Fluke 772 User manual

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) 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 0-24 mA dc and up to 99.9 mA dc using a
remotely connected clamp via extension cable
•0-24 mA dc sourcing and simulating
•0-10 V dc sourcing (773)
•Loop power supply 24 V dc output
•0-30 V dc measurement (773)
•Scaled mA output (773)
•Simultaneous mA measurement via detachable clamp and mA
sourcing (773)
•250 ΩHART resistor for mA source
•Electronic zero
•Percentage span (0-100 %)
•Hold
•Auto power off (battery saver)
•Display backlight
•Measurement spotlight LED
PN 3351049
February 2009
© 2009 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies. Specifications are subject to
change without notice. Printed in China.

772/773 English Instruction Sheet
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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: [phone]
•Japan: [phone]
•Singapore: [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 statement identifies hazardous conditions and actions that
could cause bodily harm or death.
A Caution statement identifies conditions and actions that could damage
the Meter or the equipment under test.
XW Read 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 the 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 ac voltage.
•Avoid working alone so assistance can be rendered in
an emergency.

772/773 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 Bappears.
•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 the Tactile
Barrier. See Figure 1.
•Do not use on non-insulated conductors.
•Do not use near strong magnetic fields.
•Remove test leads before opening case.
Table 1 explains the symbols that are used on the Meter or in this
Instruction Sheet.
Table 1. Symbols
Symbol Explanation
-Do not apply around, or remove from HAZARDOUS LIVE
conductors.
WRisk of danger. Important information. See Users Manual.
XRisk of Electrical Shock.
TEquipment protected by double or reinforced insulation.
BBattery
PConforms to relevant European Union directives.
FDC (Direct Current)
JEarth Ground
~Do not dispose of this product as unsorted municipal waste.
Go to Fluke’s website for recycling information.
;Conforms to relevant Australian standards.
)Conforms to relevant Canadian and US standards.

772/773 English Instruction Sheet
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Getting Acquainted with the Meter
Figures 1-4 explain the Meter’s features, buttons, input/output jacks, and
display.
HART
mA SCALELOOP PWR
mA IN/OUT
3
9
10
11
1
4
5
6
7
8
2
Fjv06.eps
Number Description
ATurns the Meter on and off
BMeasurement spotlight LED button
CTurns the display backlight on and off
D
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 Nfirst to change to mA scale (773).
E
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 Nfirst to activate mA IN/OUT (773).
FCaptures and holds the current reading. Pressing Nfirst
activates the 250 ΩHART resistor.
GNactivates features listed above some buttons
H
0 %-100 %- sets voltage or mA sourcing output. Press Nfirst to
activate U, V, X, and Wto adjust the source output. Long press
Gor Dto set span range point.
IMeasure, Source, Simulate button
JDC Volts selection (773)
KmA selection. Press Nfirst to activate Loop Power function.
Figure 1. Buttons

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773
MILLIAMP PROCESS
CLAMP METER
3
1
42
Fjv05.eps
Number Description
ADetachable clamp
BTactile Barrier docked and un-docked. Refer to “Safety Information
and Symbols”.
CDisplay
DMeasurement spotlight LED
Figure 2. The Milliamp Process Clamp Meter

772/773 English Instruction Sheet
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MAX
2
156
7
9
10
11
12
13
14
15
16
8
3
17
4
Fjv07.eps
Number Description
AMain display values
BHOLD is activated
CClamp is active
DTest lead jack indicator. Test lead connection is required.
EHART 250 Ωresistor is engaged
FShift is active
GReading is scaled
HLoop Power is active
IMilliamps
JVolts dc
KPercentage
LSecondary display
MRamping is engaged
NLow battery symbol
OMaximum voltage warning
PHigh voltage is present
QMeasure, Source, or Simulate is active
Figure 3. Display (773 shown)

772/773 English Instruction Sheet
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1
2
3
4
773 772
54
Fjv04.eps
Number Description
AVoltage measurement test lead input, also used for voltage
sourcing HI.
BCommon test lead input, also used for voltage sourcing LO.
C-mA test lead input, also used for mA sourcing.
D+mA test lead input, also used for mA sourcing.
ECommon 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 G, F, E, and Dto 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 Cto 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 Qto turn the backlight on and off. The backlight automatically
turns off after 2 minutes.

772/773 English Instruction Sheet
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User Options
Several user options can be activated at Meter power up. Hold N
when powering on the Meter. While holding down N, toggle on/off
each option by repeatedly pressing the following keys:
•Qtoggle on/off backlight auto off. Display shows bLit on or oFF.
•Atoggle on/off spotlight auto off. Display shows SLit on or oFF.
•Htoggle 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 Ato activate it. To extend battery life, the light automatically turns
off after 2 minutes.
Display HOLD
XW Warning
To avoid electric shock, 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.
Press Hto activate Display Hold mode. The display shows Iand
the display freezes. To exit and return to normal operation, press Ha
second time. When in Auto Ramping mode, Hstops 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 Kis 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.
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.eps
Figure 5. The Probe Holder

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Taking Measurements
XW Warning
To avoid electric shock, 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 Cto enter Clamp Measure mode and to zero the Meter.
Clamp mode includes clamp measure, mA scale output, and mA
IN/OUT. If necessary, press Nto 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.
OK
fjv03.eps
Figure 6. Taking Measurements with the Clamp

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To use the test leads for measurements:
1. Insert the test leads into the proper input jacks. See Figure 7.
2. Press the correct button for the measurement.
3. Apply the test leads.
4. Observe the reading on the main display. In mA mode, the
secondary display shows the reading in percentage of span.
HART
mA SCALELOOP PWR
mA IN/ OUT
fjv09.eps
Figure 7. Taking Measurements with the Test Leads
Current and Voltage Output Functions
Both Meters provide steady, stepped, and ramped current output for
testing 0-24 mA current loops. Additionally, the 773 provides voltage
output to 10 V. To access these functions, press Tas necessary.
•Choose Source mode to supply current or voltage.
•Choose Simulate mode to regulate current in an externally powered
current loop.
•Choose Loop Supply mode to power an external device and
measure mA loop current.
Sourcing mA
Use mA Source mode whenever it is necessary to source current into a
passive circuit such as a current loop with no loop supply. Source mode
depletes the battery faster than Simulate mode.
To enter Source mode for the 772, see Figure 4:
1. Insert the test leads into the -mA and +mA jacks.
2. Press L.
3. Press
Tuntil Source appears on the display.