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Service Manual
P6243
1 GHz 10X Active Probe
070-9409-03
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com
Copyright E Tektronix, Inc. All rights reserved.
Tektronix 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.
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX, TEK, and TEKPROBE are registered trademarks of
Tektronix, Inc.
WARRANTY
Tektronix 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, Tektronix, 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 Tektronix, 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 Tektronix 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. Tektronix shall not be obligated to furnish
service under this warranty a) to repair damage resulting from attempts by personnel other
than Tektronix 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-Tektronix 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 REPAIR 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
General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Operating Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maximum Non-destructive Input Voltage . . . . . . . . . . . . . . . . . 9
Input Linear Dynamic Range . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Probe Head and Cable Assembly . . . . . . . . . . . . . . . . . . . . . . . 10
Compensation Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Equipment Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DC Attenuation Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Replacing TEKPROBE Interface Pins . . . . . . . . . . . . . . . . . . 16
Removing and Replacing the Compensation Box Covers . . . . 17
Removing and Replacing the TEKPROBE Interface Collar . 19
Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Preparation for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
P6243 Service Manual i
Table of Contents
List of Figures
Figure 1: Typical Frequency Response . . . . . . . . . . . . . . . . . . . 3
Figure 2: Typical Linearity Error vs. VIN . . . . . . . . . . . . . . . . . 4
Figure 3: Typical Input Impedance vs. Frequency . . . . . . . . . . 5
Figure 4: Typical Non-Destructive Peak Voltage Derating vs.
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 5: P6243 Simplified Schematic Diagram . . . . . . . . . . . 10
Figure 6: TEKPROBE Interface . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7: P6243 DC Attenuation Accuracy Setup . . . . . . . . . . 14
Figure 8: Replacing TEKPROBE Interface Pins . . . . . . . . . . . 16
Figure 9: Removing the Compensation Box Covers . . . . . . . . . 17
Figure 10: Replacing the Compensation Box Cover . . . . . . . . . 18
Figure 11: Replacing the TEKPROBE Collar . . . . . . . . . . . . . . 19
Figure 12: P6243 Replaceable Parts . . . . . . . . . . . . . . . . . . . . . 22
Figure 13: P6243 Standard Accessories . . . . . . . . . . . . . . . . . . 24
Figure 14: P6243 Optional Accessories . . . . . . . . . . . . . . . . . . 26
List of Tables
Table 1: Warranted Electrical Specifications . . . . . . . . . . . . . . 1
Table 2: Typical Electrical Characteristics . . . . . . . . . . . . . . . . 2
Table 3: Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4: Environmental Characteristics . . . . . . . . . . . . . . . . . . 7
Table 5: Certifications and Compliances . . . . . . . . . . . . . . . . . 8
Table 6: Equipment Required for Performance Verification . . 12
ii P6243 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.
Injury Precautions
Avoid Electric Overload. To avoid electric shock or fire hazard, do not
apply a voltage to a terminal that is outside the range specified for
that terminal.
Do Not Operate Without Covers. To avoid electric shock or fire hazard,
do not operate this product with covers or panels removed.
Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not
operate this product in wet or damp conditions.
Do Not Operate in an 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. If you suspect there is damage
to this product, have it inspected by qualified service personnel.
Do Not Immerse in Liquids. Clean the probe using only a damp cloth.
The cloth must be dampened with either isopropyl alcohol or a mild
detergent and water solution. Do not use any other chemicals or
abrasives to clean the probe.
P6243 Service Manual iii
General Safety Summary
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. 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. These symbols may appear on the product:
DANGER Protective Ground ATTENTION Double
High Voltage (Earth) Terminal Refer to Manual Insulated
iv P6243 Service Manual
Specifications
The warranted specifications in Table 1 apply to a P6243 Active
Probe when the probe and the host instrument are allowed to warm
up for 20 minutes before measurements are taken. The warranted
specifications that appear in boldface type are specifications checked
in the Performance Verification section of the service manual.
The specifications in Tables 2 through 5 are provided as general
information for your convenience.
CAUTION. Do not apply voltages beyond the non-destructive input
voltage range to the probe. Damage to the probe or circuit under test
may result. Refer to Figure 4 on page 6.
Table 1: Warranted Electrical Specifications
Analog Bandwidth (probe only) >1.0 GHz
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