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) 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

All product names are trademarks of their respective companies. Specifications are subject to

change without notice. Printed in China.

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: +65-738-5655

•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 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

Page 3

•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

Page 4

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

Fjv06.eps

Number Description

ATurns the Meter on and off

BMeasurement spotlight LED button

CTurns 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 Nfirst 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 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

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

772/773 English Instruction Sheet

Page 5

773

MILLIAMP PROCESS

CLAMP METER

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

Page 6

MAX

156

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

Page 7

773 772

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

Page 8

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

772/773 English Instruction Sheet

Page 9

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.

fjv03.eps

Figure 6. Taking Measurements with the Clamp

772/773 English Instruction Sheet

Page 10

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.

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