Tektronix P6245AD User manual
Instruction Manual
P6245AD
10X Active Probe
-0687-00
071
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, TEKPROBE, and SureFoot are registered trademarks of
Tektronix, Inc.
FlexLead and KlipChip are trademarks of Tektronix, Inc.
WARRANTY
Tektronix warrants that this product will be free from defects in materials and
workmanship for a period of three (3) months from the date of shipment. If any such
product proves defective during the three–month 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 respective 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
LISTED PRODUCTS 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 OR 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
Getting Started
General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting Tektronix viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features and Accessories 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Offset 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Check 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics
Operating Basics 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Nondestructive Input Voltage 2–1. . . . . . . . . . . . . . . . . .
Input Linear Dynamic Range 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground Lead Length 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Helpful Hints 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low-inductance Grounding 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SureFoot Grounding 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Tip Test Points 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Tip Stabilization 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Specifications 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Information
Theory of Operation 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Head and Cable Assembly 4–1. . . . . . . . . . . . . . . . . . . . . . .
Compensation Box 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Amplifier 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Identification EEPROM 4–2. . . . . . . . . . . . . . . . . . . . . . .
P6245AD Instruction Manual
i
Table of Contents
TEKPROBE Interface 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Setup 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Zero 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Accuracy 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Locations 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Zero 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Range 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing TEKPROBE Interface Pins 4–11. . . . . . . . . . . . . . . . . . .
Removing and Replacing the Compensation Box Covers 4–12. . . . .
Removing and Replacing the TEKPROBE Interface Collar 4–14. . .
Inspection and Cleaning 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Parts 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Shipment 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts
Replaceable Parts 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 5–2. . . . . . . . . . . . . . . . . . . . . . . .
Item Names 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indentation System 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abbreviations 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
P6245AD Instruction Manual
List of Figures
Figure 1–1: Dynamic and Offset Limitations 1–8. . . . . . . . . . . .
Figure 1–2: Probe Functional Check Connections 1–9. . . . . . . .
Figure 2–1: Waveform Distortion
from Ground Lead Length 2–2. . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Ground Lead Equivalent Cir cuit 2–3. . . . . . . . . . . .
Figure 2–3: Low-inductance Grounding 2–5. . . . . . . . . . . . . . . .
Figure 2–4: Using a SureFoot Adapter for Gr ounding 2–6. . . .
Figure 2–5: Using a Probe T ip as a Test Point 2–7. . . . . . . . . . .
Table of Contents
Figure 2–6: Probe T ip Stabilizing Notch 2–8. . . . . . . . . . . . . . . .
Figure 3–1: Typical Voltage Derating vs. Frequency 3–3. . . . . .
Figure 3–2: Typical Linearity Error vs V
Figure 3–3: Typical Input Impedance vs. Frequency 3–4. . . . . .
Figure 4–1: P6245AD Simplified Schematic Diagram 4–1. . . . .
Figure 4–2: TEKPROBE Interface 4–3. . . . . . . . . . . . . . . . . . . .
Figure 4–3: P6245AD DC Accuracy Setup 4–6. . . . . . . . . . . . . .
Figure 4–4: P6245AD Adjustment Locations 4–8. . . . . . . . . . . .
Figure 4–5: Replacing TEKPROBE Interface Pins 4–11. . . . . . .
Figure 4–6: Removing the Compensation Box Covers 4–12. . . . .
Figure 4–7: Replacing the Compensation Box Cover 4–13. . . . .
Figure 4–8: Replacing the TEKPROBE collar 4–14. . . . . . . . . . .
Figure 4–9: Compensation Box Test Point Locations 4–17. . . . . .
IN
3–3. . . . . . . . . . . . .
Figure 5–1: P6245AD Replaceable Parts 5–4. . . . . . . . . . . . . . . .
Figure 5–2: P6245AD Standard Accessories 5–6. . . . . . . . . . . . .
Figure 5–3: P6245AD Optional Accessories 5–8. . . . . . . . . . . . .
P6245AD Instruction Manual
iii
Table of Contents
iv
P6245AD 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. 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.
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.
Do Not Operate Without Covers. Do not operate this product with
covers or panels removed.
Avoid Exposed Circuitry. Do not touch exposed connections and
components when power is present.
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.
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.
P6245AD Instruction Manual
v
General Safety Summary
CAUTION. Caution statements identify conditions or practices that
could result in damage to this product or other property .
vi
P6245AD Instruction Manual
Preface
This manual is divided into user information and servicing
information. These sections are described below.
User Information
This section contains the information necessary to install and use the
P6245AD.
H Getting Started
This section contains the product description, description of
accessories, probe setup configuration, and how to check the
probe for normal operation.
H Operating Basics
This section contains basic information and operating suggestions
for optimal probe performance
H Specifications
This sections list the specifiecations for this product.
Service Information
This section contains the information necessary to maintain and
service the P6245AD.
H Theory of Operation
H Performance Verification
H Adjustments
H Maintenance
H Troubleshooting
Replaceable Parts
This section lists the replaceable parts, stadard accessories, and
optional accessories that are available for this product.
P6245AD Instruction Manual
vii
Preface
Contacting Tektronix
Product
support
Service
support
Toll–free
Number
For questions about using Tektronix measurement
products, call toll free in North America:
1-800-833-9200
6:00 a.m. – 5:00 p.m. Pacific time
Or contact us by e-mail:
tm_app_supp@tek.com
For product support outside of North America,
contact your local Tektronix distributor or sales
office.
Tektronix offers a range of services, including
Extended Warranty Repair and Calibration services.
Contact your local Tektronix distributor or sales
office for details.
For a listing of worldwide service centers, visit our
web site.
In North America:
1-800-833-9200
An operator can direct your call.
viii
Postal
Address
Web site
Tektronix, Inc.
Department or name (if known)
P.O. Box 500
Beaverton, OR 97077
USA
www.tektronix.com
P6245AD Instruction Manual
Getting Started
Product Description
The Tektronix P6245AD is a 10X active FET probe with less than
1 pF input capacitance. The low input capacitance and high input
resistance minimize circuit loading over a wide bandwidth range.
The small profile and low-mass head of the P6245AD makes probing
crowded circuits by hand fast and easy. The accessory tips and
adapters enable the P6245AD to be used on a wide variety of circuit
architectures.
The P6245AD is powered through a TEKPROBE interface between
the compensation box of the probe and the oscilloscope. The
P6245AD may be used with nonTEKPROBE oscilloscopes and
instruments by using the optional Tektronix 1 103 Probe Power
Supply.
In order to fully appreciate the probe’s capabilities, please read the
Getting Started and Operating Basics sections of this manual.
Standard Accessories
The P6245AD is shipped with the following standard accessories:
H standard probe tips
H SureFoot adapter probe tips
H SMT KlipChip microcircuit test leads
H Y-lead adapter
H right-angle adapter
H signal-ground adapters
H three- and six-inch ground leads
H low-inductance ground lead
H marker rings
H Instruction Manual
P6245AD Instruction Manual
1–1
Getting Started
For service information, refer to the service section beginning at the
yellow page.
For part number information for standard and optional accessories,
refer to the Replaceable Parts section of this manual.
1–2
P6245AD Instruction Manual
Features and Accessories
The P6245AD is provided with several features and accessories
designed to make probing and measurement a simpler task. Please
take a moment to 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
areas.
Probe Tip
Socket
Ground
Socket
Stabilization
Notch
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. See pages 1–6 and 2–8 for more
information.
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 4–2 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
2–7 for more information.
The push-in probe tip may also be used with the
other socketed leads and adapters.
P6245AD Instruction Manual
1–3
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 the SureFoot adapters the
same way as the push-in probe tips. They can be
used with any of the socketed accessory leads.
Right Angle
Adapter
The yellow, 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.
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 P6245AD 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.
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.
1–4
P6245AD Instruction Manual
Y-lead
Adapter
Features and Accessories
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 2–2 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.
3- and 6-inch ground leads. Use the three- and
six-inch ground leads for general probing. The
socketed end of the leads may be connected to
any of the probe tips and adapters, or fitted onto
0.025 inch pins.
To attach the ground leads, 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 2–2 for more information.
Low-inductance ground lead. Use the
low-inductance ground adapter to substantially
reduce ground lead inductance. Because the
ground lead simply touches the ground reference,
you can easily move the probe to different points
on the device under test.
To attach, press the ground lead into the probe
head gound socket.
P6245AD Instruction Manual
When selecting the grounding connection,
maintain as short a ground path as possible.
Refer to page 2–2 for more information.
1–5
Features and Accessories
Signal Ground
Adapter
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. See page 2–8 for further details.
FlexLead
Adapter
KlipChip
Y-lead
Adapter
Color Marker
Bands
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- or six-inch ground leads. Simply press
the lead socket into the KlipChip handle.
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.
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.
1–6
P6245AD Instruction Manual
Configuration
The P6245AD provides the oscilloscope with the probe model
number, serial number, and attenuation factor. When connected to a
TEKPROBE oscilloscope, 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 P6245AD on a
nonTEKPROBE 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 P6245AD 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, the
offset controls on the optional Tektronix 1103 Probe Power Supply
can be used.
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 1–1 on page 1–8.
NOTE. See your oscilloscope manual for specific instructions on its
operation and offset control.
P6245AD Instruction Manual
1–7
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 P6245AD has a ±10 V offset range. The linear operating
range is ±8 V. See Figure 1–1. Also, see page 2–1 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 (+40 V Maximum Non-destructive Input Voltage )
+18 V
+10 V
+8 V
0 V
–8 V
–10 V
–18 V
Nonoperating Range (–40 V Maximum Non-destructive Input Voltage )
+10 V
Maximum Offset RangeMaximum AC Signal Amplitude
–10 V
Figure 1–1: Dynamic and Offset Limitations
1–8
P6245AD 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. See Figure 1–2.
Figure 1–2: Probe Functional Check Connections
1. Connect the probe to the oscilloscope.
2. Set the oscilloscope to display the probe’s channel.
3. Using a ground lead and a SMT KlipChip, connect the probe
ground to the PROBE COMPENSATION ground connection on
the oscilloscope.
4. Using a standard tip, hold the probe to the SIGNAL terminal on
the oscilloscope.
5. Press AUTOSET (or adjust the oscilloscope) to display the
calibration waveform.
P6245AD Instruction Manual
1–9
Functional Check
NOTE. If your instrument supports probe calibration routines, now is
a good time to perform them.
6. Disconnect the probe from the SIGNAL terminal and ground the
probe tip. (Connect the KlipChip to the probe tip.)
7. With the probe offset set to 0.0 V, the oscilloscope display should
be at the ground reference.
8. Set the oscilloscope volts/division to 5 V.
9. Adjust the probe offset. The displayed waveform should vary
between approximately +10 V and –10 V. (A +10 V offset
displays a –10 V level on your instrument.)
NOTE. If no waveform is displayed, check the vertical coupling to be
sure that it is set to DC.
If the offset adjustment has no effect, set the vertical coupling to DC.
If you are using the Tektronix 1103 Probe Power Supply, and the
waveform is distorted, check to make sure that the oscilloscope
termination is 50 W.
If the probe does not pass this functional check, go to the Troubleshooting section of this manual.
1–10
P6245AD Instruction Manual
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