® 725Ex Multifunction Process Calibrator Calibration Manual PN 2406553 January 2005 Rev. 1, 5/09 © 2005, 2009 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
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.
Table of Contents Title Introduction........................................................................................................ Read First – Safety Information......................................................................... Symbols ............................................................................................................. Ex-Hazardous Areas .......................................................................................... Specifications........................
725Ex Calibration Manual Lower Display mV Source Tests................................................................... Lower Display Voltage Source Tests ............................................................ Lower Display Ohms Source Tests ............................................................... Pressure Module Input................................................................................... Calibration Adjustment Procedures ..........................................................
List of Tables Table 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Title Symbols.................................................................................................................. Approved Batteries................................................................................................. Required Equipment and Software ........................................................................ Upper Display Voltage Readings...............................................
725Ex Calibration Manual iv
List of Figures Figure 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. Title Replacing the Batteries........................................................................................... Upper Display Voltage Test Connections .............................................................. Lower Display mV and Voltage Test Connections................................................ Upper Display mA Test Connections......................................................
725Ex Calibration Manual vi
Introduction WWarning The information provided in this manual is for the use of qualified personnel only. Do not perform the verification tests or calibration procedures described in this manual unless qualified to do so.
725Ex Calibration Manual Read First – Safety Information In this calibration manual, 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 test instruments. W Warning To avoid electric shock, injury, damage to the Calibrator, or ignition of an explosive atmosphere, follow all equipment safety procedures.
Multifunction Process Calibrator Symbols • When servicing the Calibrator, use only specified replacement parts. Do not open the Calibrator case. Opening the case invalidates the Calibrator’s Ex Approval. • Do not allow water inside the case. • Before each use, verify the Calibrator’s operation by measuring a known voltage. • Never touch the probe to a voltage source when the test leads are plugged into the current terminals. • Do not operate the Calibrator around explosive dust.
725Ex Calibration Manual Ex-Hazardous Areas An Ex-hazardous area as used in this manual refers to an area made hazardous by the potential presence of flammable or explosive vapors. These areas are also referred to as hazardous locations, see NFPA 70 Article 500 or CSA C22.1 Section 18. The Model 725Ex Multifunction Calibrator has been designed for use in Ex-hazardous areas. These are areas where potentially flammable or explosive vapors may occur.
Multifunction Process Calibrator Specifications Specifications All specifications apply from +18 °C to +28 °C unless stated otherwise. All specifications assume a five-minute warmup period. DC Voltage Measurement Range Resolution Accuracy, (% of Reading + Counts) 30 V (upper display) 0.001 V 0.02 % + 2 10 V (lower display) 0.001 V 0.02 % + 2 90 mV 0.01 mV 0.02 % + 2 Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ±0.
725Ex Calibration 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 1 1.5 Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ±0.005 % of range per °C Excitation Current: 0.2 mA Maximum input voltage: 30 V * 2-wire: Does not include lead resistance. 3-wire: Assumes matched leads with a total resistance not exceeding 100 Ω.
Multifunction Process Calibrator Specifications Temperature, Thermocouples Type Range Measure and Source Accuracies -200 to 0 °C 0 to 1200 °C -200 to 0 °C 0 to 1370 °C -200 to 0 °C 0 to 400 °C -200 to 0 °C 0 to 950 °C -20 to 0 °C 0 to 500 °C 500 to 1750 °C -20 to 0 °C 0 to 500 °C 500 to 1750 °C 600 to 800 °C 800 to 1000 °C 1000 to 1800 °C -200 to 0 °C 0 to 900 °C -200 to 0 °C 0 to 400 °C -200 to 0 °C 0 to 1300 °C -200 to 100 °C -100 to 800 °C 0 to 800 °C 800 to 2500 °C J K T E R S B L U N XK BP 1.
725Ex Calibration Manual Temperature, RTD Ranges, and Accuracies Range °C Type Accuracy Measure 2and 3-Wire* °C Measure 4Wire °C Source °C Ni120 -80 to 260 0.2 0.3 0.2 Pt100-385 -200 to 800 0.33 0.5 0.33 Pt100-3926 -200 to 630 0.3 0.5 0.3 Pt100-3916 -200 to 630 0.3 0.5 0.3 Pt200-385 -200 to 250 250 to 630 0.2 0.8 0.3 1.6 0.2 0.8 Pt500-385 -200 to 500 500 to 630 0.3 0.4 0.6 0.9 0.3 0.4 Pt1000-385 -200 to 100 100 to 630 0.2 0.2 0.4 0.5 0.2 0.2 Resolution: 0.1 °C, 0.
static awareness A Message From Fluke Corporation Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices by: 1. Knowing that there is a problem. 2. Learning the guidelines for handling them. 3. Using the procedures, packaging, and bench techniques that are recommended. The following practices should be followed to minimize damage to S.S. (static sensitive) devices. 1.
5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT. 8. WHEN REMOVING PLUG-IN ASSEMBLIES HANDLE ONLY BY NON-CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION. PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S.S. DEVICES. 6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE. 9. HANDLE S.S. DEVICES ONLY AT A STATIC-FREE WORK STATION. 10. ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED. 11. ONLY GROUNDED-TIP SOLDERING IRONS SHOULD BE USED. 7.
Multifunction Process Calibrator Basic Maintenance Basic 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. W Caution To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers. Clean the Calibrator with a soft cloth dampened with water or water and mild soap.
725Ex Calibration Manual Hex Key bah01f.eps Figure 1.
Multifunction Process Calibrator Required Equipment Required Equipment Equipment and software required to perform the procedures in this manual are identified in Table 3. If the recommended equipment model is not available, other equipment can be substituted if it meets the specifications indicated. WWarning To avoid safety hazards and equipment damage during the calibration procedures, use the specified calibration equipment listed in Table 3.
725Ex Calibration Manual Performance Tests XWWarning Some of the performance tests involve the use of high voltages and should be performed by qualified personnel only. To avoid electric shock, always set the calibration source (5520A) to Standby (STBY) mode between tests and before handling the test connections or test cables. Performance tests confirm the complete operability of the Calibrator and check the accuracy of each function against the Calibrator’s specifications.
Multifunction Process Calibrator Performance Tests Upper Display Voltage Measurement Tests 1. Press RESET on the 5520A. 2. Press l on the UUT until V appears on the upper display. 3. Make the connections shown in Figure 2. 4. Set up the 5520A to output each of the voltages in Table 4 and verify that the UUT readings are within the limits shown. 5. Press STBY on the 5520A. aal03f.eps Figure 2. Upper Display Voltage Test Connections Table 4. Upper Display Voltage Readings 5520A Outputs UUT Readings 0.
725Ex Calibration Manual Lower Display mV Measurement Tests 1. Press RESET on the 5520A. 2. Press V on the UUT until MEASURE and mV appear on the lower display. 3. Make the connections shown in Figure 3. 4. Set up the 5520A to output each of the voltages in Table 5 and verify that the UUT readings are within the limits shown. 5. Press STBY on the 5520A. aal04f.eps Figure 3. Lower Display mV and Voltage Test Connections Table 5. Lower Display mV Readings 5520A Outputs 14 UUT Readings 0.00 mV -0.
Multifunction Process Calibrator Performance Tests Lower Display Voltage Measurement Tests 1. Press RESET on the 5520A. 2. Press V on the UUT until MEASURE and V appear on the lower display. 3. Make the connections shown in Figure 3. 4. Set up the 5520A to output each of the voltages in Table 6 and verify that the UUT readings are within the limits shown. 5. Press STBY on the 5520A. Table 6. Lower Display Voltage Readings 5520A Outputs UTT Readings 0.000 V -0.002 V to +0.002 V 10.000 V 9.996 V to 10.
725Ex Calibration Manual Upper Display mA Measurement Tests 1. Press RESET on the 5520A. 2. Press l on the UUT until MEASURE and mA appear on the upper display. 3. Make the connections shown in Figure 4. 4. Set up the 5520A to output each of the voltages in Table 7 and verify that the UUT readings are within the limits shown. 5. Press STBY on the 5520A. aal05f.eps Figure 4. Upper Display mA Test Connections Table 7. Upper Display mA Readings 5520A Settings 16 UUT Readings 0.000 mA -0.002 mA to +0.
Multifunction Process Calibrator Performance Tests Lower Display mA Measurement Tests 1. Press RESET on the 5520A. 2. Press l on the UUT until MEASURE and mA appear on the lower display. 3. Make the connections shown in Figure 5. 4. Set up the 5520A to output each of the voltages shown in Table 8 and verify that the UUT readings are within the limits shown. 5. Press STBY on the 5520A. aal06f.eps Figure 5. Lower Display mA Test Connections Table 8. Lower Display mA Readings 5520A Outputs UUT Readings 0.
725Ex Calibration Manual Lower Display Frequency Measurement Test 1. Set the 5520A to source a 40 Hz, 1 V peak-to-peak square wave (use the blue softkey under the wave type to change the wave shape). 2. Press F on the UUT until MEASURE and Hz appear on the lower display. 3. Make the connections shown in Figure 6. 4. Verify that the UUT frequency reads between 39.8 Hz and 40.2 Hz. 5. Press F on the UUT to change the lower display to kHz. 6. Set the 5520A to source a 10 kHz, 1 V peak-to-peak square wave. 7.
Multifunction Process Calibrator Performance Tests Lower Display Frequency Source Test 1. Press M on the UUT until SOURCE appears on the lower display. 2. Press F on the UUT until Hz appears on the lower display. 3. Configure the HP 3458A to measure frequency. 4. Make the connections shown in Figure 7. 5. Use the arrow keys on the UUT to set the UUT output to the frequencies in Table 9 and verify that the HP 3458A readings are within the limits shown.
725Ex Calibration Manual Lower Display 4-Wire Resistance Measurement Tests 1. Press F on the UUT until Ω appears on the lower display. If necessary, use M to get to the measure mode, and use X to get to the 4W mode. (MEASURE should also appear on the lower display). 2. Set the 5520A to 2-wire output with 2-wire compensation off. 3. Make the connections shown in Figure 8. 4. Set the 5520A to source the resistance values in Table 10 and verify that the UUT resistance readings are within the limits shown. 5.
Multifunction Process Calibrator Performance Tests Lower Display 4-Wire RTD Measurement 1. Press R on the UUT until the lower display reads PT3916. If necessary, use D to select °C units and X to get to the 4W mode. (MEASURE should also appear on the lower display.) 2. Set the 5520A to 2-wire output with 2-wire compensation off. 3. Make the connections shown in Figure 8. 4.
725Ex Calibration Manual Lower Display 3-Wire RTD Measurement 1. Press R on the UUT until the lower display reads PT3916. If necessary, use D to select °C units and the arrow keys to get to the 3W mode. (MEASURE should also appear on the lower display.) 2. Set the 5520A to 2-wire output with 2-wire compensation off. 3. Make the connections shown in Figure 9. 4.
Multifunction Process Calibrator Performance Tests Lower Display Thermocouple Measurement Tests 1. Remove the test leads from the UUT terminals; then connect a type J thermocouple lead between the TC jack on the UUT and the TC jack on the 5520A as shown in Figure 10. 2. Press T on the UUT until J appears on the lower display. If necessary, press D so the temperature is displayed in °C. 3.
725Ex Calibration Manual Lower Display Thermocouple Source Tests 1. Set the 5520A to measure type J thermocouple voltages. 2. Press M on the UUT until SOURCE appears on the lower display. If necessary, press T on the UUT until J appears on the lower display and press D so the temperature is displayed in °C. 3. Use the arrow keys to set the UUT outputs to the temperatures in Table 13 and verify that the 5520A temperature readings are within the limits shown. 4. Press STBY on the 5520A.
Multifunction Process Calibrator Performance Tests Lower Display mA Source Tests 1. Press M on the UUT until SOURCE appears on the lower display; then press V until mA appears on the lower display. If necessary, press M until SOURCE appears on the lower display. 2. Set the HP 3458A to measure dc current. 3. Connect the UUT and the HP 3458A as shown in Figure 11. 4. Use the arrow keys on the UUT to set the UUT to the currents in Table 14 and verify that the HP 3458A readings are within the limits shown.
725Ex Calibration Manual Lower Display mV Source Tests 1. Press M on the UUT until SOURCE appears on the lower display; then press V until mV appears on the lower display. 2. Set the HP 3458A to measure dc voltage in the 200 mV range. 3. Connect the UUT to the HP 3458A as shown in Figure 7. 4. Use the arrow keys on the UUT to set the UUT output to the current values in Table 15 and verify that the HP 3458A readings are within the limits shown. 5. Press Mon the UUT to disable the sourcing function.
Multifunction Process Calibrator Performance Tests Lower Display Ohms Source Tests 1. Press F on the UUT until Ω appears on the lower display. If necessary, press M until SOURCE appears on the lower display. 2. Set the HP 3458A to measure 4-wire resistance. 3. Make the connections shown in Figure 12. 4. Use the arrow keys on the UUT to set the UUT output to the resistance values in Table 17 and verify that the HP 3458A readings are within the limits shown. aal13f.eps Figure 12.
725Ex Calibration Manual Pressure Module Input 1. Connect a Fluke 700 Series Pressure Module to the 5-pin LEMO connector at the top of the UUT; then press U. 2. Verify that the display first shows -----psi, then changes to a pressure value. 3. Disconnect the pressure module from the UUT. The performance tests are now complete. Disconnect and secure all test equipment. Calibration Adjustment Procedures The 725Ex Calibrator has an electronic calibration.
Multifunction Process Calibrator Calibration Adjustment Procedures Initiating Communication Starting with the UUT off, push and hold Q while turning the UUT on. Continue to hold Q until "Cal mode" is displayed.
725Ex Calibration Manual Cal Volts Input Connect the UUT as shown in Figure 13. aal04f.eps Figure 13. Volts Input Calibration Connections From the Calibration Menu, type the cal step for Cal Volts Input. The PC displays: Enter 0 Volts - press space bar to continue Set the Fluke 5520A to output 0.0000 V, then press the space bar. After a short while, the following calibration constant and prompt are displayed on the PC: Offset = -40 Enter 10.
Multifunction Process Calibrator Calibration Adjustment Procedures Cal Volts Output Connect the UUT as shown in Figure 14. aal08f.eps Figure 14. Volts Output Calibration Connections From the Calibration Menu, type the number or letter for Cal Volts Output. The PC displays: Zero into DAC. Enter the Volts displayed : Set the HP 3458 to read V DC. Be sure the NPLC on the HP 3458 is slow enough to get stable readings to four decimal places.
725Ex Calibration Manual Cal mA Input Connect the UUT as shown in Figure 15. aal06f.eps Figure 15. mA Input Calibration Connections From the Calibration Menu, type the cal step for Cal mA Input. The PC displays: Enter 0 ma - press space bar to continue Set the Fluke 5520A to output 0.000 mA, let the reading settle a few seconds, then press the space bar on the PC. After a short while, the PC displays the following calibration constant and new prompt: Offset = -337 Enter 24.
Multifunction Process Calibrator Calibration Adjustment Procedures Cal mA Output Connect the UUT as shown in Figure 16. aal12f.eps Figure 16. mA Output Calibration Connections From the Calibration Menu, enter the cal step for Cal mA Output. The PC displays: Zero into DAC. Enter mA displayed : Set the HP 3458 to read DC current. Be sure the NPLC on the HP 3458 is slow enough to get stable readings to four decimal places.
725Ex Calibration Manual Cal mV Input Connect the UUT as shown in Figure 17. aal04f.eps Figure 17. mV Input Calibration Connections From the Calibration Menu, type the number or letter for Cal mV Input. The PC displays: Enter 0 mV - press space bar to continue Set the Fluke 5520A to output 0.000 mV, let the output settle then press the space bar on the PC. After a short while, the PC displays the following calibration constant and new prompt: Offset = -714 Enter 90.
Multifunction Process Calibrator Calibration Adjustment Procedures Cal mV Output Connect the UUT as shown in Figure 18. aal08f.eps Figure 18. mV Output Calibration Connections From the Calibration Menu, enter the cal step for Cal mV Output. The PC displays: Zero into DAC. Enter mV displayed : Set the HP 3458 to read V DC. Be sure the NPLC on the HP 3458 is slow enough to get stable readings to three decimal places.
725Ex Calibration Manual Cal Thermocouples Connect the UUT as shown in Figure 19. aal11f.eps Figure 19. Thermocouples Calibration Connections From the Calibration Menu, enter the cal step for Cal Thermocouples. The PC displays: Connect accurate T/C source : TYPE J thermocouple Simulate 0.0 degrees C - press space bar to continue Set the Fluke 5520A to output 0.00 degrees C for a type-J thermocouple using the ITS-90 standard, then press the space bar on the PC.
Multifunction Process Calibrator Calibration Adjustment Procedures Cal Ohms Hi Source Connect the UUT as shown in Figure 20. aal13f.eps Figure 20. Ohms Hi Source Calibration Connections From the Calibration Menu, enter the cal step for Cal Ohms Hi Source. The PC displays: 2500 into DAC. Enter Ohms displayed : Set the HP 3458 to read 4-terminal Ohms. Be sure the NPLC on the HP 3458 is slow enough to get stable readings.
725Ex Calibration Manual Cal Ohms Low Source The UUT connection is the same as cal Ohms Hi Source, it is shown in Figure 20. From the Calibration Menu, enter the cal step for Cal Ohms Low Source. The PC displays: 2500 into DAC. Enter Ohms displayed : Set the HP 3458 to read 4 terminal Ohms. Be sure the NPLC on the HP 3458 is slow enough to get stable readings. When the reading on the HP 3458 has stabilized, enter the value in Ohms on the PC, then press Enter.
Multifunction Process Calibrator Calibration Adjustment Procedures Cal RTD Low Range Connect the UUT as shown in Figure 21. aal09f.eps Figure 21. RTD Low Range Calibration Connections From the Calibration Menu, enter the cal step for Cal RTD Low Range. The PC displays: Apply 15 ohms to 4 wire jacks press space bar to continue Set the Fluke 5520A to output 15.00 Ohms, 2-wire output with 2-wire comp off, then press the space bar on the PC.
725Ex Calibration Manual Cal RTD Hi Range The UUT connection is the same as Cal RTD Low Range, it is shown in Figure 21. From the Calibration Menu, enter the cal step for Cal RTD Hi Range. The PC displays: Apply 500 ohms to 4 wire jacks press space bar to continue Set the Fluke 5520A to output 500.0 Ohms, 2-wire output with 2-wire comp off, then press the space bar on the PC.
Multifunction Process Calibrator Calibration Adjustment Procedures Cal ISO Volts Connect the UUT as shown in Figure 22. aal03f.eps Figure 22. ISO Volts Calibration Connections From the Calibration Menu, enter the cal step for Cal ISO Volts. The PC displays: Enter 0 Volts - press space bar to continue Set the Fluke 5520A to output 0.0000 V, then press the space bar on the PC. After a short while the PC displays the following a calibration constant and new prompt: Offset = -324 Enter 30.
725Ex Calibration Manual Cal ISO mA Connect the UUT as shown in Figure 23. aal05f.eps Figure 23. ISO mA Calibration Connections From the Calibration Menu, enter the cal step for Cal ISO mA. The PC displays: Enter 0 ma - press space bar to continue Set the Fluke 5520A to output 0.0000 mA. After a short while, the PC displays the following calibration constants and prompt: Offset = -323 Enter 24.00 ma - press space bar to continue Set the Fluke 5520A to output 24.
Multifunction Process Calibrator Replaceable Parts Replaceable Parts When servicing this Calibrator, use only the replacement parts specified. Userreplaceable parts are listed in Table 18. Table 18. User Replaceable Parts Description Part Number Qty. AA alkaline batteries See “Table 2.
725Ex Calibration Manual 44
