Tektronix A6312 100 MHz AC/DC Current Probes User manual
Instructions
A6312
100 MHz AC/DC Current Probe
070-9603-02
.
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.
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 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.
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 a ny
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 W ARRANTIES, 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 documentati on,
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 re p resentative 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
General Safety Summary v...................................
Preface vii...................................................
Contacting Tektronix viii.............................................
Getting Started 1............................................
Probe Installation 1................................................
Operating the Current Probe Slide 2...................................
Degaussing and Autobalancing the Current Probe 3......................
Maximum Current Limits 4..........................................
Specifications 7.............................................
Performance Verification 11...................................
Test Procedure Conditions 11.........................................
Equipment Preparation 11............................................
Required Test Equipment 12..........................................
Bandwidth 14......................................................
Rise Time 16......................................................
DC Gain Accuracy 19...............................................
Probe Trim Adjust for Gain Accuracy (AM503B and AM5030 Only) 22.......
DC Offset Adjustment 24......................................
Required Test Equipment 24..........................................
Equipment Connections 25...........................................
AM503B or AM5030 25.............................................
AM503A 27.......................................................
AM503 29........................................................
Maintenance 30..............................................
Cleaning 30.......................................................
Disassembly Instructions 30..........................................
Obtaining Replacement Parts 34.......................................
Preparation for Shipment 34..........................................
Replaceable Parts 35..........................................
Parts Ordering Information 35.........................................
Using the Replaceable Parts List 35....................................
A6312 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 5................
Figure 4: A6312 specified operating area 8......................
Figure 5: A6312 frequency derating curve for maximum
input current 8..........................................
Figure 6: A6312 insertion impedance curve 9....................
Figure 7: A6312 Probe jaw dimensions (nominal) 9...............
Figure 8: Bandwidth test setup for the A6312 current probe 14......
Figure 9: Rise time test setup for A6312 17.......................
Figure 10: DC gain accuracy test setup for A6312 20...............
Figure 11: A6312 DC offset adjustment location 24................
Figure 12: Removing the strain relief boot 31.....................
Figure 13: Removing the top half of the probe 32..................
Figure 14: Removing the probe slide 32..........................
Figure 15: Removing the current transformer 33..................
Figure 16: A6312 exploded view 37..............................
ii
A6312 Instructions
List of Tables
Table of Contents
Table 1: Warranted A6312 specifications 7......................
T able 2: Electrical characteristics 7............................
T able 3: Mechanical characteristics 9..........................
Table 4: Environmental characteristics 10.......................
Table 5: Certifications and compliances 10.......................
Table 6: Required test equipment 12............................
Table 7: Equipment settings for bandwidth 14....................
Table 8: Equipment settings for rise time 17.....................
T able 9: Equipment settings for DC gain accuracy 20..............
Table 10: DC gain accuracy test for A6312 21....................
Table 11: DC gain accuracy test work sheet for A6312 23...........
Table 12: Required test equipment 24...........................
Table 13: AM503B/AM 5030 settings for DC offset adjustment 25...
Table 14: AM 503B/AM 5030 error codes requiring
DC offset adjustment 26...................................
Table 15: AM503A settings for DC offset adjustment 27............
Table 16: AM503A error codes requiring DC offset adjustment 28...
Table 17: AM 503 settings for DC offset adjustment 29.............
A6312 Instructions
iii
Table of Contents
iv
A6312 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. R efer to
cleaning instructions.
A6312 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
A6312 Instructions
Preface
This instruction manual supports the operation and maintenance of the A6312
Current Probe with any of the AM503 series current probe amplifiers.
You can find additional documentation supporting the operation and maintenance
of the AM 503 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)
A6312 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
A6312 Instructions
Getting Started
Probe Installation
The A6312 is a DC to 100 MHz current probe designed for use with the AM503
series current probe amplifiers. With the AM503A amplifier, you can measure
frequencies up to 80 MHz. With the AM503, AM503B, and AM5030 amplifiers,
you can measure frequencies up to 100 MHz. The A6312 current probe can
measure currents to 20 A (DC + peak AC), and up to 50 A peak current (while
not exceeding the amp-second rating).
This section explains how to install and operate the A6312 current probe.
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.
A6312 Instructions
1
Getting Started
Amplifier
Push connector in
and twist to lock
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
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.
Current probe
connector
Groove
(b) Insert the connector into the amplifier
Alignment dot
2
A6312 Instructions
Getting Started
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.
Probe open Probe locked
Figure 2: Operating the probe slide
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.
A6312 Instructions
3. Lock the probe slide closed (see Figure 2).
4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button.
3
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