Fluke 381 User manual

PN 3538357

July 2010

change without notice. All product names are trademarks of their respective companies.

381

Remote Display

True-rms

Clamp Meter

Users Manual

LIMITED WARRANTY AND LIMITATION OF LIABILITY

This Fluke product will be free from defects in material and workmanship for three years from the

date of purchase. This warranty does not cover fuses, disposable batteries, or damage from

accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or

handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf. To obtain

service during the warranty period, contact your nearest Fluke authorized service center to obtain

return authorization information, then send the product to that Service Center with a description of

the problem.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS

FOR A PARTICULAR PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE IS NOT LIABLE

FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES,

ARISING FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the

exclusion or limitation of an implied warranty or of incidental or consequential damages, this

limitation of liability may not apply to you.

Fluke Corporation

P.O. Box 9090

Everett, WA 98206-9090

U.S.A.

Fluke Europe B.V.

P.O. Box 1186

5602 BD Eindhoven

The Netherlands

11/99

Table of Contents

Title Page

Introduction................................................................................................................. 1

How to Contact Fluke ................................................................................................. 1

Safety Information ...................................................................................................... 2

Radio Frequency Data ............................................................................................... 7

Features ..................................................................................................................... 8

Remote Display ...................................................................................................... 8

Hazardous Voltage Indicator .................................................................................. 10

Flexible Current Probe ........................................................................................... 10

Auto Power Off ....................................................................................................... 10

Backlight................................................................................................................. 11

Display Hold ........................................................................................................... 11

MIN MAX AVG ....................................................................................................... 11

DC Current Zero..................................................................................................... 11

Inrush ..................................................................................................................... 12

Low Battery Indicators............................................................................................ 12

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Users Manual

Display.................................................................................................................... 17

Measurements............................................................................................................ 19

AC and DC Current (Jaw) ...................................................................................... 19

AC Current (Flexible Current Probe)...................................................................... 22

AC and DC Voltage ................................................................................................ 23

Resistance/Continuity............................................................................................. 26

Inrush Current Measurement (Jaw and Flexible Current Probe) ........................... 26

Frequency Measurement (Jaw and Flexible Current Probe) ................................. 28

Maintenance............................................................................................................... 28

Cleaning the Meter and Flexible Current Probe..................................................... 28

Battery Replacement.............................................................................................. 29

User-Replaceable Parts ............................................................................................. 31

Specifications ............................................................................................................. 32

Electrical Specifications.......................................................................................... 32

Mechanical Specifications...................................................................................... 37

Environmental Specifications ................................................................................. 38

Introduction

XWWarning

Read "Safety Information" before you use the Meter.

The Fluke 381 is a handheld, battery-operated Clamp Meter (the Meter) that has a remote-display

module and detachable iFlex (Flexible Current Probe). The Remote Display can be removed from

the Meter body and read away from the measurement source. This lets the display be easily read

in difficult-measurement situations such as a hazardous environments, or very tight spaces. The

Flexible Current Probe makes it possible to measure higher current (up to 2500 A ac) and larger

cables that traditional jawed meters cannot measure.

How to Contact Fluke

To contact Fluke, call one of the following telephone numbers:

•Technical Support USA: 1-800-44-FLUKE (1-800-443-5853)

•Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853)

•Canada: 1-800-36-FLUKE (1-800-363-5853)

•Europe: +31 402-675-200

•Japan: +81-3-3434-0181

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Users Manual

•Singapore: +65-738-5655

•Anywhere in the world: +1-425-446-5500

Or, visit Fluke's website at www.fluke.com.

To register your product, visit http://register.fluke.com.

To see, print, or download the latest manual supplement, visit

http://us.fluke.com/usen/support/manuals.

Safety Information

A Warning identifies conditions and actions that pose hazard(s) to the user; A Caution identifies

conditions and procedures that could cause Meter damage, equipment under test damage, or

permanent loss of data.

Symbols used on the Meter and in this manual are explained in Table 1.

XWWarning

To prevent possible electrical shock or personal injury, follow these guidelines:

•Use the Meter only as specified in this manual or the protection provided by the

Meter can be compromised.

•Examine the case before you use the Meter. Look for cracks or missing plastic.

Carefully look at the insulation around the connectors.

•Never measure ac current while the test leads are inserted into the input jacks.

•Make sure the battery door is closed and latched before operating the Meter.

•Remove the test leads from the Meter before the battery door is opened.

Remote Display True-rms Clamp Meter

Safety Information

•Examine the test leads for damaged insulation or exposed metal. Check test lead

continuity. Replace damaged test leads before using the Meter.

•Do not use the Meter if it operates incorrectly. Protection can be compromised.

When in doubt, have the Meter serviced.

•Do not use the Meter around explosive gas, vapor or in damp or wet

environments.

•Use only type AAA batteries, properly installed in the Meter case, to power the

Meter.

•To avoid false readings that can lead to electrical shock and injury, replace the

batteries as soon as the low battery indicator (Bor Q)

appears.

•When servicing the Meter, use only specified replacement parts. See Table 5.

•Have the Meter serviced only by qualified service personnel.

•Be careful around voltages > 30 V ac rms, 42 V ac peak, or 60 V dc. Such

voltages pose a shock hazard.

•Do not apply more than the rated voltage, as marked on the Meter, between the

terminals or between any terminal and earth ground.

•When using the probes, keep fingers behind the finger guards on the probes.

•Connect the common test lead before connecting the live test lead. When

disconnecting test leads, disconnect the live test lead first.

•Do not work alone so assistance can be rendered in an emergency.

381

Users Manual

•Use extreme caution when working around bare conductors or bus bars. Contact

with the conductor could result in electric shock.

•Adhere to local and national safety codes. Individual protective equipment must

be used to prevent shock and arc blast injury where hazardous live conductors

are exposed.

•When measuring, keep fingers behind the Tactile Barrier. See Figure 2.

•Disconnect circuit power and discharge all high-voltage capacitors before you

do diode tests or measure resistance, continuity, or capacitance.

•Do not measure ac/dc current in circuits carrying more than 1000 V or 1000 A

with the Meter Jaw.

•Never operate the Meter with the back cover removed or the case open.

•Do not measure ac current in circuits carrying more than 1000 V or 2500 A with

the Flexible Current Probe.

•Do not apply the Flexible Current Probe around or remove from HAZARDOUS

LIVE conductors.

•Take special care during fitting and removal of the Flexible Current Probe. De-

energize the installation under test or wear suitable protective clothing.

WCaution

To avoid possible damage to the Meter or to equipment under test:

•Use the proper jacks, function, and range for the measurement application.

Remote Display True-rms Clamp Meter

Safety Information

Table 1. Symbols

Symbol Meaning Symbol Meaning

BAC (Alternating Current) JEarth ground

FDC (Direct Current) PAC and dc current.

XHazardous voltage PConforms to European Union

directives.

WRisk of Danger. Important

information. See Manual. )Conforms to relevant North American

Safety Standards.

BBattery. Low battery when shown. TDouble insulated

~Do not dispose of this product as unsorted municipal waste. Go to Fluke’s website for

recycling information.

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Users Manual

Symbol Meaning Symbol Meaning

CAT III

IEC Measurement Category III

CAT III equipment has protection

against transients in equipment in

fixed-equipment installations, such

as distribution panels, feeders and

short branch circuits, and lighting

systems in large buildings.

CAT IV

IEC Measurement Category IV

CAT IV equipment has protection

against transients from the primary

supply level, such as an electricity

Meter or an overhead or underground

utility service.

®Examined and licensed by TÜV

Product Services. ;Conforms to relevant Australian

standards.

-Do not apply to or remove from

HAZARDOUS LIVE conductors. ,Application around and removal from

HAZARDOUS LIVE conductors is

permitted.

Note

The Measurement Category (CAT) and voltage rating of any combination of test probe,

test probe accessory, current clamp accessory, and the Meter is the LOWEST rating of

any individual component.

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