Fluke 724 Calibration Manual
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Fluke 724 Calibration Manual

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®
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
®
724/725
Calibrators
Calibration Manual
PN 667581
September 1999 Rev.1, 3/00
© 1999, 2000 Fluke Corporation. All rights reserved. Printed in USA
All product names are trademarks of their respective companies.

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Summary of Contents for Fluke 724

  • Page 1 ® Advanced Test Equipment Rentals www.atecorp.com 800-404-ATEC (2832) ® 724/725 Calibrators Calibration Manual PN 667581 September 1999 Rev.1, 3/00 © 1999, 2000 Fluke Corporation. All rights reserved. Printed in USA All product names are trademarks of their respective companies.
  • Page 2 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.

  • Page 3: Table Of Contents

    International Symbols..................3 Specifications ....................4 DC Voltage Measurement................4 DC Voltage Source ..................4 DC mA Measurement and Source (Measurement only for 724) ....4 Ohms Measurement ..................4 Ohms Source ....................5 Frequency Measurement (725 only) ............. 5 Frequency Source (725 only) ................
  • Page 4 Setup......................32 Initiating Communication ................33 Cal Volts Input ....................34 Cal Volts Output ................... 35 Cal mA Input (Fluke 725 Only) ..............36 Cal mA Output (Fluke 725 Only) ..............37 Cal mV Input....................38 Cal mV Output ....................39 Cal Thermocouples ..................
  • Page 5 List of Tables Table Title Page International Symbols .................... 3 Upper Display Remote Commands ............... 11 Lower Display Remote Commands ............... 12 Remote Commands for Sensor Selection .............. 13 Required Equipment and Software................ 14 Upper Display Voltage Readings ................16 Lower Display mV Readings.................
  • Page 6 724/725 Calibration Manual...
  • Page 7 List of Figures Figure Title Page Replacing the Batteries ..................10 Upper Display Voltage Test Connections ............. 16 Lower Display mV and Voltage Test Connections ..........17 Upper Display mA Test Connections ..............19 Lower Display mA Test Connections..............20 Lower Display Frequency Test Connections............
  • Page 8 724/725 Calibration Manual...

  • Page 9: Introduction

    Do not perform the verification tests or calibration procedures described in this manual unless you are qualified to do so. This Calibration Manual provides the following information for the Fluke 724 Temperature Calibrator and the Fluke 725 Multifunction Process Calibrators (also referred to as "the Calibrator"...

  • Page 10: Read First - Safety Information

    724/725 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. Warnings To avoid possible electric shock or personal injury: •...

  • Page 11: International Symbols

    Calibrators International Symbols Warnings (cont.) • When servicing the Calibrator, use only specified replacement parts. • To avoid false readings, which can lead to possible electric shock or personal injury, replace the batteries as soon as the low battery indicator ( ) appears.

  • Page 12: Specifications

    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 DC mA Measurement and Source (Measurement only for 724) Range Resolution Accuracy ( % of Reading + Counts) 24 mA 0.001 mA...

  • Page 13: Ohms Source

    Calibrators Specifications Ohms Source Accuracy Ohms Range Excitation Current from Measurement Device 15 Ω to 400 Ω ±0.15 Ω 0.15 mA to 0.5 mA 15 Ω to 400 Ω ±0.1 Ω 0.5 mA to 2 mA 400 Ω to 1.5 kΩ ±0.5 Ω...

  • Page 14: Temperature, Thermocouples

    724/725 Calibration Manual Temperature, Thermocouples Type Range (°C) Measure and Source Accuracies (°C) -200 to 0 0 to 1200 -200 to 0 0 to 1370 -200 to 0 0 to 400 -200 to 0 0 to 950 -20 to 0...

  • Page 15: Temperature, Rtd Ranges, And Accuracies

    Calibrators Specifications Temperature, RTD Ranges, and Accuracies Accuracy Measure Measure* Type Range (°C) 4-wire (°C) 2- and 3-wire (°C) Source (°C) Ni120 -80 to 260 Pt100-385 - 200 to 800 0.33 0.33 Pt100-392 -200 to 630 Pt100-JIS -200 to 630 Pt200-385 -200 to 250 250 to 630...

  • Page 16: Pressure Units Availability (725 Only)

    724/725 Calibration Manual Pressure Units Availability (725 only) Unit Availability Available on all pressure ranges All ranges through 3000 psi All ranges through 1000 psi 15 psi and above mbar All ranges through 1000 psi Available on all pressure ranges...

  • Page 17: Cleaning The Calibrator

    Calibrators Cleaning the Calibrator Cleaning the Calibrator Warning To avoid electric shock or damage to the Calibrator, never allow water inside the Calibrator’s case. If the Calibrator requires cleaning, wipe it down with a cloth that is lightly dampened with water or a mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or methanol-based fluids when cleaning the Calibrator.

  • Page 18: Replacing The Batteries

    724/725 Calibration Manual Replacing the Batteries Warning To avoid electric shock, remove the test leads from the Calibrator before opening the battery door. Close and latch the battery door before using the Calibrator. To avoid false readings, which can lead to possible electric shock or...

  • Page 19: Remote Control Interface (725 Only)

    To activate the remote control interface, proceed as follows: 1. Turn off the UUT; then use the Fluke 700SC serial interface cable to connect the UUT to a serial port on the PC.

  • Page 20: Lower Display Remote Commands

    724/725 Calibration Manual Table 3. Lower Display Remote Commands Remote Command Description mA measurement mA source mA 2W Sim Voltage measurement Voltage source mV measurement mV source kHz measurement kHz source Hz measurement Hz source CPM measurement CPM source Ohms measurement (default 2W)

  • Page 21: Remote Commands For Sensor Selection

    Calibrators Remote Control Interface (725 only) Table 4. Remote Commands for Sensor Selection Selection Entry Serial Input Thermocouple Type RTD Type Pt100 (3926) Pt100 (385) Pt100 (3916) Pt200 (385) Pt500 (385) Pt1000 (385) Ni120...

  • Page 22: Required Equipment

    Temperature: Type J thermocouple 90 day accuracy: ±0.2 °C Resistance accuracy: ±0.006 % Frequency accuracy: ±0.01 % MET/CAL ® Metrology Version 6.0 or later Contact Fluke for the latest version. Software (see MET/CAL Installation and Upgrade Guide for minimum hardware requirements)

  • Page 23: Performance Tests

    Calibrator’s specifications. If the Calibrator fails any performance test, it needs calibration adjustments. If the Calibrator continues to fail after calibration adjustments, send it to an authorized Fluke Service Center for repair. The Calibrator’s performance and accuracy are specified for one year after calibration at operating temperatures of +18 °C to +28 °C (64 °F to 82 °F), in relative humidity to 90...

  • Page 24: Upper Display Voltage Measurement Tests

    724/725 Calibration Manual 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 6 and verify that the UUT readings are within the limits shown.

  • Page 25: Lower Display Mv Measurement Tests

    Calibrators Performance Tests 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 7 and verify that the UUT readings are within the limits shown.

  • Page 26: Lower Display Voltage Measurement Tests

    724/725 Calibration Manual 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 8 and verify that the UUT readings are within the limits shown.

  • Page 27: Upper Display Ma Measurement Tests

    Calibrators Performance Tests 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 9 and verify that the UUT readings are within the limits shown.

  • Page 28: Lower Display Ma Measurement Tests (725 Only)

    724/725 Calibration Manual Lower Display mA Measurement Tests (725 only) 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 10 and verify that the UUT readings are within the limits shown.

  • Page 29: Lower Display Frequency Measurement Test (725 Only)

    Calibrators Performance Tests Lower Display Frequency Measurement Test (725 only) 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.

  • Page 30: Lower Display Frequency Source Test (725 Only)

    724/725 Calibration Manual Lower Display Frequency Source Test (725 only) 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; then make the connections shown in Figure 7.

  • Page 31: Lower Display 4-Wire Resistance Measurement Tests

    Calibrators Performance Tests 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).

  • Page 32: Lower Display 4-Wire Rtd Measurement

    724/725 Calibration Manual 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.)

  • Page 33: Lower Display 3-Wire Rtd Measurement

    Calibrators Performance Tests 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.

  • Page 34: Lower Display Thermocouple Measurement Tests

    724/725 Calibration Manual 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.

  • Page 35: Lower Display Thermocouple Source Tests

    Calibrators Performance Tests 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.

  • Page 36: Lower Display Ma Source Tests (725 Only)

    724/725 Calibration Manual Lower Display mA Source Tests (725 only) 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.

  • Page 37: Lower Display Mv Source Tests

    Calibrators Performance Tests 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.

  • Page 38: Lower Display Ohms Source Tests

    14.9 Ω to 15.1 Ω 360.0 Ω 359.9 Ω to 360.1 Ω 1500 Ω 1499.5 Ω to 1500.5 Ω 3200 Ω 3199.0 Ω to 3201.0 Ω The performance tests for the 724 are now complete. Disconnect and secure all test equipment.

  • Page 39: Pressure Module Input

    Performance Tests 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.

  • Page 40: Calibration Adjustment Procedures

    10-pin header in the battery compartment. This cable will also work with the 725. Throughout these procedures, the Fluke 724 and Fluke 725 are referred to as UUT. Two methods of calibration are available for the UUT: using a a serial-based program via a PC (see Table 2 for requirements), and using a Met/Cal calibration procedure.

  • Page 41: 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. The calibration menus, as seen on the PC screen, are as follows: 725 Calibration Menu 724 Calibration Menu Calibrate Menu Calibrate Menu 1 - Cal Volts Input...

  • Page 42: Cal Volts Input

    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 = Enter 10.00 Volts...

  • Page 43: Cal Volts Output

    Calibrators Calibration Adjustment Procedures Cal Volts Output Connect the UUT as shown in Figure 14. Warning Ω SENSE 30 V maximum to INPUT 30V MAX ALL TERMINALS SOURCE / MEASURE MEASURE mA + LOOP mA - GUARD HP3458 aal08f.eps Figure 14. Volts Output Calibration Connections From the Calibration Menu, type the number or letter for Cal Volts Output.

  • Page 44: Cal Ma Input (Fluke 725 Only)

    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...

  • Page 45: Cal Ma Output (Fluke 725 Only)

    Calibrators Calibration Adjustment Procedures Cal mA Output (Fluke 725 Only) Connect the UUT as shown in Figure 16. Warning Ω SENSE INPUT 30 V maximum to 30V MAX ALL TERMINALS SOURCE / MEASURE MEASURE mA + LOOP mA - GUARD HP3458 aal12f.eps...

  • Page 46: Cal Mv Input

    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...

  • Page 47: Cal Mv Output

    Calibrators Calibration Adjustment Procedures Cal mV Output Connect the UUT as shown in Figure 18. Warning Ω SENSE 30 V maximum to INPUT 30V MAX ALL TERMINALS SOURCE / MEASURE MEASURE mA + LOOP mA - GUARD HP3458 aal08f.eps Figure 18. mV Output Calibration Connections From the Calibration Menu, enter the cal step for Cal mV Output.

  • Page 48: Cal Thermocouples

    - 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. After a short while, the PC displays the following calibration constant and new prompt: CJC Temp Read = 27.359071...

  • Page 49: Cal Ohms Hi Source

    Calibrators Calibration Adjustment Procedures Cal Ohms Hi Source Connect the UUT as shown in Figure 20. Warning Ω SENSE 30 V maximum to INPUT 30V MAX ALL TERMINALS SOURCE / MEASURE MEASURE mA + LOOP mA - GUARD HP3458 aal13f.eps Figure 20.

  • Page 50: Cal Ohms Low Source

    724/725 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.

  • Page 51: Cal Rtd Low Range

    Apply 350 ohms to 4 wire jacks press space bar to continue Set the Fluke 5520A to output 350.00 Ohms then press the space bar on the PC. After a short while, the Calibrator will return to the Calibration Menu.

  • Page 52: Cal Rtd Hi Range

    Apply 3200 ohms to 4 wire jacks press space bar to continue Set the Fluke 5520A to output 3200.0 Ohms, then press the space bar on the PC. After a short while, the Calibrator will return to the Calibration Menu.

  • Page 53: Cal Iso Volts

    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:...

  • Page 54: Cal Iso Ma

    Enter 24.00 ma - press space bar to continue Set the Fluke 5520A to output 24.0000 mA then press the space bar on the PC. After a short while, the PC displays the following calibration constants: diff = (Counts - Offset)

  • Page 55: Replaceable Parts

    Tilt stand 659026 Battery door 1/4-turn fasteners 948609 TL75 series test leads 855742 Test lead, red 688051 Test lead, black 688066 AC70A alligator clip, red 738047 AC70A alligator clip, black 738120 724 Case top decal 1548329 725 Case top decal 690948...
  • Page 56 Calibration Manual Table 20. Replacement Parts (cont.) Item Description Fluke No. Quantity 724 Product Overview 1547851 725 Product Overview 1549644 724 CD-ROM (contains Users Manual) 1547849 725 CD-ROM (contains Users Manual) 1549615 700SC serial interface cable 667425 Optional shown accessory aal02f.eps...

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