Tektronix 7S12 Bedienungsanleitung

Tektronix, Inc.

P.O. Box 500

Beaverton, Oregon

070-1244-00

Product Group 42

Ibktronix-

COMMITTED TO EXCELLENCE

PLEASE CHECK FOR CHANGE INFORMATION

AT THE REAR OF THIS MANUAL.

7S12

TDR/SAMPLER

S/N B020000-UP

INSTRUCTION MANUAL

97077 Serial Number

First Printing NOV 1971

Revised MAR 1985

Contents of this publication may not be reproduced in any

form without the written permission of Tektronix. Inc.

Products of Tektronix, Inc. and its subsidiaries are covered

by U.S. and foreign patents and/or pending patents.

TEKTRONIX, TEK, SCOPE-MOBILE, and are

registered trademarks of Tektronix, Inc. TELEQUIPMENT

is aregistered trademark of Tektronix U.K. Limited.

Printed in U.S.A. Specification and price change privileges

are reserved.

INSTRUMENT SERIAL NUMBERS

Each instrument has aserial number on apartel insert, tag,

or stamped on the chassis. The first number or letter

designates the country of manufacture. The last five digits

of the serial number are assigned sequentially and are

unique to each instrument. Those manufactured in the

United States have six unique digits. The country of

manufacture is identified as follows:

BOOOOOO Tektronix, Inc., Beaverton, Oregon, USA

100000 Tektronix Guernsey, Ltd., Channel Islands

200000 Tektronix United Kingdom, Ltd., London

300000 Sony/Tektronix, Japan

700000 Tektronix Holland, NV, Heerenveen,

The Netherlands

7S12

TABLE OF CONTENTS

SECTION 1CHARACTERISTICS Page SECTION 4MAINTENANCE (cont) Page

Description 1-1 Readout Symbol Adjustment

Electrical Characteristics 1-1 C> and <3 4-2

Physical Characteristics 1-5 Repackaging for Shipment 4-3

Environmental Characteristics 1-5

SECTION 5PERFORMANCE

SECTION 2OPERATING INSTRUCTIONS CHECK/ADJUSTMENT

General Information 2-1 Introduction 5-1

Installation 2-1 Equipment Required 5-1

Controls and Connectors 2-1 Performance Check and Adjustment

First Time Operation 2-5 Record and Index 5-2

Voltage Reflection Coefficient 2-7 7S12 Checks 5-3

Impedance Scale Overlays 2-8 S-6, S-52 and 7S12 System Checks 5-5

Time or Distance Measurements 2-8 S-5, S-54 and 7S12 System Checks 5-7

High Resolution 2-11 Adjustment Procedure 5-9

Single Sweep Operation 2-11

PRESET Calibration 2-12

Application Connections 2-12 SECTION 6ELECTRICAL PARTS LIST

Using TDR Slide Rule 2-14

SECTION 7DIAGRAMS AND CIRCUIT BOARD

ILLUSTRATIONS

SECTION 3CIRCUIT DESCRIPTION Symbols and Reference Designators

Introduction 3-1 Schematic Diagrams and Component

Vertical Circuits Block Diagram 3-1 Board Locations

Horizontal Circuits Block Diagram 3-4

Circuit Description 3-10

SECTION 8MECHANICAL PARTS LIST

SECTION 4MAINTENANCE Mechanical Parts List

Mechanical Parts List IllustraTron

Introduction 4-1 Accessories

Lubrication 4-1

Troubleshooting 4-1

Tape Dial Removal 4-2

Tape Dial Installation 4-2

Tape Dial Alignment 4-2

Revised NOV 1984 I

fIMC

DC OFFStT *1V TtMt/OIV

mVOlTS/OIV

SaSAMPLINO HEAD

Fig. 1-1. 7S12 TDR/Sampler unit,

SECTION 1

CHARACTERISTICS

Description

The 7S12 is adual-purpose plug-in unit for measurement

of recurring fast-rise signals or for time-domain

reflectometry. It occupies two compartments (one vertical

input and one horizontal input) of aTektronix 7000-series

oscilloscope.

The 7S12 has two compartments for plug-in heads. The

left-hand compartment (labeled SAMPLING on the 7S12

front panel) accepts Tektronix S-series Sampling Heads.

The type of sampling head selected determines the vertical

input characteristics of the 7S12. The right-hand compart-

ment (labeled PULSE GENERATOR) accepts S-series pulse

generators, trigger recognizers or trigger count-down heads.

The 7S12 has the following features: The vertical de-

flection factors, i.e., millivolts/div and millirho/div, are

from 2to 500 in a1-2-5 sequence. The time/div is cali-

brated from 20 ps/div to 1ys/div in a1-2-5 sequence. The

DC OFFSET control offsets the display in a±1 Vrange.

The HI RESOLUTION switch reduces the waveform noise

and jitter by signal averaging with acorresponding re-

duction of sweep rate. The LOCATE switch increases the

time/div and intensifies aportion of the display to locate

the time window relative to the total waveform. Front

panel outputs include OFFSET OUT (±10 Vrange),

VERTical SIGnal OUT and SWEEP OUT. Modes of sweep

operation include SINGLE sweep, REPetitive sweep,

MANual scan and EXTernal sweep IN.

The TIME-DISTANCE scale is calibrated for round-trip

time measurements of 0to 10 ys and one-way distance

measurements up to 4900 feet (1500 meters) air dielectric

or 3200 feet (975 meters) polyethylene dielectric. The

POLY scale may be calibrated for transmission lines which

have avelocity of propagation equal to or greater than that

of polyethylene. The Time-Distance scale may be ordered

with distance calibrated in metric units.

SECTION 1

ELECTRICAL CHARACTERISTICS

Characteristic Performance Requirement Supplemental Information

Deflection Factor

Accuracy Within 3%

Range 2units/div to 500 units/div irt a1-2-5

sequence. Units/div are labeled on the

sampling head.

Units/Div VARIABLE Range 'Provides continuous coverage from 1

to 770 units/div (mV or mp)

pCAL Range Allows calibrated reflection coefficient

(p) with pulse generators supplying

from 200 mV to 1Vpulse amplitude.

DC OFFSET Range Offsets display at least -M Vto —1 V.

OFFSET OUT

Range At least -MO Vto -10 V. OFFSET

OUT =10X (DC OFFSET) within 2%

Source Resistance 10 kfi within 1%

Characteristics—7S 1

Characteristic Performance Requirement Supplemental Information

VERTical SIGnal OUT

Amplitude 200 mV/div of signal display within

VARIABLE control must be in CAL

position.

Source Resistance 10 within .5%

SWEEP OUT

Amplitude 1V/div of horizontal deflection within

Range 0Vto greater than 10V

Source Resistance 10 kfi within 1%

TIME/DIV

Accuracy Within 3%

Range 20 ps/div to 1ps/div in a1-2-5

sequence

Time/Div VARIABLE Range Provides continuous coverage to at

least 8ps/div.

Display Modes

SINGLE Sweep Each sweep is initiated by pushing and

releasing the START button.

REPetitive Sweep Normal resolution: sweep rate is

continuously variable from at least 1

sweep in 20 ms to less than 1sweep in

5s.

HI RESOLUTION: sweep rate is con-

tinuously variable from at least 1

sweep in 200 ms to less than 1sweep

in 50 s.

MANual Sweep Any portion of the display may be

observed by manual operation of the

SCAN control.

EXTernal Input

Deflection Factor 1V/div within 5% to at least 15 V/div

Input Resistance 100 kfi within 10%

Maximum Input Voltage 150 V(DC +peak AC)

FINE (ZERO SET) Range Moves an unmagnified waveform at

least .9 div.

1-2

Characteristics—7S 1

ELECTRICAL CHARACTERISTICS

SYSTEM PERFORMANCE WITH S-6 AND S-52

Characteristic Performance Requirement Supplemental Information

Risetime 35 ps or less for the incident step, 45 ps

or less for the displayed reflection from a

short-circuited 1ns test line

Pulse Amplitude At least +200 mV into 50 0,

Input Impedance Nominal 50

Jitter Less than 10 ps (without signal averaging)

Aberrations Not more than +7%, —7%, total of 10%

P-P within the first 1.8 ns of the step edge

with the reference level at 1.8 ns from the

step edge; not more than +2%, —2%, total

of 4% P-P after 2.5 ns from the step edge

with the reference level at 0.3 ps from the

step edge.

TIME-DISTANCE Scale Time scale indicates round-trip time.

Distance scales (AIR and POLY

dielectrics) indicate one-way distance.

The usable TIME-DISTANCE ranges

for TDR measurements are limited by

the S-52 pulse duration.

Accuracy TIME scale within 1% of full scale. Distance scales are calibrated for the

nominal velocity of propagation of the

AIR and POLY dielectrics.

TIME-DISTANCE Multiplier

X.1 XI X10

TIME Range .1 ps 1AS lOps

Maximum of about 150

ns one-way cable delay.

AIR Dielectric Distance 49 feet 490 feet 4900 feet

Range 15 meters 150 meters 1500 meters

Maximum of about 150

feet (46 meters) cable

length.

POLY Dielectric Distance

Range

32 feet 320 feet 3200 feet

9.75 meters 97.5 meters 975 meters

Maximum of about 100

feet (30 meters) cable

length.

1-3

Characteristics—7S 12

Characteristic Performance Requirement Supplemental Information

PRESET Permits the calibration of the POLY

scale for dielectrics having avelocity

of propagation between those of poly-

ethylene and air.

Characteristic

Risetime

Pulse Amplitude

Input Impedance

Jitter

Aberrations

TIME-DISTANCE Scale

Accuracy

TIME Range

ELECTRICAL CHARACTERISTICS

SYSTEM PERFORMANCE WITH S-5 AND S-54

Performance Requirement

1.5 ns or less for the displayed reflection

from ashort-circuited test line

At least -t400 mV into 50

Less than 20 ps (without signal averaging)

Not more than -r4%, —6%, total of 10%

P-P within the first 17 ns of the step: not

more than +1.5%, —1.5%, total of 3%

after 17 ns.

TIME scale within 1% of full scale.

Supplemental Information

Nominal 50 ^2

Time scale indicates round-trip time.

Distance scales (AIR and POLY

dielectrics) indicate one-way distance.

TDR events out to 20 /ts (round-trip

time) may be viewed. This corresponds

to 9800 feet (3000 meters) in AIR

dielectric and to 6400 feet (1950

meters) in POLY dielectric. This

distance is the sum of the displayed

time window (10 ps maximum) and

the TIME scale readout (10 ps maxi-

mum).

Distance scales are calibrated for the

nominal velocity of propagation of the

AIR and POLY dielectrics.

TIME-DISTANCE Multiplier

X.1 XI X10

.1 ps 1ps 10 ps

An additional time range may be

viewed.

1-4

Characteristics—7S 12

Characteristic Performance Requirement Supplemental Information

AIR Dielectric Distance

Range

49 feet 490 feet 4900 feet

15 meters 150 meters 1500 meters

An additional distance range may be

viewed (in terms of time).

POLY Dielectric Distance

Range

32 feet 320 feet 3200 feet

97.5 meters 9.75 meters 975 meters

An additional distance range may be

viewed (in terms of time).

PRESET Permits the calibration of the POLY

scale for dielectrics having avelocity

of propagation between those of poly-

ethylene and air.

PHYSICAL CHARACTERISTICS

Characteristic Performance Requirement

Finish Anodized aluminum front panel

Weight

Net 4.7 lb

Domestic Shipping 7.2 lb

Export Packed 11.7 lb

Dimensions

Length (ex-

cluding knobs) 13.383 in

Width 5.464 in

Height 4.988 in

ENVIRONMENTAL CHARACTERISTICS

Characteristic Performance Requirement

Temperature

Operating 0°C to -t50°C

Non-operating -40°C to -i-65°C

ENVIRONMENTAL CHARACTERISTICS (cont)

Characteristic Performance Requirement

Altitude

Operating To 15,000 feet

Non-operating To 50,000 feet

Vibration

Operating 0.025 in P-P displacement at 55 Hz

Shock

Operating To 20 g's, 1/2 sine, 11 ms duration

Humidity

Non-operating

and Operating 5cycles (120 hours) to 95% relative

humidity referenced to

MIL-E-16400F (Paragraph 4.5.9

through 4.5. 9.5.1, Class 4)

Transportation Qualifies under National Safe

Transit Committee test procedure

1A, Category II

1-5

7S12

SECTION 2

OPERATING INSTRUCTIONS

General Information

This section of the manual provides the basic infor-

mation required for operation of the 7S12 TDR/Sampler

including installation, front panel information, and First

Time operation instructions.

The 7S12 is acombined horizontal and vertical,

double width sampling unit for use in any 7000-series

Oscilloscope. The 7S12 accepts two plug-in heads, a

sampling head and agenerator head, which determine

the characteristics of the TDR system. If atrigger recog-

nizer head such as the S-53 is used in the 7S12 gener-

ator head compartment, general purpose sampling can be

accomplished using the S-53 to trigger the 7S12 sweep.

INSTALLATION

The 7S12 can be powered by any Tektronix 7000-

series Oscilloscope. Since the 7S12 is acombined hori-

zontal and vertical unit, it must be installed in the

center two compartments of a7000-series Oscilloscope

containing 4 compartments, or into the right two com-

partments of a7000-series Oscilloscope containing 3

compartments. Avertical unit such as a7S11 can be

installed in the left compartment of either Oscilloscope

for dual-trace operation. Then J641 (a fixed shoe

connector) provides astrobe connection to the 7S1 1.

Three methods of installation are shown in Fig. 2-1.

Part Ashows the 7S12 installed in the center two com-

partments of a7504 Oscilloscope. The 7S11 and samp-

ling heads are shown for TDR and dual-trace use. Part

Bshows the 7S12 installed with the 7S11, 7M11, and

sampling heads for General Purpose Sampling and dual-

trace use. Part Cshows the 7S12 installed with the

7S11 and sampling heads in the 7403N (or 7503)

3-compartment Oscilloscope for TDR and dual-trace use.

For General Purpose sampling, use the 7M11 outside the

Oscilloscope, and the sampling heads as shown for

installation B.

Installing the 7S12 in the Oscilloscope

Insert the 7S12 into avertical and ahorizontal com-

partment of a7000-series Oscilloscope (See Fig. 2-1).

Slide the 7S12 completely into the two compartments.

The 7S12 will lock into place with aspring loaded latch

knob.

To install ahead into one of the two 7S12 compart-

ments, insert the head into the compartment with the

latch knob free to move until completely in the 7S12.

Then push the latch to lock the head in place. To

remove, pull the latch knob away from the panel, then

pull the unit from the 7S12.

Mating

The 7S12 vertical output amplifier gain must be

matched to the oscilloscope deflection factor for

accurate gain measurements. The VERT GAIN control, a

screwdriver adjustment on the front panel, adjusts the

vertical output amplifier gain of the 7S12. Adjustment

of this VERT GAIN control using the Oscilloscope Cali-

brator as asignal source is shown under First Time

Operation in this section of the manual.

The 7S12 horizontal gain must be matched to the

horizontal deflection factor of the oscilloscope. Hori-

zontal gain is set by the SWEEP CAL adjustment lo-

cated on the 7S12 front panel. The adjustment is made

for full rotation of the SCAN control for 10 divisions

with the MAN button pushed in. The HORIZ POS

adjustment is used to position the spot on the CRT.

The HORIZ POS control is also located on the front

panel. The adjustment method is discussed in First Time

Operation.

CONTROLS AND CONNECTORS

Abrief description of the function and operation of

the controls and connectors of the 7S12 follows. Fig.

2-2 shows the 7S12 front panel with asampling head

and apulse generator installed.

Vertical Section

DC OFFSET ±1 VPositions the display vertically by

applying an internal offset voltage

REV. B, JULY, 1976 2-1

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