Fluke 705 Manuale utente

English Instruction Sheet

Page 1

705

Loop Calibrator

Instruction Sheet

Introduction

The Fluke 705 Loop Calibrator is a source and measurement tool

for 0 to 20 mA or 4 to 20 mA current loop testing and a

measurement tool for dc voltage from 0 to 28 V. The calibrator

does not source and measure simultaneously.

Your calibrator is supplied with a set of TL75 test leads, AC72

alligator clips, 9 V installed alkaline battery, and this instruction

sheet.

Summary of Calibrator Capabilities

Function Range Resolution

dc V input +28 V 0.001 V

dc mA input 0 to 24 mA 0.001 mA

dc mA output

Loop power

output 24 V dc output N/A

Safety Information

Use the calibrator only as specified in this sheet, otherwise the

protection provided by the calibrator may be impaired.

A Warning identifies conditions and actions that pose hazard(s)

to the user; a Caution identifies conditions and actions that may

damage the calibrator or the equipment under test.

August 1998 Rev.2, 6/03

All product names are trademarks of their respective companies

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English Instruction Sheet

Page 2

WWarning

To avoid possible electric shock or personal injury:

•Never apply more than 30 V between any two

terminals, or between any terminal and earth

ground.

•Inspect the test leads for damaged insulation or

exposed metal. Check lead continuity. Replace

damaged test leads before you use the meter.

•Make sure the battery door is closed and latched

before you operate the calibrator.

•Remove test leads from the calibrator before you

open the battery door.

•Do not operate calibrator if it is damaged.

•Do not operate the calibrator around explosive gas,

vapor, or dust. Caution

Use the proper terminals, function, and range for your

measurement or output application.

Explanation of International Symbols

International Symbols

Symbol Meaning

JEarth ground

MBattery

WRefer to this instruction sheet for information about

this feature.

TDouble insulated

Conforms to relevant Canadian Standards

Association directives.

PConforms to European Union directives

Direct current

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English Instruction Sheet

Page 3

Pushbutton Functions

Button Function

M+P

Press to select source, simulate, or measure

modes.

Press while turning on the calibrator to select loop

power. The Loop symbol appears in the display.

Press simultaneously to start the SpanCheck

function. The Ssymbol appears in the

display. Output toggles between 0 % and 100 %.

PPress to manually step the output up or down 25

D+U

Dor U

Press both buttons simultaneously to select auto

ramp output. The

EON

symbols appear in the

display.

Press to scroll the display up or down.

Press while turning on the calibrator to change and

save scroll steps to 0.001 mA.

Press while turning on the calibrator to toggle

between 0 to 20 mA and 4 to 20 mA and save the

current output span in a nonvolatile memory.

Using the Current Output Modes

The calibrator provides current output for calibrating and testing

0 to 20 mA and 4 to 20 mA current loops and instruments.

In source mode, the calibrator supplies the current. In simulate

mode, the calibrator simulates a two-wire transmitter in an

externally-powered current loop.

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English Instruction Sheet

Page 4

Sourcing mA

Use source mode whenever you need to supply current into a

passive circuit. Insert the test leads into the terminals as shown

below.

Note

A path must exist for current to flow between the output

+and −mA terminals, otherwise the display will indicate

an overload (OL) when you set an output value.

OFF

COM +

705

LOOP CALIBRATOR

SOURCE

SIMULATE

MEASURE

VDC

SpanCheck

Loop Power

Source

Press to toggle

Source or Simulate.

Press to step output

up/down in 25 %

steps.

Press to scroll

up/down 0.01 mA.

Hold down to scroll

faster.

For 0.001 mA steps,

see “Pushbutton

Functions.”

Press simultaneously

once for slow ramp

twice for fast ramp

three times for

stepped ramp.

rt04f.eps

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English Instruction Sheet

Page 5

How to Contact Fluke

LIMITED WARRANTY & LIMITATION OF LIABILITY

This Fluke product will be free from defects in material and workmanship

for three years 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 calibrator 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.

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English Instruction Sheet

Page 6

Simulating a Transmitter

When simulating the operation of a transmitter, the calibrator

regulates the loop current to a known value that the user selects.

A 12 to 28 V loop supply must be available. Insert the test leads

as shown below.

OFF

COM

705

LOOP CALIBRATOR

SOURCE

SIMULATE

MEASURE

VDC

SpanCheck

Loop Power

Simulate

Press to toggle

Source or Simulate.

Press to step output

up/down in 25 %

steps.

Power

supply

30 V dc

max.

Press to scroll

up/down 0.01 mA.

Hold down to scroll

faster.

For 0.001 mA steps,

see “Pushbutton

Functions.”

Press simultaneously

once for slow ramp

twice for fast ramp

three times for

stepped ramp.

rt05f.eps

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English Instruction Sheet

Page 7

Auto Ramping the mA Output

Auto ramping allows you to continuously apply a varying current

stimulus from the calibrator to a passive (sourcing) or active

(simulate) loop while your hands remain free to test the

transmitter’s response. The calibrator produces a continuously

repeating ramp in your choice of three waveforms:

•E0 % - 100 % - 0 % 40-second smooth ramp

•O0 % - 100 % - 0 % 15-second smooth ramp

•N0 % - 100 % - 0 % Stair-step ramp in 25 % steps,

pausing 5 seconds at each step.

To exit ramping, press any button or turn the calibrator off.

Using the SpanCheckFunction

The SpanCheck™function checks the zero and span points of a

transmitter in either Source or Simulate mode. To exit the

SpanCheck function, press the SOURCE SIM MEAS key or the

25% key.

OFF

COM

705 LOOP CALIBRATOR

SOURCE

SIMULATE

MEASURE

VDC

SpanCheck

Loop Power

Two-wire

transmitter

Press simultaneously

to enter SpanCheck

mode and start at

zero (0 %).

Press for span

(100 %).

Press for zero

(0 %).

rt02f.eps

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English Instruction Sheet

Page 8

Changing the Current Span

The calibrator’s current output span has two settings:

•4 mA = 0 %, 20 mA = 100 % (default)

•0 mA = 0 %, 20 mA = 100 % (optional)

To change and save the current output span in a nonvolatile

memory (retained when the power is turned off), press Uwhile

turning on the calibrator to mA.

Measuring dc mA

OFF

COM

705

LOOP CALIBRATOR

SOURCE

SIMULATE

MEASURE

VDC

SpanCheck

Loop Power

Measure

Press so that Measure

is on display.

rt03f.eps

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English Instruction Sheet

Page 9

Measuring dc mA with Loop Power

Loop power provides +24 V to power a transmitter and to read

loop current simultaneously. To exit, turn the calibrator off or

to V.

Two-wire

transmitter

OFF

COM +

705

LOOP CALIBRATOR

SOURCE

SIMULATE

MEASURE

VDC

SpanCheck

Loop Power

Measure

Press and hold while

turning on the calibrator

to mA.

+24 V output

rt06f.eps

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English Instruction Sheet

Page 10

Measuring dc Volts

OFF

COM

705

LOOP CALIBRATOR

SOURCE

SIMULATE

MEASURE

VDC

SpanCheck

Loop Power

Measure

rt01f.eps

Maintenance WWarning

To avoid electric shock or personal injury:

•Do not allow water into the case.

•Remove any input signals prior to removing test

leads and opening case.

•When servicing the calibrator, use only specified

replacement parts.

For maintenance procedures not described in this sheet, contact

a Fluke Service Center.

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