Tektronix A621 Manual de usuario

Instructions

A621

1000 Amp AC Current Probe

070-8882-02

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 trademarks of Tektronix, Inc.

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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 replacement 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

replaced 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

modification or integration 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.

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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

www.tektronix.com/support

1-800-833-9200, select option 3*

6:00 a.m. -- 5:00 p.m. Pacific Standard Time

This phone number is toll free in North America. After office hours,

please 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.

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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. 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 measure-

ment 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.

Keep Product Surfaces Clean and Dry.

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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.

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. These symbols may appear on the product:

CAUTION

Refer to Manual

Double

Insulated

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Product Description

The Tektronix A621 current probe enables the display of current

waveforms up to 1000 amps RMS on Tektronix TDS, TAS, or

general purpose oscilloscopes. The A621 is especially useful where

the display and measurement of distorted current waveforms and

harmonics is required. The A621 is also compatible with DMMs by

using the BNC-to-banana plug adapter (recommended accessory, see

page 17 for more information).

Current Flow Symbol

This arrow shows the probe’s polarity convention for measuring

current flowing from positive to negative.

1000

100

Range Switch

Slide to select the measurement range of theprobe-

10/100/1000 A.

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Operating Basics

WARNING. Do not clamp the probe onto circuits with voltages greater

than 600 VAC. Personal injury or damage to the probe may result.

Always connect the probe to the instrument before clamping onto the

circuit under test.

Connect the probe BNC connector to the oscilloscope input. Start

by setting the oscilloscope channel vertical coupling to AC volts,

the vertical deflection to 0.1 V/div, and the probe to 1 mV/A.

Connect the probe to the circuit by opening the jaws and

clamping around the conductor. See Figure 1. Note: Clamping

around both the “hot” and neutral wires may give you a zero

reading.

To load

From source

Figure 1: Connecting the A621

(Remember to unclamp the probe from the conductor before

disconnecting it from your meter or instrument.)

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Operating Basics

Adjust the probe range and scope channel as necessary to get a

clear view of the signal.

The current drawn by some devices will look much different than

that of others. While the RMS current may be low, the momentary

peaks may be quite high. Figure 2 shows the difference between the

line current drawn by a resistive load and a motor controller.

Resistive Load

Motor Controller

Figure 2: Typical Current Waveforms

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Operating Basics

If you are using the A621 with a multimeter, use the BNC-to-banana

adapter (recommended accessory) to connect the probe. Connect the

black lead to the meter COM, and the red lead to the VΩinput. Set

the meter to the AC Volts position.

To increase the measurement sensitivity of the A621, loop additional

turns of the wire under test through the jaws. See Figure 3. The

sensitivity of the A621 will be multiplied times the number of loops

in the jaws. For example: 10 mV/A X 4 turns = 40 mV/A.

Figure 3: Increasing the A621 Sensitivity

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