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 (“the Meter”) 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 (0-100 %)

•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

All product names are trademarks of their respective companies

771 English Instruction Sheet

Page 2

Contacting Fluke

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

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

Singapore: +65-738-5655

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

Or visit Fluke’s Web site at: www.fluke.com.

Safety Information and Symbols

A “XW Warning” statement identifies hazardous conditions

and actions that could cause bodily harm or death.

A “W Caution” statement identifies conditions and actions that

could damage the Meter or the equipment under test.

XWRead First: Safety Information

To ensure safe operation and service of the Meter, follow

these instructions:

•Read the Instruction Sheet before use and follow all

safety instructions.

•Use the Meter only as specified in the Instruction

Sheet; otherwise, the Meter's safety features may

be impaired.

•Before each use inspect meter and cable for

damage. Look for cracks and missing portions of

the clamp and cable. Do not use if clamp is

damaged.

•Use caution when working with voltages above 33

V rms 47 V peak or 70 V dc these voltages pose a

shock hazard.

•Do not use to measure ac current.

•Do not use to measure dc mA in circuits carrying

more than 300 V CAT II.

•Avoid working alone so assistance can be rendered

in an emergency.

771 English Instruction Sheet

Page 3

•Use extreme caution when working around bare

conductors or bus bars. Contact with the

conductor could result in electric shock.

•To avoid false readings that can lead to electrical

shock and injury, replace the batteries as soon as

the low battery indicator B appears.

•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 theTactile

Barrier.

•Not to be used on non-insulated conductors.

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

WRisk of danger. Important information. See Users Manual.

X Risk of Electrical Shock

TEquipment protected by double or reinforced insulation

M Battery

PConforms to relevant European Union directives

FDC (Direct Current)

~Do not dispose of this product as unsorted municipal

waste. Contact Fluke or a qualified recycler for disposal.

;

N10140 Conforms to relevant Australian standards

)Conforms to relevant Canadian and US standards

CAT II

300 V

Equipment is designed to protect against transients in

equipment in fixed-equipment installations, such as

distribution panels, feeders and short branch circuits, and

lighting systems in large buildings.

771 English Instruction Sheet

Page 4

Getting Acquainted with the Meter

ege01a.eps

Number Description

A Turns the Meter on and off. When the Meter is in sleep mode, press

this button to wake it up.

B Captures and holds the current reading

C Removes interference and zeros the display

D Measurement spotlight LED button

E Measurement spotlight LED

F Detachable clamp

G Turns the backlight off and on

H LCD

I Tactile Barrier docked and un-docked

Figure 1. The 771 Milliamp Process Clamp Meter

771 English Instruction Sheet

Page 5

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 Ato zero the display

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

no current is flowing through them.

Backlight

Press Cto turn the backlight on and off. The backlight

automatically turns off after 2 minutes.

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

Cwhile turning the Meter on.

Measurement Spotlight LED

The Measurement Spotlight LED helps to quickly find mA signal

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

automatically turns off after 2 minutes. To disable the automatic

timeout, hold down Lwhile turning the Meter on.

771 English Instruction Sheet

Page 6

Display HOLD

XWWarning

To avoid electric shock, when Display HOLD is

activated, the display will not change when a

different current is applied.

Pressing Hactivates Display Hold mode. His displayed

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

operation, press Ha second time.

Auto Off

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

disable the Auto Off feature, hold down Hwhile turning on the

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

pushing O(“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 7

1. With the clamp disconnected from any conductor, press O

to turn the Meter on and press A.

2. 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.eps

Figure 2. Taking Measurements

771 English Instruction Sheet

Page 8

Maintenance

XWWarning

To avoid possible electric shock or personal injury,

repairs or servicing not covered in this manual

should be performed only by qualified personnel.

Cleaning the Meter

XWWarning

To avoid electrical shock, remove any input signals

before cleaning.

WCaution

To avoid damaging 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.

771 English Instruction Sheet

Page 9

Battery Replacement

XWWarning

To avoid false readings, that could lead to possible

electric shock or personal injury, replace the battery

as soon as the low battery indicator (B) appears.

To replace the battery (see Figure 3):

1. Turn the Meter off.

2. Use a flat head screwdriver to loosen the battery

compartment door screw, and remove the door from the

case bottom.

3. Remove the battery.

4. Replace the battery with two new AA batteries.

5. Reattach the battery compartment door to the case bottom

and tighten the screw.

ege02.eps

Figure 3. Changing the Batteries

771 English Instruction Sheet

Page 10

Specifications

Current Ranges ±20.99 mA ±21.0 mA -±99.9 mA

Resolution 0.01 mA 0.1 mA

Accuracy

20.99 mA range

99.9 mA range

0.2 % reading ±5 digits

1 % reading ±5 digits

Maximum Reading ±99.9 mA

Influence of Earth’s Field < 0.20 mA

Battery 2 AA 1.5 V Alkaline, IEC LR6

Working hours 45 hours

Size (H X W X L) 59 mm x 38 mm x 212 mm

(with clamp nested)

Weight 260g (Including battery)

Operating Temperature -10 to 50 °C

Storage Temperature -25 to 70 °C

Operating Humidity < 90 % @ <30 °C,

<75 % @ 30 to 50 °C

Operating Altitude 0 to 2000 m

Storage Altitude None

IP Rating IP 40

Vibration Requirements Random 2 g, 5 to 500 Hz

EMI, RFI, EMC Meets all applicable requirements in

EN 61326-1

Temperature Coefficients 0.1x(specified accuracy)/°C

(< 18 °C or > 28 °C)

Measurement Category IEC 61010-1

61010-2-032

CAT II 300 V

CAT II Equipment is designed to

protect against transients from energy-

consuming equipment supplied from

the fixed installation, such as TVs,

PCs, portable tools, and other

household appliances.

Agency Approvals P, ),;, FCC

N10140

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