Tektronix P7350SMA User manual
Instruction Manual
P7350SMA
5 GHz Differential Probe
071-1264-01
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 © 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 TekConnect 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
Preface v............................................
Contacting Tektronix vi.................................
General Safety Summary vii..............................
Service Safety Summary ix..............................
Getting Started 1.....................................
Features and Standard Accessories 2......................
Optional Accessories 5.................................
Options 6............................................
P7350SMA Probe Head 7...............................
TekConnect Interface 9.................................
Functional Check 10....................................
Signal Check 10.......................................
DC Termination Check 11...............................
Probe Calibration 13....................................
Probe Applications 14...................................
Operating Basics 15...................................
Input Circuitry 15......................................
Probe Termination Network 16...........................
Differential Signals 16..................................
Single-Ended Signals 17.................................
Matched-Delay Cables 19...............................
DC Termination Voltage Input 21.........................
Calculating DC Termination Resistor Power 22..............
DC Voltage Applied to SMA Inputs with the
DC Termination Voltage Input Grounded 23..............
Complementary Input Signal with the
DC Termination Voltage Input Open 24..................
Complementary Input Signal with the
DC Termination Voltage Input Shorted (Grounded) 26......
Equations and Definitions 28.............................
Internal Probe Amplifier 29..............................
Maximum Input Voltage 29..............................
Common-Mode Signal Range 29..........................
Differential-Mode Signal Range 29........................
Differential Offset Range 30.............................
Common-Mode Rejection 31.............................
Input Impedance and Probe Loading 31.....................
P7350SMA 5 GHz Differential Probe Instruction Manual
i
Table of Contents
Checking the Skew Between Inputs 32.....................
Adjusting Cable Skew 33................................
Deskewing Probes 35...................................
Reference 39.........................................
Differential Measurements 39............................
Common-Mode Rejection Ratio 40........................
Extending the Input Connections 41.......................
InfiniBand 42.........................................
Appendix A: Specifications 43...........................
Warranted Characteristics 43.............................
Typical Characteristics 44...............................
Nominal Characteristics 48..............................
Mechanical Characteristics 48............................
Appendix B: Performance Verification 51.................
Equipment Required 51.................................
Special Adapters Required 53............................
TekConnect-to-SMA Adapter 53..........................
TekConnect Interface Calibration Adapter 54................
Equipment Setup 55....................................
Input Resistance 56.....................................
Output Offset Zero 57...................................
DC Gain Accuracy 58...................................
Rise Time 60..........................................
Appendix C: Maintenance 67...........................
Inspection and Cleaning 67..............................
Replacement Parts 68...................................
Preparation for Shipment 68..............................
Appendix D: Replaceable Parts 69.......................
Parts Ordering Information 69............................
Using the Replaceable Parts List 70........................
Item Names 70........................................
Indentation System 70..................................
Abbreviations 70.......................................
ii
P7350SMA 5 GHz Differential Probe Instruction Manual
List of Figures
Figure 1: P7350SMA differential probe 1..................
Figure 2: Probe head connections 8.......................
Figure 3: Connecting and disconnecting the probe 9..........
Figure 4: Probe signal check setup 10......................
Figure 5: Probe DC termination c heck 12...................
Figure 6: Typical probe applications and configurations 14.....
Figure 7: Simplified probe schematic 15....................
Figure 8: Single-ended drive 17...........................
Figure 9: Resultant waveform from an unterminated input 18...
Figure 10: Distorted pulse edge 20.........................
Figure 11: Worst-case power dissipation example 23..........
Figure 12: Example of probe with DC input open 24..........
Figure 13: Example of probe with DC input shorted to ground 26
Figure 14: Probe amplifier and offset circuit 30..............
Figure 15: Typical probe input model 31....................
Figure 16: Checking skew between inputs 33................
Figure 17: Using the phase adjuster 34.....................
Figure 18: Deskewing two P7350SMA probes 36.............
Figure 19: Simplified model of a differential amplifier 39......
Figure 20: InfiniBand signals 42..........................
Figure 21: Typical common- and differential-mode gain plots 46
Figure 22: Typical differential input return loss 47............
Figure 23: Typical differential-mode bandwidth 47............
Figure 24: Probe head and compensation box dimensions 49....
Figure 25: TekConnect-to-SMA Adapter 53.................
Figure 26: TekConnect Interface Calibration Adapter 54.......
Figure 27: Checking differential mode input resistance 56......
Figure 28: Setup for the output offset zero test 57.............
Figure 29: DC Gain Accura cy setup 58.....................
Figure 30: Reverse the power supply polarity
on the probe inputs 59................................
Figure 31: Test system rise time setup 61...................
Figure 32: Setting the TDR parameters 62...................
Figure 33: Test system rise time setup with probe 64..........
Figure 34: Replaceable parts 71...........................
Figure 35: Standard accessories 72........................
Figure 36: Optional accessories 74.........................
Table of Contents
P7350SMA 5 GHz Differential Probe Instruction Manual
iii
Table of Contents
iv
P7350SMA 5 GHz Differential Probe Instruction Manual
Preface
This is the Instruction Manual for the P7350SMA differential probe.
This manual provides operating information, specifications,
performance verification procedures, and a replaceable parts list.
P7350SMA 5 GHz Differential Probe Instruction Manual
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
1-800-833-9200, select option 1*
support
Service
1-800-833-9200, select option 2*
support
Technical
www.tektronix.com/support
support
1-800-833-9200, select option 3*
6:00 a.m. -- 5:00 p.m. Pacific Standard Time
* 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.
vi
P7350SMA 5 GHz Differential Probe Instruction Manual
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.
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 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.
The common terminal is at ground potential. Do not connect the
common terminal to elevated voltages.
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.
P7350SMA 5 GHz Differential Probe Instruction Manual
vii
General Safety Summary
Safety Terms and Symbols
Terms in This Manual. These terms may appear in this manual:
WARNING. Warning statements identify condit ions 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:
CAUTION
Refer to Manual
viii
P7350SMA 5 GHz Differential Probe Instruction Manual
Service Safety Sum mary
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.
P7350SMA 5 GHz Differential Probe Instruction Manual
ix
Service Safety Summary
x
P7350SMA 5 GHz Differential Probe Instruction Manual
Getting Started
The P7350SMA is a 5 GHz, active differential probe designed for
Serial Data Analysis (SDA) compliance testing and other applications that use differential serial busses in a 50 Ω signaling environ-
ment. The SMA input connectors each terminate with an internal
50 Ω resistor. Banana plug terminals on the probe head provide
inputs for a common-mode DC termination voltage. The probe
incorporates the high-performance TekConnect interface to
communicate with the host instrument.
Figure 1: P7350SMA differential probe
The probe is shipped with 50 Ω termination caps connected to the
SMA inputs. When you make single-ended measurements, leave one
of the termination caps on the unused input to provide a clean, 50 Ω
termination for the single-ended signal. When you are not using the
probe, leave both of the termination caps connected to protect the
SMA inputs from damage.
P7350SMA 5 GHz Differential Probe Instruction Manual
1
Getting Started
Features and Standard Accessories
Table 1 shows the features and standard accessories of the
P7350SMA differential probe.
Table 1: P7350SMA features and standard accessories
Feature/Accessory Description
TekConnect interface. The TekConnect interface provides a
communication path between the probe and the oscilloscope.
Contact pins provide power, signal, offset, and probe characteristic data transfer.
The probe snaps into the oscilloscope when fully engaged. To
remove, grasp the compensation box, press the latch button, and
pull the probe out.
For more information, see page 9.
Input connections. The SMA terminals provide shielded,
low-noise connections to your circuit. Differential or single-ended
signals are buffered by the internal probe amplifier and are sent
through the TekConnect interface to the oscilloscope.
See Operating Basics on page 15 for more information.
External DC termination voltage connections. The red and
black banana jacks on the probe head provide a means for
connecting an external DC voltage to the internal termination
network, for drivers that require a DC termination voltage.
You should use shielded test cables when connecting external DC
voltages to these terminals. For example, use a coaxial BNC
cable and a BNC-to-dual banana plug adapter.
Caution: The internal termination resistors are rated for 500 mW.
To prevent exceeding these limits, see page 22 for information on
calculating power dissipation and other related topics.
2
P7350SMA 5 GHz Differential Probe Instruction Manual
Table 1: P7350SMA features and standard accessories (Cont.)
Feature/Accessory Description
Male SMA termination (2 ea). Protect the probe input circuitry by
connecting the termination to the probe SMA input connector
when the probe is not in use. When making single-ended
measurements in a 50 Ω environment, use one of these
terminations on the unused input.
The probe is shipped with the terminations connected to the probe
SMA inputs.
Tektronix part number: 015-1022-01
Dual SMA cables. These 12-in cables are bound together and
have a skew of less than 10 ps. The cables provide matched
signal paths from your circuit to the probe to ensure more
accurate differential signal measurements.
Getting Started
Markers
Tektronix part number: 174-4866-XX
Dual banana shorting plug. Use the shorting plug when you are
calibrating the probe, or when you need to bring the commonmode node of the termination network to ground.
Tektronix part number: 012-1667-XX
Cable marker bands (10 ea). Attach matching pairs of the
marker bands onto the cable at both the head and compensation
box of each probe. The marker bands allow you to quickly verify
which instrument channel your probe is connected to when you
are using multiple channels.
Tektronix part number: 016-1886-XX (package of 10)
SMA Female-to-BNC Male adapter. Use the adapter to connect
the probe SMA inputs to BNC connections, such as the BNC
calibration output connector on your oscilloscope.
Tektronix part number: 015-0572-XX
P7350SMA 5 GHz Differential Probe Instruction Manual
3
Getting Started
Table 1: P7350SMA features and standard accessories (Cont.)
Feature/Accessory Description
Antistatic wrist strap. When using the probe, always work at an
antistatic work station and wear the antistatic wrist strap.
Tektronix part number: 006-3415-XX
Calibration certificate. A certificate of traceable calibration is
provided with every instrument shipped.
Instruction Manual. Provides instructions for operating and
maintaining the P7350SMA differential probe.
Tektronix part number: 071-1264-XX
Carrying case with inserts. The soft-sided nyloncarrying casehas
several compartments to hold the probe, accessories, and related
documentation. Use the case to store or transport the probe.
Tektronix part number 016-1952-XX
4
P7350SMA 5 GHz Differential Probe Instruction Manual
Optional Accessories
Table 2 shows the optional accessories that you can order for the
P7350SMA differential probe.
Table 2: Optional accessories
Accessory Description
BNC-to-dual banana plug adapter. Use these adapters with
BNC cables to provide a shielded path to the DC termination
voltage terminals on the probe.
Tektronix part number: 103-0090-XX
Getting Started
Phase adjuster. Use two phase adjusters if you need to bring the
skew between inputs to 1 ps or less when you use the
matched-delay SMA cables to connect to your circuit.
The matched-delay SMA cables that come with your probe have a
≤10 ps warranted skew at the cable ends.
Tektronix part number: 015-0708-XX
SMA Male-to-Male adapter. Use the adapter to connect the
probe SMA inputs to other SMA female connections, such as
those on your test fixture or sampling head. See Figure 24 on
page 49 for SMA connector spacing dimensions.
Tektronix part number: 015-1011-XX
TekConnect interface calibration adapter. The calibration
adapter is required when a performance verification or adjustment
is done on the probe. It provides connectors and test points for
internal probe measurements.
Tektronix part number: 067-0422-XX
P7350SMA 5 GHz Differential Probe Instruction Manual
5
Getting Started
Options
The following options are available when ordering the P7350SMA
probe:
H Option D1--Calibration Data Report
H Option D3--Calibration Data Report, 3 years (with Option C3)
H Option C3--Calibration Service 3 years
H Option D5--Calibration Data Report, 5 years (with Option C5)
H Option C5--Calibration Service 5 years
H Option R3--Repair Service 3 years
H Option R5--Repair Service 5 years
6
P7350SMA 5 GHz Differential Probe Instruction Manual
P7350SMA Probe Head
The P7350SMA probe has two pairs of inputs, shown in Figure 2 on
page 8:
H The SMA connectors provide a signal path through the internal
50 Ω termination network to the oscilloscope.
Use the matched-delay SMA cables that are supplied with the
probe to connect the probe to your circuit.
You can mate the probe directly to your circuit if your connector
layout matches those on the probe. See Specifications on page 43
for the dimensions, and use the optional SMA Male-to-Male
adapters.
Leave the 50 Ω termination caps on the unused inputs.
Getting Started
H Banana jacks are provided for external DC termination voltages,
which expand the measurement capabilities of your probe. The
center-tap (common-mode node) of the internal 50 Ω termination
network is connected to the red banana-jack terminal on the
probe head. The black banana-jack terminal is connected to
system ground.
CAUTION. The input termination resistors have a thermal power
rating of 0.5 W and are subject to damage if an excessive DC plus
AC rms signal is applied. To prevent damaging the probe, see
page 22 for instructions on calculating the termination resistor
power.
Generally, if you are taking differential measurements on
complementary signals, you should leave the DC terminals open.
Short the DC terminals together with the banana-plug shorting
strap when you are making lower speed, single-ended measure-
ments. A low impedance connection from the DC termination
voltage input to ground is required when measuring single-ended
signals with frequency content below 7 MHz.
If the signal driver requires you to sink or source DC current, use
the DC terminals to bring in an external termination voltage.
P7350SMA 5 GHz Differential Probe Instruction Manual
7
Getting Started
BNC-to-Dual
Banana Adapter
BNC cable
(optional)
To power
supply
(optional)
Shorting strap
(Leave open)
DC termination input options
Cables
SMA couplers
(optional)
50 Ω
Termination
caps
SMA input options
Figure 2: Probe head connections
Mounting holes are provided on the bottom of the probe head to
secure the probe to your test fixture or device under test. See
Specifications on page 43 for the mounting hole dimensions and
locations.
8
P7350SMA 5 GHz Differential Probe Instruction Manual
TekConnect Interface
The P7350SMA probe is powered through a TekConnect interface
between the probe compensation box and the host instrument. The
TekConnect interface provides a communication path through
contact pins on the host instrument. Power, signal, offset, and probe
characteristic data transfer through the interface.
When the probe is connected, the host instrument reads EEPROM
information from the probe, identifying the device and allowing the
appropriate power supplies to be turned on. The preamp inputs on the
host instrument are ESD protected by remaining grounded until a
valid TekConnect device is detected.
The TekConnect interface features a spring-loaded latch t hat
provides audible and tactile confirmation that a reliable connection
has been made to the host instrument. Slide the probe into the
TekConnect receptacle on the host instrument. The probe snaps into
the receptacle when fully engaged. See Figure 3.
Getting Started
To release the probe from the host instrument, grasp the compensation box, press the latch button, and pull out the probe.
Latch button
Figure 3: Connecting and disconnecting the probe
P7350SMA 5 GHz Differential Probe Instruction Manual
9
Getting Started
Functional Check
Before using your probe, you should perform a functional check on
your probe. Figure 4 illustrates a typical setup using the PROBE
COMPENSATION output on the front panel of the oscilloscope.
Probe Compensation
TDS7404 Oscilloscope
output
BNC-SMA
adapter
SMA cable
Reverse c onnections
to check (+ ) input
Shorting strap
50 Ω
Termination
Figure 4: Probe signal check setup
Signal Check
1. Connect the probe to one of the oscilloscope channels, and set the
oscilloscope to display the channel. Allow the probe and
oscilloscope to warm up for at least 20 minutes.
10
2. Connect the BNC--SMA adapter (included with your probe) to the
PROBE COMPENSATION connector on the oscilloscope.
3. Connect an SMA cable between the adapter and the (--) SMA
probe input. (You can use one cable of the matched-delay cable
set included with your probe.)
P7350SMA 5 GHz Differential Probe Instruction Manual
Getting Started
4. Connect a 50 Ω SMA termination to the (+) SMA probe input.
5. Connect a shorting strap or test lead between the two DC
termination inputs on the probe. (Due to the low repetition rate of
the oscilloscope calibration signal, the shorting strap is needed to
provide a broadband 50 Ω termina tion to ground.)
6. Press Autoset or adjust the oscilloscope to display a stable
calibration waveform. A stable square wave indicates that the
probe input that you are using is functional. Signal amplitude is
dependent on oscilloscope model.
7. Reverse the probe SMA connections, and repeat step 6 to check
the (+) input.
DC Termination Check
8. Disconnect the SMA cable from the (+) input of the probe. Leave
the 50 Ω SMA termination connected to the (--) probe input.
9. Disconnect the shorting strap or test lead from the two DC
termination inputs on the probe.
10. Turn on the power supply, and set it to 0 volts.
11. Connect the power supply to the probe with a BNC cable and two
BNC-to-dual banana adapters. The test setup is shown in Figure 5
on page 12.
P7350SMA 5 GHz Differential Probe Instruction Manual
11
Getting Started
TDS7404 Oscilloscope
Power supply
BNC-to-Dual
Banana Adapter
--
+
BNC-to-Dual
Banana Adapter
+
Leave ( +) SMA input open
BNC cable
--
50 Ω Termination
Figure 5: Probe DC termination check
12. Press Autoset or adjust the oscilloscope to center the trace.
13. Set the oscilloscope volts/division to 200 mV.
14. Adjust the power supply between approximately +1.0 V and
--1.0 V. The trace of a functional probe will vary between
approximately +0.5 V and --0.5 V (about 5 divisions).
15. Move the 50 Ω SMA termination to the (+) SMA probe input.
16. Adjust the power supply between approximately +1.0 V and
--1.0 V. The trace of a functional probe will vary inversely
(between approximately --0.5 V and +0.5 V, about 5 divisions).
12
This completes the functional check of the probe. If your instrument
supports probe calibration routines, now is a good time to perform
them. See Probe Calibration on page 13 for instructions.
P7350SMA 5 GHz Differential Probe Instruction Manual
Probe Calibration
After you perform a functional check of the probe, you should run a
probe calibration routine. The Calibration Status of the instrument
Signal Path Compensation test must be pass for the probe calibration
routine to run:
1. From the Utilities menu, select Instrument Calibration.
2. In the Calibration box, check that the Status field is pass.Ifitis
not, disconnect all probes and signal sources from the oscillo-
scope, and run the Signal Path Compensation routine.
When the Signal Path Compensation test status is pass, run the probe
calibration routine:
3. Connect the probe to one of the oscilloscope channels, and set the
oscilloscope to display the channel. Allow the probe to warm up
for 20 minutes.
Getting Started
4. Connect the SMA cable from the PROBE COMPENSATION
connector on the oscilloscope to the (+) SMA probe input. Leave
a50Ω termination on the (--) SMA probe input. The test setup is
shown in Figure 4 on page 10, except the SMA inputs are
reversed.
5. Connect the shorting strap or test lead to the two DC termination
inputs on the probe. The DC termination voltage banana plug
input must be shorted to the banana plug ground input because
the single-ended Probe Compensation signal is a variable DC
voltage.
6. From the Vertical menu, select Probe Cal.
7. Press or click Calibrate probe.
After the probe passes the functional checks and probe calibration
routine, you can use the probe in your measurement system.
You should read the Operating Basics section to familiarize yourself
with related probe functions and capabilities. Important topics
include the Probe Termination Network, Matched-Delay Cables,and
the DC Termination Voltage Terminals.
P7350SMA 5 GHz Differential Probe Instruction Manual
13