Tektronix A6906S User Manual
User Manual
A6906S Fiber-Optic Isolation System
070-8900-04
Copyright E T ektronix, Inc. 1993. 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 this product will be free from defects in materials and workmanship for a period of one (1)
year from the date of shipment. If any such 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. Tektronix 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; or c) 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 WITH RESPECT TO THIS PRODUCT IN LIEU OF
ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS
DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
P ARTICULAR 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, INCIDENT AL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF
WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF
SUCH DAMAGES.
EC Declaration of Conformity
We
Tektronix Holland N.V.
Marktweg 73A
8444 AB Heerenveen
The Netherlands
declare under sole responsibility that the
A6906S Fiber Optic Isolation System
meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Compliance was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EN 55011 Class A Radiated and Conducted Emissions
EN 50081-1 Emissions:
EN 60555-2 AC Power Line Harmonic Emissions
EN 50082-1 Immunity:
IEC 801-2 Electrostatic Discharge Immunity
IEC 801-3 RF Electromagnetic Field Immunity
IEC 801-4 Electrical Fast Transient/Burst Immunity
Table of Contents
List of Figures iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables iv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Injury Precautions v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Damage Precautions vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Terms and Symbols vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Support x. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Power 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging the Battery Pack 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing for Operation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power On and Calibration 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional T emperature Calibration 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Fiber-Optic Cable Connectors 11. . . . . . . . . . . . . . . . . . . . . . . .
Programming 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Up 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Requirements 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting GPIB Parameters 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Documents You Will Need 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commands 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CALibration 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COUpling 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVEnt? (Query Only) 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HELp? (Query Only) 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ID? (Query Only) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INIt (No Query Form) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRObe? (Query Only) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RANge 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RQS 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SET? (Query Only) 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STAndby 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRAns? (Query Only) 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TESt? (Query Only) 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Bytes and Event Codes 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6906S Fiber-Optic Isolation System User Manual
i
Table of Contents
Appendix A: Specifications 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Performance Verification 27. . . . . . . . . . . . . . . . . . . . . . . . .
Prerequisites 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required T est Equipment 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset and Noise Check 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time Check 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth Check 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gain Check 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Check 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: GPIB Interface Messages 37. . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: Maintenance 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Fuses 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Probe 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Compensation 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Fiber-Optic Cable 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Panel Removal 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fiber-optic Cable Removal 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fiber-optic Cable Installation 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Panel Installation 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix E: Replaceable Parts List 53. . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
A6906S Fiber-Optic Isolation System User Manual
List of Figures
Table of Contents
Figure i: Power-Cord Plug Options viii. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1: A69T06 Battery Removal 2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2: Battery Charging 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3: A6906S Connections for Use 3. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4: Connection of the Fiber-Optic Cable and Connector 4. . . . .
Figure 5: A69R06 Receiver Controls 9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6: 6-Inch Ground Lead Clip 10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7: Fiber-Optic Cable and Connector Cleaning 11. . . . . . . . . . . .
Figure 8: Stacked GPIB Connectors 13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9: Typical GPIB Network Configuration 14. . . . . . . . . . . . . . . . .
Figure 10: Noise Check Setup 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 11: Rise Time Check Setup 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 12: Bandwidth Check Setup 31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 13: Gain Check Setup 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 14: Probe Check Setup 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 15: Replacing the probe 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 16: Removing the Panel 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 17: Fiber-optic Cable Installation (for Type A) 49. . . . . . . . . . . .
Figure 18: Connection of the Fiber-optic Cable and Connector 50. . . . .
Figure 19: Fiber-optic Cable Installation (for Type B) 51. . . . . . . . . . . .
Figure 20: Replaceable Parts 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 21: Accessories 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6906S Fiber-Optic Isolation System User Manual
iii
Table of Contents
List of Tables
Table i: A6906S Order Options viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1: A6906S Attenuation Factors with Probe Factor Included 9. .
Table 2: A6906S GPIB Commands 16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3: Status Bytes 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4: Event Codes 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5: Electrical Specifications 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6: Fiber-Optic Cable Characteristics 25. . . . . . . . . . . . . . . . . . . . .
Table 7: Battery Characteristics 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 8: Physical Characteristics 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 10: GPIB Interface Functions 26. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 11: Test Equipment Required for Performance Verification 28. .
Table 12: Gain Accuracy Limits 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 13: Available Fiber-Optic Cables 46. . . . . . . . . . . . . . . . . . . . . . . .
Table 14: Fiber-Optic Cable Changes Requiring Recalibration 46. . . .
iv
A6906S Fiber-Optic Isolation System 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.
Injury Precautions
Use Proper Power Cord
Avoid Electric Overload
Do Not Operate Without
Covers
Do Not Operate in
Wet/Damp Conditions
Ground the Product
Use Proper Fuse
Do Not Operate in
Explosive Atmospheres
To avoid fire hazard, use only the power cord specified for this product.
To avoid electric shock or fire hazard, do not apply a voltage to a probe that is
outside the range specified for that probe.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
To avoid electric shock, do not operate this product in wet or damp conditions.
Portions of this product are grounded through the grounding conductors of the
power cords. 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 fire hazard, use only the fuse types and ratings specified for this
product.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
Wear Eye Protection
A6906S Fiber-Optic Isolation System User Manual
Wear eye protection if exposure to high-intensity rays or laser radiation exists.
v
General Safety Summary
Product Damage Precautions
Use Proper Power Source
Do not operate this product from a power source that applies more than the
voltage specified.
Do Not Operate With
Suspected Failures
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
Safety Terms and Symbols
Terms in This Manual
Terms on the Product
These terms may appear in this manual:
WARNING statements identify conditions or practices that could result in injury
or loss of life.
CAUTION statements identify conditions or practices that could result in
damage to this product or other property.
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
Symbols in This Manual
Symbols on the Product
vi
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
This symbol may appear in the manual:
This symbol indicates where specific cautions and warnings are found.
These symbols may appear on the product:
DANGER
High Voltage
Protective ground
(earth) terminal
ATTENTION
Refer to
manual
A6906S Fiber-Optic Isolation System User Manual
Preface
The A6906S Fiber-Optic Isolation System allows long-distance transmission of
electrical signals. Features include:
H Ability to safely use the transmitter in a floating or ungrounded environment.
H Electrical isolation between transmitter and receiver.
H Up to 200 meter fiber-optic cable length (with Option 3).
H 100 MHz bandwidth.
The A6906S Fiber-Optic Isolation System converts an input analog electrical
signal into an optical signal. This signal is then transmitted along the fiber-optic
cable, received, and converted back into an electrical signal. This transmission
scheme provides a signal transmission system that operates over long distances,
offers low distortion, transmits at high speed, and electrically insulates the
signal. The A6906S Fiber-Optic Isolation System has the following components:
H A69T06 Transmitter, with battery pack, fiber-optic cable, and probe.
H A69R06 Receiver.
H A69C06 Sealed Lead-Acid Battery Charger.
The A69T06 Transmitter is an electrical-to-optical (E/O) converter; it converts
an input electrical signal into an optical signal. System gain is controlled by an
attenuator that is set in a 1–2–5 sequence. The A69T06 is also provided with a
variable-gain amplifier for self-calibration to maintain measurement precision.
The A69T06 is powered by an internal sealed rechargeable lead-acid battery
pack.
The A69R06 Receiver is an optical-to-electrical (O/E) converter. It converts an
optical signal input, via a fiber-optic cable, into an electrical signal. This unit
functions as the controller for the A69T06 Transmitter. It can be used to control
self-calibration and transmitter attenuator switching using front-panel operations.
The A69R06 can also be controlled from an external device via the GPIB
(IEEE–488) interface.
The A69C06 Sealed Lead-Acid Battery Charger charges the battery pack while
the battery pack is removed from the A69T06.
A6906S Fiber-Optic Isolation System User Manual
vii
Preface
Options
You can order the A6906S Fiber-Optic Isolation System with different options,
as listed in Tables i and Figure i.
T able i: A6906S Order Options
Option Number Description
01 Replace standard 3 meter fiber-optic cable with 20meter cable.
02 Replace standard 3 meter fiber-optic cable with 100 meter cable.
03 Replace standard 3 meter fiber-optic cable with 200 meter cable.
04 Replace standard 3 meter fiber-optic cable with 10 meter cable.
Standard*
North American
115V
Option A3
Australian
230V
* Canadian Standards Association certification
includes these power plugs for use in the
North American power network
Option A1
Universal Euro
Option A4*
North American
Figure i: Power-Cord Plug Options
230V
230V
Option A2
UK
230V
Option A5
Switzerland
230V
viii
A6906S Fiber-Optic Isolation System User Manual
Standard Accessories
Preface
The standard accessories that are included with the A6906S are listed below.
Accessories, for example spare battery packs, can be ordered separately by using
the Tektronix part numbers listed in the Replaceable Parts List on page 53.
H battery pack
H 50 W BNC Cable
H 50 W Feedthrough Termination
H Industrial lead set (for banana plug test accessories)
H Retractable Hook Probe Tip
H Spare Fuse for the A69R06
H Spare Fuse for the A69C06
H Fiber-Optic Cable Connector Cleaner (set of 5)
Optional Accessories
H A6906S Fiber-Optic Isolation System User Manual
H Two power cords
H 6-Inch Ground Lead
The optional accessories listed below can be ordered for use with your A6906S.
Tektronix part numbers for these accessories can be found in the Replaceable
Parts List on page 53.
H 75 W BNC Cable
H 75 W Feedthrough Termination
H GPIB Cable
H Index Matching Oil (for optical cable connections)
H Fiber-Optic Cable Connector Cleaner (set of 200)
A6906S Fiber-Optic Isolation System User Manual
ix
Preface
Customer Support
To help you get the best performance from your A6906S, Tektronix offers the
sales, application, and service support:
Sales Support
Application Support
Service Support
To order optional equipment and accessories, call the Tektronix National
Marketing Center at 1-800-426-2200. Outside the United States or Canada,
contact your nearest Tektronix Service Center.
For assistance in applying the A6906S Fiber-Optic Isolation System to your
measurement needs, contact Tektronix Customer Support at 1-800-835-9433
x2400, between 6 am and 5 pm Pacific time. Outside the United States or
Canada, contact your nearest Tektronix Service Center.
To obtain exchange modules to repair your A6906S, call the Tektronix FastParts
Center at 1-800-848-5083. If you want Tektronix to perform repair or calibration
services, or should your A6906S system need repair beyond that described in
this manual, contact your nearest Tektronix Service Center.
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A6906S Fiber-Optic Isolation System User Manual
Getting Started
This section tells you how to set up the A6906S Fiber-Optic Isolation System for
battery charging and normal operation. Since the A69T06 Transmitter operates
using battery power, you will first need to charge the battery pack.
AC Power
The A6906S Fiber-Optic Isolation System is capable of continuous operation
with input voltages that range from 90 V to 250 V with source voltage frequencies from 47 Hz to 66 Hz.
Detachable three-wire power cords with three-contact plugs are provided with
the A69R06 Receiver and A69C06 Sealed Lead-Acid Battery Charger for
connection to both the power source and protective ground. For electrical shock
protection, insert these plugs into a power source outlet that has a properly
grounded protective ground contact.
Charging the battery pack
The A69T06 Transmitter is powered from a battery pack. To charge the battery
pack, you need to remove it from the A69T06 Transmitter. It takes 12 hours to
charge a battery pack that has been fully discharged. You cannot use a battery
pack to power the A6906S while the battery pack is charging, but you can use a
second battery pack to operate the A69T06 while charging a battery pack using
the A69C06.
WARNING. Before removing the battery pack for charging, disconnect the probe
from the circuit being measured.
Do not put your hand or any foreign object into the battery pack compartment
after removing the battery pack.
Do not use the A69C06 Sealed Lead-Acid Battery Charger with any instrument
or battery other than the A6906S battery pack.
1. Connect the A69C06 Sealed Lead-Acid Battery Charger to the AC power
source through the supplied grounded power cord. Make sure that the green
POWER light is on.
2. Turn off the A69T06 by pressing the OFF button on the battery pack. The
red power light will turn off.
A6906S Fiber-Optic Isolation System User Manual
1
Getting Started
3. Remove the battery pack from the A69T06 by unscrewing the two thumb-
screws on the front of the battery pack, as shown in Figure 1. Pull the battery
pack completely out of the A69T06.
Figure 1: A69T06 Battery Removal
4. Connect the cable from the A69C06 OUTPUT to the connector on the right
side of the battery pack, as shown in Figure 2.
To AC Power
Source
Side Connector
OUTPUT
Figure 2: Battery Charging
5. Make sure the red CHARGE light on the front of the A69C06 is on. When
the battery pack is fully charged, this light will turn off.
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A6906S Fiber-Optic Isolation System User Manual
Preparing for Operation
Getting Started
NOTE. battery packs are shipped fully charged. If you do not see the charge light
come on, the battery pack is still fully charged and can be used immediately.
6. When the battery pack is fully charged, disconnect it from the A69C06 and
reinstall it in the A69T06 Transmitter. Install the battery pack right-side up
in the A69T06, or the A69T06 will not operate even though the power light
turns on.
Figure 3 shows the connections necessary to use the A6906S Fiber-Optic
Isolation System.
NOTE. The A69T06 Transmitter, fiber-optic cable, and A69R06 Receiver have
been calibrated at the factory as a unit. Do not exchange modules among
A6906S Fiber-Optic Isolation Systems; Tektronix will not warrant performance
to specifications if you do so. Always use an A69T06 and A69R06 having
matching serial numbers.
Test Oscilloscope
50 W oscilloscope
input (or add 50 W
termination here if
oscilloscope has only
high-impedance input).
50 W Output
White
75 W Output
Red
Figure 3: A6906S Connections for Use
Connecting the
Fiber-Optic Cable
The fiber-optic cable connects the A69R06 Receiver to the A69T06 Transmitter.
The cable consists of two optical conductors, one for signal and one for control
commands. The two optical conductors are marked with different colored
protective caps: white marks the signal conductor and red marks the command
conductor.
A69R06
SIGNAL
COMMAND
To AC Power
Source
Fiber-Optic Cable
A69T06
Probe
A6906S Fiber-Optic Isolation System User Manual
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Getting Started
CAUTION. Be careful not to bend the fiber-optic cable excessively or apply
excessive force. When storing the fiber-optic cable, be sure to replace the cable
and the unit’s protective caps to protect them from soiling.
1. Remove the protective caps from the A69R06 SIGNAL and COMMAND
connectors.
2. Remove the red protective cap from the fiber-optic cable.
3. Remove the clear plastic protector from the optical surface of the fiber-optic
cable.
4. Place the cable strain relief around the A69R06 COMMAND conductor as
shown in Figure 4.
5. Insert the uncovered cable plug into the A69R06 COMMAND conductor.
Verify that the plug’s notch is completely seated in the connector’s groove
and then tighten the plug retaining ring, hand tight only.
Connecting to the
Oscilloscope
Strain relief on one connector only
Figure 4: Connection of the Fiber-Optic Cable and Connector
6. Repeat steps 2 and 5 for the white-capped fiber-optic cable, connecting it to
the A69R06 SIGNAL connector.
Use the included 50 W BNC cable to connect the A69R06 50 W OUTPUT to a
50 W oscilloscope input. If you have a 75 W system, you can use the 75 W
OUTPUT connector instead.
If your oscilloscope has only high-impedance inputs, you can install the included
50 W feedthrough termination between the oscilloscope input and the 50 W BNC
cable. Do not install the termination at the A69R06 end of the cable.
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A6906S Fiber-Optic Isolation System User Manual
Getting Started
NOTE. The self-calibration feature of the A6906S requires that the 50 W output of
the A69R06 be terminated into 50 W. If you are using a 75 W system, attach the
50 W feedthrough termination to the 50 W output and use the 75 W output to
connect to the system input.
AC Power
Connect the A69R06 Receiver to the AC power source through the supplied
grounded power cord.
Once you have connected the fiber-optic cable, the oscilloscope, and the power
cord, the A6906S Fiber-Optic Isolation System system is ready to power on and
use.
A6906S Fiber-Optic Isolation System User Manual
5
Getting Started
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A6906S Fiber-Optic Isolation System User Manual
Operating Basics
This section tells you how to operate the A6906S Fiber-Optic Isolation System
once it is installed.
NOTE. To use this section, you must first install the A6906S as described in the
Getting Started section starting on page 1. A battery pack must be charged and
installed in the A69T06 Transmitter.
Power On and Calibration
The A6906S requires that both the A69T06 Transmitter and A69R06 Receiver be
powered on. The A69T06 takes power from its battery pack, and the A69R06
takes power from the AC line.
1. On the A69T06 battery pack, press the ON button to turn on transmitter
2. On the A69R06, turn on the power using the POWER OFF/ON switch on
power. The red light between the ON and OFF buttons will turn on.
the back panel.
If the attenuation display shows Er1, check the fiber-optic cable connections
between the transmitter and receiver. If necessary, clean the optical connectors as described in Cleaning Optical Connectors on page 11.
Allow the system to warm up for 20 minutes before proceeding. If you do
proceed to use the A6906S, perform step 3 below after 20 minutes have
passed since power on. Performance to specifications is guaranteed only after
20 minutes warm-up.
NOTE. The self-calibration feature of the A6906S requires that the 50 W output of
the A69R06 be terminated into 50 W. If you are using a 75 W system, attach the
50 W feedthrough termination to the 50 W output and use the 75 W output to
connect to the system input.
3. On the A69R06 front panel, press the CAL button to initiate the calibration
procedure. The transmitter and receiver will calibrate themselves to each
other. The calibration process takes approximately one minute the first time
after power on, subsequent calibrations take approximately 30 seconds.
When the calibration is complete, the green PASS light will turn on.
A6906S Fiber-Optic Isolation System User Manual
7
Operating Basics
If the red FAIL light comes on instead, check the fiber-optic cable connections between the transmitter and receiver. If necessary, clean the optical
connectors as described in Cleaning Optical Connectors on page 11. If the
green PASS light still doesn’t come on, the instrument needs repair.
Once the A6906S is powered up and calibrated, it is controlled by the front panel
buttons on the front of the A69R06 Receiver. It can also be controlled by a GPIB
computer or controller connected to the A69R06, making it a part of an
automated test system.
Optional Temperature Calibration
The A69T06 monitors its internal temperature and applies internal calibration
corrections to compensate for drift in offset. Temperature does not affect the
A69R06 and so it has no temperature monitoring system.
Normally, temperature corrections are applied based on default correction values.
You can override the default values with values that are optimized to a specific
temperature; however, if the temperature changes while the override values are in
effect the A69T06 will not correct the for the offset drift induced by the changed
temperature. To set optimum override values, follow these steps:
Operation
1. Install the A6906S in the environment in which it will be used.
2. On the A69R06, press the CAL and COUPLING buttons simultaneously.
3. Press the A69R06 COUPLING button again.
4. Allow the temperature environment to stabilize. Do not continue to step 5
until the A69T06 has been in a temperature-stable environment for at least
20 minutes.
5. Press the A69R06 COUPLING button again. Until this step is completed,
the A6906S will not respond to GPIB commands.
To return to normal operation with default temperature correction values:
1. Install the A6906S in the environment in which it will be used.
2. On the A69R06, press the CAL and COUPLING buttons simultaneously.
3. Press the A69R06 CAL button again.
To use the A6906S Fiber-Optic Isolation System to take a measurement, connect
the probe to the circuit you want to test, select the ATTENUATOR and
COUPLING settings on the A69R06, and view the output on the oscilloscope.
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A6906S Fiber-Optic Isolation System User Manual