Tektronix 7B70 Bedienungsanleitung

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TABLE OF CONTENTS

SECTION

SPEC1FlCATlONS

ntroduction

Electrical Characteristics

Sweep Rate

Sweep Accuracy

Sweep Length

Sweep Hold-Off Time

External Horizontal Amplifier

Deflection Factor

Frequency Response

Trigger Sensitivity

InternalTrigger Jitter

External Trigger Input

P-PAuto Sensitivity

Environmental Characteristics

Altitude

Physical Characteristics

Finish

Dimensions

Weight

SECTION

OPERATIIUG IIUSTRUCTIONS

General

nstallation

FrontPanel Controls

Test Setup Chart

General Operating Information

Sweep Calibration Check

Simplified Operating Instructions

Normal Sweep

Magnified Sweep

Delayed Sweep

Pushbutton Switch Logic

Triggered Light

Trigger Mode

Trigger Coupling

Trigger Source

Trigger Slope

Trigger Level

Horizontal Sweep Rate

Sweep Magnifier

Horizontal Position Control

Display Mode

Page

1-1

1-2

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TABLE OF CONTENTS

(cont)

SECTION

OPERATING INSTRUCTIONS (cont)

Applications

General

Frequency Comparison

Time Duration Measurements

Determining Frequency

Risetime Measurements

Delayed Sweep Time Measurements

Delayed Sweep Magnification

DisplayingComplex Signals Using Delayed Sweep

Pulse Jitter Measurements

X-Y

Phase Measurements

SECTION

CIRCUIT DESCRIPTION

ntroduction

Block Diagram Description

DetailedCircuit Description

Trigger Input

Trigger Amplifier

nput Stage

Peak Detector

Slope Comparator

Output Stage

Trigger Generator

Trigger Pulse Generator

Sweep Gate Stage

Triggered Hold-OffStage

Bright Line Auto

External Horizontal Amplifier

Time-BaseGenerator

General

NormalTrigger Mode Operation

Single Sweep Operation

Alternate Operation

Delayed Sweep Operation

Horizontal Preamp

Readout Block

SECTION

MAINTENANCE

PreventiveMaintenance

General

Cleaning

Visual Inspection

Transistor Checks

Recalibration

Page

2-13

2-14

2-15

2-16

2-17

2-18

2-19

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TABLE

CONTENTS

SECTION 4 MAINTENANCE (cont)

Troubleshooting

Troubleshooting Aids

Troubleshooting Equipment

Troubleshooting Techniques

Corrective Maintenance

Obtaining Replacement Parts

Soldering Techniques

Component Replacement

Instrument Repackaging

(cont)

Page

SECTION 5 PERFORMANCE CHECK/CALIBRATION

Introduction 5-1

Test Equipment Required 5-1

Short Form Procedure 5-2

PerformanceCheckICalibrationProcedure 5-4

General 5-4

PreliminaryControl Settings 5-4

CheckIAdjust Steps (referto Short-Form Procedure

for index to steps) 5-5

SECTION 6 ELECTRICAL PARTS LIST

Abbreviations and Symbols

Parts Ordering lnformation

lndex of ElectricalParts List

SECTION

DIAGRAMSAlUD MECHANICAL PARTS ILLUSTRATIOIUS

Diagrams

Mechanical Parts Illustrations

SECTlOlU

MECHAIUICALPARTS LIST

MechanicalParts List lnformation

lndex of MechanicalParts Illustrations

Mechanical Parts List

Accessories

CHANGE INFORMATION

Abbreviations and symbols used in this manual are based on or

taken directly from IEEE Standard 260 "Standard Symbols for

Units", MIL STD-12B and other standards of the electronics

industry. Change information, if any,

located at the rear of this

manual.

iii

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2006

RESET

Fig.

1-1.

7870

Time

Base.

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2006

SECTION

7870

SPECIFICATION

Change information, ifany,affecting thissection willbe foundat the rear of themanual.

Introduction

The 7B70 Time Base Unitis designed specifically for use

with Tektronix 7700-series oscilloscopes. However,

compatible with all 7000-series oscilloscopes. The 7B70

provides calibrated sweeps from 5 secondsldivision to0.02

microsecond/division. The XI0 MAGNIFlER extends the

calibrated sweep to 2 nanosecondsldivision. Sweep rates

may be varied continuously (uncalibrated) betweencalibra-

ted steps. Sweep triggering is to 200 megahertz or vertical

amplifier bandwidth, whichever is less. The 7B70 features

an external horizontal amplifier todisplay signals applied to

the EXT VOLTS INconnector. The sweep free-runsto pro-

vide a bright base line inthe absence of adequate triggering

signal in P-PAUTO and AUTO triggering modes.

The Performance Check Procedure given in Section 5

provides a convenient method of checking performance of

this instrument. The following electrical characteristics

apply over a calibration interval of 1000 hours or six

months (whichever occurs first) at an ambient temperature

O'C

to +50°C, unless otherwise noted. Warmup time for

given accuracy is 20 minutes.

TABLE

1-1

ELECTRICAL CHARACTERISTICS

Characteristic

Sweep Rate

Calibrated Range

VARIABLE Range

(uncalibrated)

Sweep Accuracy

Over Center

Divisions

5 s/div to 1sldiv

0.5 sldiv to

0.02 psldiv

Over any 2 Division

IntervalWithin Cen-

ter

Divisions

Exclude Following 1-startof Sweep.

Characteristic Performance

Performance

5 seconds/division to 0.02 micro-

secondldivision ina 1-2-5sequence.

XI0 magnifier extends sweep rate

to2 nanosecondsldivision.

Continuously variable between cali-

brated sweep rates. Extends uncali-

brated sweep rate to at least 12.5

secondsldivision.

Measured in 7700-series oscillo-

scope.

Sweep Length

10.5 divisions to 13divisions.

Portionsof Magni-

fied Sweep End of Sweep.

+15'~to+35'~

Sweep Hold-OffTime

5 sldiv to5 psldiv

O'C

to+50'~

Unmag

External Horizontal

Amplifier

1.5 times the TIMEIDIVISION set-

ting or less.

2psldiv to

0.02 psldiv

Unmag

Mag

3.5%

2.5%

Deflection Factor

EXT

VARIABLE

Fully Clock-

wise

3.5 microsecondsor less.

Mag

VARIABLE

Fully Clock-

wise

25 millivolts/division within 5 milli-

voltsldivision.

250 millivolts/division within 50

millivolts/division.

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2006

VARIABLE

Range Atleast10:I

1-1

TABLE

1-1

(cont) TABLE

1-1

(cont)

Characteristic

ExternalTrigger lnput

Performance Characteristic

Frequency

Response

Performance

System -3 dB points in7700-series

oscilloscope.

lnput Rand C

Maximum lnput

Voltage

1megohm within 2%, 20 picofarads

within 2 picofarads.

500 volts (DC

Peak AC). 500

volts (P-PAC) at 1kilohertz or less.

Level Range

(ExcludingP-P

AUTO)

EXT

EXT+ 10

-----

100kilohertz

Trigger Sensitivity

Triggering

Minimum Trig- At least +1.5 volts to-1 5 volts.

Frequency

~an~e' At least +15 volts to-15 volts.

geringSignal

Required

P-P AUTO Operation

Sensitivity

Coupling

INT

7;;v

30 Hz to 20 MHz 0.3 div 0.5 div Internal, 125 millivolts Ex-

ternal, 200 Hz to 20 MHz. Upper

frequency and amplitude limits

same as NORMAL Trigger Sensiti-

vity.

20 MHz to

200 MHz

20 MHz Low Frequency Must Trigger on 50 hertz, 2division

Response signal.

AC HF REJ I30Hz to 50 kHz 10.3div

75 mV

DC to 20 MHz 10.3div

75 mV

I I

TABLE

1-2

ENVIRONMENTAL CHARACTERISTICS

275 mV

20 MHz to

200 MHz

Thisinstrument will meet the electrical characteristics

given in Table

over the following environmental

limits.

1.5 div

'On lnternal Triggering Only; the

specified upper -3 dB frequency

of the Vertical System replaces

upper limit frequencies in the

above table when the number in

the table

greater than the -3 dB

frequency of the Vertical System. Non-operating

To 50,000 feet and -55O~.

Characteristic

Altitude

'will not trigger on sine waves of 3

divisions or less internal or 1.5

volts external below 120Hz.

Performance

TABLE

1-3

PHYSICALCHARACTERISTICS

sweep generator produces one Finish

sweep only. Dimensions

Single Sweep

Front panel

anodized aluminum.

14.583 inches long by 2.75 inches

wide by 5 incheshigh.

Triggering requirements same as

normal sweep. When triggered,

lnternal Trigger Jitter

Characteristic

1 nanosecond or less at 150 mega-

Performance

hertz. Weight

Approximately 2.88 pounds.

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2006

Operating Instructions-7670

SECTION

OPERATING INSTRUCTIONS

Change information,

any, affecting thissection

will

be foundat therear of themanual.

General

The 7B70 plug-in unit operates with a Tektronix

7000-series indicator oscilloscope and a 7A-seriesvertical

plug-in unit to form a complete oscilloscope system. To

effectively use the 7B70

its

operation and capabilities

should be known. This section describes the operation of

the front-panel controls, gives first-time and general opera-

ting information and

lists

some basic applications for this

instrument.

Installation

The 7B70

designed to operate inthe horizontal plug-in

compartments of Tektronix 7000-seriesoscilloscopes. The

7B70 can also be installed inavertical plug-incompartment

to provide a sweep that runs vertically on the CRT. How-

ever, when used in this manner, there is no retraceblanking

or internal triggering provision and the unit may not meet

the specifications given in Section

The instructio,~~in

this manual are written for use of the 7870 inahorizontal

plug-incompartmentof the oscilloscope.

When the 7B70

used with an oscilloscope which has

two horizontal plug-incompartments, install this unit in the

B (right) compartment. Then, if a delaying-sweep unit is

installed-inthe A (DELAYINGTIME BASE)compartment,

delayed-sweepoperation

available. The

7B70

will operate

AND

COUPLING.

Release

Latch

VARIABLE

Fig.

2-1.

Location of release latch.

properly in the A compartment for all horizontal modes of

operationexcept delayingsweep.

To install the 7870 into a plug-in compartment, push

in until

fits firmly into the indicator plug-in compart-

ment. To remove, pull the release latch (see Fig.

2-1)

disengage the unit from the indicator and pull

out of the

plug-in compartment. Even though the horizontal gain of

the indicator oscilloscope

standardized to minimize ad-

justment when insertingplug-inunits, the sweep calibration

of the 7B70 should be checked when

insertedintothe

indicator to verify measurement accuracy. The procedure

for checking the unit

given under Sweep Calibration

Check in this section.

FRONT-PANELCONTROLS

General

All controls required for the operation of the 7B70 are

located on the front panel of the unit (see Fig.

2-2).

make full use of the capabilities of this instrument, the

operator should be familiar with the function and use of

each of these controls.

brief description of the front-

panel controls and connector

given here. More detailed

information

given under General Operating Information.

Triggering Controls

LEVELISLOPE Selects the amplitude point and

slope of trigger signal on which the

sweep is triggered. When the indica-

tor line on the outer ring is to the

left of center, the sweep is triggered

on the positive-going slope of the

trigger signal, as shown by the

positive-going waveform. To the

right of center, the sweep

trig-

gered on the negative-goingslope of

the trigger signal as shown by the

negative-goingwaveform.

TRIG'D Light indicates that the sweep

triggered and will produceadisplay

with correct setting of the POSI-

TION control and the controls on

the associated vertical unit and indi-

cator oscilloscope.

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2006

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