Tektronix P6248 User manual

Service Manual
P6248
1.7 GHz (Typical)
Differential Probe
071-0573-03
*P071057303*
071057303
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.

Copyright ©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.
KlipChip, TwinFoot, TwinTip, and VariTip are 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.

P6248 1.7 GHz Differential Probe Service Manual i
Table of Contents
General Safety Summary iii...................................
Service Safety Summary v....................................
Preface vii...................................................
Related Manuals vii.................................................
Contacting Tektronix vii.............................................
Specifications 1.............................................
Warranted Characteristics 1..........................................
Typical Characteristics 2............................................
Nominal Characteristics 4...........................................
Performance Verification 5...................................
Equipment Required 5..............................................
Preparation 6.....................................................
Output Offset Voltage 7.............................................
DC Attenuation Accuracy 8.........................................
Differential Signal Range 9..........................................
Rise Time 11......................................................
Common-Mode Rejection Ratio 14....................................
TEKPROBE Communication (operational check) 16......................
Adjustment Procedures 19.....................................
Equipment Required 19..............................................
Offset (preliminary) 20..............................................
Gain 22...........................................................
Offset (Final) 23...................................................
DC CMRR 23.....................................................
AC CMRR 25.....................................................
Maintenance 27..............................................
Cleaning 27.......................................................
Replacing TEKPROBE Interface Pins 27................................
Removing and Replacing the TEKPROBE Interface Collar 28...............
Options 29..................................................
Replaceable Parts 31..........................................
Appendix A: Alternate Verification Procedures 39.................
Equipment Required 39..............................................
Preparation 40.....................................................
CMRR (Common-Mode Rejection Ratio) 41.............................

Table of Contents
ii P6248 1.7 GHz Differential Probe Service Manual
List of Figures
Figure 1: Typical Common-Mode Rejection Ratio
(÷1and÷10 attenuation) 3...............................
Figure 2: Typical differential input impedance versus frequency 3..
Figure 3: Dimensions of probe head and compensation box 4.......
Figure 4: Setup for the output offset voltage test 7................
Figure 5: Setup for differential-mode tests 9.....................
Figure 6: Test system rise time setup 11..........................
Figure 7: Rise time setup for test system with probe 12.............
Figure 8: Setup for CMRR test 15..............................
Figure 9: Adjustment locations 20...............................
Figure 10: Setup for the offset adjustment 21.....................
Figure 11: Setup for gain adjustment 22.........................
Figure 12: Setup for DC CMRR and AC CMRR adjustments 24.....
Figure 13: Replacing TEKPROBE interface pins 27...............
Figure 14: Replacing the TEKPROBE collar 28...................
Figure 15: P6248 replaceable parts 31...........................
Figure 16: P6248 standard accessories 33........................
Figure 17: P6248 optional accessories 35.........................
Figure 18: Normalizing the setup 41.............................
Figure 19: Setup for the CMRR tests 42..........................

P6248 1.7 GHz Differential Probe Service Manual iii
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Connect and Disconnect Properly. Connect the probe output to the measurement
instrument before connecting the probe to the circuit under test. Disconnect the
probe input and the probe ground from the circuit under test before disconnecting
the probe from the measurement instrument.
Ground the Product. 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.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Connect the ground lead of the probe to earth ground only.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
Terms in this Manual. These terms may appear in this manual:
ToAvoidFireor
Personal Injury
Symbols and Terms

General Safety Summary
iv P6248 1.7 GHz Differential Probe Service 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. The following symbols may appear on the product:
CAUTION
Refer to Manual
WARNING
High Voltage
Double
Insulated
Protective Ground
(Earth) Terminal

P6248 1.7 GHz Differential Probe Service Manual v
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. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Use Care When Servicing With Power On. To avoid electric shock, do not touch
exposed connections.

Service Safety Summary
vi P6248 1.7 GHz Differential Probe Service Manual