Tektronix P6021 Service
Instruction Manual
P6021
60 MHz Current Probe
070-0947-07
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. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or
suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered tradem arks of Tektronix, Inc.
POSIDRIV is a registered trademark of the Philips Screw Co.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
H In North America, call 1-800-833-9200.
H Worldwide, visit www.tektronix.com to find contacts in your area.
Warranty 2
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1)
year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its
option, either will repair the defective product without charge for parts and labor, or will provide a re placement in
exchange for the defective product. Parts, modules and replacement products used by Tektronix for warranty work
may be new or reconditioned to like new performance. All repla ced parts, modules and products become the
property of Tektronix.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix, with
shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been
modified or integrated with other products when the effect of such modi fication or i ntegration increases the time
or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
General Safety Summary iii...................................
Service Safety Summary v....................................
Environmental Considerations vii...............................
Operator Information 1......................................
Description 1.....................................................
Installation 1.....................................................
Operating Considerations 3..........................................
Service Information 7........................................
Warranted Characteristics 7..........................................
Typical Characteristics 9............................................
Circuit Description 11...............................................
Probe Performance 12...............................................
Performance Verification 14..........................................
P6021 Test Record 19...............................................
Adjustment Procedure 20............................................
Maintenance 23....................................................
Replaceable Electrical Parts 27.................................
Parts Ordering Information 27.........................................
Using the Replaceable Electrical Parts List 27............................
Replaceable Mechanical Parts 31...............................
Parts Ordering Information 31.........................................
Using the Replaceable Mechanical Parts List 31..........................
Index 35....................................................
P6021 Instruction Manual
i
Table of Contents
List of Figures
Figure 1: The P6021 Probe and termination 2....................
Figure 2: Insertion Impedance of the P6021 5....................
Figure 3: Probe and termination input current vs. frequency
derating 8..............................................
Figure 4: Typical P6021 phase response 10.......................
Figure 5: Midband accuracy test setup 14........................
Figure 6: High frequency bandwidth test setup 17.................
Figure 7: Connecting the probe to the calibration fixture 21.........
Figure 8: Location of probe adjustments 22......................
Figure 9: Location of termination adjustments 22.................
Figure 10: Disassembling the probe 24...........................
Figure 11: P6021 probe component location 30....................
Figure 12: P6021 termination component location 30...............
Figure 13: P6021 exploded view 34..............................
List of Tables
T able 1: Warranted electrical characteristics 7...................
T able 2: Warranted environmental characteristics 7..............
Table 3: Maximum ratings 8..................................
T able 4: Electrical characteristics 9............................
T able 5: Mechanical characteristics 9..........................
Table 6: Equipment list 13....................................
Table 7: Low frequency bandwidth measurements 16..............
Table 8: High frequency bandwidth measurements 18.............
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P6021 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.
ToAvoidFireor
Personal Injury
Connect and Disconnect Properly. De-energize the circuit under test before
connecting or disconnecting the current probe.
Connect and Disconnect Properly. Connect the probe output to the measurement
instrument before connecting the probe to the circuit under test. Connect the
probe reference lead to the circuit under test before connecting the probe input.
Disconnect the probe input and the probe reference lead from the circuit under
test before disconnecting the probe from the measurement instrument.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Connect the probe reference lead to earth ground only.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do not connect a current probe to any wire that carries voltages above the current
probe voltage rating.
P6021 Instruction Manual
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.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
iii
General Safety Summary
Terms in this Manual
Symbols and Terms
on the Product
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.
These terms may appear on the product:
H DANGER indicates an injury hazard immediately accessible as you read the
marking.
H WARNING indicates an injury hazard not immediately accessible as you
read the marking.
H CAUTION indicates a hazard to property including the product.
The following symbol(s) may appear on the product:
CAUTION
Refer to Manual
Earth Terminal
Do not connect to or
remove from an
uninsulated conductor that
is HAZARDOUS LIVE.
Breakable.
Do not drop.
Use only on an
insulated wire.
iv
P6021 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.
To avoid electric shock, do not touch exposed connections.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
P6021 Instruction Manual
v
Service Safety Summary
vi
P6021 Instruction Manual
Environmental Considerations
This section provides information about the environmental impact of the
product.
Product End-of-Life
Handling
Restriction of Hazardous
Substances
Observe the following guidelines when recycling an instrument or component:
Equipment Recycling. Production of this equipment required the extraction and
use of natural resources. The equipment may contain substances that could be
harmful to the environment or human health if improperly handled at the
product’s end of life. In order to avoid release of such substances into the
environment and to reduce the use of natural resources, we encourage you to
recycle this product in an appropriate system that will ensure that most of the
materials are reused or recycled appropriately.
The symbol shown to the left indicates that this product
complies with the European Union’s requirements
according to Directive 2002/96/EC on waste electrical and
electronic equipment (WEEE). For information about
recycling options, check the Support/Service section of the
Tektronix Web site (www.tektronix.com).
This product has been classified as Monitoring and Control equipment, and is
outside the scope of the 2002/95/EC RoHS Directive.
P6021 Instruction Manual
vii
Environmental Considerations
viii
P6021 Instruction Manual
Operator Information
Thank you for choosing a Tektronix current probe. This manual describes the
P6021 current probe with passive termination and provides information about
making measurements with the probe.
Description
The P6021 current probe converts an alternating current waveform to a voltage
that can be displayed and measured on an oscilloscope display. The probe
provides accurate current measurements over a wide range of frequencies and
allows you to measure current without breaking the circuit.
The P6021 probe is compatible with general purpose oscilloscopes having a
1MΩ input impedance. The P6021 probe comes with a passive termination that
matches oscilloscope and probe impedance, optimizes the probe performance,
and provides two sensitivity settings.
The P6021 probe comes with a 5-foot cable and termination.
Installation
This section describes both attaching the probe to an oscilloscope and using the
standard accessories with the probe.
To ensure the best performance from your probe and oscilloscope measurement
system, check that the probe and oscilloscope are appropriately matched. The
oscilloscope inputs should use BNC connectors and have an impedance of
1MΩ.
Figure 1 shows the probe and various parts referred to in this manual.
P6021 Instruction Manual
1
Operator Information
P6021 Probe
Termination
6” Ground Lead
Figure 1: The P6021 Probe and termination
Attaching the Probe and
Termination to an
Oscilloscope
Attach the probe to the termination as shown in Figure 1.
An alligator-style ground clip is supplied to improve EMI rejection at high
frequencies (2 MHz and above). Snap the ground lead to the probe transformer
post and attach the alligator clip directly to RF ground. This will reduce ringing
and help bypass capacitively-coupled RF currents that can flow into the probe
cable.
WARNING. To avoid injury or damage to the equipment, do not disconnect the
probe termination and leave the P6021 clamped around the conductor when you
measure high currents. If you leave the probe cable unterminated, you can cause
a high voltage to develop in the secondary winding, which may damage the
current probe transformer.
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P6021 Instruction Manual
Operator Information
Using the Standard
Accessories
Optional Accessories
Your P6021 is shipped with the following accessories:
H This instruction manual — Read these instructions to familiarize yourself
with the features, specifications, and operation of the P6021 current probe.
H 6-inch ground lead — Use the 6-inch ground lead to ground the shield
around the probe transformer at the probe end of the cable. This allows you
to move the ground connection closer to the circuit that you are measuring,
thereby improving high frequency response. The ground lead clips onto the
ground connector on the bottom of the probe as shown.
Please refer to the parts list in the section entitled Replaceable Mechanical Parts
for part numbers.
Your P6021 may be used with the following optional accessory:
H CT-4 Current Probe — The CT-4 is a robust clip-on transformer that
extends the current range of the P6021 up to 1000 amps (provided the
amp-second rating is not exceeded). The CT-4 has receptacles for current
probes in either 20:1 or 1000:1 step-down ratios.
Operating Considerations
The information in this section will help you make effective use of your P6021
probe.
Features and Controls
Sensitivity
control
H Sensitivity Control — The P6021 termination has a control that allows you
to select probe sensitivity. The switch has two positions: 2 mA/mV and
10 mA/mV. When the control is in the 2 mA/mV position, the oscilloscope
displays 1 mV for every 2 mA of current in the circuit under test. When the
control is in the 10 mA/mV position, the oscilloscope displays 1 mV for
every 10 mA of current in the circuit under test.
You can set vertical scale on the oscilloscope to any scale factor, as
determined by the signal amplitude. To calculate the overall vertical scale
factor for the oscilloscope, probe, and termination, multiply the termination
sensitivity control setting by the vertical scale factor of the oscilloscope. For
example, if the termination control is set to the 10 mA/mV position and the
oscilloscope to a vertical scale of 20 mV/division, the overall scale factor is
10 X 20, or 200 mA/division.
P6021 Instruction Manual
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