Tektronix P6135A Instruction Manual
Instruction Manual
P6135A
Differential Probe Pair
070-7675-02
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.
T ektronix 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.
T ektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
KLIPCHIP is a trademark of T ektronix, 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 purchase from
an authorized Tektronix distributor. 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. Batteries are excluded from this warranty.
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, shipping charges prepaid,
and with a copy of customer proof of purchase. 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 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. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting T ektronix viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Features 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grounding the Probe 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Choosing the Correct Probe Tip 1–6. . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics
Probe Calibration 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMRR Considerations 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Balancing Probe Pair Impedance Differences 2–2. . . . . . . . . . . . . .
Dynamic Range Effects 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Grounding 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Performance V erification and
Calibration Procedures
T est Equipment 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single-ended Applications 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check and Adjust DC Attenuation 4–3. . . . . . . . . . . . . . . . . . .
Check and adjust low-frequency (LF) compensation 4–6. . . . .
Check and adjust high-frequency (HF) compensation 4–8. . . . .
Check bandwidth and system rise time 4–9. . . . . . . . . . . . . . . .
Common Mode Applications 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . .
Check and Adjust DC Attenuation 4–12. . . . . . . . . . . . . . . . . . .
Check and Adjust LF and HF Compensation 4–14. . . . . . . . . . .
System Calibration and Time Delay Error Compensation
(11A33 only) 4–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P6135A Instruction Manual
i
T able of Contents
Maintenance
Preventive Maintenance 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Visual Inspection 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Tip Replacement 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Readjustment After Repair 5–3. . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Repackaging for Shipment 5–3. . . . . . . . . . . . . . . . . . .
Replaceable Parts
Parts Ordering Information 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Servicing 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 6–2. . . . . . . . . . . . . . . . . . . . . . . .
Abbreviations 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mfr. Code to Manufacturer Cross Index 6–3. . . . . . . . . . . . . . .
ii
P6135A Instruction Manual
List of Figures
Figure 1–1: P6135A differential probe pair with accessories 1–2
Figure 1–2: Probe finger guard and hand contact area 1–6. . . .
Figure 2–1: Optimizing low-frequency CMRR
performance 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Optimizing high-frequency CMRR
performance 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: A series resonant circuit 2–5. . . . . . . . . . . . . . . . . . .
Figure 2–4: Effects of ground-lead inductance 2–5. . . . . . . . . . .
Figure 3–1: Typical input impedance 3–2. . . . . . . . . . . . . . . . . . .
Figure 3–2: Typical voltage derating vs. frequency 3–3. . . . . . .
Figure 3–3: Typical CMRR vs frequency with 1 1A33
oscilloscope 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–4: Typical CMRR vs frequency with 7A13
oscilloscope 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able of Contents
Figure 4–1: Setup for adjustment of DC attenuation 4–12. . . . . .
Figure 4–2: Typical CMRR display after calibration 4–18. . . . . .
Figure 5–1: P6135A probe tip assembly 5–2. . . . . . . . . . . . . . . .
Figure 6–1: P6135A probe with standard accessories 6–4. . . . .
Figure 6–2: P6135A probe optional accessories 6–7. . . . . . . . . .
P6135A Instruction Manual
iii
T able of Contents
List of Tables
Table 3–1: Electrical characteristics 3–1. . . . . . . . . . . . . . . . . . .
Table 3–2: Environmental characteristics 3–4. . . . . . . . . . . . . .
Table 3–3: Physical characteristics 3–5. . . . . . . . . . . . . . . . . . . .
Table 3–4: Certifications and compliances 3–5. . . . . . . . . . . . . .
Table 4–1: Test equipment 4–2. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–2: Verification points for CMRR (with
11A33 and 7A13) 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
P6135A 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. T o 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.
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 apply a potential to any terminal, including the common
terminal, that exceeds the maximum rating of that terminal.
Connect the ground lead of the probe to earth ground only.
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.
Keep Product Surfaces Clean and Dry.
P6135A Instruction Manual
v
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 .
vi
P6135A Instruction Manual
Preface
This manual contains information on how to use and maintain the
P6135A differential probe pair.
The manual is organized into the following sections:
H Getting Started provides a product overview and introduction to
H Operating Basics discusses techniques for improving measure-
H Specifications lists the probe warranted characteristics.
H Performance Verification and Calibration contains procedures to
H Maintenance contains inspection and cleaning procedures and
H Replaceable Parts lists standard and optional probe parts and
probe features and accessories.
ment accuracy.
verify performance and to calibrate the probe.
instructions for replacing probe tips.
accessories and provides ordering information.
P6135A Instruction Manual
vii
Preface
Contacting Tektronix
Product
support
Service
support
For other
information
To write us
Web site
For questions about using T ektronix 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:
support@tek.com
For product support outside of North America,
contact your local T ektronix distributor or sales
office.
T ektronix offers extended warranty and calibration
programs as options on many products. Contact
your local T ektronix distributor or sales office.
For a listing of worldwide service centers, visit our
web site.
In North America:
1-800–833–9200
An operator can direct your call.
T ektronix, Inc.
P.O. Box 500
Beaverton, OR 97077-1000
USA
www .Tektronix.com
viii
P6135A Instruction Manual
Getting Started Getting Started
Getting Started
The Tektronix P6135A probe is a 10X passive differential probe pair
specifically designed for use with T ektronix differential plug-in
units.
Product Description
Three sets of probe tips included with the package allow the probe
pair to be used with plug-in units or oscilloscopes having input
impedances of 1 MW at 13 to 17 pF (red tips), 1 MW at 18 to 22 pF
(black tips), or 1 MW at 45 to 49 pF (blue tips). The attenuation ratio
is adjustable to 10X, including the affect of amplifier input
impedance.
The probes need not be used as a pair. When used individually, each
will provide highly accurate signal transmission to any compatible
oscilloscope input.
When the P6135A probe pair is used on a differential amplifier, the
adjustable attenuation ratio compensates for differences in amplifier
input resistance, thus improving the common-mode rejection ratio
(CMRR) of the system.
The built-in compensation box adjusts for uniform frequency
response characteristics, providing a high CMRR from DC to high
frequencies, as well as adjustments to optimize transient response.
The special low-noise coaxial cable used on the P6135A helps to
maintain high system CMRR, even when a probe is moved. Each
probe has a 1.5 meter probe cable.
The P6135A probe pair meets the requirements of UL 1244 and is
fully compatible with the T ektronix family of compact probe
accessories.
P6135A Instruction Manual
1–1
Getting Started
Tip cover
Retractable
hook tip
Ground lead
with socket
Probe tip
ID Button
Low-inductance ground
lead and collar
Ground lead with
alligator clip
SMT KlipChip
TM
Color marker band
BNC shell, locking ring
Compensation box
Figure 1–1: P6135A Differential Probe Pair with accessories
Standard Accessories
Standard accessories for the P6135A probe pair are listed below .
2 Retractable hook tips
2 Low-inductance ground lead and collars
2 Ground lead with sockets
2 Ground lead with alligator clips
1 Double ground lead
2 SMT KlipChips
1 Adjustment tool
1 Pkg., color marker bands
1 Cable clip
2 Tip holders
1 Accessory pouch
1 Instruction manual
Cable clip
1–2
Chapter six contains ordering information for all standard and
optional accessories.
P6135A Instruction Manual
Probe Features
The following table discusses P6135A probe pair components,
connectors, and standard accessories. Refer to Figure 1–1 to identify
items within the probe pair.
Getting Started
BNC Shell, Locking Ring. Locks the probe onto the instrument.
To install, fully rotate the locking ring counter-clockwise as viewed
from the cable end of the compensation box. Insert the probe
onto the front-panel connector and rotate the locking ring
clockwise until the probe is secured to the instrument.
Compensation Box. Contains an adjustable network with four
adjustment points that can be reached using the adjustment tool.
These adjustments allow you to compensate the probe for
uniform frequency-response characteristics, providing a high
CMRR from DC to high frequencies.
Cable Clip. Holds the probe cable in consistent relationship with
each other. By minimizing movement and interaction, CMRR is
optimized.
Color Marker Bands. Identifies specific probes when using
multi-channel oscilloscopes. Markers are provided in various
different colors.
Double Ground Lead. Provides a ground connection between
the two probes.
Ground Lead with Alligator Clip. Makes connections to ground
pins.
P6135A Instruction Manual
1–3
Getting Started
Ground Lead with Socket. Connects to the SMT KlipChip or
directly onto the square-pin ground of a circuit board.
ID Button. Activates the ID function in the host instrument.
Pressing the ID button also executes a programmed test routine
on some oscilloscopes.
Low-Inductance Ground Lead and Collar. Provides
low-inductance ground connections to ensure maximum
performance.
Probe Tip. Acquires the signal from the circuit under test. The
P6135A probe pair comes standard with two tip holders for
storage and three pairs of color-coded attenuator tips.
Red: for oscilloscopes with 13 to 17 pF inputs.
Black: for oscilloscopes with 18 to 22 pF inputs.
Blue: for oscilloscopes with 45 to 49 pF inputs.
Retractable Hook Tip. Provides a means of making a hands-free
connection to a test point or component lead. To install, slide onto
the probe tip.
1–4
NOTE: Retractable hook tips cannot be used with the
low-inductance ground lead.
SMT KlipChip. Plugs into the ground leads to form connections
in tight places.
TEKPROBE Interface (Level 1). Provides communication with a
similarly equipped host instrument (through the input connector)
for signal, attenuation readout factor, and function triggering.
Your oscilloscope may not implement all features of the
TEKPROBE interface. Check your oscilloscope manual for
details.
Adjustment Tool. Use this tool to make compensation box
adjustments.
P6135A Instruction Manual
Grounding the Probe
Connect the probe to the instrument and connect the ground lead to
ground before making any measurements. Ensure that no part of the
ground lead contacts voltage in the circuit under test. Except for the
probe tip and BNC center conductor, all accessible metal (including
the ground clip) is connected to the BNC shell.
WARNING. To avoid electric shock when using the pr obe, keep your
fingers behind the finger guard on the pr obe body. See Figure 1–2
below.
Hand contact area
Getting Started
Finger
guard
Figure 1–2: Probe finger guard and hand contact area
P6135A Instruction Manual
1–5
Getting Started
Choosing the Correct Probe Tip
The P6135A probe pair comes with three sets of matched probe tips.
Each probe is shipped with the red tip installed.
Choose the correct set of tips for your instrument:
H Use the red tips for 11000 Series oscilloscopes that have 15 pF
inputs.
H Use the black tips for 7000 Series oscilloscopes that have 20 pF
inputs.
H Use the blue tips for 5000 Series and some 7000 Series
oscilloscopes that have 47 pF inputs.
For instructions on how to change or replace a probe tip, refer to
Probe Tip Replacement on page 5–2.
1–6
P6135A Instruction Manual
Operating Basics Operating Basics
Operating Basics
This section discusses technical issues you should consider when
using the P6135A probe pair.
Probe Calibration
Accurate differential measurements require careful matching of both
channels of the differential measurement system. In calibrating a
probe pair to obtain optimum common-mode rejection ratio
(CMRR), the adjustments compensate for imbalances in the
differential amplifier and between the probes themselves.
NOTE. Probes will meet specification only when calibrated to the
inputs on which they are used. If the probes are interchanged on the
differential amplifier inputs or moved to another instrument, they
must be recalibrated (this also applies when using the probes in
nondifferential mode).
Probe calibration is not difficult but must be accurately performed to
achieve high CMRR characteristics. Refer to the Performance
Verification & Calibration Procedures beginning on page 4–1 for
calibration procedures.
CMRR Considerations
Common-mode signals are signals or parts of signals that are
identical in amplitude, frequency, and phase. A differential amplifier
rejects common-mode signals and amplifies the difference. The
degree of rejection depends primarily on the symmetry of the
amplifier and signal path. CMRR refers to the degree of rejection of
common-mode signals and is expressed as a ratio. For instance, if
10 V of input common-mode signal resulted in 1 mV at the output,
the CMRR would be 10,000:1.
P6135A Instruction Manual
2–1
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