Tektronix SD-42 User Manual

User Manual

SD-42 & SD-46
Optical to Electrical Converter Heads

070-8671-01

Copyright E T ektronix, Inc. 1992. All rights reserved.
T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes

that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.

WARRANTY

T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a product proves defective during this warranty period, T ektronix,
at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by T ektronix, with shipping charges prepaid.
T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
T ektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than T ektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction
caused by the use of non-T ektronix supplies; or d) to service a product that has been modified or integrated with other
products when the effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
REP AIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO
THE CUSTOMER FOR BREACH OF THIS WARRANTY . TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.

Table of Contents

Getting Started

Operating Basics

Reference

List of Figures ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Tables ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connector Care 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connecting Signals 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mean Power Monitor 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Buttons and Lights 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Check 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using This Procedure 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Initialized and Stored Settings 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Menu Selections and Measurement T echniques 3–2. . . . . . . . . . . . . . . . . . . . . .

Limits and T olerances 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optical Power Monitor Check 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pulse Amplitude and Pulse Width Check 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendices

Index

SD-42 & SD-46 User Manual

Appendix A: Accessories A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard Accessories A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix B: Specifications B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SD-42 Characteristics B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SD-46 Characteristics B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix C: Replaceable Parts C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts Ordering Information C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Replaceable Parts List C–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

i

Table of Contents

List of Figures

Figure 1–1: Sampling Head Compartments in a CSA 803

Communications Signal Analyzer 1–3. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–1: SD-42 Front Panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–1: Setup to Check Optical Power Monitor Operation 3–3. . . . .

Figure 3–2: Setup to Check Pulse Width and Pulse Amplitude 3–4. . . . .

Figure B–1: SD-42 Frequency Response Curve B–5. . . . . . . . . . . . . . . . . .

Figure B–2: SD-42 Responsivity vs. Wavelength Curve B–5. . . . . . . . . . .

Figure B–3: SD-46 Frequency Response Curve B–6. . . . . . . . . . . . . . . . . .

Figure B–4: SD-46 Responsivity vs. Wavelength Curve B–6. . . . . . . . . . .

Figure C–1: Replaceable Mechanical Parts C–4. . . . . . . . . . . . . . . . . . . . .

List of Tables

Table 3–1: Test Equipment Required 3–1. . . . . . . . . . . . . . . . . . . . . . . . . .

Table B–1: SD-42 Optical-to-Electrical Converter Head Pulse

Characteristics B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table B–2: SD-42 Optical-to-Electrical Converter Head Power Meter

Characteristics B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table B–3: SD-42 Optical-to-Electrical Converter Head Environmental

and Mechanical Characteristics B–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table B–4: SD-46 Optical-to-Electrical Converter Head Pulse

Characteristics B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table B–5: SD-46 Optical-to-Electrical Converter Head Power Meter

Characteristics B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table B–6: SD-46 Optical-to-Electrical Converter Head Environmental

and Mechanical Characteristics B–4. . . . . . . . . . . . . . . . . . . . . . . . . . .

ii

SD-42 & SD-46 User Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.

Only qualified personnel should perform service procedures.

While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.

Injury Precautions

Ground the Product

Do Not Operate in

Explosive Atmosphere

This product is indirectly grounded through the grounding conductor of the
mainframe power cord. To avoid electric shock, the grounding conductor must
be connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.

To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.

Safety Terms and Symbols

Terms in This Manual

These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.

Terms on the Product

SD-42 & SD-46 User Manual

These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the

marking.

iii

General Safety Summary

WARNING indicates an injury hazard not immediately accessible as you read the
marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product

The following symbols may appear on the product:

DANGER

High Voltage

Protective Ground

(Earth) T erminal

ATTENTION

Refer to

Manual

Double

Insulated

iv

SD-42 & SD-46 User Manual

Getting Started

Getting Started

The SD-42 Optical-to-Electrical Converter Head and SD-46 Optical-to-Electrical
Converter Head are high-performance optical heads for use in the 11800 Series
Digital Sampling Oscilloscopes (including the SM-11 Multi-channel Unit) and
the CSA 803 Communications Signal Analyzer. The SD-42/SD-46 Optical-to­Electrical Converter Heads are used with SD-22, SD-24, and SD-26 Sampling
Heads. The SD-42/SD-46 converts an optical signal into an electrical signal
which serves as the input to an SD Series Sampling Head.

The SD-42 Optical-to-Electrical Converter Head provides the following features:

H DC to 6.4 GHz optical bandwidth
H ≤55 ps optical impulse response (FWHM) with the SD-24 and SD-26,

≤60 ps optical impulse response (FWHM) with the SD-22

H 1000 nm to 1700 nm Spectral Response
H Mean Optical Power Monitor function

The SD-46 Optical-to-Electrical Converter Head provides the following features:

H DC to 20 GHz optical bandwidth
H ≤28.5 ps optical impulse response (FWHM) with the SD-24 and SD-26
H 1200 nm to 1650 nm Spectral Response
H Mean Optical Power Monitor function

SD-42 & SD-46 User Manual

1–1

Getting Started

Connector Care

The front of the SD-42/SD-46 Optical-to-Electrical Converter Head has a
precision 3.5 mm connector for attaching the optical head electrical signal output
to the lower input connector of an adjacent SD-24 or SD-26. These are high-pre­cision connectors with a higher mechanical tolerance than standard SMA
connectors. Never attach a cable to a plug-connector if the cable has a worn or
damaged connector — damage may result.

Use extra care when attaching or removing a cable from the connectors. Turn
only the nut, do not turn the cable. When attaching a cable to the Optical-to­Electrical Converter Head, align the connectors carefully before turning the nut.
Use light, finger pressure to make this initial connection. Then tighten the nut
lightly with a wrench.

For best repeatability and to prolong the life of connectors, use a torque wrench
and tighten the connection to the range of 7–10 lb-in (79–112 N-cm).

The front of the SD-42/SD-46 has a precision FC/PC optical connector
receptacle. This is for attaching a fiber optic signal cable. This connector
receptacle has a locating keyway. To ensure repeatable connections, it is
important to align this keyway on the connector and connector receptacle before
tightening the nut. The nut should be tightened with light, finger pressure only.
The connector receptacle must be kept free of dirt and dust. The cover cap should
be replaced whenever the unit is not in use or a fiber is not connected.

1–2

SD-42 & SD-46 User Manual

Installation

Getting Started

The SD-42/SD-46 Optical-to-Electrical Converter Head fits into the front panel
of an 11800 Series Digital Sampling Oscilloscope or a CSA 803 Communica­tions Signal Analyzer. See Figure 1–1.

The SD-42/SD-46 Optical-to-Electrical Converter Head converts optical signals
to electrical signals to be sampled. At least one sampling head must be installed
in the oscilloscope for the instrument to sample signals.

For the converted output signal from the SD-42/SD-46 to be sampled, the output
of the SD-42/SD-46 must be connected to the input of an SD-24 or SD-26
Sampling Head (the SD-42 can also be connected to an SD-22). To accomplish
this using the U-link provided with the SD-42/SD-46, the SD-24 or SD-26 must
be in the plug-in slot immediately to the right of the slot occupied by the SD-46.
The output of the SD-42/SD-46 is then connected to the lower input of the
SD-24 or SD-26.

To install a plug-in, first switch off the oscilloscope. Then place the plug-in in a
compartment and slowly push it in with firm pressure. Once the plug-in is
seated, turn the screw shaft on the plug-in to tighten the plug-in in place.

Sampling Head

Compartments

SD-42/SD-46
SD-24/SD-26

Figure 1–1: Sampling Head Compartments in a CSA 803 Communications Signal
Analyzer

SD-42 & SD-46 User Manual

1–3

Getting Started

1–4

SD-42 & SD-46 User Manual