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724-KIT2
User manual
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Fluke 724, 724-KIT2 User manual

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Page 1
724

Temperature Calibrator

Users Manual
®
February 2000 Rev.1, 8/03
© 2000-2003 Fluke Corporation. All rights reserved. All product names are trademarks of their respective companies.
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Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is
LIMITED WARRANTY & LIMITATION OF LIABILITY
three years and begins on the date of s hi pm ent. Parts, product repairs and services are warranted for 90 days. This warrant y extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not appl y to fuses, disposable batt eri es or to any product which, in Fluke’s opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnorm al conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with its f unc tional specifications for 90 days and t hat i t has been properly recorded on non-defective media. Fluk e does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers s hall extend this warranty on new and unused product s to end-user customers only but have no authority to extend a greater or different warranty on behal f of Fluke. Warranty support is av ai lable only if product is purchased t hrough a Fluk e authorized sales outlet or B uyer has paid the applicable international price. Fluke reserves the right to i nvoice Buyer for importation cos t s of repair/replacement parts when product purchased in one country is submi tted for repair in another country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase pri ce, free of charge repair, or replacement of a def ective product which is returned to a Fluke authorized service center withi n the warranty period.
To obtain warranty service, c ontact your nearest Fluke authorized service center to obtain return authorization information, then send t he product to that servic e center, with a description of the di f ficulty, postage and insuranc e prepai d (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the produc t will be ret urned to Buyer, transportation prepaid (FOB Destinatio n). If Fluke determines that failure was c aused by neglect, misuse, c ontamination, alteration, acc i dent or abnorm al condition of operation or handling, including overvoltage fail ures caused by use outside the product’s specified rating, or normal wear and t ear of mechanical components, Fluke will provide an estimate of repair cost s and obtain authorization before commencing the work. Following repair, t he product will be returned to the Buyer transportati on prepaid and t he 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 B UT 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 limitat i on of the term of an implied warranty, or ex clusion or limitation of inc i dent al or consequential damages, the l i m i tations and exclusions of t hi s warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other decis ion-mak er of competent jurisdiction, such holding will not aff ect the validity or enforceability of any other provision.
11/99
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Table of Contents

Title Page
Introduction....................................................................................................................1
Contacting Fluke............................................................................................................ 1
Standard Equipment...................................................................................................... 3
Safety Information.......................................................................................................... 3
Getting Acquainted with the Calibrator.......................................................................... 8
Input and Output Terminals ...................................................................................... 8
Keys.......................................................................................................................... 10
Display...................................................................................................................... 13
Getting Started .............................................................................................................. 14
Shut Down Mode........................................................................................................... 14
Contrast Adjustment...................................................................................................... 16
Using Measure Mode..................................................................................................... 17
Measuring Electrical Parameters (Upper Display).................................................... 17
Current Measurement with Loop Power.................................................................... 17
Measuring Electrical Parameters (Lower Display).................................................... 19
Measuring Temperature............................................................................................ 20
Using Thermocouples.......................................................................................... 20
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Using Resistance-Temperature Detectors (RTDs)............................................... 23
Using Source Mode........................................................................................................ 26
Sourcing Electrical Parameters................................................................................. 26
Simulating Thermocouples........................................................................................ 27
Simulating RTDs........................................................................................................ 27
Setting 0 % and 100 % Output Parameters................................................................... 30
Stepping and Ramping the Output................................................................................. 30
Manually Stepping the Output................................................................................... 30
Auto Ramping the Output.......................................................................................... 31
Storing and Recalling Setups ......................................................................................... 31
Calibrating a Transmitter................................................................................................ 32
Testing an Output Device............................................................................................... 34
Replacing the Batteries.................................................................................................. 35
Replacing the Fuse........................................................................................................ 35
Maintenance................................................................................................................... 36
Cleaning the Calibrator.............................................................................................. 36
Service Center Calibration or Repair......................................................................... 36
Replacement Parts.................................................................................................... 37
Specifications................................................................................................................. 39
DC Voltage Measurement......................................................................................... 39
DC Voltage Source.................................................................................................... 39
DC mA Measurement................................................................................................ 39
Ohms Measurement.................................................................................................. 40
Ohms Source............................................................................................................. 40
Millivolt Measurement and Source*........................................................................... 41
Temperature, Thermocouples................................................................................... 41
Temperature, RTD Ranges, and Accuracies (ITS-90)............................................... 42
Loop Power Supply................................................................................................... 43
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Temperature Calibrator
Contents
General Specifications.............................................................................................. 43
Index ....................................................................................................................................... 45
(continued)
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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............................................................................................ 21
6. RTD Types Accepted............................................................................................................24
7. Replacement Parts............................................................................................................... 37
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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. Voltage-to-Voltage Test........................................................................................................ 15
6. Adjusting the Contrast .......................................................................................................... 16
7. Measuring Voltage and Current Output................................................................................ 17
8. Connections for Supplying Loop Power................................................................................ 18
9. Measuring Electrical Parameters.......................................................................................... 19
10. Measuring Temperature with a Thermocouple..................................................................... 22
11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance................ 25
12. Electrical Sourcing Connections........................................................................................... 26
13. Connections for Simulating a Thermocouple........................................................................ 28
14. Connection for Simulating a 3-Wire RTD.............................................................................. 29
15. Calibrating a Thermocouple Transmitter............................................................................... 33
16. Calibrating a Chart Recorder................................................................................................ 34
17. Replacing the Batteries......................................................................................................... 36
18. Replacement Parts............................................................................................................... 38
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Introduction

Your Fluke 724 Temperature Calibrator is a handheld, battery-operated instrument that measures and sources a variety of thermocouples and RTDs. See Table 1.
In addition to the functions in Table 1, the calibrator has the following features and functions:
• A split-screen display. The upper display allows you to measure volts and current. The lower display allows you to measure and source volts, resistance temperature detectors, thermocouples, and ohms.
• A thermocouple (TC) input/output terminal and internal isothermal block with automatic reference­junction temperature compensation.
• Storage and recall of 8 setups.
• Manual stepping and automatic stepping and
ramping.

Temperature Calibrator

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Users Manual
Table 1. Summary of Source and Measure Functions
Function Measure Source
dc V 0 V to30 V 0 V to10 V Resistance 0 Ω to 3200 Ω 15 Ω to 3200 Ω Thermocouple Types E, J, K, T, B, R, S, L, U, N, mV RTD
(Resistance­Temperature Detector)
Other functions Loop supply, Step, Ramp, Memory, Dual display
Pt100 Ω (385) Pt100 Ω (3926) Pt100 Ω (3916) Pt200 Ω (385) Pt500 Ω (385) Pt1000 Ω (385) Ni120
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Temperature Calibrator

Standard Equipment

Standard Equipment
The items listed below and shown in Figure 1 are included with your calibrator. If the calibrator is damaged or something is missing, contact the place of purchase immediately. To order replacement parts or spares, see the user-replaceable parts list in Table 7.
• TL75 test leads (one set)
• Alligator clips (one set)
• Stackable alligator clip test leads (one set)
• 724 Product Overview Manual
• 724 CD-ROM (contains Users Manual)
• Spare fuse

Safety Information

The calibrator is designed in accordance with IEC1010-1, ANSI/ISA S82.01-1994 and CAN/CSA C22.2 No. 1010.1-
92. 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.
International symbols used on the calibrator and in this manual are explained in Table 2.
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Users Manual
W Warning
To avoid possible electric shock or personal injury:
• Do not apply more than the rated voltage, as marked on the calibrator, between the terminals, or
between any terminal and earth ground. Maximum for all terminals is 30 V, 24 mA.
• Before each use, verify the calibrator’s operation by measuring a known voltage.
• Follow all equipment safety procedures.
• 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 you use 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 your measurement.
• 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.
• Inspect the test leads for damaged insulation or exposed metal. Check test leads continuity. Replace
damaged test leads before you use the calibrator.
• When using the probes, keep your fingers away from the probe contacts. Keep your fingers behind the
finger guards on the probes.
• Connect the common test lead before you connect the live test lead. When you disconnect 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.
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Temperature Calibrator
Safety Information
W Warning
• 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
batteries as soon as the battery indicator (M) appears.
Caution
To avoid possible damage to calibrator or to equipment under test:
• Disconnect the power and discharge all high-voltage capacitors before testing resistance or continuity.
• Use the proper jacks, function, and range for your measurement or sourcing application.
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Alligator Clips
Test Lead Set
TL75
mA
4W
Stackable Test Leads
Figure 1. Standard Equipment
SOURCE / MEASURE
3W
-
STORE SETUP
RECALL
30V MAX ALL TERMINALS
V
RTD
COM
100%
25%
25%
0%
MEASURE
V
TC
mA
LOOP
COM
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Temperature Calibrator
Safety Information
Table 2. International Symbols
AC - Alternating current Double insulated DC - Direct current Battery Earth ground Refer to the manual for information about
this feature.
Pressure Conforms to Canadian Standards
Association directives
O
ON/OFF Conforms to European Union directives
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Getting Acquainted with the Calibrator

Input and Output Terminals

Figure 2 shows the calibrator input and output terminals. Table 3 explains their use.
724
TEMPERATURE CALIBRATOR
LOOP
mA
V
MEAS
SOURCE
STORE
SETUP
RECALL
V
TC
C
˚
RTD
F
˚
100%
25%
25%
0%
1
7
6
5
4
2
3
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Figure 2. Input/Output Terminals and Connectors
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Table 3. Input/Output Terminals and Connectors
No Name Description
Temperature Calibrator
Getting Acquainted with the Calibrator
A, B
C
D, E F, G
MEASURE V, mA terminals
TC input/output Terminal for measuring or simulating thermocouples. This terminal accepts a miniature
SOURCE/ MEASURE V, RTD, Ω terminals
MEASURE 3W, 4W Terminals for performing 3W and 4W RTD measurements.
Input terminals for measuring voltage, current, and supplying loop power.
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, and RTDs.
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Users Manual

Keys

Figure 3 shows the calibrator keys and Table 4 explains their use.
724
TEMPERATURE CALIBRATOR
3
724
TEMPERATURE CALIBRATOR
10
2
4
20
19
18
LOOP
mA
MEAS
SOURCE
STORE
SETUP
RECALL
SOURCE / MEASURE
+
mA 3W
-
mA 4W
V
V
TC RTD
30V MAX ALL TERMINALS
V
TC
RTD
COM COM
C
˚
F
˚
100%
25%
25%
0%
MEASURE
V
mA
LOOP
V
V
TC
RTD
COM COM
C
˚
F
˚
100%
25%
25%
0%
MEASURE
V
mA
LOOP
5
V
MEAS
SOURCE
1
STORE
SETUP
RECALL
SOURCE / MEASURE
+
mA 3W
-
mA 4W
TC RTD
30V MAX ALL TERMINALS
16
14
17
15
13
12
LOOP
mA
6
7
8
9
10
11
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Figure 3. Keys
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Temperature Calibrator
Getting Acquainted with the Calibrator
Table 4. Key Functions
No Name Description
A O Turns the power on or off. B V Selects voltage measurement function in the upper display. C A Selects the mA measurement function in the upper display. D K Activates a 24-volt loop supply while measuring mA. E C Turns backlight on or off. Turns contrast adjust mode on when powering up. F F Displays temperature in degrees Celsius when in TC or RTD functions. G D Displays temperature in degrees Fahrenheit when in TC or RTD functions. H G Recalls from memory a source value corresponding to 100 % of span and sets it as the source value.
Press and hold to store any source value as the 100 % value.
I H Increments output by 25 % of span. J I Decrements output by 25 % of span. K J 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. Identifies Firmware version. Press and hold
J when powering up.
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Table 4. Key Functions (cont.)
No Name Description
L L
AM AMOYOZ
M XW
Y Z
N Q O S P
M
Q T
R V S R
Cycles through :
E
Slow repeating 0 % - 100 % - 0 % ramp
P
Fast repeating 0 % - 100 % - 0 % ramp
N
Repeating 0 % - 100 % - 0 % ramp in 25 % steps
Disables Shut Down Mode Enables Shut Down Mode
Increases or decreases the source lev el. Cycles through the 2-, 3-, and 4-wire selections. Moves through the eight memory locations of calibrator set ups . In Contrast Adjustment mode; up-darkens contrast , down-lightens c ont ras t .
Retrieves a previous calibrator setup from one of eight memory locat ions .
Saves the calibrator setup to one of eight memory locat ions . Sav es Contras t Adjut ment s et up.
Cycles the calibrator through MEASURE and SOURCE modes in th e lower dis play .
Selects TC (thermocouple) measurement and sourcing function in the lower display. Repeated pushes cycle through the thermocouple types.
Toggles between voltage, sourcing, and measuring functions in t he lower display . Selects RTD (resistance temperature detector) measurement and sourcing f unc t ion in lower dis play . Repeated
pushes cycle through the RTD types.
T U Selects the ohms measurement and sourcing function.
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Display

Figure 4 shows the elements of a typical display.
Temperature Calibrator
Getting Acquainted with the Calibrator
Low Battery
Symbol
Mode
Indicator
Loop
Annunciator
Figure 4. Elements of a Typical Display
Memory Locations
for Calibrator Setups
Units Display
Auto Ramp
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Getting Started

This section acquaints you with some basic operations of the calibrator.
Proceed as follows to perform a voltage-to-voltage test:
1. Connect the calibrator’s voltage output to its voltage input as shown in Figure 5.
2. Press O to turn on the calibrator. Press l to select dc voltage (upper display).
3. If necessary, press M for SOURCE mode (lower display). The calibrator is still measuring dc voltage, and you can see the active measurements in the upper display.
4. Press
5. Press
l to select dc voltage sourcing.
Y and Z to select a digit to change. Press X
to select 1 V for the output value. Press and hold
J to enter 1 V as the 0 % value.
6. Press
7. Press H and I to step between 0 and 100 %
X to increase the output to 5 V. Press and
G to enter 5 V as the 100 % value.
hold
in 25 % step increments.

Shut Down Mode

The calibrator comes with the Shut Down mode enabled for a time duration set to 30 minutes (displayed for about 1 second when the calibrator is initially turned on). When the Shut Down mode is enabled, the calibrator will automatically shut down after the time duration has elapsed from the time the last key was pressed. To disable the Shut Down mode, press O and Y simultaneously. To enable the mode, press O and Z simultaneously. To adjust the time duration, press O and Z simultaneously, then press X and/or W to adjust the time between 1 and 30 minutes.
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SETUP
RECALL
MEAS
SOURCE
STORE
V
TC
V
724
TEMPERATURE CALIBRATOR
mA
LOOP
RTD
0%
Temperature Calibrator
Shut Down Mode
C
˚
F
˚
100%
25%
25%
Figure 5. Voltage-to-Voltage Test
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Contrast Adjustment

Note
Available with V2.1 Firmware or greater. To identify firmware version, press and hold J when powering up. The firmware version will be shown in the upper units display for about 1 second after initialization.
724
TEMPERATURE CALIBRATOR
1
To adjust the contrast, proceed as follows:
1. Press C and O until Contst Adjust is displayed as shown in Figure 6.
2. Press and hold X to darken contrast.
3. Press and hold W to lighten contrast.
4. Press S to save the contrast level.
16
LOOP
mA
V
V
MEAS
SOURCE
TC RTD
STORE
SETUP
RECALL
4
C
˚
F
˚
100%
25%
25%
0%
Figure 6. Adjusting the Contrast
2
3
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Using Measure Mode

Measuring Electrical Parameters (Upper Display)

To measure the current or voltage output of a transmitter, use the upper display and proceed as follows:
1. Press A to select current. LOOP should not be on.
2. Connect the leads as shown in Figure 7.

Current Measurement with Loop Power

The loop power function activates a 24 V supply in series with the current measuring circuit, allowing you to test a
transmitter when it is disconnected from plant wiring. To measure current with loop power, proceed as follows:
1. Connect the calibrator to the transmitter current loop terminals as shown in Figure 8.
2. Press K while the calibrator is in current measurement mode. LOOP appears and an internal 24 V loop supply turns on.
MEAS
SOURCE
STORE SETUP
RECALL
724
V
V
TC RTD
TEMPERATURE CALIBRATOR
LOOP
mA
Temperature Calibrator
Using Measure Mode
C
˚
F
˚
100%
25%
25%
0%
Black
Red
Figure 7. Measuring Voltage and Current Output
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Users Manual
MEAS
SOURCE
STORE
SETUP
RECALL
724
V
V
TC RTD
TEMPERATURE CALIBRATOR
LOOP
mA
Red
C
˚
F
˚
100%
25%
25%
0%
TEST DC PWR
+ –+–
–+
Black
Figure 8. Connections for Supplying Loop Power
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Measuring Electrical Parameters (Lower Display)

To measure the electrical parameters using the lower display, proceed as follows:
1. Connect the calibrator as shown in Figure 9.
Temperature Calibrator
Using Measure Mode
724
TEMPERATURE CALIBRATOR
2. If necessary, press display)
3. Press
l for dc voltage or current, or U for
resistance.
M for MEASURE mode (lower
LOOP
mA
V
MEAS
SOURCE
STORE
SETUP
RECALL
V
TC RTD
C
˚
F
˚
100%
25%
25%
0%
Figure 9. Measuring Electrical Parameters
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Measuring Temperature

Using Thermocouples
The calibrator supports ten standard thermocouples, including types E, N, J, K, T, B, R, S, L, or U. Table 5 summarizes the ranges and characteristics of the supported thermocouples.
To measure temperature using a thermocouple, proceed as follows:
1. Attach the thermocouple leads to the appropriate TC miniplug, then to the TC input/output as shown in Figure 10.
Note
One pin is wider than the other. Do not try to force a miniplug in the wrong polarization.
If the calibrator and the thermocouple plug are at
different temperatures, wait one minute or more for the connector temperature to stabilize after you plug the miniplug into the TC input/output.
2. If necessary, press
3. Press T for the TC display. If desired, continue pressing this key to select the desired thermocouple type.
If necessary, you can select °C temperature units by pressing
F, or °F temperature units by pressing
M for MEASURE mode.
D.
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Temperature Calibrator
Using Measure Mode
Table 5. Thermocouple Types Accepted
Positive Lead (H)
Type Positive Lead
Material
E Chromel Purple Violet Constantan -200 to 950 N Ni-Cr-Si Orange Pink Ni-Si-Mg -200 to 1300
J Iron White Black Constantan -200 to 1200 K Chromel Yellow Green Alumel -200 to 1370 T Copper Blue Brown Constantan -200 to 400 B Platinum (30 % Rhodium) Gray Platinum (6 % Rhodium) 600 to 1800 R Platinum (13 % Rhodium) Black Orange Platinum -20 to 1750 S Platinum (10 % Rhodium) Black Orange Platinum -20 to 1750 L Iron Constantan -200 to 900 U Copper Constantan -200 to 400
*American National Standards Institute (ANSI) device negative lead (L) is always red. **International Electrotechnical Commission (IEC) device negative lead (L) is always white.
Color Negative Lead Specified Range
ANSI* IEC**
Material (°C)
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SOURCE / MEASURE
3W
4W
30V MAX ALL TERMINALS
V
TC
TC
mA
LOOP
RTD
COM COM
MEASURE
V
Process Temperature
Warning
22
TC Miniplug
30 V maximum to
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Figure 10. Measuring Temperature with a Thermocouple
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Temperature Calibrator
Using Measure Mode
Using Resistance-Temperature Detectors (RTDs)
The calibrator accepts RTD types shown in Table 6. RTDs are characterized by their resistance at 0 °C (32 °F), which is called the “ice point” or R is 100 Ω. The calibrator accepts RTD measurement inputs in two-, three-, or four-wire connections, with the three-wire connection the most common. A four-wire configuration provides the highest measurement precision, and two-wire provides the lowest measurement precision.
. The most common R
0
To measure temperature using an RTD input, proceed as follows:
1. If necessary, press
0
2. Press
3. Press
4. Attach the RTD to input terminals as shown in
R for the RTD display. If desired, continue
pressing this key to select the desired RTD type.
X or W to select a 2-, 3-, or 4- wire
connection.
Figure 11. If necessary, you can select °C temperature units by
pressing
F, or °F temperature units by pressing
M for MEASURE mode.
D
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Table 6. RTD Types Accepted
RTD Type Ice Point (R
Pt100 (3926) 100 Ω Platinum 0.003926 Ω/°C -200 to 630 Pt100 (385) 100 Ω Platinum 0.00385 Ω/°C -200 to 800 Ni120 (672) 120 Ω Nickel 0.00672 Ω/°C -80 to 260 Pt200 (385) 200 Ω Platinum 0.00385 Ω/°C -200 to 630 Pt500 (385) 500 Ω Platinum 0.00385 Ω/°C -200 to 630 Pt1000 (385) 1000 Ω Platinum 0.00385 Ω/°C -200 to 630 Pt100 (3916) 100 Ω Platinum 0.003916 Ω/°C -200 to 630
The Pt100 commonly used in U.S. industrial applications is Pt100 (3916), α = 0.003916 Ω/°C. (Also designated as JIS curve.) The IEC standard RTD is the Pt100 (385), α = 0.00385 Ω/°C.
) Material α Range (°C)
0
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2W
3W
4W
SOURCE / MEASURE
3W
4W
SOURCE / MEASURE
3W
4W
SOURCE / MEASURE
3W
4W
30V MAX ALL TERMINALS
V
TC
RTD
COM COM
30V MAX ALL TERMINALS
V
TC
RTD
COM COM
30V MAX ALL TERMINALS
V
TC
RTD
COM COM
mA
LOOP
mA
LOOP
mA
LOOP
MEASURE
V
MEASURE
V
MEASURE
V
Temperature Calibrator
Using Measure Mode
RTD
RTD
RTD
Resistance to be measured
Resistance to be measured
Resistance to be measured
Figure 11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance
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Using Source Mode

In SOURCE mode, the calibrator generates calibrated signals for testing and calibrating process instruments, supplies voltages and resistances, and simulates the electrical output of RTD and thermocouple temperature sensors.

Sourcing Electrical Parameters

Volts or ohms are sourced and shown in the lower display.
V
Red
+
–
Black
Figure 12. Electrical Sourcing Connections
To select an electrical sourcing function, proceed as follows:
1. Connect the test leads as shown in Figure 12, depending on the source function.
2. If necessary, press
3. Press
V for dc voltage, or U for resistance.
4. Enter the desired output value by pressing
Mfor SOURCE mode.
X and
W keys. Press Y and Z to select a different digit to
change.
30V MAX ALL TERMINALS
SOURCE / MEASURE
3W
4W
V RTD
COM COM
V
TC
mA
LOOP
Common
MEASURE
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Temperature Calibrator
Using Source Mode

Simulating Thermocouples

Connect the calibrator TC input/output to the instrument under test with thermocouple wire and the appropriate thermocouple mini-connector (polarized thermocouple plug with flat, in-line blades spaced 7.9 mm [0.312 in] center to center).
Note
One pin is wider than the other. Do not try to force a miniplug in the wrong polarization. Figure 13 shows this connection.
Proceed as follows to simulate a thermocouple:
1. Attach the thermocouple leads to the appropriate TC miniplug, then to the TC input/output as shown in Figure 13.
2. If necessary, press
3. Press
4. Enter the temperature you want by pressing
T for the TC display. If desired, continue
pressing this key to select the desired thermocouple type.
M for SOURCE mode.
X and
W keys. Press Y and Z to select a different digit to
edit.

Simulating RTDs

Connect the calibrator to the instrument under test as shown in Figure 14. Proceed as follows to simulate an RTD:
1. If necessary, press
2. Press
R for the RTD display.
M for SOURCE mode.
Note
Use the 3W and 4W terminals for measurement
only, not for simulation. The calibrator simulates a 2-wire RTD at its front panel. To connect to a 3-wire or 4-wire transmitter, use the stacking cables to provide the extra wires. See Figure 14.
3. Enter the temperature you want by pressing
W keys. Press Y and Z to select a different digit to
edit.
4. If the 724 display indicates ExI HI the excitation current from your device under test exceeds the limits of the 724.
X and
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724
Users Manual
MEAS
SOURCE
STORE SETUP
RECALL
724
V
V
TC RTD
TEMPERATURE CALIBRATOR
LOOP
mA
TC
TEST DC PWR
Color depends
++–
on type of TC
C
˚
F
˚
100%
25%
25%
0%
–+
TC Miniplug
Figure 13. Connections for Simulating a Thermocouple
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RECALL
SOURCE
STORE SETUP
Temperature Calibrator
Using Source Mode
SENSOR TERMINALS
724
TEMPERATURE CALIBRATOR
1
4 3
2
V
mA
LOOP
MEAS
V
TC
C
˚
RTD
F
˚
100%
25%
25%
0%
BLACK
RED
BLACK
Figure 14. Connections for Simulating 3-Wire RTD
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724
Users Manual

Setting 0 % and 100 % Output Parameters

For output parameters (volts, ohms, TC potentials or RTD resistances), you must set the 0 % and 100 % points before you can use the step and ramp functions. Proceed as follows:
1. If necessary, press
2. Select the TC source function and use the arrow keys to enter the value. Our example is thermocouple source using 100 °C and 300 °C values for source.
3. Enter 100 °C and press and hold value.
4. Enter in 300 °C and press and hold value.
You can now use this setting for the following:
• Manually stepping an output with 25 % increments.
• Jump between the 0 and 100 % span points by
momentarily pushing
M for SOURCE mode.
J to store the
G to store the
J or G.

Stepping and Ramping the Output

Two features are available for adjusting the value of source functions.
• Stepping the output manually with the keys, or in automatic mode.
• Ramping the output.
Stepping and ramping apply to all functions.

Manually Stepping the Output

To manually step the output you can do the following:
• Use
• Touch momentarily either
H or I to step the output up or down in
25 % steps.
J to go to 0 %, or G
to go to 100 %.
H and I
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Temperature Calibrator

Storing and Recalling Setups

Auto Ramping the Output

Auto ramping gives you the ability to continuously apply a varying stimulus from the calibrator to a transmitter, while your hands remain free to test the response of the transmitter.
When you press continuously repeating 0 % - 100 % - 0 % ramp in your choice of three ramp waveforms:
E 0 % - 100 % - 0 % 40-second smooth ramp
•
• P 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.
L, the calibrator produces a
Storing and Recalling Setups
You can store up to eight of your settings in a nonvolatile memory and recall the settings for later use. A low battery condition or a battery change does not jeopardize the stored settings. Proceed as follows:
1. After you create a calibrator setup, press display, the memory locations appear.
2. Press
3. Press
To recall setups, proceed as follows.
1. Press
2. Press
Y or Z to select locations one through eight. An
underscore appears below the selected memory location.
S. Only the stored memory location will be
displayed. The setup is stored.
Q. The memory locations appear on the
display.
Y or Z to select the appropriate location and
Q.
press
S. In the
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724
Users Manual

Calibrating a Transmitter

Use the measurement (upper display) and source (lower display) modes to calibrate a transmitter. The following example shows how to calibrate a temperature transmitter.
Connect the calibrator to the instrument under test as shown in Figure 15. Proceed as follows to calibrate a transmitter:
1. Press
2. Press
3. If necessary, press
K for current measurement with loop power.
T (lower display). If desired, continue
pressing this key to select the desired thermocouple type.
M for SOURCE mode.
4. Set your zero and span parameters by pressing X and W keys. Enter these parameters by pressing and holding setting parameters, see “Setting 0 % and 100 %” earlier in this manual.
5. Perform test checks at 0-25-50-75-100 % points by pressing necessary.
J and G. For more information on
H or I. Adjust the transmitter as
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MEAS
SOURCE
STORE
SETUP
RECALL
724
V
V
TC RTD
TEMPERATURE CALIBRATOR
LOOP
mA
Temperature Calibrator
Calibrating a Transmitter
Red
C
˚
F
˚
100%
25%
25%
0%
Black
TEST DC PWR
+ –+–
–+
Figure 15. Calibrating a Thermocouple Transmitter
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724
Users Manual

Testing an Output Device

Use the source functions to test and calibrate actuators, recording, and indicating devices. Proceed as follows:
1. Connect the test leads to the instrument under test as shown in Figure 16.
2. Press l for dc voltage, or U for resistance (lower display).
3. If necessary, press
M for SOURCE mode.
0 to 1 V dc
Input
Black
Red
MEAS
SOURCE
STORE
SETUP
RECALL
724
V
V
TC RTD
TEMPERATURE CALIBRATOR
LOOP
mA
C
˚
F
˚
100%
25%
25%
0%
Figure 16. Calibrating a Chart Recorder
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Temperature Calibrator

Replacing the Batteries

Replacing the Batteries
WWarning
To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the battery indicator (M) appears.
Figure 17 shows you how to replace the batteries.

Replacing the Fuse

The calibrator comes equipped with one 0.05A, 250V, socketed fuse to protect the calibrator.
WWarning
To avoid electrical shock, remove the test leads from the calibrator before opening the battery door. Close and latch the battery door before using the calibrator.
The fuse can be removed and checked for resistance. A value of < 10 while measuring using the right jacks indicate that F3 may have opened. To replace the fuse, refer to Figure 17 and perform the following steps:
Ω is good. Problems
1. Turn the calibrator off, remove the test leads
from the terminals, and hold the calibrator face
.
down
2. Using a flat-blade screwdriver, turn the battery door screws 1/4-turn counterclockwise and remove the battery door.
3. Remove and replace the damaged fuse.
4. Replace the battery door and secure it by turning the screws 1/4-tu rn clockwise.
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724
Users Manual

Maintenance

Cleaning the Calibrator

W Warning
To avoid personal injury or damage to the calibrator, use only the specified replacement parts and do not allow water into the case.
Caution
To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers.
Battery and
Compartment
36
Fuse Compartment
Figure 17. Replacing the Batteries
sh38f.eps
Clean the calibrator with a soft cloth dampened with water or water and mild soap.

Service Center Calibration or Repair

Calibration, repairs, or servicing not covered in this manual should be performed only by qualified service personnel. If the calibrator fails, check the batteries first, and replace them if needed.
Verify that the calibrator is being operated in accordance with the instructions in this manual. If the calibrator is faulty, send a description of the failure with the calibrator. Be sure to pack the calibrator securely, using the original shipping container if it is available. Send the equipment
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Page 44
Temperature Calibrator
Maintenance
postage paid and insured, to the nearest Service Center. Fluke assumes no responsibility for damage in transit.
The Fluke 724 Temperature Calibrator covered by the warranty will be promptly repaired or replaced (at Fluke’s option) and returned to you at no charge. See the warranty at the beginning of this manual for warranty terms. If the warranty period has expired, the calibrator will be repaired and returned for a fixed fee. If the calibrator is not covered under the warranty terms, contact an authorized service center for a price quote for repair.
To locate an authorized service center, refer to “Contacting Fluke” at the beginning of the manual.

Replacement Parts

Table 7 lists the part number of each replaceable part. Refer to Figure 18.
Table 7. Replacement Parts
Item Description PN Qty.
1 Case top 664232 1 2 LCD mask 1548383 1 3 Elastomeric strips 802063 2 4 Input/output bracket 1549221 1 5 LCD bracket 667287 1
6 Mounting screws 494641 11 7 Backlight 690336 1 8 LCD 690963 1 9 Keypad 1548126 1 10 Case bottom 664235 1 11 AA alkaline batteries 376756 4 12 Case screws 832246 4 13 Battery door 664250 1 14 Accessory mount 658424 1 15 Tilt stand 659026 1 16 Battery door 1/4-turn
fasteners 17 TL75 series test leads 855742 1 18 Test lead, red
Test lead, black 19 724 Product Overview
Manual 20 AC72 alligator clip, red
AC72 alligator clip, black 21 CD-ROM (includes the 724
Users Manual) 22 Top case decal 1548329 1 23 Fuse 0.05A/250V 2002234 1
948609 2
688051 68806611
1547851 1
1670641 167065211
1547849 1
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724
Users Manual
20
19
22
1
21
8
7
3
6
23
Figure 18. Replacement Parts
9
6
17
10
11
2
3
4
5
16
18
12
13
14
15
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Temperature Calibrator

Specifications

Specifications
Specifications are based on a one year calibration cycle and apply from +18 °C to +28 °C unless stated otherwise. All specifications assume a 5 minute warmup period.

DC Voltage Measurement

Accuracy,
Range Resolution
30 V (upper display)
20 V (lower display)
90 mV 0.01 mV 0.02 % + 2
Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ±0.005 % of range per °C
0.001 V 0.02 % + 2
0.001 V 0.02 % + 2
(% of Reading + Counts)

DC Voltage Source

Accuracy,
Range Resolution
100 mV 0.01 mV 0.02 % + 2 10 V 0.001 V 0.02 % + 2
Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ±0.005 % of range per °C
Maximum load: 1 mA
(% of Reading + Counts)

DC mA Measurement

Accuracy,
Range Resolution
24 mA 0.001 mA
Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ±0.005 % of range per °C
Drive capability: 1000 Ω at 20 mA
(% of Reading + Counts)
0.02 % + 2
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724
Users Manual

Ohms Measurement

Accuracy ± Ω
Ohms Range 4-Wire 2- and 3-Wire*
0 to 400 Ω 0.1 0.15 400 to 1.5 kΩ 0.5 1.0
1.5 to 3.2 kΩ 11.5
Excitation Current: 0.2 mA Maximum input voltage: 30 V Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ± 0.005 % of range per °C
* 2-wire: Does not include lead resistance.
3-wire: Assumes matched leads with a total resistance not exceeding 100 Ω.

Ohms Source

15 to 400 Ω 0.15 to 0.5 mA 0.15 15 to 400 Ω 0.5 to 2 mA 0.1 400 to 1.5 kΩ 0.05 to 0.8 mA 0.5
1.5 to 3.2 kΩ 0.05 to 0.4 mA 1
15 to 400 Ω 0.1 Ω 400 to 3.2 kΩ 1 Ω
Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ± 0.005 % of resistance range per °C
Ohms Range
Excitation Current from
Measurement Device
Resolution
Accuracy
± Ω
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Temperature Calibrator
Specifications

Millivolt Measurement and Source*

Range Resolution Accuracy
-10 mV to 75 mV 0.01 mV ±(0.025 % + 1 count)
Maximum input voltage: 30 V Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ±0.005 % of range per °C
*Select this function by pressing T. The signal is available at the thermocouple miniplug connector.

Temperature, Thermocouples

Measure and Source
Type Range
J -200 to 0 °C
0 to 1200 °C
K -200 to 0 °C
0 to 1370 °C
T -200 to 0 °C
0 to 400 °C
E -200 to 0 °C
0 to 950 °C
Accuracies (ITS-90)
1.0 °C
0.7 °C
1.2 °C
0.8 °C
1.2 °C
0.8 °C
0.9 °C
0.7 °C
R -20 to 0 °C
0 to 500 °C 500 to 1750 °C
S -20 to 0 °C
0 to 500 °C 500 to 1750 °C
B 600 to 800 °C
800 to 1000 °C 1000 to 1800 °C
L -200 to 0 °C
0 to 900 °C
U -200 to 0 °C
0 to 400 °C
N -200 to 0 °C
0 to 1300 °C
Resolution:
J, K, T, E, L, N, U: 0.1 °C, 0.1 °F B, R, S: 1 °C, 1 °F
2.5 °C
1.8 °C
1.4 °C
2.5 °C
1.8 °C
1.5 °C
2.2 °C
1.8 °C
1.4 °C
0.85 °C
0.7 °C
1.1 °C
0.75 °C
1.5 °C
0.9 °C
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724
Users Manual

Temperature, RTD Ranges, and Accuracies (ITS-90)

Accuracy
Type Range °C Measure 4-Wire °C Measure 2- and 3-Wire* °C Source °C
Ni120 -80 to 260 0.2 0.3 0.2 Pt100-385 - 200 to 800 0.33 0.5 0.33 Pt100-392 -200 to 630 0.3 0.5 0.3 Pt100-JIS -200 to 630 0.3 0.5 0.3 Pt200-385 -200 to 250
250 to 630
Pt500-385 -200 to 500
500 to 630
Pt1000-385 -200 to 100
100 to 630
Resolution: 0.1 °C, 0.1 °F Allowable excitation current (source): Ni120, Pt100-385, Pt100-392, Pt100-JIS, Pt200-385: 0.15 to 3.0 mA
Pt500-385: 0.05 to 0.80 mA; Pt1000-385: 0.05 to 0.40 mA RTD Source: Addresses pulsed transmitters and PLCs with pulses as short as 5 ms. * 2-wire: Does not include lead resistance. 3-wire: Assumes matched leads with a total resistance not exceeding 100 Ω.
0.2
0.8
0.3
0.4
0.2
0.2
0.3
1.6
0.6
0.9
0.4
0.5
0.2
0.8
0.3
0.4
0.2
0.2
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Temperature Calibrator
Specifications

Loop Power Supply

Voltage: 24 V Maximum current: 22 mA Short circuit protected

General Specifications

Operating temperature -10 °C to 55 °C Storage temperature - 20 °C to 71 °C Operating altitude 3000 meters above mean sea level Relative Humidity (% RH operating without condensation) 90 % (10 to 30 °C)
75 % (30 to 40 °C) 45 % (40 to 50 °C) 35 % (50 to 55 °C) uncontrolled < 10 °C
Vibration Random, 2 g, 5 to 500 Hz Safety EN 61010-1:1993, ANSI/ISA S82.01-1994; CAN/CSA C22.2
No 1010.1:1992 Power requirements 4 AA alkaline batteries Size 96 x 200 x 47 mm. (3.75 x 7.9 x 1.86 in) Weight 650 gm (1 lb, 7 oz)
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Page 51

Index

—0—
0% output parameter, setting, 30
—1—
100% output parameter, setting, 30
—A—
Auto ramping output, 31
—B—
Batteries, replacing, 35
—C—
Calibration, 36 Cleaning calibrator, 36
—D—
Display, 13
—E—
Electrical parameters
measurement, 19 sourcing, 26
—G—
Getting started, 14
—I—
Input terminals, 8 Input/output terminals and connectors
(table), 9
—K—
Key functions (table), 11 Keys, 10
—M—
Measure functions, summary (table), 2 Measure mode, 17 Measuring
temperature with RTDs, 23 temperature with thermocouples, 20
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724
Users Manual
—O—
Output device, testing, 34 Output terminals, 8
—P—
Parts list, 37
—R—
Recalling setups, 31 Repair, 36 RTD
simulating, 27
RTD
measuring, 23 types, 23
—S—
Safety information, 3 Servicing, 36 Setup
recalling, 31
storing, 31 Thermocouple, 27 Simulating
RTD, 27
thermocouples, 27 Source functions, summary (table), 2 Sourcing
electrical parameters, 26
thermocouples, 27 Specifications, 39 Standard equipment, 3 Stepping output, 30
Storing setups, 31
—T—
Temperature
measuring with RTD, 23 measuring with thermocouple, 20
Terminals
input, 8 output, 8
Thermocouple
measuring, 20 measuring temperature, 20 sourcing, 27 types, 20
Transmitter, calibrating, 32
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