Fluke 771 Manuale utente

771 English Instruction Sheet

Page 1

771

Milliamp Process Clamp Meter

Instruction Sheet

Introduction

The Fluke 771 Milliamp Process Clamp Meter (Meter or Product)

is a hand-held battery-operated clamp meter that measures

4-20 mA dc without breaking the electrical circuit. Unlike

conventional clamp meters, the Meter features a remote jaw that

is connected to the main body via extension cable.

Features

•DC mA measurement (4-20 mA) using a remotely connected

clamp via extension cable

•Electronic zero

•Percentage span (0 % to 100 %)

•Hold

•Display backlight

•Auto power off

•Measurement spotlight LED

The Meter comes with:

•Two AA alkaline batteries (installed)

•Soft case

•Instruction sheet

PN 2567301

September 2006 Rev. 1, 7/19

trademarks of their respective companies. Product specifications are subject to

change without notice.

771 English Instruction Sheet

Page 2

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: +81-3-6714-3114

•Singapore: +65-6799-5566

•China: +86-400-921-0835

•Brazil: +55-11-3530-8901

•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 view, print, or download the latest manual supplement, visit

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

Safety Information and Symbols

A Warning identifies conditions and procedures that are

dangerous to the user. A Caution identifies conditions and

procedures that can cause damage to the Product or the

equipment under test.

XW Warning

To prevent possible electrical shock, fire, or

personal injury:

•Carefully read all instructions.

•Do not alter the Product and use only as

specified, or the protection supplied by the

Product can be compromised.

771 English Instruction Sheet

Page 3

•Before each use, inspect the Meter and cable

for damage. Look for cracks and missing

portions of the clamp and cable. Do not use if

clamp is damaged.

•Do not use to measure ac current.

•Do not touch voltages >30 V ac rms, 42 V ac

peak, or 60 V dc.

•Do not work alone.

•Use the Clamp only on insulated conductors.

Use caution around bare conductors or bus

bars. To prevent electrical shock, do not touch

the conductor.

•Replace the batteries when the low battery

indicator shows to prevent incorrect

measurements.

•Comply with local and national safety codes.

Use personal protective equipment (approved

rubber gloves, face protection, and flame-

resistant clothes) to prevent shock and arc

blast injury where hazardous live conductors

are exposed.

•Hold the Product behind the tactile barrier. See

Figure 1.

•Not to be used on non-insulated conductors.

771 English Instruction Sheet

Page 4

Table 1 explains the symbols that are used on the Meter or in this

instruction sheet.

Table 1. Symbols

-Do not apply around, or remove from HAZARDOUS LIVE

conductors

»Consult user documentation.

WWARNING. RISK OF DANGER.

WARNING. HAZARDOUS VOLTAGE. Risk of electric shock.



On/Off

Battery

DC (Direct Current)

¨Avoid strong magnetic fields.

Conforms to European Union directives.

Conforms to relevant Australian Safety and EMC standards

)

Certified by CSA Group to North American safety standards.

This product complies with the WEEE Directive marking

requirements. The affixed label indicates that you must not

discard this electrical/electronic product in domestic

household waste. Product Category: With reference to the

equipment types in the WEEE Directive Annex I, this product

is classed as category 9 "Monitoring and Control

Instrumentation" product. Do not dispose of this product as

unsorted municipal waste.

771 English Instruction Sheet

Page 5

Getting Acquainted with the Meter

ege01a.emf

Item Description



Turn on and turn off the Meter. When the Meter is in

sleep mode, press this button to wake it up.



Captures and holds the current reading



Removes interference and zeros the display



Measurement spotlight LED button



Measurement spotlight LED



Detachable clamp

Turns the backlight off and on

LCD



Tactile Barrier docked and un-docked

Figure 1. The 771 Milliamp Process Clamp Meter

771 English Instruction Sheet

Page 6

Features

The following sections give more detail about the Meter’s

features.

Percentage Span

The Percentage Span feature displays the span for 4 to 20 mA

loops.

20 mA

100 %

4 mA

0 %

16 mA

75 %

3.6 mA

-2.5 %

12 mA

50 %

3.2 mA

-5.0 %

8 mA

25 %

2 mA

-12.5 %

Zero Adjust

Before taking each measurement, push to zero the display

by removing dc offset. Make sure the clamp jaws are closed and

no current is flowing through them.

Backlight

Press to turn the backlight on and off. The backlight

automatically turns off after 2 minutes.

To disable the automatic 2-minute backlight timeout, hold down

while turning the Meter on.

Measurement Spotlight LED

The Measurement Spotlight LED helps to quickly find mA signal

wires. To activate it, press . To extend battery life, the light

automatically turns off after 2 minutes. To disable the automatic

timeout, hold down while turning the Meter on.

771 English Instruction Sheet

Page 7

Display HOLD

WX Warning

To prevent electric shock, when Display HOLD is

activated, the display will not change when a

different current is applied.

Pressing activates Display Hold mode. The display shows

and the Meter freezes the display. To exit and return to

normal operation, press a second time.

Auto Off

The Meter automatically turns off after 15 minutes of inactivity. To

disable the Auto Off feature, hold down while turning on the

Meter. If the Meter has automatically shut down, restart it by

pushing (“WAKE UP”).

Taking Measurements

XW Warning

The Clamp Meter is not for use on non-insulated

conductors.

Measurements can be taken with the clamp in the docked

position, or remotely via the 1 m cable. For accurate

measurements:

•Always zero the Meter prior to taking measurements.

•Zero the Meter as close to the measurement source as

possible.

•Make sure the clamp is free of contamination.

Note

To reduce magnetic influences, zero the Meter in the

same position or jaw direction that is used for the

measurements.

771 English Instruction Sheet

Page 8

With the clamp disconnected from any conductor, press to

turn on the Meter and press .

Clamp the jaw around the conductor under test. The Meter

displays the measured conductor current. See Figure 2.

A positive reading indicates current flowing in the direction of the

arrow on the clamp.

A negative reading indicates current flowing in the opposite

direction of the arrow.

Do not clamp more than one wire. Currents cancel and no results

are returned.

The small secondary display shows the reading in terms of

percentage span.

ege03.emf

Figure 2. Taking Measurements

771 English Instruction Sheet

Page 9

Maintenance

XW Warning

To prevent possible electric shock or personal injury,

repairs or servicing not covered in this manual

should be performed only by qualified personnel.

Cleaning the Meter

XW Warning

To prevent electrical shock, remove any input

signals before cleaning.

WCaution

To prevent damage to the Meter, do not use

aromatic hydrocarbons or chlorinated solvents

for cleaning. These solutions will react with the

plastics used in the Meter.

Clean the instrument case with a damp cloth and mild detergent.

Note

Dirt or debris on the surface of the sensor in the clamp

jaw will impact the precision of measurements. For best

performance, clean the sensor surfaces with a soft cloth

and a solution of Isopropyl alcohol as needed.

Battery Replacement

XW Warning

To prevent possible electrical shock, fire, or

personal injury:

•Replace the batteries when the low battery

indicator shows to prevent incorrect

measurements.

•Remove the batteries if the Product is not used

for an extended period of time, or if stored in

temperatures >50 °C. If the batteries are not

removed, battery leakage may result.

771 English Instruction Sheet

Page 10

To replace the batteries (see Figure 3):

1. Turn off the Meter.

2. Use a flat head screwdriver to loosen the battery

compartment door screw and remove the door from the case

bottom.

3. Remove the batteries.

4. Replace the batteries with two new AA batteries.

5. Reattach the battery compartment door to the case bottom

and tighten the screw.

ege02.emf

Figure 3. Changing the Batteries

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