Tektronix A622 Manual de usuario

Instructions

A622

100 Amp AC/DC Current Probe

070-8883-03

www.tektronix.com

*P070888303*

070888303

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.

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.

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 sup-

port

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.

A622 Instructions i

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.

Replace Batteries Properly. Replace batteries only with the proper type

and rating specified.

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.

General Safety Summary

ii A622 Instructions

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

A622 Instructions 1

Getting Started

The A622 current probe (Figure 1) enables a general purpose

oscilloscope to display AC and DC current signals up to 100 amps

Peak (70 A RMS). The A622 current probe can also make AC and

DC measurements with a multimeter by using the BNC-to-banana

plug adapter that is available as a recommended accessory. See

page 17 for ordering information.

OFF/Range switch

Zero adjustment

Battery

compartment

Current flow

symbol

Figure 1: A622 AC/DC Current Probe

Getting Started

2A622 Instructions

Table 1 highlights the controls and indicators on the A622 current

probe.

Table 1: A622 controls and indicators

Control/Indicator Description

Current flow symbol. The arrow show the probe’s polarity

convention for measuring current flowing from positive to

negative.

ZERO Zero adjustment. Rotate to adjust the probe output to zero when

there is no current present. It may also be used to offset a DC

signal component. Zeroing is not needed for AC measurements

unless your instrument cannot isolate a DC component (if

present).

OFF/Range switch. Slide the switch from OFF to either the

10 mV/A or 100 mV/A range. When either range is selected, the

probe is turned on, and the green battery indicator lights. If the

indicator does not light, see Battery Notes and Battery Installation

on page 7.

Battery indicator. The green battery indicator lights when the

probe is turned on. For more information, see Battery Notes and

Battery Installation on page 7.

Overload indicator. The red overload indicator lights if the

measured signal is greater that the selected range capacity.

Switch the probe to 10 mV/A if possible, or remove the probe from

the circuit.

A622 Instructions 3

Operating Basics

Before using the probe, the batteries must be installed. See the

battery installation instructions on page 7.

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.

1. Connect the probe BNC connector to the oscilloscope input. Start

by setting the oscilloscope channel vertical coupling to DC volts,

the vertical deflection to 0.1 V/div.

2. Move the OFF/Range switchtothe10 mV/A or 100 mV/A

position to power on the probe.

The A622 current probe has a green LED power/battery indicator.

If the LED does not light, replace the battery.

3. Use the ZERO adjustment to zero or offset the probe output.

4. Connect the probe to the circuit by opening the jaws and

clamping around the conductor. See Figure 2.

NOTE. Clamping around both the “hot” and neutral wires may give

you a zero reading.

(Remember to unclamp the probe from the conductor before

disconnecting it from your meter or instrument.)

Operating Basics

4A622 Instructions

Handles

Jaws

From

source

To load

Figure 2: Connecting the A622 current probe

5. Adjust the probe and channel as necessary to get a clear view of

the signal. Set the channel to DC volts to see both the AC and DC

currents; set the channel to AC to see the AC current only.

The current drawn by some devices looks much different than that of

others. While the RMS current may be low, the momentary peaks

may be quite high. Figure 3 shows the difference between the line

current drawn by a resistive load and a motor controller.

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