Fluke 726 Operating Manual
726
Multifunction Process Calibrator
®
September 2005
© 2005 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies.
Users Manual
LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is three years and
begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user
customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered,
neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in
accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will
be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different
warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable
international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted
for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is
returned to a Fluke authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service
center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty
repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse,
contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product’s specified
rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work.
Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB
Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR
THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the
limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.
11/99
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
Table of Contents
Title Page
Introduction.................................................................................................................... 1
Contacting Fluke............................................................................................................ 1
Standard Equipment...................................................................................................... 3
Safety Information ......................................................................................................... 3
Symbols.................................................................................................................... 7
Getting Acquainted with the Calibrator.......................................................................... 8
Input and Output Terminals ...................................................................................... 8
Keys.......................................................................................................................... 10
Display...................................................................................................................... 13
Configuration Menus ..................................................................................................... 14
Contrast Adjustment ................................................................................................. 14
Shut Down Mode ...................................................................................................... 15
CJC........................................................................................................................... 15
Celcius and Fahrenheit (°C and °F).......................................................................... 15
Frequency Pulse Output Voltage.............................................................................. 15
Pulse Output Frequency........................................................................................... 15
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HART Resistor ON/OFF.......................................................................................... 16
Getting Started............................................................................................................... 16
Voltage to Voltage Test............................................................................................. 16
Using Measure Mode..................................................................................................... 18
Measuring Electrical Parameters (Upper Display) .................................................... 18
Current Measurement with Loop Power.................................................................... 18
Measuring Electrical Parameters (Lower Display) .................................................... 20
Measuring Temperature............................................................................................ 21
Using Thermocouples........................................................................................... 21
Using Resistance-Temperature Detectors (RTDs)............................................... 24
PRT Custom Curves ................................................................................................. 24
Measuring Pressure .................................................................................................. 27
Zeroing with Absolute Pressure Modules.................................................................. 28
Using Source Mode........................................................................................................ 30
Sourcing 4 to 20 mA.................................................................................................. 30
Simulating a 4- to 20-mA Transmitter........................................................................ 30
Sourcing Other Electrical Parameters....................................................................... 32
Simulating Thermocouples........................................................................................ 34
Simulating RTDs ....................................................................................................... 36
Sourcing Pressure..................................................................................................... 38
Setting 0 % and 100 % Output Parameters ................................................................... 41
% Error Functionality................................................................................................. 41
Stepping and Ramping the Output................................................................................. 41
Manually Stepping the mA Output............................................................................. 42
Auto Ramping the Output.......................................................................................... 42
Storing and Recalling Setups......................................................................................... 42
Store a Setup ............................................................................................................ 42
Recall a Setup........................................................................................................... 43
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Contents
Storing and Recalling Data............................................................................................ 43
Storing Data.............................................................................................................. 43
Recall Data ............................................................................................................... 44
Pulse Train Source/Read .............................................................................................. 44
Calibrating a Transmitter ............................................................................................... 45
Calibrating a Pressure Transmitter................................................................................ 47
Calibrating an I/P Device............................................................................................... 49
Pressure Switch Test..................................................................................................... 51
Testing an Output Device.............................................................................................. 51
Remote Control Commands .......................................................................................... 52
HART Functionality...................................................................................................... 52
Maintenance.................................................................................................................. 53
Replacing the Batteries............................................................................................. 53
Cleaning the Calibrator............................................................................................. 54
Service Center Calibration or Repair ........................................................................ 54
Replacement Parts ................................................................................................... 54
Accessories ................................................................................................................... 56
External Fluke Pressure Module Compatibility......................................................... 56
Specifications ................................................................................................................ 59
DC Voltage Measurement and Source ..................................................................... 59
DC mA Measurement and Source............................................................................ 59
Ohms Measurement ................................................................................................. 60
Ohms Source............................................................................................................ 60
Frequency Measurement.......................................................................................... 60
Frequency Source .................................................................................................... 61
Temperature, Thermocouples .................................................................................. 61
RTD Accuracy (Read and Source) (ITS-90) ............................................................. 63
(continued)
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Index
Loop Power Supply ................................................................................................... 64
Pulse Read and Pulse Source .................................................................................. 64
Pressure Measurement............................................................................................. 64
General Specifications .............................................................................................. 65
iv
List of Tables
Table Title Page
1. Summary of Source and Measure Functions ....................................................................... 2
2. International Symbols ........................................................................................................... 7
3. Input/Output Terminals and Connectors............................................................................... 9
4. Key Functions....................................................................................................................... 11
5. Thermocouple Types Accepted............................................................................................ 22
6. RTD Types Accepted............................................................................................................ 25
7. mA Step Values.................................................................................................................... 42
8. Replacement Parts ............................................................................................................... 54
9. Fluke Pressure Module Compatibility ................................................................................... 56
10. Pressure Modules................................................................................................................. 57
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vi
List of Figures
Figure Title Page
1. Standard Equipment............................................................................................................. 6
2. Input/Output Terminals and Connectors............................................................................... 8
3. Keys...................................................................................................................................... 10
4. Elements of a Typical Display .............................................................................................. 13
5. Adjusting the Contrast .......................................................................................................... 14
6. Voltage-to-Voltage Test........................................................................................................ 17
7. Measuring Voltage and Current Output................................................................................ 18
8. Connections for Supplying Loop Power................................................................................ 19
9. Measuring Electrical Parameters.......................................................................................... 20
10. Measuring Temperature with a Thermocouple..................................................................... 23
11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance................ 26
12. Gage and Differential Pressure Modules.............................................................................. 27
13. Connections for Measuring Pressure ................................................................................... 29
14. Connections for Simulating a 4- to 20-mA Transmitter......................................................... 31
15. Electrical Sourcing Connections........................................................................................... 33
16. Connections for Simulating a Thermocouple........................................................................ 35
17. Connection for Simulating a 3- and 4-Wire RTD .................................................................. 37
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18. Connections for Sourcing Pressure ...................................................................................... 40
19. SAVE DATA Menu Showing Measurement Memory Location 3, 1....................................... 44
20. Calibrating a Thermocouple Transmitter............................................................................... 46
21. Calibrating a Pressure-to-Current (P/I) Transmitter .............................................................. 48
22. Calibrating a Current-to-Pressure (I/P) Transmitter .............................................................. 50
23. Calibrating a Chart Recorder ................................................................................................ 52
24. Replacing the Batteries ......................................................................................................... 53
25. Replacement Parts................................................................................................................ 55
viii
Multifunction Process Calibrator
Introduction
The Fluke 726 Multifunction Process Calibrator (referred
to as “the Calibrator”) is a handheld, battery-operated
instrument that measures and sources electrical and
physical parameters. See Table 1.
In addition to the functions in Table 1, the Calibrator also
has the following features and functions:
• A split-screen display. The upper display allows
users to measure volts, current, and pressure only.
The lower display allows the user to measure and
source volts, current, pressure, resistance
temperature detectors, thermocouples, frequency,
and ohms.
• A thermocouple (TC) input/output terminal and
internal isothermal block with automatic referencejunction temperature compensation.
• Stores and recalls setups.
• Manual and automatic stepping and ramping.
• Stores and recalls calibration screens.
• Control the Calibrator remotely from a PC running a
terminal emulator program.
Contacting Fluke
To order accessories, receive operating assistance, or
locate the nearest Fluke distributor or Service Center,
call:
USA: 1-888-44-FLUKE (1-888-443-5853)
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
USA Service: 1-888-99-FLUKE (1-888-993-5853)
Or, visit Fluke's Web site at www.fluke.com
To register your product, visit register.fluke.com
.
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Table 1. Summary of Source and Measure Functions
Function Measure Source
dc V 0 V to 30 V 0 V to 20 V
dc mA 0 to 24 mA 0 to 24 mA
Frequency 2 CPM to 15 kHz 2 CPM to 15 kHz
Resistance 0 Ω to 4000 Ω 5 Ω to 4000 Ω
Thermocouple Types E, J, K, T, B, R, S, L, U, N, C, XK, BP
RTD
(ResistanceTemperature
Detector)
Pressure 29 modules ranging from 1.0 in. H2O to 10,000 psi
Pulse 1-100,000
Freqency Max 10 kHz
Other functions Loop supply, HART resistor, pressure switch test, save screen, step, ramp, memory, cold
junction compensation
Pt100 Ω (385)
Pt100 Ω (3926)
Pt100 Ω (3916)
Pt200 Ω (385)
Pt500 Ω (385)
Pt1000 Ω (385)
Ni120 (672)
CU10
1-10,000
Frequency Range 2 CPM to 10 kHz
2
Multifunction Process Calibrator
Standard Equipment
Standard Equipment
If the Calibrator is damaged or something is missing,
contact the place of purchase immediately. To order
replacement parts, see Table 8. The items listed below
and shown in Figure 1 are included with the Calibrator.
• TL75 test leads
• AC72 alligator clips
• Stackable alligator clip test leads
726 Product Overview
•
•
725/726 CD-ROM
shown in Figure 1)
• 4 AA Batteries (installed)
(not shown in Figure 1)
(contains Users Manual; not
Safety Information
The Calibrator is designed in accordance with CAN/CSAC22.2 NO. 61010-1-04, UL 61010-1, and ISA 82.02.01
XW Warning
To avoid possible electric shock or personal
injury, use the Calibrator only as specified in
this manual, 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.
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XW Warning
To avoid possible electric shock or personal injury:
• Use the Calibrator only as described in the Users Manual or the protection provided by the Calibrator
may be impaired.
• Do not apply more than the rated voltage, as marked on the Calibrator, between the terminals, or
between any terminal and earth ground (30 V 24 mA max all terminals).
• Before each use, verify the Calibrator’s operation by measuring a known voltage.
• Follow all equipment safety procedures.
• Use the proper terminals, mode, and range for the measuring or sourcing application.
• Never touch the probe to a voltage source when the test leads are plugged into the current terminals.
• Do not use the Calibrator if it is damaged. Before using the Calibrator, inspect the case. Look for cracks
or missing plastic. Pay particular attention to the insulation surrounding the connectors.
• Select the proper function and range for the measurement.
• Make sure the battery door is closed and latched before operating the Calibrator.
• Remove test leads from the Calibrator before opening the battery door.
• Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Replace
damaged test leads before using the Calibrator.
• When using the probes, keep your fingers away from the probe contacts. Keep fingers behind the finger
guards on the probes.
• Connect the common test lead before connecting the live test lead. When disconnecting the test leads,
disconnect the live test lead first.
• Do not use the Calibrator if it operates abnormally. Protection may be impaired. When in doubt, have the
Calibrator serviced.
• Do not operate the Calibrator around explosive gas, vapor, or dust.
4
Multifunction Process Calibrator
Safety Information
• When using a pressure module, make sure the process pressure line is shut off and depressurized
before connecting it or disconnecting it from the pressure module.
• Use only 4 AA batteries, properly installed in the Calibrator case, to power the Calibrator.
• Disconnect test leads before changing to another measure or source function.
• When servicing the Calibrator, use only specified replacement parts.
• 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.
• Turn off circuit power before connecting the Calibrator mA and COM terminals in the circuit. Place
Calibrator in series with the circuit.
• Do not allow water into the case.
WCaution
To avoid possible damage to the Calibrator or to equipment under test:
• Disconnect the power and discharge all high-voltage capacitors before testing resistance or continuity.
• Use the proper input jacks, function, and range for the measurement or sourcing application.
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Alligator Clips
AC72
Test Lead Set
TL75
Stackable
Test Leads
SOURCE / MEASURE
mA
+
3W
mA
-
4W
C
O
N
F
I
G
S
E
L
E
C
T
I
O
N
S
A
V
E
R
E
C
A
L
L
ENTER
TRIGGER/STOP
30V MAX ALL TERMINALS
COM
FREQ
V
RTD
MEASURE
0
2
%
PULSE
EXIT CONFIG
1
0
0
2
5
%
5
%
%
TC
Return to
Recall
V
TC
mA
Hz
RTD
LOOP
COM
6
Figure 1. Standard Equipment
bec01f.eps
Multifunction Process Calibrator
Safety Information
Symbols
Symbols used on the Calibrator and in this manual are explained in Table 2.
Table 2. International Symbols
B
F
J
f
P
)
7
AC - Alternating current
DC - Direct current
Earth ground
Pressure
Conforms to European Union directives
Conforms to Canadian Standards Association directives.
T
M
W
O
X
Double insulated
Battery
Risk of danger. Important information. See
Manual. Precedes Warning.
Power ON/OFF
Hazardous Voltage. Precedes Warning.
726
Users Manual
Getting Acquainted with the Calibrator
Input and Output Terminals
Figure 2 shows the Calibrator input and output terminals.
Table 3 explains their use.
1
PRECISION CALIBRATOR
726
ZERO
HART
V mA
TC
3 Seconds
Return to
Return to
Recall
Recal
OPEN/CLOSE
SWITCH
TEST
FREQ
RTD PULSE
EXIT CONFIG
100%
0%
25%
25%
%Error
V mA
LOOP
MEAS
SOURCE
CONFIG
SELECTION
SAVE
RECALL
ENTER
TRIGGER/STOP
8
2
7
6
5
3
4
bec05f.eps
Figure 2. Input/Output Terminals and Connectors
8
Multifunction Process Calibrator
Getting Acquainted with the Calibrator
Table 3. Input/Output Terminals and Connectors
No Name Description
A
B, C
D
E, F
G, H
Pressure module
connector/serial connector
MEASURE V, mA terminals Input terminals for measuring voltage, current, supplying loop power, HART
Thermocouple (TC)
input/output
SOURCE/ MEASURE V,
RTD, Pulse, Hz, Ω terminals
SOURCE/ MEASURE mA
terminals, 3W, 4W
Connects the Calibrator to a pressure module or to a PC for a remote control
serial connection.
resistance, switch test options.
Terminal for measuring or simulating thermocouples. This terminal accepts a
miniature polarized thermocouple plug with flat, in-line blades spaced 7.9 mm
(0.312 in) center to center.
Terminals for sourcing or measuring voltage, resistance, pulse, frequency, and
RTDs.
Terminals for sourcing and measuring current and performing 3 W and 4 W RTD
measurements. HART resistor option in mA mode.
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Keys
Figure 3 shows the Calibrator keys and Table 4 explains their use.
10
MEAS
SOURCE
CONFIG
SELECTION
SAVE
RECALL
ENTER
TRIGGER/STOP
%Error
V mA
LOOP
V mA
PRECISION CALIBRATOR
726
ZERO
3 Seconds
HART
TC
RTD PULSE
Return to
Recallurn to
Recal
OPEN/CLOSE
SWITCH
TEST
FREQ
EXIT CONFIG
100%
0%
6
7
8
25%
25%
9
10
11
bec41f.eps
PRECISION CALIBRATOR
726
3
20
19
2
ZERO
HART
V mA
TC
3 Seconds
Return to
Recal
OPEN/CLOSE
SWITCH
TEST
FREQ
RTD PULSE
EXIT CONFIG
100%
0%
25%
25%
%Error
V mA
LOOP
MEAS
SOURCE
1
CONFIG
SELECTION
SAVE
RECALL
ENTER
TRIGGER/STOP
4
18
17
5
16
15
14
13
12
Figure 3. Keys
Multifunction Process Calibrator
Getting Acquainted with the Calibrator
Table 4. Key Functions
No Name Description
A O
B
C
%Error
l
ZERO
3 Seconds
A
OPEN/CLOSE
D
Q
E C
F
K
G P
EXIT CONFIG
H
I
J
K
11
G
H
I
J
Turns the power on or off.
Toggles voltage, mA, or Loop Power and % Error measurement functions in the upper display.
Selects the pressure measurement function in the upper display. Repeated pushes cycle through the
different pressure units. Zeros pressure when held for 3 seconds.
Activates the switch test.
Turns backlight on or off.
Selects frequency sourcing or measurement.
Selects pulse sourcing or measurement.
Recalls a source value from memory corresponding to 100 % of span and sets it as the source value.
Press and hold to store the source value as the 100 % value.
Exits Configuration Menu.
Increments output by 25 % of span.
Decrements output by 25 % of span.
Recalls from memory a source value corresponding to 0 % of span and sets it as the source value.
Press and hold to store the source value as the 0 % value.
Press and hold when powering up to identify the firmware version. The firmware version is shown in the
upper display for about 1 second after initialization.
726
Users Manual
Table 4. Key Functions (cont.)
No Name Description
Cycles through :
L
M
N
O
TRIGGER/STOP
L
XW Y Z
Return to
Recall
S
ENTER
C
E Slow repeating 0 % - 100 % - 0 % ramp
P Fast repeating 0 % - 100 % - 0 % ramp
N Repeating 0 % - 100 % - 0 % ramp in 25 % steps
Used for the pulse train and totalizer functions.
Increases or decreases the source level.
Cycles through the 2-, 3-, and 4-wire selections.
Moves through the memory locations of Calibrator setups.
Moves through the configuration menus.
Saves and recalls setups & data.
ENTER is used in the configuration menus.
Used to enter and navigate the configuration menus.
P
M
Q T
R
V
S R
T U
12
HART
Cycles the Calibrator through MEASURE and SOURCE modes in the lower display.
Selects TC (thermocouple) measurement and sourcing function in the lower display. Repeated
pushes cycle through the thermocouple types.
Toggles between voltage, mA sourcing, or mA simulate functions in the lower display.
Inserts a 250 Ω resistor when in mA.
Selects RTD (resistance temperature detector) measurement and sourcing function in lower
display. Repeated pushes cycle through the RTD types. Selects resistance mode.
Selects the pressure measurement and sourcing function. Repeated pushes cycle through the
different pressure units.
Multifunction Process Calibrator
Getting Acquainted with the Calibrator
Display
Figure 4 shows the elements of a typical display.
Loop
Indicator
Memory Locations
for Calibrator Setups
HART Mode
Indicator
Low Battery
Symbol
Units
Mode
Display
Indicator
% Error
Indicators
Auto
Ramp
bec07f.eps
Figure 4. Elements of a Typical Display
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Configuration Menus
Use the configuration menus to set or change these
parameters of the Calibrator:
• Contrast Adjustment
• Shut Down Mode
• CJC on/off
• °C/°F
• Frequency/Pulse output voltage
• Pulse output frequency
• HART resistor on/off
To enter the configuration menus, press C. Press
S, to save new configuration. Press G/
CONFIG
to exit configuration.
Configuration menus are explained below.
Contrast Adjustment
To adjust the contrast (see Figure 5):
1. Press C until Contst Adjust appears on the
display.
2. Use X and W to adjust the contrast up and down.
3. Press S to save the setting.
EXIT
PRECISION CALIBRATOR
726
ZERO
HART
V mA
TC
3 Seconds
Return to
Return to
Recall
Recal
OPEN/CLOSE
SWITCH
RTD PULSE
%Error
V mA
LOOP
MEAS
SOURCE
CONFIG
SELECTION
SAVE
RECALL
ENTER
1
TRIGGER/STOP
3
Figure 5. Adjusting the Contrast
TEST
FREQ
EXIT CONFIG
100%
25%
0%
2
25%
bec06f.eps
14
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