Instructions
P6248
1.7 GHz (Typical)
Differential Probe
071-0566-03
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.
Table of Contents
General Safety Summary iii............................
Preface v............................................
Contacting Tektronix vi.................................
Getting Started 1.....................................
Features and Accessories 1..............................
Installation 8.........................................
Instruments with the TEKPROBE Interface (Tektronix TDS 400,
500, 600, and 700 Series Oscilloscopes) 9...............
Instruments without the TEKPROBE Interface 9............
Operating Basics 11...................................
Input Voltage Limits 11.................................
Maximum Input Voltage 11..............................
Common-Mode Signal Range 11..........................
Differential-Mode Signal Range 12........................
Attenuation Settings 12.................................
Probe Grounding 12....................................
Input Impedance and Probe Loading 14.....................
Common-Mode Rejection 15.............................
Probing Techniques to Maximize CMRR 15.................
Reference 17.........................................
Problems with Single-Ended Measurements 17...............
Differential Measurements 17............................
Common-Mode Rejection Ratio 18........................
Assessing CMRR Error 18...............................
Input Impedance Effects on CMRR 19.....................
Extending the Input Leads 19.............................
Extending the Ground Lead 20............................
Extending the Probe Output 20...........................
Terminating the Probe 20................................
Effect of Extending the Output Cable 21....................
Using the Probe with Other Instruments 21..................
Specifications 23......................................
Warranted Characteristics 23.............................
Typical Characteristics 25...............................
Nominal Characteristics 28..............................
P6248 1.7 GHz Differential Probe Instructions
i
Table of Contents
List of Figures
Figure 1: Input connector of TEKPROBE interface 8......
Figure 2: Using the short ground contact 13...............
Figure 3: T ypical probe input model 14...................
Figure 4: Using the input lead accessories to achieve
high CMRR 15.....................................
Figure 5: Using the TwinFoot adapter 16..................
Figure 6: Simplified model of a differential amplifier 18.....
Figure 7: Twisting the Input Leads 20....................
Figure 8: Typical Common-Mode Rejection Ratio
(B1 and B10 attenuation) 26..........................
Figure 9: Typical differential input impedance versus
frequency 26.......................................
Figure 10: Probe head and compensation box dimensions 27.
ii
P6248 1.7 GHz Differential Probe Instructions
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 specifie d.
Only qualified personnel should perform service procedures.
To Avoid Fire or Personal Injury
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.
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 produc t wit h
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.
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.
P6248 1.7 GHz Differential Probe Instructions
iii
General Safety Summary
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:
CAUTION
Refer to Manual
Protective Ground
(Earth) Terminal
iv
P6248 1.7 GHz Differential Probe Instructions
Preface
This manual contains instructions and specifications for using t he
P6248 differential probe.
Related Manuals
For performance verification procedures, adjustment procedures, a
list of replaceable parts, and other service information, refer to the
P6248 Service Manual (071-0573-XX).
P6248 1.7 GHz Differential Probe Instructions
v
Preface
Contacting Tektronix
Phone 1-800-833-9200*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales
support
Service
support
Technical
support
* This phone number is toll free in North America. After office
hours, please leave a voice mail message.
Outside North America, contact a Tektronix sales office or
distributor; see the Tektronix web site for a list of offices.
1-800-833-9200, select option 1*
1-800-833-9200, select option 2*
Email: techsupport@tektronix.com
1-800-833-9200, select option 3*
6:00 a.m. -- 5:00 p.m. Pacific time
vi
P6248 1.7 GHz Differential Probe Instructions
Getting Started
The P6248 is a high-bandwidth differential probe with the TE KPROBE interface. The P6248 probe has a bandwidth of 1.5 GHz
(1.7 GHz typical). The probe has low circuit loading, high commonmode rejection, and comes with accessories that accommodate a
wide variety of applications.
The TEKPROBE interface is standard on Tektronix TDS series
oscilloscopes. The Tektronix 1103 TEKPROBE Power Supply can be
used for instruments without the TEKPROBE interface (refer to
page 7).
Features and Accessories
Table 1 shows the features and standard accessories of the P6248
differential probe.
Table 1: P6248 features and standard accessories
Feature/Accessory Description
TEKPROBE interface. The TEKPROBE interface supplies
power to the probe, selects the correct display scaling, and
automatically sets the 50 Ω termination on the oscilloscope input.
If your oscilloscope does not have the TEKPROBE interface, you
can use the optional 1103 power supply (refer to page 7).
Probe attenuation. The attenuation switch selects either divide
by 1 (÷1) or divide by 10 (÷10).
P6248 1.7 GHz Differential Probe Instructions
1
Getting Started
Table 1: P6248 features and standard accessories (Cont.)
Feature/Accessory Description
--
Ground
+
Input connections. The (+), (--), and ground connections of the
probe head accept the standard and optional probe accessories.
You can also plug the head directly onto a pair of 0.025-inch
square pins that have the standard spacing of 0.100-inch on
center.
CAUTION: To avoid damaging the input connectors, do not insert
anything larger than a 0.025-inch square pin into the inputs. To
prolong the life of the connectors, use the tip saver or smooth,
gold-plated pins only.
Instrument case. The instrument case protects the probe from
harsh environments and provides room for storing optional
accessories.
Replacement part number (P6248): 016-1879-XX
Calibration certificate. A certificate of traceable calibration is
provided with every instrument shipped.
Instructions. Provides instructions for operating the P6248
differential probe.
Replacement part number: 071-0566-XX
2
P6248 1.7 GHz Differential Probe Instructions
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