Copyright E Sony/Tektronix Corporation. 1994. All rights reserved.
Copyright E T ektronix, Inc. 1994. 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 Japan.
Sony/T ektronix Corporation, P.O. Box 5209, T okyo Int’l, Tokyo 100–31 Japan
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.
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; 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 PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUST OMER 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
General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safty Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options And Accessories 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Source 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Fuse 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Probe 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Output Cables 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Check 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning On Power 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Calibration 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
Functional Overview 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Isolator Front Panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Isolator Rear Panel 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Isolator Scale Factor 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Probes 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Probe 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Common Lead Length 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A620 Current Probe 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Introduction 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Adjustments 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting Offset Values 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting Gain Values 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Programming 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Requirements 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the GPIB Parameters 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Documents You Will Need 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Interface Functions 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Messages 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote, Local and Lockout 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Syntax 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Configuration 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Header 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6907 & A6909 Service Manual
i
Contents
Arguments 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delimiters 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Form 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Linking Commands 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Groups 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel Control 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration and T esting 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status and Events 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronization 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commands 3–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status and Events 3–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Registers 3–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Registers 3–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enable Registers 3–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Queues 3–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status and Event Processing Sequence 3–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Messages 3–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronizing Execution 3–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Warranted Electrical Characteristics 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ypical Electrical Characteristics 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Characteristics 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Characteristics 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certifications and Compliances 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Power 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control and Calibration 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Prerequisites 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Equipment 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Location 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ON/STBY button function check 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Factory Calibration 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset and Gain Check 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T otal Harmonic Distortion Check 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noise Check 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low-Frequency Pulse Response (Flatness) Check 6–15. . . . . . . . . . . . . . . . . . . . . . .
Rise Time and Aberration Check 6–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth Check 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures
ii
Requirements for Performance 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Equipment 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6907 & A6909 Service Manual
Maintenance
Contents
Preparation 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly Locations 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E/O Adjustment Locations 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+15 V and –15V Adjustment 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset and Gain Adjustments 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low-Frequency Response Adjustment 7–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High-Frequency Response Adjustment 7–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Strategy 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning 8–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 8–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Isolator Inspection 8–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Replacement 8–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Cord 8–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabinet 8–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front-Panel Assembly 8–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E/O-O/E Module 8–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A40 CPU Board 8–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Panel Assembly 8–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A50 Distributor Board 8–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
U10 and U20 Power Supplies 8–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A30 Floating Power Supply 8–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Procedures 8–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
After Repair Adjustments 8–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Withstand-Voltage Check 8–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging Instructions 8–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams .
Replaceable Parts
Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6907 & A6909 Service Manual
iii
Contents
List of Figures
Figure 1–1: Isolator Setup 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–1: Isolator Front Panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Isolator Rear Panel 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Special Voltage Probe and Accessories 2–5. . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: Waveform Distortion from Common Lead Length 2–7. . . . . . . . . . . . .
Figure 2–5: Common Lead Equivalent Circuit 2–7. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–6: A620 Current Probe 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: T ypical Stacked GPIB Connectors 3–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–2: T ypical GPIB Network Configurations 3–6. . . . . . . . . . . . . . . . . . . . . .
Figure 3–3: The Status Byte Register (SBR) 3–31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–4: The Standard Event Status Register (SESR) 3–32. . . . . . . . . . . . . . . . . .
Figure 3–5: The Device Event Status Enable Register (DESER) 3–34. . . . . . . . . . . .
Figure 3–6: The Event Status Enable Register (ESER) 3–34. . . . . . . . . . . . . . . . . . . .
Figure 3–7: The Service Request Enable Register (SRER) 3–34. . . . . . . . . . . . . . . . .
Figure 3–8: Status and Event Processing Sequence 3–36. . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1: Frequency Derating for the Maximum Normal Mode Voltage 4–3. . . .
Figure 4–2: Frequency Derating for the Maximum Common Mode Voltage 4–3. . .
Figure 6–1: Electrical-to-Optical (E/O) Isolator Adjustment Locations 6–3. . . . . . .
Figure 6–2: Factory Calibration T est Setup 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–3: Factory Calibration T est Setup 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–4: DC Offset and Gain Test Setup 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: DC Offset and Gain Test Setup 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–6: Total Harmonic Distortion T est Setup 6–11. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–7: Noise Check Setup 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–8: Low-Frequency Pulse Response Check Setup 6–15. . . . . . . . . . . . . . . . .
Figure 6–9: Rise Time and Aberrations Check Setup 6–18. . . . . . . . . . . . . . . . . . . . .
Figure 6–10: Bandwidth Check Setup 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–1: Electrical-to-Optical (E/O) Isolator Adjustment Locations 7–3. . . . . . .
Figure 7–2: A40 Test Point Locations 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–3: Power Supply Adjustment Location 7–5. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–4: DC Offset and Gain Test Setup 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–5: DC Offset and Gain Test Setup 7–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–5: Positive DC Gain T est Setup 7–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–6: Low-Frequency Response Adjustment Setup 7–9. . . . . . . . . . . . . . . . .
Figure 7–7: High-Frequency Response Adjustment Setup 7–11. . . . . . . . . . . . . . . . .
Figure 8–1: Line Cord Removal 8–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8–2: Cabinet Removal 8–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8–3: Front-Panel Assembly Removal 8–7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8–4: E/O-O/E Module Removal 8–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8–5: Input Connector Sleeve Removal 8–9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8–6: Separating the E/O and O/E Converters 8–9. . . . . . . . . . . . . . . . . . . . . .
Figure 8–7: A40 CPU Board Removal 8–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
A6907 & A6909 Service Manual
Figure 8–8: Rear-Panel Assembly Removal (A6907) 8–11. . . . . . . . . . . . . . . . . . . . .
Figure 8–9: Rear Panel Assembly Removal (A6909) 8–12. . . . . . . . . . . . . . . . . . . . .
Figure 8–10: A50 Distributor Board Removal 8–13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8–11: Power Supply Assembly Removal (A6907) 8–14. . . . . . . . . . . . . . . . . .
Figure 8–12: Power Supply Assembly Removal (A6909) 8–14. . . . . . . . . . . . . . . . . .
Figure 8–13: A30 Floating Power Supply Removal (A6907) 8–15. . . . . . . . . . . . . . .
Figure 8–14: A30 Floating Power Supply Removal (A6909) 8–16. . . . . . . . . . . . . . .
Figure 8–15: Troubleshooting Tree 8–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8–16: Floating Voltage Check Setup 8–19. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–1: A6907 Block Diagram 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–2: A6907 Interconnect Diagram 9–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–3: A6909 Block Diagram 9–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9–4: A6909 Interconnect Diagram 9–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10–1: A6907 and A6909 Replaceable Parts 10–3. . . . . . . . . . . . . . . . . . . . . . .
Contents
A6907 & A6909 Service Manual
v
Contents
List of Tables
Table 1–1: Optional Power Cords 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 1–2: Isolator Error Codes 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 2–1: Isolator Scale Factors 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–1: GPIB Functions 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–2: BNF Symbols and Meanings 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–3: Header Configuration Types 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–4: Numeric Expressions 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–5: Channel Control 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–6: Calibration and Testing 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–7: Status and Events 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–8: Synchronization 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–9: System Commands 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–10: SRB Bit Functions 3–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–11: SESR Bit Functions 3–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–12: Normal Status 3–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–13: Command Errors 3–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–14: Execution Errors 3–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–15: Internal Errors 3–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 3–16: System Events 3–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 4–1: Warranted Electrical Characteristics 4–1. . . . . . . . . . . . . . . . . . . . . . . . .
T able 4–2: Typical Electrical Characteristics 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 4–3: Mechanical Characteristics 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 4–4: Environmental Characteristics 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 4–5: Certifications and Compliances 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 6–1: Required Test Equipment 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 6–2: Isolator Offset and Gain Check 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able 7–1: Test Equipment, Fixtures, and Supplies 7–2. . . . . . . . . . . . . . . . . . . . . .
T able 8–1: Withstand-Voltage Required Equipment 8–19. . . . . . . . . . . . . . . . . . . . . .
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A6907 & A6909 Service 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
Use Proper Power Cord
Avoid Electric Overload
Ground the Product
Do Not Operate in
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 terminal that is
outside the range specified for that terminal.
This product is grounded through the grounding conductor of the 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 electric shock, do not operate this product in wet or damp conditions.
Wet/Damp Conditions
Do Not Operate in
Explosive Atmosphere
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
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
A6907 & A6909 Service Manual
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
vii
General Safety Summary
Safety Terms and Symbols
Terms in This Manual
Terms on the Product
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.
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
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
Certifications and Compliances
CSA Certified Power
Cords
viii
CSA Certification includes the products and power cords appropriate for use in
the North America power network. All other power cords supplied are approved
for the country of use.
Protective Ground
(Earth) Terminal
ATTENTION
Refer to
Manual
Double
Insulated
A6907 & A6909 Service Manual
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone
Disconnect Power
Use Care When Servicing
With Power On
Do not perform internal service or adjustments of this product unless another
person capable of rendering first aid and resuscitation is present.
To avoid electric shock, disconnect the main power by means of the power cord
or, if provided, the power switch.
Dangerous voltages or currents may exist in this product. Disconnect power,
remove battery (if applicable), and disconnect test leads before removing
protective panels, soldering, or replacing components.
To avoid electric shock, do not touch exposed connections.
A6907 & A6909 Service Manual
ix
Service Safety Summary
x
A6907 & A6909 Service Manual
Getting Started
Product Description
The A6907 and A6909 High Voltage Isolators connect “floating” (not referenced
to ground) signals to an oscilloscope or digitizer for measurement. Optical
couplers, insulated transformers, and plastic barriers are used for extremely high
isolation between channels and the chassis, and from channel to channel.
Signals measured between the tip and common connections of the special probes
are fully isolated from ground and other channels. The maximum rated voltage
between the probe tip and probe common (normal mode voltage) is 850 V (DC +
peak AC). The maximum rated voltage between the probe common and chassis
ground (common mode voltage) is also 850 V (DC + peak AC).
The electrical-to-optical (E/O) converter isolates the signal and converts it to an
optical analogue. The optical-to-electrical (O/E) converter demodulates the
optical signal to an electrical signal whose common mode elements have been
rejected. The E/O converter uses a unique low-contact DC to DC converter as a
power source to provide a high degree of isolation.
The A6907 and A6909 satisfy the UL1244, CSA 231, and IEC1010-1 safety
standards for floating measurements. The A6907 and A6909 have the following
special features:
H DC to 60 MHz bandwidth
H Self-calibration function for accurate measurements
H Portable configuration
H Excellent linearity and low interference
H External control through GPIB interface standard on the A6907
(option 10 on the A6909)
H 20 kV/ms slew rate
A6907 & A6909 Service Manual
1-1
Product Description
1-2
A6907 & A6909 Service Manual
Options And Accessories
Several options and accessories are available for your isolator. Please review this
listing to select the items that best suit your application.
Options
The following options are available for the A6907 and A6909:
H Option 10 includes the GPIB interface on the A6909.
H Options A1–A3, A5. Besides the standard North American, 110 V, 60 Hz
power cord, Tektronix will ship any of four alternate power cords with the
isolator when ordered by the customer.
Table 1-1: Optional Power Cords
Plug Configuration Normal Usage Option Number
Europe
230 V
United Kingdom
230 V
Australia
230 V
Switzerland
230 V
A1
A2
A3
A5
A6907 & A6909 Service Manual
1-3
Options and Accessories
Accessories
The following standard and optional accessories are available for the A6907 and
A6909. Refer to the Replaceable Parts section for current part numbers.
Standard Accessories
Optional Accessories
The A6907 and A6909 come with the following standard accessories:
H Power cord
H Fuses (2.5 Amp, 250V, fast blow)
H 50W BNC cable set (4 cables with A6907, 2 cables with A6909)
H Special probes (4 with A6907, 2 with A6909)
H Instruction Manual
The following optional accessories are available for the A6907 and A6909:
H 50W BNC feedthrough termination
H GPIB cable
H A620 current probe
1-4
A6907 & A6909 Service Manual
Installation
Power Source
Line Fuse
The isolator must be connected to line power before you can configure it for
measurements. Please read this portion carefully to avoid equipment damage or
personal injury.
The A6907 and A6909 can be used with AC power at frequencies from 50 Hz to
60 Hz and at voltages from 100 V to 240 V.
Make sure that the proper line fuse has been installed before connecting the
isolator to the power source.
CAUTION. The isolator may be damaged if the wrong line fuse is installed.
Check the fuse holder located beneath the input power connector:
1. Disconnect all power and signal connections to the isolator.
2. Use a small straight-slot screwdriver to pry the cap out of fuse holder.
3. Verify proper fuse value:
Standard (115 V): 2.5 A, 250 V, fast-blow
Options A1, A2, A3 & A5 (230 V): 2.5 A, 250 V, slow-blow
For the correct part number of each fuse, refer to Replaceable Parts on
page 10–8.
4. Install the proper fuse and reinstall the fuse holder cap.
A6907 & A6909 Service Manual
1-5
Installation
Power Cord
Connecting the Probe
WARNING. In order to prevent electrical shock, only plug the power cord into
grounded three-wire outlets. Do not defeat the ground connection on the plug.
The A6907 and A6909 power cords are three-wire grounded cords. The metal
portions on the outside of the isolator are connected to the power-source ground
by means of the ground wire in the power cord and plug.
WARNING. In order to prevent electrical shock, do not substitute any other style
of probe for the special probes provided with the isolator. The provided probes
are specially insulated for high voltage measurements.
Do not make connections to a circuit before connecting the probe to the isolator.
Firmly push the probe connector into the channel input on the front panel of the
isolator. Refer to Figure 1–1.
For information on probe accessories and probing techniques, refer to the Special
Probe section starting on page 2–5.
Connecting Output Cables
Use the 50 W BNC cables included with the instrument to connect the isolator to
an oscilloscope or digitizer. Refer to Figure 1–1.
NOTE. The input impedance of the connected oscilloscope must be 50W. If your
oscilloscope does not provide a 50W termination, attach an optional 50W
feedthrough termination between the BNC cable and the oscilloscope input
connector. Unterminated channels will report the error code E06 during
self-calibration.
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A6907 & A6909 Service Manual
Test Oscilloscope
Installation
Probe
Isolator
To CH1 OUTPUT Connector
Coaxial Cable
Figure 1-1: Isolator Setup
Set the oscilloscope input attenuators to 100 mV/division.
A6907 & A6909 Service Manual
1-7
Installation
1-8
A6907 & A6909 Service Manual
Functional Check
Turning On Power
After line power is connected to the isolator, perform a functional check to test
normal system operation. To ensure proper operation of your isolator, follow
these steps:
Set the POWER switch on the rear panel to the ON position. This enables the
STBY/ON control on the front panel.
Press the STBY/ON button on the front panel. The isolator will automatically
begin the self-test procedure.
If the results of the self-test are normal, the channel display settings revert to the
values that were effective when the power was last turned off. If there is a
self-test error, an error code will appear on all of the channel indicators. See
Table 1–2.
Table 1-2: Isolator Error Codes
Error Code Description
E01 ROM checksum error
E02 RAM read/write error
E03 EEPROM checksum error
E04 EEPROM read/write error
If an error code is displayed, contact your local Tektronix Field Office for
assistance.
A6907 & A6909 Service Manual
1-9
Functional Check
SelfĆCalibration
NOTE. In order to ensure the accuracy of measurements, self-calibration should
be performed just before taking measurements.
The A6907 and A6909 are equipped with a self-calibration function that
automatically calibrates the offset and gain for each channel for maximum
accuracy. After the isolator has been warmed up for 20 minutes, use the
following procedure to perform the self-calibration:
1. Make sure that each channel output is terminated into 50 W.
2. Set the oscilloscope input attenuators to 100 mV/division.
3. Press the CAL button on the front panel. Self-calibration will begin and the
gain and offset values for each channel will be calibrated. If self-calibration
completes without error, the values shown on the indicators will return to
normal.
NOTE. If error code EO6 appears after self-calibration, it may be because a
50 W load is not connected to the channel output. If a load is properly connected but the error code is still displayed, contact your local Tektronix
Field Office.
If you need to enter custom offset or gain values, refer to the Manual Adjustments section starting on page 3–3.
1-10
A6907 & A6909 Service Manual
Operating Basics
Functional Overview
This section describes the controls, indicators and connectors on the A6907 and
A6909. Figures 2–1 and 2–2 show the A6907; the A6909 does not have channels
3 and 4.
Isolator Front Panel
Figure 2-1: Isolator Front Panel
A6907 & A6909 Service Manual
2-1
Functional Overview
Isolator Front Panel Controls and Connections
ON/STBY. Pressing the ON/STBY button toggles the isolator between the ON and STANDBY
modes. The POWER switch on the rear panel must be in the ON position in order to enable the
ON/STBY button. See page 2-3 for more details.
CAL. Pressing the CAL button starts a selfĆcalibration process. The CAL process should be run
before making any measurements. Also, the oscilloscope input should be set to 100ĂmV/division
for the output scale factor to be accurate.
See page 1-10 for a description of the selfĆcalibration process.
COUPLING. Pressing the COUPLING button toggles the isolator between DC and AC
input coupling.
DC Coupling - All frequency components included in the input signal are passed to the
attenuator.
AC Coupling - DC signal components are blocked. The input signal first passes through a
capacitor before being coupled to the attenuator.
The coupling status is shown on the left side of the channel display. This button also provides
manual adjustment of the offset and gain values. See Manual Adjustments on page 3-3 for
more details.
SCALE. Pressing the up and down SCALE buttons adjusts the attenuator scale for each
channel on the isolator. The isolator attenuator scale can be set to any value between 100 mV
and 200 V per division in 1-2-5 increments. The value shown on the channel indicator is the
value when the oscilloscope connected to the isolator is set to 100 mV per division.
These buttons are also used during manual adjustment of the offset and gain. See Manual
Adjustments on page 3-3 for more details.
CHANNEL DISPLAY. The channel display indicates channel coupling and scale factor. The
display also shows error codes in the event of an error in the selfĆtest or selfĆcalibration
processes.
INPUT. The INPUT connection is where the probe is connected to the isolator.
Do not attempt to substitute any other style probes for the ones that are provided with the
isolator. The provided probes are specially insulated and using substitute probes may cause an
electrical safety hazard.
WARNING. To avoid the risk of electrical shock, do not connect any other probes
than those shipped with the isolator.
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A6907 & A6909 Service Manual