Fluke 771 User manual

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
© 2006-2019 Fluke Corporation. All rights reserved. All product names are
trademarks of their respective companies. Product specifications are subject to
change without notice.

771 English Instruction Sheet
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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: [phone]
•Japan: [phone]
•Singapore: [phone]
•China: [phone]
•Brazil: [phone]
•Anywhere in the world: [phone]
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
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•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.

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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.
X
WARNING. HAZARDOUS VOLTAGE. Risk of electric shock.

On/Off
M
Battery
F
DC (Direct Current)
¨Avoid strong magnetic fields.
P
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
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Getting Acquainted with the Meter
1
2
3
4
5
6
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

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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.

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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.

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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.
OK
ege03.emf
Figure 2. Taking Measurements

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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
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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