Fluke 771 Use and care manual

771
Milliamp Process Clamp Meter
Calibration Manual
November 2007 Rev. 1, 7/19
© 2007-2019 Fluke Corporation. All rights reserved. Product specifications are subject to change without notice.
All product names are trademarks of their respective companies.

LIMITED WARRANTY AND LIMITATION OF LIABILITY
This Fluke product will be free from defects in material and workmanship for 3 years (one year for cable and
clamp) from the date of purchase. This warranty does not cover fuses, disposable batteries or damage from
accident, neglect, misuse 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, send your
defective Meter to the nearest Fluke Authorized 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
ООО «Флюк СИАЙЭС»
125167, г. Москва,
Ленинградский проспект дом 37,
корпус 9, подъезд 4, 1 этаж
11/99

i
Table of Contents
Title Page
Introduction ........................................................................................................ 1
Contacting Fluke ................................................................................................ 2
Safety Information .............................................................................................. 2
Symbols ............................................................................................................. 3
Specifications ..................................................................................................... 4
Getting Acquainted with the Meter ..................................................................... 5
Maintenance ....................................................................................................... 7
Cleaning the Meter ........................................................................................ 7
Battery Replacement ..................................................................................... 7
Performance Tests ............................................................................................. 9
Required Equipment ...................................................................................... 9
Testing the Batteries ...................................................................................... 9
Testing the Display ........................................................................................ 10
Display Hold Test ........................................................................................... 10
Backlight Test ................................................................................................ 10
Spotlight LED Test ......................................................................................... 10
Zero Test ....................................................................................................... 10
Accuracy Tests .............................................................................................. 11
Calibration Adjustment ....................................................................................... 12
Adjustment Subroutines ................................................................................. 12
Front Panel Operation for Adjustment ........................................................... 12
Calibration Error Messages ........................................................................... 13
Calibration Adjustment Procedure ................................................................. 13
Temperature Adjustment Procedure ............................................................. 14
Low Range Adjustment Procedure ................................................................ 14
High Range Adjustment Procedure ............................................................... 14
Phase Adjustment Procedure ........................................................................ 15
User Replaceable Parts ..................................................................................... 16

771
Calibration Manual
ii

1
771
Milliamp Process Clamp Meter
Introduction
XW Warning
To prevent electric shock or personal injury, do not perform the
calibration verification tests or calibration procedures
described in this manual unless you are qualified to do so.
The information provided in this manual is for the use of
qualified personnel only.
This manual provides the complete verification and adjustment procedure for the
771 Milliamp Process Clamp Meter (the Meter or Product).
The Meter allows closed-case calibration using reference sources. It measures
the reference signals, calculates the correction factors, and stores them in
memory. The instrument should be calibrated after repair, or if it fails a
performance test.
The 771 Calibration Manual provides the following information:
• Precautions and safety information
• Specifications
• Basic maintenance
• Calibration verification procedure
• Replaceable parts and accessories
For complete operating instructions, refer to the 771 Instruction Sheet.

771
Calibration Manual
2
Contacting 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
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.
XWWarning
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.
• 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.

Milliamp Process Clamp Meter
Symbols
3
• 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.
• Do not use on non-insulated conductors.
WCaution
To prevent damage to the Meter, do not open the Meter for
cleaning. Do not use solvents to clean it, and do not immerse it
in liquid.
Symbols
Table 1 explains the symbols that are used on the Meter or in this manual.
Table 1. Symbols
- Do not apply around, or remove from HAZARDOUS LIVE conductors
 Consult user documentation.
W WARNING. RISK OF DANGER.
X WARNING. HAZARDOUS VOLTAGE. Risk of electric shock.
 On/Off
 Battery
 DC (Direct Current)
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
Calibration Manual
4
Specifications
Current Ranges ±20.99 mA ±21.0 mA to ±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
Battery Life 40 hours
Size (H X W X L) 59 mm x 38 mm x 212 mm (2.32 in x 1.49 in x 8.34 in)
(with clamp nested)
Weight 260 g (9.17 oz) (Including battery)
Operating Temperature -10 °C to 50 °C (14 °F to 122 °F)
Storage Temperature -25 °C to 60 °C (-13 °F to 140 °F)
Operating Humidity <90 % @ <30 °C (86 °F)
<75 % @ 30 °C to 50 °C (86 °F to 122 °F)
Operating Altitude 0 m to 2000 m
Storage Altitude None
IP Rating IP40
Vibration Requirements Random 2 g, 5 Hz to 500 Hz
Temperature Coefficients 0.1x (specified accuracy)/°C (<18 °C or >28 °C)
AC Noise Rejection ≥5 Hz, the Meter reading is the mean value of the measured current
Diameter of Measurable
Conductor
4.5 mm maximum
Electrical Compatibility (EMC)
General IEC 61010-1: Pollution Degree 2
International
IEC 61326-1: Portable Electromagnetic Environment;
IEC 61326-2-2
CISPR 11: Group 1, Class A
Group 1: Equipment has intentionally generated and/or uses conductively-coupled radio frequency
energy that is necessary for the internal function of the equipment itself.
Class A: Equipment is suitable for use in all establishments other than domestic and those directly
connected to a low voltage power supply network that supplies buildings used for domestic purposes.
There may be potential difficulties in ensuring electromagnetic compatibility in other environments due to
conducted and radiated disturbances.
Caution: This equipment is not intended for use in residential environments and may not provide
adequate protection to radio reception in such environments.

Milliamp Process Clamp Meter
Getting Acquainted with the Meter
5
Getting Acquainted with the Meter
Figure 1 shows the Meter functions and features.
1
2
3
4
5
6
e
g
e01a.emf
Number 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
 Turn on and turn off the backlight
 LCD
 Tactile Barrier docked and un-docked
Figure 1. The 771 Milliamp Process Clamp Meter

771
Calibration Manual
6
h Static Awareness h
X Semiconductors and integrated circuits can be damaged by electrostatic
discharge during handling. This notice explains how to minimize damage to
these components.
1. Understand the problem.
2. Learn the guidelines for proper handling.
3. Use the proper procedures, packaging, and bench techniques.
Follow these practices to minimize damage to static sensitive parts.
XW Warning
To prevent electric shock or personal injury. De-
energize the product and all active circuits before
opening a product enclosure, touching or handling
any PCBs or components.
• Minimize handling.
• Handle static-sensitive
parts by non-conductive
edges.
• Do not slide static-
sensitive components
over any surface.
• When removing plug-in
assemblies, handle only
by non-conductive
edges.
• Never touch open-edge
connectors except at a
static-free work station.
• Keep parts in the original
containers until ready for
use.
• Use static shielding
containers for handling
and transport.
• Avoid plastic, vinyl, and
Styrofoam® in the work
area.
• Handle static-sensitive
parts only at a static-
free work station.
• Put shorting strips on
the edge of the
connector to help
protect installed static-
sensitive parts.
• Use anti-static type
solder extraction tools
only.
• Use grounded-tip
soldering irons only.