Instructions
A6302 & A6302XL
20 Ampere AC/DC Current Probes
070-3905-05
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 and TEK are registered tradem arks 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 replaceme nt 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 performanc e 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 representative s to install, re pair 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 W ARRANTY 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.
Service Assurance
If you have not already purchased Service Assurance for this product, you may do so at any time during the product’s
warranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs.
Repair Protection extends priority repair services beyond the product’s warranty period; you may purchase up to three
years of Repair Protection.
Calibration Services provide annual calibration of your product, standards compliance and required audit docum entation,
recall assurance, and reminder notification of scheduled calibration. Coverage begins upon registration; you may purchase
up to five years of Calibration Services.
Service Assurance Advantages
H Priced well below the cost of a single repair or calibration
H Avoid delays for service by eliminating the need for separate purchase authorizations from your company
H Eliminates unexpected service expenses
For Information and Ordering
For more information or to order Service Assurance, contact your Tektronix representative and provide the information
below. Service Assurance may not be available in locations outside the United States of America.
Name VISA or Master Card number and expiration
Company date or purchase order number
Address Repair Protection (1,2, or 3 years)
City, State, Postal code Calibration Services (1,2,3,4, or 5 years)
Country Instrument model and serial number
Phone Instrument purchase date
Table of Contents
Service Assurance 4.........................................
General Safety Summary iii..........................................
Preface v...................................................
Contacting Tektronix vi.............................................
Getting Started 1............................................
Product Description 1..............................................
Probe Installation 2................................................
Operating the Current Probe Slide 3...................................
Degaussing and Autobalancing the Current Probe 4......................
Probe Trim Adjust for Gain Accuracy (AM503B and AM5030 Only) 4.......
Maximum Current Limits 5..........................................
Specifications 8.............................................
Performance V erification 13...................................
Test Procedure Conditions 13.........................................
Equipment Preparation 13............................................
Required Test Equipment 14..........................................
Bandwidth 16......................................................
Rise Time 18......................................................
DC Gain Accuracy 21...............................................
Probe Trim Adjust for Gain Accuracy (AM503B and AM5030 Only) 24.......
DC Offset Adjustment 27......................................
Required Test Equipment 27..........................................
Equipment Connections 28...........................................
AM503B or AM5030 28.............................................
AM503A 30.......................................................
AM503 32........................................................
Maintenance 33..............................................
Cleaning 33.......................................................
Disassembly Instructions 33..........................................
Obtaining Replacement Parts 38.......................................
Preparation for Shipment 38..........................................
Replaceable Parts 39..........................................
Parts Ordering Information 39.........................................
Using the Replaceable Mechanical Parts List 39..........................
A6302 and A6302XL Instructions
i
Table of Contents
List of Figures
Figure 1: Connecting a current probe to the current probe amplifier 2
Figure 2: Operating the probe slide 3...........................
Figure 3: Applying the amp-second product rule 6................
Figure 4: A6302 and A6302XL specified operating area 9..........
Figure 5: A6302 and A6302XL frequency derating curve for
maximum input current 9................................
Figure 6: A6302 and A6302XL insertion impedance curve 10........
Figure 7: A6302 Probe jaw dimensions (nominal) 10...............
Figure 8: Bandwidth test setup for the A6302 and A6302XL
current probes 16.........................................
Figure 9: Rise time test setup for A6302 and A6302XL current
probes 19................................................
Figure 10: DC gain accuracy test setup for A6302 and A6302XL
current probes 22.........................................
Figure 11: A6302 and A6302XL current probes DC offset
adjustment location 27.....................................
Figure 12: Removing the strain relief boot 34.....................
Figure 13: Removing the top half of the probe 35..................
Figure 14: Removing the probe slide 35..........................
Figure 15: Removing the current transformer and cable assembly
of the A6302 probe 36.....................................
Figure 16: Removing the current transformer of the A6302XL
probe 37.................................................
Figure 17: A6302 exploded view 42..............................
Figure 18: A6302XL exploded view 44...........................
List of Tables
ii
Table 1: Warranted A6302 and A6302XL specifications 8.........
T able 2: Electrical characteristics 8............................
T able 3: Mechanical characteristics 10..........................
Table 4: Environmental characteristics 11.......................
Table 5: Certifications and compliances 11.......................
A6302 and A6302XL Instructions
Table of Contents
Table 6: Required test equipment 14............................
Table 7: Equipment settings for bandwidth 16....................
Table 8: Equipment settings for rise time 19.....................
T able 9: Equipment settings for DC gain accuracy 22..............
Table 10: DC gain accuracy test for A6302 and A6302XL
current probes 23.........................................
Table 11: DC gain accuracy test work sheet for A6302 and
A6302XL current probes 25................................
Table 12: Required test equipment 27...........................
Table 13: AM503B/AM5030 settings for DC offset adjustment 28....
Table 14: AM503B/AM5030 error codes requiring DC
offset adjustment 29......................................
Table 15: AM503A settings for DC offset adjustment 30............
Table 16: AM503A error codes requiring DC offset adjustment 31...
Table 17: AM503 settings for DC offset adjustment 32.............
A6302 and A6302XL Instructions
iii
Table of Contents
iv
A6302 and A6302XL Instructions
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
Only qualified personnel should perform service procedures.
Injury Precautions
Product Damage
Precautions
Avoid Electric Overload. To avoid electric shock or fire hazard, do not apply a
voltage to a terminal that is outside the range specified for that terminal.
Avoid Electric Shock. To avoid injury or loss of life, do not connect or disconnect
probes or test leads while they are connected to a voltage source.
Ground the Product. This product is indirectly grounded through the grounding
conductor of the mainframe 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.
Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not operate
this product in wet or damp conditions.
Do Not Operate in an Explosive Atmosphere. To avoid injury or fire hazard, do not
operate this product in an explosive atmosphere.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Immerse in Liquids. Clean the probe using only a damp cloth. Refer to
cleaning instructions.
A6302 and A6302XL Instructions
v
General Safety Summary
Symbols and Terms
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. The following symbols may appear on the product:
Certifications and
Compliances
CAUTION
Refer to Manual
Breakable.
Do not drop.
WARNING
High Voltage
Use only on an
insulated wire.
Double
Insulated
Protective Ground
(Earth) Terminal
Do not connect to or
remove from an
uninsulated conductor that
is HAZARDOUS LIVE.
Refer to the specifications section for a listing of certifications and compliances
that apply to this product.
vi
A6302 and A6302XL Instructions
Preface
This instruction manual supports the operation and maintenance of the A6302
and A6302XL current probes with any of the AM503 series current probe
amplifiers.
You can find additional documentation supporting the operation and maintenance
of the AM503 series amplifiers in the following manuals:
H AM503 Instruction Manual (070-2052-XX)
H AM503S (AM503A) User Manual (070-8170-XX)
H AM503S (AM503A) Service Manual (070-8174-XX)
H AM503B & AM5030 Instruction Manual (070-8766-XX)
A6302 and A6302XL Instructions
vii
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 support 1-800-833-9200, select option 1*
Service support 1-800-833-9200, select option 2*
Technical support Email: techsupport@tektronix.com
1-800-833-9200, select option 3*
6:00 a.m. -- 5:00 p.m. Pacific time
* This phone number is toll free in North America. After office hours, pl ease 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.
viii
A6302 and A6302XL Instructions
Getting Started
Product Description
This section explains how to install and operate the A6302 and A6302XL current
probes.
The A6302 is a DC to 50 MHz current probe designed for use with the AM 503
family of current probe amplifiers and with the 11A16 plug-in. With the AM 503
family, the A6302 can measure currents to 20 A (DC + peak AC), and up to 50 A
peak current (while not exceeding the amp-second rating). With the 11A16
plug-in, the A6302 can measure currents to 10.5 A.
The A6302XL is an extended length cable version of the A6302. It offers the
same current range as the A6302 with a diminished frequency range of DC to
17 MHz. The A6302XL can only be used with the AM 503B and AM 5030, and
will not be recognized by other current probe amplifiers.
The probe performance specifications, verification, and adjustment are unique to
the amplifier that the probe is plugged into. Please refer to the amplifier
documentation for specifications and verification procedures.
A6302 and A6302XL Instructions
1
Getting Started
Probe Installation
Amplifier
To connect the current probe to the amplifier input connector, align the tab of the
probe connector with the slot in the amplifier input connector as shown in
Figure 1(a). Align the dot on the probe connector with the groove opening of the
input connector as shown in Figure 1(b). Push the probe connector in while
twisting the barrel clockwise to lock the connector.
CAUTION. Handle the current probe with care. Do not drop the probe or subject
it to impact, or the core may crack. Do not connect or disconnect the current
probe while the probe is clamped around a live conductor or while the amplifier
is powered on, or the probe may suffer electrical damage.
Current probe connector
Tab
Slot
(a) Align the tab with the connector slot
Amplifier
Figure 1: Connecting a current probe to the current probe amplifier
Push connector in
and twist to lock
Current probe
connector
Groove
(b) Insert the connector into the amplifier
Alignment dot
2
A6302 and A6302XL Instructions
Operating the Current Probe Slide
The current probe has a slide mechanism that opens and closes the probe jaw.
This allows you to clamp the probe around a conductor under test. The slide
must be locked to accurately measure current or to degauss the probe. If a probe
is unlocked, the PROBE OPEN indicator on the amplifier lights.
WARNING. When the probe slides are open, the exposed ferrite core pieces are
not insulated. To avoid injury or equipment damage, remove power from an
uninsulated wire before clamping the current probe around it. Also, never
disconnect the probe from the amplifier when the probe is connected to a live
conductor.
Figure 2 illustrates the slide operation of the probe. To open the probe, pull the
slide back until the jaw is open. To lock the probe, push the slide forward until
the detent snaps into place.
Getting Started
Probe open Probe locked
Figure 2: Operating the probe slide
A6302 and A6302XL Instructions
3
Getting Started
Degaussing and Autobalancing the Current Probe
Degaussing the probe removes any residual magnetization from the probe core.
Such residual magnetization can induce measurement error. Autobalancing
removes unwanted DC offsets in the amplifier circuitry.
Failure to degauss the probe is a leading cause of measurement errors. To
maintain measurement accuracy, degauss your probe in each of these cases:
H After turning on the amplifier and allowing a 20-minute warm-up period
H Before connecting the probe to a conductor, or changing conductors under
test
H Whenever an overload condition occurs
H Whenever the probe is subjected to a strong external magnetic field
H Periodically during normal use
Degauss and autobalance the current probe as follows
1. Verify that the current probe is connected to the amplifier.
2. Remove the current probe from the conductor under test.
3. Lock the probe slide closed (see Figure 2).
4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button.
NOTE. The degauss procedure will fail if the amplifier is not properly connected
toa50Ω termination impedance.
After you have completed the oscilloscope adjustments and the degauss/autobalance procedure, your system is ready to measure current.
Probe Trim Adjust for Gain Accuracy (AM503B and AM5030 Only)
After the PROBE DEGAUSS AUTOBALANCE routine has been run, the probe
and amplifier system will meet all published specifications; however, if you want
to improve the tolerance of the system gain accuracy, or to intentionally offset
the gain accuracy to make up for total system errors, the probe trim adjust
routine may be performed.
Probe trim adjust is a multiplicative factor that you can use to adjust the gain of
the current amplifier system. You can set this multiplier in increments of 0.001
from 0.750 through 1.250. Probe trim adjust is used for an optional calibration of
4
A6302 and A6302XL Instructions
some current probes. If you are not performing such an adjustment, leave probe
trim adjust to the factory-default of unity gain (1.000).
To set probe trim adjust, press and hold the 20MHz BW LIMIT button while
pressing and releasing the COUPLING button. Use the
adjust the setting that is displayed in the CURRENT/DIVISION display. When
finished, press either the 20MHz BW LIMIT or COUPLING button to restore
normal operation.
The display shows the last three significant digits of the display adjust setting;
the leading 0. or 1. are omitted. If the first digit displayed is 7, 8, or 9, then the
leading digit must be 0. If the first digit displayed is 0, 1, or 2, then the leading
digit must be 1.
Maximum Current Limits
Current probes have three maximum current ratings: continuous, pulsed, and
Ampere-second product. Exceeding any of these ratings can saturate the probe
core and cause measurement errors. The section titled Specifications on page 8
lists the maximum current ratings of the probe.
Getting Started
and buttons to
H Maximum Continuous Current refers to the maximum current that can be
continuously measured at DC or at a specified AC frequency. The maximum
continuous current value is derated with frequency; as the frequency
increases, the maximum continuous current rating decreases.
H Maximum Pulsed Current refers to the maximum peak value of pulsed
current the probe can accurately measure, regardless of how short (within
bandwidth limitations) the pulse duration.
H Ampere-Second Product defines the maximum width of pulsed current that
you can measure when the pulse amplitude is between the maximum
continuous and maximum pulsed current specifications. The maximum
continuous specification itself varies by frequency.
NOTE. Always degauss the probe after measuring a current that exceeds the
maximum continuous current, maximum pulsed current, or Ampere-second
product rating of the probe. Exceeding these ratings can magnetize the probe
and cause measurement errors.
To determine if your measurement exceeds the Ampere-second product, perform
either Procedure A or Procedure B:
A6302 and A6302XL Instructions
5
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