Tektronix P6248 User manual

xx
P6248
1.7 GHz (Typical)
Differential Probe
ZZZ
Instructions
*P071056604*
071-0566-04
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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P6248
1.7 GHz (Typical)
Differential Probe
ZZZ
Instructions
xx
www.tektronix.com
071-0566-04

Copyright © Tektronix. All rights reserved. Licensed software products are
owned by Tektronix or its subsidiaries or suppliers, and are protected by national
copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending.
Information in this publication supersedes that in all previously published
material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
KlipChip, TwinFoot, TwinTip, and VariTip are trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.

Warranty
Tektronix 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, 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. Parts, modules and replacement products used by
Tektronix for warranty work may be new or reconditioned to like new performance. All
replaced parts, modules and products become the property of Tektronix.
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 WITH RESPECT TO THE
PRODUCT 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
ADV
ANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
[W2 – 15AUG04]

Table of Contents
General Safety Summary ............................................... iv
Environmental Considerations ......................................... vi
Preface................................................................... vii
Related Manuals................................................... vii
Getting Started............................................................ 1
Features and Accessories ....... . .......... . . ........ ...... . ........ 1
Installation ........................................................... 9
Operating Basics........................................................ 11
Input Voltage Limits .............................................. 11
Attenuation Settings............................................... 12
Probe Grounding .................................................. 12
Input Impedance and Probe Loading ............................ 13
Common-Mode Rejection ........................................ 14
Reference................................................................ 15
Problems with Single-Ended Measurements.................... 15
Differential Measurements ....................................... 15
Extending the Input Leads........................................ 17
Extending the Ground Lead ...................................... 18
Extending the Probe Output...................................... 18
Using the Probe with Other Instruments ........................ 19
Specifications ........................................................... 21
Warranted Characteristics ........................................ 21
Typical Characteristics............................................ 23
Nominal Characteristics .......................................... 26
P6248 1.7 GHz Differential Probe Instructions i

Table of Contents
List of Figures
Figure 1: Input connector of TEKPROBE interface................... 9
Figure 2: Using the short ground contact............................. 13
Figure 3: Typical probe input model.................................. 13
Figure 4: Simplified model of a differential amplifier............... 16
Figure 5: Twisting the Input Leads ................................... 18
Figure 6: Typical Common-Mode Rejection Ratio (÷1 and ÷10
attenuation) ........................................................ 24
Figure 7: Typical differential input impedance versus frequency . . 24
Figure 8: Probe head and compensation box dimensions . . ......... 25
ii P6248 1.7 GHz Differential Probe Instructions

Table of Contents
List of Tables
Table 1: Features and standard accessories . ......... . .......... . . ..... 1
Table 2: P6248 Probe tip accessory kit contents....................... 4
Table 3: Optional accessories and instrument options....... . ......... 6
Table 4: Warranted electrical characteristics......................... 21
Table 5: Typical electrical characteristics ............................ 23
Table 6: Typical mechanical characteristics.......................... 25
Table 7: Nominal electrical characteristics........................... 26
P6248 1.7 GHz Differential Probe Instructions iii

General Safety Summary
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.
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. Connect the probe reference lead to the circuit under test
before connecting the probe input. Disconnect the probe input and the
probe reference lead 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 probe reference lead 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 that there is
damage to this product, have it inspected by qualified service personnel.
Avoid Exposed Circuitry. Do not touch exposed connections and
components when power is present.
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.
iv P6248 1.7 GHz Differential Probe Instructions

General Safety Summary
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.
Symbols and 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.
The following symbol(s) may appear on the product:
P6248 1.7 GHz Differential Probe Instructions v

Environmental Considerations
Environmental Considerations
This section provides information about the environmental impact of
the product.
Product End-of-Life Handling
Observe the following guidelines when recycling an instrument or
component:
Equipment Recycling. Production of this equipment required the
extraction and use of natural resources. The equipment may contain
substances that could be harmful to the environment or human health
if improperly handled at the product’s end of life. In order to avoid
release of such substances into the environment and to reduce the use
of natural resources, we encourage you to recycle this product in an
appropriate system that will ensure that most of the materials are reused
or recycled appropriately.
This symbol indicates that this product complies with the
European Union’s requirements according to Directive
2002/96/EC on waste electrical and electronic equipment
(WEEE). For information about recycling options, check
the Support/Service section of the Tektronix Web site
(www.tektronix.com).
Restriction of Hazardous Substances
This product has been classified as Monitoring and Control equipment,
and is outside the scope of the 2002/95/EC RoHS Directive.
vi P6248 1.7 GHz Differential Probe Instructions

Preface
This manual contains instructions and specifications for using the
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 vii

Preface
viii P6248 1.7 GHz Differential Probe Instructions

Getting Started
The P6248 is a high-bandwidth differential probe with the TEKPROBE
interface. The P6248 probe has a bandwidth of 1.5 GHz (1.7 GHz
typical). The probe has low circuit loading, high common-mode
rejection, and comes with accessories that accommodate a wide variety
of applications.
The TEKPROBE interface is standard on Tektronix TDS series
oscilloscopes. If your oscilloscope does not have a TEKPROBE
interface, there are several optional adapters available that allow you to
use the P6248 probe. (See Table 3 on page 6.)
Features and Accessories
The features and standard accessories of the P6248 differential probe
are shown below. (See Table 1.)
Table 1: 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 an optional adapter. (See
Table 3 on page 6.)
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: Features and standard accessories (cont.)
Feature/Accessory Description
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: 016-1952-XX
Calibration certificate. Acertificate 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

Getting Started
Table 1: Features and standard accessories (cont.)
Feature/Accessory Description
Service manual. Provides procedures for verifying
the performance, adjusting, and maintaining the
P6248 differential probe.
Replacement part number: 071-0573-XX
Probe tip accessory kit. This kit contains the
accessories listed below, in a plastic case. For more
information on the individual accessories, refer to
Accessory Kit Contents. (See Table 2 on page 4.)
10Colormarkerb
ands
2 Tip savers
1 Solder-down adapter, one-inch
1 Solder-down adapter, three-inch
2 Y-lead adapters
2 Longhorn via adapters
8 Straight tip adapters
3MicroCK
Ttesttips
2 Ground leads
Replacement part number: 020-2702-XX
P6248 1.7 GHz Differential Probe Instructions 3

Getting Started
The contents of the probe tip accessory kit are described below. (See
Table 2.)
Table 2: P6248 Probe tip accessory kit contents
Accessory Description
Colormarkerbands. Attach matching pairs of the
color marker bands onto the cable at the head and
compensation box of each probe. The marker bands
enable quick verification of which probe is connected
to which instrument channel.
Ten color bands (5 pairs) are included with the probe.
Replacement part number:
016-1315-XX (package of 10)
Tip saver. Use the tip saver to prolong the life of
your probe tip contacts. The tip saver connects to
the probe and accepts the probe tip accessories,
bearing the wear of repeated connections of different
probe tips.
Two tip savers are included with the probe.
Replacement part number:
016-1781-XX (package of 2)
Solder Down adapter. Use the Solder-Down
adapter to probe common test points in your circuit.
The adapter is available in two lengths: 1 inch and
3 inches. One of each length is provided with the
probe.
The adapters include integral resistors for best signal
fidelity. The 1 inch adapter can span up to 1.5 inches
between test points, and the 3 inch adapter can span
up to 5.5 inches.
NOTE. The 3 inch adapter performance is best
below 500 MHz. The 1 inch adapter performance is
best below 1 GHz.
Replacement part numbers:
1 inch: 196-3504-XX (1 ea)
3 inch: 196-3505-XX (1 ea)
4 P6248 1.7 GHz Differential Probe Instructions

Getting Started
Table 2: P6248 Probe tip accessory kit contents (cont.)
Accessory Description
Y-lead adapter. The Y-lead adapter plugs directly
into the probe. The socketed ends of the leads may
be connected to the probe tips and accessories, or
fitted onto 0.025-inch pins.
Two Y-lead adapters are included with the probe.
Replacement part number: 196-3434-XX (1 ea)
Longhorn via adapter. This accessory is similar to
the TwinTip adapter, but it has finer pins for probing
smaller holes. Use this accessory for probing circuit
board through-holes (vias).
Two Longhorn adapters are included with the probe.
Replacement part number:
016-1780-XX (package of 5)
Straight tip adapter. The straight tip adapters
plug directly into the probe and allow you to take
measurements from two points spaced 0.100 inches
apart. Use the straight tip adapters when you need
to measure fast waveforms that may be affected by
the longer length of other adapters.
Eight adapters are included with the probe.
Replacement part number:
016-1891-XX (package of 8)
MicroCKT Test Tip adapter. Use this accessory to
probe the leads on dual-in-line packages (DIP).
Three adapters are included with the probe.
Replacement part number: 206-0569-XX (1 ea.)
Ground leads. Use the ground leads for connecting
the probe ground to the circuit. The socketed end
of the lead may be connected to the probe tips and
accessories, or fitted onto 0.025-inch pins.
Two ground leads are included with the probe.
Replacement part number: 196-3437-XX (1 ea)
P6248 1.7 GHz Differential Probe Instructions 5

Getting Started
The optional accessories that you can order for the P6248 differential
probe are shown below. (See Table 3.)
Table 3: Optional accessories and instrument options
Accessory/Option Description
TPA–BNC Adapter.
Use this adapter to connect the P6248 probe to
Tektronix oscilloscopes that feature the TekVPI
interface.
TCA–BNC Adapter.
Use this adapter to connect the P6248 probe to
Tektronix oscilloscopes that feature the TekConnect
interface.
1103 Power supply. Use the 1103 power supply
for instruments that only have a BNC-connector
interface. Power cord options are available for the
following countries or regions.
Standard. North America and Japan
Option A1. European
Option A2. UK
Option A3. Australia
Option A5. Switzerland
50 Ωtermination. Terminates the output of the 1103
power supply to the required 50 Ωif the oscilloscope
does not have a 50 Ωinput setting.
Replacement part number: 011-0049-XX.
50 ΩBNC cable, 20 in. length. Connects to the
1103 output.
Replacement part number: 012-0076-XX
6 P6248 1.7 GHz Differential Probe Instructions