Fluke 705 User manual
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
© 1998-2003 Fluke Corporation, All rights reserved.
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
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
D
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
mA
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.
or
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
mA
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.
or
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 SpanCheckFunction
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
mA
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
mA
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
mA
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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