Tektronix P6249 User Manual
Instruction Manual
P6249
4 GHz 5X Active Probe
071-0538-03
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 and TEK are registered trademarks of Tektronix, Inc.
TEKTRONIX, TEK, TEKPROBE, and SureFoot are registered trademarks,
and SureToe, FlexLead, and KlipChip are trademarks of Tektronix, Inc.
WARRANTY
T ektronix 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. T ektronix 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 v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description
Options 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting Tektronix 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features and Accessories
Configuration
Probe Offset 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Check
Deskew Fixture 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Calibration Errors 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Compatibility 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check for Hardware Problems 17. . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics
Handling the Probe 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Non-destructive Input Voltage 19. . . . . . . . . . . . . . . . .
Input Linear Dynamic Range 19. . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground Lead Length 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Helpful Hints
Low-Inductance Grounding 23. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SureFoot Grounding 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Tip Test Points 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P6249 4 GHz 5X Active Probe Instruction Manual
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Table of Contents
Specifications
Theory of Operation
Probe Head and Cable Assembly 36. . . . . . . . . . . . . . . . . . . . . . .
Compensation Box 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Amplifier 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Identification EEPROM 36. . . . . . . . . . . . . . . . . . . . . . . . .
TEKPROBE Interface 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC, +7 V Regulator 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Equipment Required 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Setup 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Zero 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Attenuation Accuracy 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments
Adjustment Locations 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Zero 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Range 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Replacing TEKPROBE Interface Pins 53. . . . . . . . . . . . . . . . . . .
Removing and Replacing the Compensation Box Covers 54. . . . .
Removing and Replacing the TEKPROBE Interface Collar 56. . .
Inspection and Cleaning 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Parts 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Shipment 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
Replaceable Parts
Parts Ordering Information 63. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 64. . . . . . . . . . . . . . . . . . . . . . . .
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P6249 4 GHz 5X Active Probe Instruction Manual
List of Figures
Figure 1: Dynamic and offset limitations 12. . . . . . . . . . . . . . . . .
Figure 2: Probe functional check connections 13. . . . . . . . . . . . . .
Figure 3: Deskew fixture connections
(two P6249 probes shown) 15. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4: Maximum frequency vs. measurement lead length 21. .
Figure 5: Low-inductance grounding 23. . . . . . . . . . . . . . . . . . . .
Figure 6: Using a SureFoot adapter for grounding 24. . . . . . . . . .
Figure 7: Using a probe tip as a test point 25. . . . . . . . . . . . . . . . .
Figure 8: Typical input impedance and phase versus frequency 28
Figure 9: Typical bandwidth 29. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10: P6249 simplified schematic diagram 35. . . . . . . . . . . .
Figure 11: TEKPROBE interface 37. . . . . . . . . . . . . . . . . . . . . . .
Figure 12: Setup for output zero and DC attenuation accuracy 41
Figure 13: Test system rise time setup 44. . . . . . . . . . . . . . . . . . . .
Figure 14: Test system and probe rise time setup 45. . . . . . . . . . .
Figure 15: P6249 adjustment locations 49. . . . . . . . . . . . . . . . . . .
Figure 16: 1103 power supply of fset voltage location 51. . . . . . . .
Figure 17: P6249 offset range setup 52. . . . . . . . . . . . . . . . . . . . .
Figure 18: Replacing TEKPROBE interface pins 53. . . . . . . . . . .
Figure 19: Removing the compensation box covers 54. . . . . . . . .
Figure 20: Replacing the compensation box cover 55. . . . . . . . . .
Figure 21: Replacing the TEKPROBE interface collar 56. . . . . . .
Figure 22: Compensation box test point locations 60. . . . . . . . . .
Figure 23: P6249 replaceable parts 65. . . . . . . . . . . . . . . . . . . . . .
Figure 24: P6249 standard accessories 66. . . . . . . . . . . . . . . . . . .
Figure 25: P6249 optional accessories 68. . . . . . . . . . . . . . . . . . .
Table of Contents
P6249 4 GHz 5X Active Probe Instruction Manual
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Table of Contents
iv
P6249 4 GHz 5X Active 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.
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 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 .
P6249 4 GHz 5X Active Probe Instruction Manual
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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:
CAUTION
Refer to Manual
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P6249 4 GHz 5X Active Probe Instruction Manual
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.
P6249 4 GHz 5X Active Probe Instruction Manual
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Service Safety Summary
viii
P6249 4 GHz 5X Active Probe Instruction Manual
Product Description
The Tektronix P6249 is a 4 GHz (probe only), 5X active FET probe
with 1 pF input capacitance. The P6249 has a low input capacitance
and high input resistance which minimize circuit loading over a wide
bandwidth range. The small profile and low-mass head of the P6249
make probing crowded circuits by hand fast and easy. The accessory
tips and adapters included with the probe enable the P6249 to be
used on a wide variety of circuit architectures.
The P6249 is powered through a TEKPROBE interface between the
probe compensation box and the oscilloscope. The P6249 can be
used with non-TEKPROBE oscilloscopes and instruments by using
the optional Tektronix 1103 Probe Power Supply .
Options
The following options are available when ordering the P6249 probe:
H Option D1 – Calibration Data
H Option C3 – 3 years Calibration Service
H Option D3 – 3 years Calibration Data
H Option R3 – 3 years Extended Warranty
Standard Accessories
The P6249 is shipped with the following standard accessories:
H Standard probe tips
H SureFoot adapter probe tips
H SureToe adapter probe tips
H SMT KlipChip microcircuit test leads
H Y-lead adapter
P6249 4 GHz 5X Active Probe Instruction Manual
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Product Description
H Right-angle adapter
H Three-inch ground lead
H Low-inductance ground pogo pin
H Color marker bands
H SMK4 Micro KlipChip adapters
H .100” square pin adapter
H Instruction manual
Optional Accessories
The following accessories are available for the P6249 probe:
H Deskew fixture
H Probe tip-to-SMA adapter
H 1103 Probe Power Supply
H Compensation box release tool
H Insulated adjustment tool
Refer to Features and Accessories on page 5 for more information on
using the probe and accessories.
For part number information for standard and optional accessories,
refer to Replaceable Parts on page 63.
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P6249 4 GHz 5X Active Probe Instruction Manual
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
Product Description
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 T ektronix 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
P6249 4 GHz 5X Active Probe Instruction Manual
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Product Description
4
P6249 4 GHz 5X Active Probe Instruction Manual
Features and Accessories
The P6249 is provided with several features and accessories designed
to make probing and measurement a simpler task. Please familiarize
yourself with these items and their uses.
Probe head assembly. The probe head is
designed for ease of use and high performance.
Its small size makes it easy to handle in tight
Probe tip
socket
Ground
socket
Stabilization
notch
areas.
The probe tip socket is sized to easily press onto
0.025 inch pins for direct access. The ground
socket provides a short ground path for high
fidelity ground connections.
The stabilization notch permits you to use
adjacent pins to reduce stresses on the probe
and pins.
Push-in probe tip
TEKPROBE Interface. The TEKPROBE
interface provides a communication path between
the probe and the oscilloscope. Contact pins
provide power, signal, offset, and probe
characteristic data transfer. See page 37 for more
information.
If your oscilloscope does not support the
TEKPROBE interface, you can use the optional
1103 probe power supply as an effective
interface. Contact your local Tektronix representative for more information.
Push-in probe tip. Use the push-in probe tip
for general purpose probing by hand. The tip may
also be used as a temporary test point. See
page 25 for more information.
The push-in probe tip may also be used with the
other socketed leads and adapters.
P6249 4 GHz 5X Active Probe Instruction Manual
5
Features and Accessories
Installing the push-in probe tip. Attach the
push-in probe tip by seating the tip into the probe
tip socket and pushing the tip in until it is seated.
Either end of the tip may be used.
Do not force the tip. Also, be careful not to poke
yourself with the sharp probe-tip. To remove the
tip, gently grab the tip with small pliers and pull
the tip out.
SureFoot probe tip. The SureFoot tip is an
integral probe tip and miniature guide that
enables fault-free probing of fine-pitch SMD
packages. Attach SureFoot adapters the same
way as the push-in probe tips. They can be used
with any of the socketed accessory leads.
The orange, 0.050 inch SureFoot tip is compatible
with 50 mil JEDEC packages such as SOIC,
PLCC, CLCC, etc.
The blue, 0.025 inch SureFoot tip is compatible
with 0.65 mm JEDEC and EIAJ packages.
The red, 0.5 mm SureFoot tip is compatible with
EIAJ packages.
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P6249 4 GHz 5X Active Probe Instruction Manual
Features and Accessories
SureToe probe tip. The SureToe tip is a pointed
probe tip useful for probing in dense circuitry.
Attach the SureToe adapters the same way as
the push-in probe tips. Do not force the tip. Also,
be careful not to poke yourself with the sharp
probe tip. They can be used with any of the
socketed accessory leads.
Right-angle adapter . Use the right-angle
adapter for low-profile probing of 0.025 inch
diameter square pins.
The right-angle adapter allows the probe to lie flat
against a circuit board. This enables probing in
vertical circuits such as computer or communications backplanes, or in tight areas such as
between circuit cards.
Y-lead
adapter
Y-lead
adapter
Right
angle
adapter
The right-angle adapter can be used directly with
the probe head, or attached to the Y-lead adapter
or ground leads.
The right-angle adapter is attached the same way
as the push-in probe tip, and can be easily
removed by hand.
Y-lead adapter. Use the Y-lead adapter to
extend the physical reach of the probe and
ground when necessary. The Y-lead adapter
accepts any of the probe tips or adapters, and
can be pushed directly onto 0.025 inch pins.
When selecting the grounding connection,
maintain as short a ground path as possible.
Refer to page 20 for more information.
To attach the Y-lead adapter, gently press the
lead pins into the probe head tip and ground
receptacles. Using the black lead for ground is
recommended.
P6249 4 GHz 5X Active Probe Instruction Manual
7
Features and Accessories
Pogo pin
Three-inch ground lead. Use the three-inch
ground lead for general probing. The socketed
end of the lead may be connected to any of the
probe tips and adapters or fitted onto 0.025 inch
pins.
To attach the ground lead, press and rotate the
lead pin connector into the ground socket on the
probe head. The lead may be removed by simply
pulling the pin out by hand.
When selecting the grounding connection,
maintain as short a ground path as possible.
Refer to page 20 for more information.
Low-inductance ground pogo pin. Use the
low-inductance ground pogo pin to substantially
reduce ground lead inductance. Because the
pogo pin simply touches the ground reference,
you can easily move the probe to different points
on the circuit under test.
To attach, press the pogo pin into the probe head
ground socket.
Signal ground
adapter
FlexLead
adapter
When selecting the grounding connection,
maintain as short a ground path as possible.
Refer to page 20 for more information.
Signal-Ground Adapter. The signal-ground
adapter is ideal for use with signal/ground pairs
on 0.100 inch header pins (such as FlexLead
adapters).
Attach the signal-ground adapter by gently
pressing it into the ground socket on the probe
head.
Be sure to use the stabilization notch whenever
possible, to avoid slipping and damaging the
probe or circuitry under test.
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P6249 4 GHz 5X Active Probe Instruction Manual
KlipChip
Features and Accessories
SMT KlipChip. Use the SMT KlipChip test clips
to access fragile, dense circuitry.
KlipChip test clips can be connected to the Y-lead
or three-inch ground leads. Simply press the lead
socket into the KlipChip handle.
Y-lead adapter
Color marker
bands
The KlipChip body freely turns, allowing better
probe orientation. To reduce stress and provide a
lower profile on components being tested, the
flexible sleeve of the KlipChip bends up to a
35 degree angle.
SMK4 Micro KlipChip adapters. Use the
adapters to probe the leads on integrated circuits
that are surface-mounted.
Color marker bands. 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.
P6249 4 GHz 5X Active Probe Instruction Manual
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Features and Accessories
10
P6249 4 GHz 5X Active Probe Instruction Manual
Configuration
The P6249 provides the oscilloscope with the probe model number,
serial number, and attenuation factor. When connected to an
oscilloscope with a TEKPROBE interface, display readouts are
corrected for the probe attenuation factor, the instrument input is set
to 50 W, and the coupling is set to DC.
CAUTION. Do not attempt to install the P6249 on a non-TEKPROBE
connector. Damage to the probe and connector may result. If your
oscilloscope does not support the TEKPROBE interface, use the
optional Tektronix 1103 Probe Power Supply.
If the P6249 is used with the Tektronix 1103 Probe Power Supply, be
sure to have a 50 W termination at the oscilloscope. Also, set the
oscilloscope channel coupling to DC.
The probe offset control is controlled by the oscilloscope. If the
oscilloscope used does not support the TEKPROBE interface, use the
offset controls on the optional Tektronix 1103 Probe Power Supply.
Probe Offset
The probe offset is adjustable to permit operation within the linear
range of the probe. Using the offset to cancel DC signal components
enables optimal probe performance. See Figure 1 on page 12 for
more information.
NOTE. See your oscilloscope manual for specific instructions on its
operation and offset control.
P6249 4 GHz 5X Active Probe Instruction Manual
11
Configuration
To set the probe offset, follow these steps:
1. Set the oscilloscope coupling to GND.
2. Use the vertical position control to set a zero reference level on
3. Set the oscilloscope coupling to DC and 5 V/div.
4. Attach the probe to the circuit.
5. Adjust the probe offset to bring the trace to the oscilloscope zero
6. Change the volts/division setting to the desired range, adjusting
NOTE. The P6249 has a ±5.0 V offset range. The linear operating
range is ±2.0 V. See Figur e 1. Also, see page 19 for more information.
the oscilloscope display .
reference.
the offset to keep the trace on the zero reference level.
If cursors are used on a TEKPROBE oscilloscope, the zero reference
will be at the probe offset voltage.
Nonoperating range (+30 V maximum nondestructive input voltage )
+7.0 V
+5.0 V
+2.0 V
0 V
–2.0 V
–5.0 V
–7.0 V
Nonoperating range (–30 V maximum nondestructive input voltage )
+5.0 V
Maximum offset rangeMaximum AC signal amplitude
–5.0 V
Figure 1: Dynamic and offset limitations
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P6249 4 GHz 5X Active Probe Instruction Manual
Functional Check
After installing the probe on the oscilloscope, a functional check
may be performed using the PROBE COMPENSATION connections
on the front panel of the oscilloscope. Use the optional deskew
fixture for optimum connections. See Figure 2.
A
B
Deskew fixture
Figure 2: Probe functional check connections
1. Connect the probe to the oscilloscope.
2. Set the oscilloscope to display the probe channel.
P6249 4 GHz 5X Active Probe Instruction Manual
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