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 24 V dc output N/A

output

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

© 1998-2003 Fluke Corporation, All rights reserved.
All product names are trademarks of their respective companies
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W Warning
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

J Earth ground

M Battery

W Refer to this instruction sheet for information about

this feature.

T Double insulated

Conforms to relevant Canadian Standards

Association directives.

P Conforms to European Union directives

Direct current
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Pushbutton Functions
Button Function

M
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.

M+P
Press simultaneously to start the SpanCheck
function. The S symbol appears in the
display. Output toggles between 0 % and 100 %.

P Press to manually step the output up or down 25

%.

D+U ramp output. The

display.
EON
Press both buttons simultaneously to select auto
symbols appear in the

D or U Press to scroll the display up or down.

D Press while turning on the calibrator to change and

save scroll steps to 0.001 mA.

U 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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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.

or
Source 705 LOOP CALIBRATOR

Press to scroll
up/down 0.01 mA.
Hold down to scroll
faster.
Press to step output
For 0.001 mA steps,
up/down in 25 %
see “Pushbutton
steps.
Functions.”

OFF MEASURE
SOURCE
SIMULATE VDC
Loop Power
SpanCheck mA
Press to toggle Press simultaneously
COM +
Source or Simulate. once for slow ramp
twice for fast ramp
three times for
stepped ramp.

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How to Contact Fluke

To order accessories, receive operating assistance, or get the
location of the nearest Fluke distributor or Service Center, call:
1-888-99-FLUKE (1-888-993-5853) in U.S.A.
1-800-36-FLUKE (1-800-363-5853) in Canada
+31-402-675-200 in Europe
+81-3-3434-0181 Japan
+65-738-5655 Singapore
+1-425-446-5500 from other countries
Address correspondence to:
Fluke Corporation Fluke Europe B.V.
P.O. Box 9090, P.O. Box 1186,
Everett, WA 98206-9090 5602 BD Eindhoven
U.S.A. The Netherlands
Visit us on the World Wide Web at: www.fluke.com
Register your Calibrator at: register.fluke.com

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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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.

or
Simulate
705 LOOP CALIBRATOR
Press to scroll
up/down 0.01 mA.
Hold down to scroll
faster.
Press to step output
For 0.001 mA steps,
up/down in 25 %
see “Pushbutton
steps.
Functions.”

OFF MEASURE
SOURCE
SIMULATE VDC
mA Loop Power
Press simultaneously
Press to toggle SpanCheck

+ once for slow ramp

Source or Simulate. COM

twice for fast ramp

three times for
stepped ramp.

30 V dc Power
max. supply

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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:
• E 0 % - 100 % - 0 % 40-second smooth ramp
• O 0 % - 100 % - 0 % 15-second smooth ramp
• N 0 % - 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.

705 LOOP CALIBRATOR

Press simultaneously
to enter SpanCheck
mode and start at
zero (0 %).
Press for span
(100 %).
Press for zero OFF MEASURE
SOURCE
(0 %). SIMULATE
SpanCheck mA
VDC
Loop Power

COM +

Two-wire
transmitter

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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 U while
turning on the calibrator to mA.

Measuring dc mA

705 LOOP CALIBRATOR

Measure

Press so that Measure

is on display.

OFF MEASURE
SOURCE
SIMULATE VDC
Loop Power
SpanCheck mA

COM +

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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.

705 LOOP CALIBRATOR

Measure

Press and hold while

turning on the calibrator
to mA.
OFF MEASURE
SOURCE
SIMULATE VDC
SpanCheck mA Loop Power
+24 V output
COM +

Two-wire
transmitter

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Measuring dc Volts

705 LOOP CALIBRATOR

Measure

OFF MEASURE
SOURCE
SIMULATE VDC
Loop Power
SpanCheck

COM +

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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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In Case of Difficulty
Check the battery and test leads. Replace as needed.
If the calibrator needs repair, contact a Fluke Service Center. If
the calibrator is under warranty, see the warranty statement for
terms. If the warranty has lapsed, the calibrator will be repaired
and returned for a fixed fee.

Cleaning
Periodically wipe the case with a damp cloth and detergent; do
not use abrasives or solvents.

Calibration
Calibrate your calibrator once a year to ensure that it performs
according to its specifications. Call 1-800-526-4731 from the
USA and Canada. In other countries, contact a Fluke Service
Center.
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Replacing the Battery

WWarning
To avoid false readings, which could lead to possible
electric shock or personal injury, replace the battery
as soon as the battery indicator (M) appears in the
display.

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Replacement Parts and Accessories

Replacement Parts
PN or
Item Description Model No. Qty.

BT1 9 V battery, ANSI/NEDA 614487 1

1604A or IEC 6LR61

C10 Holster, Yellow C10 1

MP85 Case top 665098 1

MP86 Case bottom 665109 1

H2 Case screw 832246 4

MP89 Non-skid foot 885884 1

MP92 Battery door 665106 1

S1 Keypad 665117 1

TL75 Test lead set TL75 1

- CD ROM 2088974 1

AC72 Alligator clips AC72 1

TL20 Industrial test lead\ set TL20 Option

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MP85

S1

MP86

MP89
BT1

H2
MP92

CD-ROM

AC72
Alligator Clips

TL75
Test Lead Set

C10

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Specifications
Specifications are based on a one year calibration cycle and
apply from +18 °C to +28 °C unless stated otherwise. “Counts”
means number of increments or decrements of the least
significant digit.

DC Volts Input
Range: + 28 V (+ 30 V max)
Input Impedance: 1 MΩ
Accuracy: ± (0.025 % of reading + 2 counts)

DC mA Input
Range: 24 mA
Resolution: 0.001 mA
Accuracy: ± (0.02 % of reading + 2 counts)

DC mA Output
Range: 0 mA to 24 mA
Accuracy: ± (0.02 % of reading + 2 counts)
Source mode:
Compliance: ≥ 1000 Ω at 20 mA
Simulate mode:

External loop voltage requirement: 24 V nominal, 30 V maximum,

12 V minimum
Loop Power
≥ 24 V

Percent display
-25 % to 125 %

Input/Output Protection
Input/output protection on mA range: resettable, nonreplaceable
0.1 A fuse.
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General Specifications
Maximum voltage applied between any terminal and earth
ground or between any two terminals: 30 V
Storage temperature: -40 °C to 60 °C
Operating temperature: -10 °C to 55 °C
Operating altitude: 3000 meters maximum
Temperature coefficient: ±0.005 % of range per °C for the
temperature ranges -10 to 18 °C and 28 to 55 °C
Relative humidity: 95 % up to 30 °C, 75 % up to 40 °C, 45 % up
to 50 °C, and 35 % up to 55 °C
Vibration: Random 2 g, 5 to 500 Hz
Shock: 1 meter drop test
Safety: Certified as compliant to CAN/CSA C22.2 No.
1010.1:1992. Complies with ANSI/ISA S82.01-1994.
Power requirements: Single 9 V battery (ANSI/NEDA 1604A or
IEC 6LR61)
Battery life (typical): Source mode: 18 hours; 12 mA into
500 Ω; measure/simulate Mode: 50 hours
Size: 32 mm H x 87 mm W x 187 mm L (1.25 in H x 3.41 in W x
7.35 in L);
With holster and Flex-Stand: 52 mm H x 98 mm W x 201 mm L
(2.06 in H x 3.86 in W x 7.93 in L)
Weight: 224 g (8 oz);
With holster and Flex-Stand: 349 g (12.3 oz)