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 (“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
© 2006 Fluke Corporation. All rights reserved. Printed in China.
All product names are trademarks of their respective companies

771 English Instruction Sheet
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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: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]
Or visit Fluke’s Web site at: www.fluke.com.
Register the Meter at: http://register.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
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•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
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Getting Acquainted with the Meter
1
2
3
4
5
6
7
8
9
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
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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 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.

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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
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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.
OK
ege03.eps
Figure 2. Taking Measurements

771 English Instruction Sheet
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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.

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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
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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