGE

2-1 Electrical Characteristics.

............

2-1

2-2 Environmental Characteristics

.........

2-4

.............

2-3 PhysicalCharacteristics. 2-4

Scans

ArtekMedia

2006

7B85

Operators

SAFETY

SUMMARY

This manualcontains safety informationwhich the user must follow toensure safe operation of this instrument. WARIUING

information is intended to protect the operator, CAUTION information is intendedto protect the instrument. The following

are general safety precautionsthat must be observedduring all phases of operation.

Ground the Instrument

Toreduce electrical-shock hazard, themainframe (oscilloscope)chassis must beproperly grounded. Refer to the mainframe

manual forgrounding information.

Do NotOperate in Explosive Atmosphere

Donot operate this instrument in an area whereflammablegases or fumesare present. Such operation could cause an

explosion.

Avoid Live Circuits

Electrical-shock hazards arepresent in this instrument. Theprotective instrument coversmust notbe removed by operating

personnel. Component replacementand internal adjustments must be referred to qualifiedservicepersonnel.

Scans

ArtekMedia

2006

7B85

Operators

7685

Features

The 7B85 Delaying Time-Baseunit providescalibrated sweep rates from

seconds to 10 nanoseconds and triggering to400

megahertz for 7700-, 7800-, and 7900-seriesoscilloscopes. The XI0 Magnifier increases each sweep rate by afactor of 10

and a VARIABLE control allows continuously variable sweep rates betweencalibrated steps. Variable hold off and alpha-

numeric readout are provided. Also, when operating in the AUTO TRIGGERING MODE,

bright baseline trace

displayed

in the absence of atrigger signal.

Other features include independent sweep operation or continuously variable sweep delay (DELAYTIME) and differential

sweep delay

TIME) with acompanion time-base unit. Delay time or differential delay time readout is displayed on the

mainframe cathode-ray tube.

Scans

ArtekMedia

2006

Section

1-7B85

OPERATING INSTRUCTIONS

The 7885Time-Base unit operates with aTektronix 7700-, 7800-, or 7900-seriesoscilloscope mainframe and a 7A-series

amplifier unit to form acomplete oscilloscopesystem. This section describes the operation of the front-panel controls and

connectors, provides general operating information, a functional check procedure, and basic applications for this instrument.

IIVSTALLATION CONTROLS, CONNECTORS, AND INDICATORS

The time-baseunit is designed to operate in the horizontal All controls, connectors, and indicators required for the

plug-incompartment of the mainframe. This instrument operation of the time-base unit are located on the front

can also be installed in avertical plug-incompartment to panel. Figure 1-2shows and providesa brief description of

provide avertical sweep on the crt. However, when used in all front-panel controls, connectors, and indicators. More

this manner, there are no internal triggering or retrace detailed information is given in the General Operating

blanking provisions, and the unit may not meet the specifi- Instructions.

cations given in Section 2.

To install the unit in a plug-incompartment, push it in until

itfits firmly into the compartment. The front panel of the

unit should be flush with the front panel of the mainframe.

Even though the gain of the mainframe is standardized, the

sweep calibration of the unit should be checked when in-

stalled. The procedure for checking the unit

given under

Sweep Functions in the Functional Check procedure inthis

section.

To remove the unit, pull the release latch (see Figure 1-1)

todisengage the unit from the mainframe, and pull

out of

the plug-in compartment.

LEVEL

rwe

TRIGGERING

11'1

."TO

"El

Llll

$In

RELEASE

LATCH

FUNCTIONAL CHECK

The following procedures are provided for checking basic

instrument functions. Refer tothe description of the con-

trols, connectors, and indicators while performing this pro-

cedure. If performing the functional check procedure

reveals a malfunction or possible improper adjustment, first

check the operation of the associated plug-in units, then re-

fer to the instruction manual for maintenanceand adjust-

ment procedures.

Setup Procedure

1. Install the 7B85 inthe A horizontal compartment of the

mainframe.

2. Install an amplifier plug-in unit in avertical compart-

ment.

Set the 7B85 controls as follows:

SLOPE

MODE

COUPLING

SOURCE

B DELAY MODE

TRACE SEP

POSITION

TIMEIDIV

VARIABLE

(CAL IN)

HOLDOFF

MAG

(+)

P-P AUTO

INT

INDEPENDENT

OFF (fullyclockwise)

Midrange

Calibrated (Pushed in)

MIN (fully counter-

clockwise)

XI (pushedin)

Fig.

1-1.

Location of release latch.

Scans

ArtekMedia

2006

Operating Instructions-7B85

Fig.

1-2.

Front-panelcontrols, connectors, and indicators.

Scans

ArtekMedia

2006

Operating Instructions-7685

TRIGGERING

LEVELControl-Selects a pointonthetrigger signal where triggering occurs.

SLOPE Switch- Permits sweep tobetriggered onnegative- or positive-goingportionsof thetrigger signal.

READY Indicator-Illuminates when sweep circuit isarmed (SINGLE SWEEP Mode).

TRIG'D Indicator-Illuminates when thedisplay is triggered.

MODE Pushbuttons-Selects theoperating mode of the triggering circuits.

COUPLING Pushbuttons-Selects the method of coupling thetrigger signal totriggering circuit.

SOURCE Pushbuttons-Selects source of thetrigger signal.

SWEEP

POSITIONControl-Provides horizontal positioning.

FINEControl-Provides precise horizontal positioning.

HOLDOFF Control-Permits holdoff periodtobe varied toimprovetriggeringstability of repetitivecomplex waveforms.

MAG Pushbutton-Selects XI0magnifiedor unmagnified sweep.

TlMElDlV Switch-Selects thesweep rateof thesweep generator.

VARIABLE Control and CALSwitch-Selects calibrated or uncalibrated sweep rates. Uncalibratedsweep ratescan be

continuously reducedtoat least the sweep rateof the next slower position.

SWP CALAdjustment-Compensates for basic timing changes due tothedifferences insensitivity of mainframes inwhich

the

7885

may be used.

EXTERNAL TRIGGER INPUT

EXTTRIG ATTENUATOR-Selects attenuation factor for external trigger signals.

EXTTRlG INConnector-Connector (BNCtype1 provides input for external trigger signals.

SWEEP MODE

B DELAYMODE Pushbuttons-Selects independent or delaying sweep operation. Inthe B STARTSAFTER DLYand

B TRIGGERABLE AFTER DLYdelayingsweep modes, the DELAY TlME and

TlMEfunctions are activated. There

will be a

division vertical shift of thetrace when switchingfrom INDEPENDENTtoB STARTSAFTER DELAY.

DELAYTIME

DELAYTlME Control-Provides variable delay timebefore thestart of thedelayed sweep producedbycompanion time-

base unit.

TRACE SEP Controland Switch-Enables A TlME functions and provides vertical separation of thedelayed sweep

traces (A TIME operation,.

TlME Control-Provides differential timemeasurements between

selected intensified zones onthedelaying sweep

trace. Twodelayed sweep traces corresponding tothe intensified zones are displayed bythe companion time-base unit.

Differentialtime isdisplayed onthe crt readout.

Fig. 1-2. Front-panelcontrols, connectors, and indicators (cont.).

REV. A, APR.

1977

Scans

ArtekMedia

2006

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