Fluke 772 Manuale utente
772/773 English Instruction Sheet
Page 1
772/773
Milliamp Process Clamp Meter
Instruction Sheet
Introduction
The hand-held, battery-operated Fluke 772 and 773 Milliamp Process
Clamp Meters (the Meter or Product) can be used in troubleshooting
transmitters, valves, PLC and DCS I/O. Unlike conventional clamp meters,
the Meter features a remote jaw that is connected to the main body via
extension cable.
Features
•In-circuit measurement of 0 mA to 24 mA dc and up to 99.9 mA dc
using a remotely connected clamp via extension cable
•0 mA to 24 mA dc sourcing and simulating
•0 V to 10 V dc sourcing (773)
•Loop power supply 24 V dc output
•0 V to 30 V dc measurement (773)
•Scaled mA output (773)
•Simultaneous mA measurement via detachable clamp and mA
sourcing (773)
•250 Ω HART resistor for mA source
•Electronic zero
•Percentage span (0 % to 100 %)
•Hold
•Auto power off (battery saver)
•Display backlight
•Measurement spotlight LED
PN 3351049
February 2009 Rev. 1, 5/19
© 2009-2019 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies. Specifications are subject to
change without notice.
772/773 English Instruction Sheet
Page 2
The Meter comes with:
• Four AA alkaline batteries (installed)
• Soft carrying case
• TL75 test leads
• AC 72 detachable clip
• TL 940 mini hook test leads
• Instruction sheet
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: +31 402-675-200
• Japan: +81-3-3434-0181
• 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.
• Read all safety information before you use the
Product.
• Do not use in CAT III or CAT IV environments without
the protective cap installed on test probe. The
protective cap decreases the exposed probe metal to
<4 mm. This decreases the possibility of arc flash
from short circuits.
772/773 English Instruction Sheet
Page 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.
• Do not touch voltages >30 V ac rms, 42 V ac peak, or
60 V dc.
• Remove the batteries if the Product is not used for an
extended period of time, or if stored in temperatures
above 50 °C. If the batteries are not removed, battery
leakage may result.
• The battery door must be closed and locked before
you operate the Product.
• Replace the batteries when the low battery indicator
shows to prevent incorrect measurements.
• Do not apply more than the rated voltage, between the
terminals or between each terminal and earth ground.
• Measure a known voltage first to make sure that the
Product operates correctly.
• Use the Clamp only on insulated conductors. Use
caution around bare conductors or bus bars. To
prevent electrical shock, do not touch the conductor.
• Do not use test leads if they are damaged. Examine
the test leads for damaged insulation, exposed metal,
or if the wear indicator shows. Check test lead
continuity.
• Hold the Product behind the tactile barrier.
• Keep fingers behind the finger guards on the probes.
• Remove all probes, test leads, and accessories before
the battery door is opened.
• Remove all probes, test leads, and accessories that
are not necessary for the measurement.
• Do not exceed the Measurement Category (CAT)
rating of the lowest rated individual component of a
Product, probe, or accessory.
• Do not use the Product if it operates incorrectly.
• Disable the Product if it is damaged.
• Do not make connections on hazardous live
conductors in damp or wet environments.
772/773 English Instruction Sheet
Page 4
Table 1 explains the symbols that are used on the Meter or in this
Instruction Sheet.
Table 1. Symbols
Symbol Explanation
Consult user documentation.
W WARNING. RISK OF DANGER.
X WARNING. HAZARDOUS VOLTAGE. Risk of electric shock.
Power on/off
-
Do not apply around or remove from uninsulated hazardous
live conductors without taking additional protective
measures.
T Double Insulated
DC (Direct Current)
Earth Ground
Battery
P Conforms to European Union directives.
Conforms to relevant Australian Safety and EMC standards.
) Certified by CSA Group to North American safety standards.
Measurement Category II is applicable to test and measuring
circuits connected directly to utilization points (socket outlets
and similar points) of the low-voltage MAINS installation.
Measurement Category III is applicable to test and
measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.
Measurement Category IV is applicable to test and
measuring circuits connected at the source of the building’s
low-voltage MAINS installation.
~
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.
772/773 English Instruction Sheet
Page 5
Getting Acquainted with the Meter
Figures 1-4 explain the Meter’s features, buttons, input/output jacks, and
display.
HART
mA SCALELOOP PWR
mA I N / OUT
Fjv06.emf
Number Description
Turn on and off the Meter
Measurement spotlight LED button
Turns the display backlight on and off
Switches the Meter to Clamp Measure mode. Zeros the clamp
reading in Clamp mode. The Clamp modes includes clamp
measure, mA scale output, and mA IN/OUT.
Press first to change to mA scale (773).
Cycles through source output ramping and 25 % stepping:
() Slow repeating 0 % - 100 % - 0 % ramp
() Fast repeating 0 % - 100 % - 0 % ramp
() Repeating 0 % - 100 % - 0 % ramp in 25 % steps
Press first to activate mA IN/OUT (773).
Captures and holds the current reading. Pressing first
activates the 250 Ω HART resistor.
activates features listed above some buttons
0 %-100 %- sets voltage or mA sourcing output. Press first to
activate , , , and to adjust the source output. Long press
or to set span range point.
Measure, Source, Simulate button
DC Volts selection (773)
mA selection. Press first to activate Loop Power function.
Figure 1. Buttons
772/773 English Instruction Sheet
Page 6
fjv05.emf
Number Description
Detachable clamp
Tactile Barrier docked and un-docked. Refer to Safety Information
and Symbols.
Display
Measurement spotlight LED
Figure 2. The Milliamp Process Clamp Meter
772/773 English Instruction Sheet
Page 7
MAX
Fjv07.emf
Number Description
Main display values
HOLD is activated
Clamp is active
Test lead jack indicator. Test lead connection is required.
HART 250 Ω resistor is engaged
Shift is active
Reading is scaled
Loop Power is active
Milliamps
Volts dc
Percentage
Secondary display
Ramping is engaged
Low battery symbol
Maximum voltage warning
High voltage is present
Measure, Source, or Simulate is active
Figure 3. Display (773 shown)
772/773 English Instruction Sheet
Page 8
Fjv04.emf
Number Description
Voltage measurement test lead input, also used for voltage
sourcing HI.
Common test lead input, also used for voltage sourcing LO.
-mA test lead input, also used for mA sourcing.
+mA test lead input, also used for mA sourcing.
Common test lead input. -mA test lead input. Also used for mA
sourcing.
Figure 4. Input/Output Jacks
Features
The following sections give more detail about the Meter’s features.
Percentage Span
The Source and Simulate Percentage Span feature displays the span for
4 to 20 mA loops. Use , , , and to adjust the source
or simulated current (772) or dc voltage and current (773).
20 mA 100 % 8 mA 25 %
16 mA 75 % 4 mA 0 %
12 mA 50 % 0 mA -25 %
Zero Adjust
Before taking measurements with the clamp, push to zero the
display by removing the offset. Make sure the clamp jaws are closed and
no current is flowing through them before zeroing.
Backlight
Press to turn the backlight on and off. The backlight automatically
turns off after 2 minutes.
772/773 English Instruction Sheet
Page 9
User Options
Several user options can be activated at Meter power up. Hold
when powering on the Meter. While holding down , toggle on/off
each option by repeatedly pressing the following keys:
• toggle on/off backlight auto off. Display shows bLit on or oFF.
• toggle on/off spotlight auto off. Display shows SLit on or oFF.
• toggle on/off auto power off. Display shows PoFF on or oFF.
When all key are released, the software version appears and the Meter
enters Clamp Measure mode.
Measurement Spotlight LED
The Measurement Spotlight LED helps to quickly find mA signal wires.
Press to activate it. To extend battery life, the light automatically turns
off after 2 minutes.
Display HOLD XW Warning
To prevent possible electrical shock, fire, or personal
injury:
• Be aware of the measurement being taken when using
Display HOLD. When Display HOLD is activated, the
display will not change when different currents are
applied.
• Do not use the HOLD function to measure unknown
potentials. When HOLD is turned on, the display does
not change when a different potential is measured.
Press to activate Display Hold mode. The display shows and
the display freezes. To exit and return to normal operation, press a
second time. When in Auto Ramping mode, stops ramping.
Auto Ramping the Output
Auto ramping can continuously apply a varying output from the mA
source to a device while your hands remain free to test the response.
When is pressed, the Meter produces a repeating 0 % - 100 % -
0 % ramp in a choice of three ramp waveforms:
• () 0 % - 100 % - 0 % 40-second smooth ramp
• () 0 % - 100 % - 0 % 30-second smooth ramp
• () 0 % - 100 % - 0 % 25 % step ramp, 10 seconds each step.
To exit ramping, press any button.
772/773 English Instruction Sheet
Page 10
Probe Holder
The Meter is equipped with a probe holder that can either hold a test
probe or can be used to attach the Fluke ToolPak. See Figure 5.
Fjv08.emf
Figure 5. The Probe Holder
Taking Measurements
XW Warning
To prevent possible electric shock, fire, or personal injury,
do not use the clamp on non-insulated conductors.
Measurements can be taken with the clamp in the docked position,
remotely using the 1 m cable, or via test leads. For accurate
measurements:
• Always zero the Meter prior to taking measurements with the clamp.
• To reduce magnetic influences, zero the Meter as close to the
measurement in the same position or jaw direction that is used for
the measurements as possible.
• Make sure the clamp is free of contamination.
To use the clamp for measurements:
1. Press to enter Clamp Measure mode and to zero the Meter.
Clamp mode includes clamp measure, mA scale output, and mA
IN/OUT. If necessary, press to change to mA scale.
2. Clamp the jaw around the conductor under test. The Meter displays
the measured conductor current. See Figure 6.
• 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.
The small secondary display shows the reading in mA percentage of
span.
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