Fluke 724 Calibration Manual
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Fluke 724 Calibration Manual

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724/725/726
Calibrators
Calibration Manual
PN 667581
September 1999 Rev. 2, 2/06
© 1999, 2000, 2006 Fluke Corporation. All rights reserved. Printed in USA
All product names are trademarks of their respective companies.

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  • Page 1 ® 724/725/726 Calibrators Calibration Manual PN 667581 September 1999 Rev. 2, 2/06 © 1999, 2000, 2006 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

    Millivolt Measurement and Source (724 and 725) ........7 Temperature, Thermocouples (724 and 725)..........7 Temperature, Thermocouples (726) .............. 8 Temperature, RTD Ranges, and Accuracies (724 and 725) ......9 RTD Accuracy (Read and Source) (ITS-90) (726)........10 Loop Power Supply ..................11 Pressure Measurement (725 and 726) ............
  • Page 4 Pressure Module Input (725/726)..............39 Calibration Adjustment..................39 Setup ......................39 Initiating Communication (724 and 725) ............40 Calibration Adjustment Procedures (724 and 725) ........41 Cal Volts Input ..................41 Cal Volts Output ..................42 Cal mA Input (Fluke 725 Only) ..............43 Cal mA Output (725 Only) ...............
  • Page 5 List of Tables Table Title Page International Symbols .................... 3 Upper Display Remote Commands (725) .............. 14 Lower Display Remote Commands (725).............. 15 Remote Commands for Sensor Selection (725) ............. 16 Serial Command List-726 ..................17 Required Equipment and Software ................ 23 Upper Display Voltage Readings................
  • Page 6 724/725/726 Calibration Manual...
  • Page 7 List of Figures Figure Title Page Replacing the Batteries and Replaceable Fuses ............. 13 Upper Display Voltage Test Connections .............. 25 Lower Display mV and Voltage Test Connections..........26 Upper Display mA Test Connections..............28 Lower Display mA Test Connections ..............29 Lower Display Frequency Test Connections ............
  • Page 8 724/725/726 Calibration Manual...

  • Page 9: Introduction

    Do not perform the verification tests or calibration procedures described in this manual unless you are qualified to do This Calibration Manual provides the following information for the Fluke 724 Temperature Calibrator and the Fluke 725 and 726 Multifunction Process Calibrators (also referred to as "the Calibrator"...

  • Page 10: Read First - Safety Information

    724/725/726 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

    Refer to the manual. Conforms to relevant Canadian Important information. Standards Association directives Take appropriate precautions. Double insulated Hazardous voltage may be present. Do not dispose of this product as unsorted municipal waste. Contact Fluke or a qualified recycler for disposal.

  • 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 (724 and 725) (Measurement only for 724) Range Resolution...

  • Page 13: Dc Ma Measurement And Source (726)

    24.000 Maximum load on, mA source is 1 kΩ. With the HART resistor on, maximum load is 750 Ω. Voltage input range on simulate mode is 5 to 30 V Ohms Measurement (724 and 725) Ohms Range Accuracy, 4-Wire Accuracy*, 2-Wire, or 3-Wire 0 Ω...

  • Page 14: Ohms Source (726)

    724/725/726 Calibration Manual Ohms Source (726) Accuracy Excitation Current from Ohms Range Minimum Maximum (% of Reading + Measurement Device Floor) 0.015 % + 0.1 Ω Ohms Source (low) 400.0 0.1 to 0.5 mA 0.015 % + 0.05 Ω 400.0 0.5 to 3 mA...

  • Page 15: Frequency Source (726)

    1000.0 0.05 % 10.00 0.25 % KHz Source 10.00 15.00 0.50 % Millivolt Measurement and Source (724 and 725) Range* Resolution Accuracy ±(0.025 % + 1 count) -10 mV to +75 mV 0.01 mV 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.

  • Page 16: Temperature, Thermocouples (726)

    724/725/726 Calibration Manual Temperature, Thermocouples (726) CJC ON CJC OFF Type Minimum Maximum Accuracy Accuracy -210 1200 -200 1000 1000 1372 -250 -250 -100 -100 1000 1767 1767 1000 1000 1820 1000 1000 2316 -200 0.45 0.25 -200 0.45 0.25...

  • Page 17: Temperature, Rtd Ranges, And Accuracies (724 And 725)

    Calibrators Specifications Temperature, RTD Ranges, and Accuracies (724 and 725) Accuracy Type Range (°C) Measure Measure* 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...

  • Page 18: Rtd Accuracy (Read And Source) (Its-90) (726)

    724/725/726 Calibration Manual RTD Accuracy (Read and Source) (ITS-90) (726) Range Minimum Maximum Accuracy Ni120 (672) -80.00 260.00 0.15 -200.00 100.00 0.15 100.00 300.00 0.25 Pt100 (385) 300.00 600.00 0.35 600.00 800.00 0.45 -200.00 100.00 0.15 Pt100 (3926) 100.00 300.00 0.25...

  • Page 19: Loop Power Supply

    Calibrators Specifications Loop Power Supply Voltage: 24 V Maximum current: 22 mA Short circuit protected Pressure Measurement (725 and 726) Range Resolution Accuracy Units Mode (726 Only) O@4 °C, Pushing A for 3 psi, inH O@20 °C, kPa, seconds stores O@4 °C, Determined by Determined by...

  • Page 20: General Specifications

    724/725/726 Calibration Manual General Specifications Operating temperature -10 °C to 55 °C 724 and 725 -10 °C to 50 °C - 20 °C to 70 °C Storage temperature ± 0.005 % of range/°C outside of 23 ± 5 °C Stability...

  • Page 21: Fuses

    Calibrators Fuses Four AA alkaline batteries (ANSI/NEDA 15A or IEC LR6) are used to power the Calibrator. To replace the batteries, refer to Figure 1 and do the following: 1. Turn the Calibrator off, remove the test leads from the terminals, and hold the Calibrator face down.

  • Page 22: Remote Control Interface (725 And 726)

    The 726 remote control interface is always active. To activate the 725 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 23: Lower Display Remote Commands (725)

    Calibrators Remote Control Interface (725 and 726) Table 3. Lower Display Remote Commands (725) 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 24: Remote Commands For Sensor Selection (725)

    724/725/726 Calibration Manual Table 4. Remote Commands for Sensor Selection (725) Selection Entry Serial Input Thermocouple Type RTD Type Pt100 (3926) Pt100 (385) Pt100 (3916) Pt200 (385) Pt500 (385) Pt1000 (385) Ni120...

  • Page 25: Serial Command List (726)

    Table 5. Serial Command List-726 Command Command Response/Actions Comment Ch 1 Ch 2 Arguments *IDN? Returns the ID string Verify model “FLUKE,726,0,{sw_rev}” where number and sw_revision is the firmware firmware revision revision FUNC? Returns {Upper},{Lower} Answers with the configured {Upper} responses...
  • Page 26 724/725/726 Calibration Manual Table 5. Serial Command List-726 (cont.) Command Command Response/Actions Comment Ch 1 Ch 2 Arguments Arguments: Configures {value} {units} the output source Multipliers: function. If the u for micro, m for {value} and milli, and k for kilo {units} are are accepted.
  • Page 27 Calibrators Serial Command List (726) Table 5. Serial Command List-726 (cont.) Command Command Response/Actions Comment Ch 1 Ch 2 Arguments LOWER_MEAS 1 argument, Valid Configures the Modes: measurement function. Sets DCI, DCMV, DCV, the specified TC, RTD, measure mode FREQUENCY, PULSE_TRAIN 1 Argument {value} If the value is...
  • Page 28 724/725/726 Calibration Manual Table 5. Serial Command List-726 (cont.) Command Command Response/Actions Comment Ch 1 Ch 2 Arguments TC_TYPE One argument, valid Set TC type settings: B, C, E, J, K, L, N, R, S, T, U, BP, XK, MV...
  • Page 29 Calibrators Serial Command List (726) Table 5. Serial Command List-726 (cont.) Command Command Response/Actions Comment Ch 1 Ch 2 Arguments CPRT_MAX_T? Returns {number} CEL. CPRT_COEFA 1 argument. Sets the custom CPRT Coefficient A. CPRT_COEFA? Returns the custom CPRT Coefficient A. CPRT_COEFB 1 argument.

  • Page 30: Required Equipment

    724/725/726 Calibration Manual Table 5. Serial Command List-726 (cont.) Command Command Response/Actions Comment Ch 1 Ch 2 Arguments CUST3_ALIAS? Returns screen name for CUST3 Verify RTD 3 RTD. alias HART_ON Turns HART mode on. Switches in 250 Ω resistor HART_OFF Turns HART mode off.

  • Page 31: Required Equipment And Software

    Resistance accuracy: ±0.006 % Frequency accuracy: ±0.01 % MET/CAL ® Metrology Software (see MET/CAL Version 6.0 or later Contact Fluke for the latest version. Installation and Upgrade Guide for minimum hardware requirements) DC voltage: 0 V to 24 V Accuracy: ±0.0013 %...

  • Page 32: Performance Tests

    Table 6. Unless otherwise indicated, all connection diagrams for the verification tests in this manual showing a calibrator or digital multimeter use a Fluke 5520A Calibrator or Fluke 8508A DMM. If you are using a different DMM, make the connections appropriate for your instrument.

  • Page 33: Upper Display Voltage Measurement Tests

    5. Press STBY on the 5520A. aal03f.eps Figure 2. Upper Display Voltage Test Connections Table 7. Upper Display Voltage Readings 5520A Outputs 724/725 UUT Readings 726 UUT Readings 0.000 V -0.002 V to +0.002 V -0.002 V to +0.002 V 15.000 V...

  • Page 34: Lower Display Mv/Tc Measurement Tests

    5. Press STBY on the 5520A. aal04f.eps Figure 3. Lower Display mV and Voltage Test Connections Table 8. Lower Display mV Readings 5520A Outputs 724/725 UUT Readings 726 UUT Readings 0.00 mV -0.02 mV to +0.02 mV -0.0100 mV to +0.010 mV 44.97 mV to 45.03 mV...

  • Page 35: Lower Display Voltage Measurement Tests

    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. 5. Press STBY on the 5520A. Table 9. Lower Display Voltage Readings 5520A Outputs 724/725 UTT Readings 726 UTT Readings 0.000 V -0.002 V to +0.002 V -0.002 V to +0.002 V 10.000 V...

  • Page 36: Upper Display Ma Measurement Tests

    5. Press STBY on the 5520A. aal05f.eps Figure 4. Upper Display mA Test Connections Table 10. Upper Display mA Readings 5520A Settings 724/725 UUT Readings 726 UUT Readings 4.000 mA 3.997 mA to 4.003 mA 3.997 mA to 4.003 mA 12.000 mA...

  • Page 37: Lower Display Ma Measurement Tests (725 And 726)

    5. Press STBY on the 5520A. aal06f.eps Figure 5. Lower Display mA Test Connections Table 11. Lower Display mA Readings 5520A Outputs 724/725 UUT Readings 726 UUT Readings 4.000 mA 3.997 mA to 4.003 mA 3.997 mA to 4.003 mA 12.000 mA...

  • Page 38: Lower Display Frequency Measurement Test (725 And 726)

    724/725/726 Calibration Manual Lower Display Frequency Measurement Test (725 and 726) 1. Set the 5520A to source a 10 kHz, 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 (Kfor 726) until MEASURE and kHz appear on the lower display.

  • Page 39: Lower Display Frequency Source Test (725 And 726)

    1. Press M on the UUT until SOURCE appears on the lower display. 2. Press F on the UUT (Kfor 726) until Hz appears on the lower display. 3. Configure the Fluke 8508A to measure frequency; then make the connections shown in Figure 7.

  • Page 40: Lower Display 4-Wire Resistance Measurement Tests

    4. Press STBY on the 5520A. aal09f.eps Figure 8. Lower Display 4-Wire Resistance Test Connections Table 12. Lower Display 4-Wire Resistance Readings 5520A Outputs 724/725 UUT Readings 726 UUT Readings 15.00 Ω 14.90 Ω to 15.10 Ω 14.94 Ω to 15.06 Ω...

  • Page 41: Lower Display 3-Wire Rtd Measurement

    Calibrators Performance Tests Lower Display 3-Wire RTD Measurement 1. Press F on the UUT (R on the 726) until Ω appears on the lower display. If necessary, use M to select the measure mode, and use X (R on the 726) to get to the 3W mode.

  • Page 42: Lower Display Thermocouple Measurement Tests

    4. Press STBY on the 5520A. aal11f.eps Figure 10. Lower Display Thermocouple Test Connections Table 13. Type-J Thermocouple Readings 5520A Settings 724/725 UUT Readings 726 UUT Readings (CJC On) (referenced to 0 °C) 0.0 °C (0.000 mV) -0.7 °C to +0.7 °C...

  • Page 43: Lower Display Thermocouple Source Test

    3. Use the arrow keys to set the UUT outputs to the temperatures in Table 14 and verify that the 5520A temperature readings are within the limits shown. 4. Press STBY on the 5520A. Remove the TC lead from the 5520A and the UUT. Table 14. Lower Display Thermocouple Source Readings 724/725 UUT Settings Readings 5520A Readings (referenced to 0 °C)

  • Page 44: Lower Display Ma Source Tests (725 And 726)

    2. Set the Fluke 8508A to measure dc current. 3. Connect the UUT and the Fluke 8508A as shown in Figure 11. 4. Use the arrow keys on the UUT to set the UUT to the currents in Table 15 and verify that the Fluke 8508A readings are within the limits shown.

  • Page 45: Lower Display Mv Source Tests

    4. Use the arrow keys on the UUT to set the UUT outputs to the currents in Table 17 and verify that the Fluke 8508A readings are within the limits shown. You can use a lower voltage range on the Fluke 8508A to verify the 0 V range.

  • Page 46: Lower Display Ohms Source Tests

    M until SOURCE appears on the lower display. 2. Set the Fluke 8508A to measure 4-wire resistance. 3. Set the Fluke 8508A to 2 k range for 72x resistance < 400 Ω, to 20 kΩ range for 400 Ω or more.

  • Page 47: Pressure Module Input (725/726)

    Calibration Adjustment Pressure Module Input (725/726) 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 48: Initiating Communication (724 And 725)

    You must first calibrate mV Input and mV Output before calibrating thermocouples for the 724, 725, and 726. At the end of each step on the calibration menu, the new calibration constants for that step are saved, but not actually used until power is recycled.

  • Page 49: Calibration Adjustment Procedures (724 And 725)

    Enter 0 Volts - press “ the proper key” 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 50: Cal Volts Output

    Zero into DAC. Enter the Volts displayed : Set the Fluke 8508A to read V DC. When the reading on the 8508A has stabilized, enter the value in volts on the PC, and press Enter. You only need to enter four places past the decimal point and do not need to enter the units (V).

  • Page 51: 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 52: Cal Ma Output (725 Only)

    PC: Max value into DAC. Enter mA value displayed : Enter the current reading from the Fluke 8508A in the PC, then press Enter. After a short while, the following calibration constants and new prompt are displayed on the PC: -1.628906...

  • Page 53: 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 54: Cal Mv Output

    Zero into DAC. Enter mV displayed : Set the Fluke 8508A to read V DC. When the reading on the Fluke 8508A has stabilized, enter the value in millivolts on the PC, then press Enter. You only need to enter four places past the decimal point and do not need to enter the units (mV).

  • Page 55: Cal Thermocouples

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

  • Page 56: Cal Ohms Hi Source

    2500 into DAC. Enter Ohms displayed : Set the Fluke 8508A to read 4-terminal Ohms. When the reading on the Fluke 8508A has stabilized, enter the value in Ohms on the PC, then press Enter. After a short while, the PC displays: Max value into DAC.

  • Page 57: Cal Ohms Low Source

    2500 into DAC. Enter Ohms displayed : Set the Fluke 8508A to read 4 terminal Ohms. When the reading on the Fluke 8508A has stabilized, enter the value in Ohms on the PC, then press Enter. After a short while, the PC displays: Max value into DAC.

  • Page 58: 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 59: 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 60: 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 61: 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 62: Calibration Adjustment Procedures (726)

    724/725/726 Calibration Manual Calibration Adjustment Procedures (726) Note This procedure does not cover the verification of the unit. The Calibrator should never use up more than 50 % of its specifications immediately after calibration. When calibrating the 726, you can also exit and enter calibration mode while performing the verification, subject to the dependencies listed in the procedure.

  • Page 63: Calibrating Isolated Ma Input

    Calibrators Calibration Adjustment Calibrating Isolated mA Input Connect the UUT as shown in Figure 24. aal05f.eps Figure 24. Isolated mA Input Calibration Connections After the proper connections have been made, type “1” (the first calibration step) then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: Input 0 mA, Press Enter When Stable...

  • Page 64: Calibrating Isolated Voltage Input

    724/725/726 Calibration Manual Calibrating Isolated Voltage Input Connect the UUT as shown in Figure 25. aal03f.eps Figure 25. Isolated Voltage Input Calibration Connections After making the proper connections, type “2” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu:...

  • Page 65: Calibrating Ma Input

    Calibrators Calibration Adjustment Calibrating mA Input Connect the UUT as shown in Figure 26. aal06f.eps Figure 26. mA Input Calibration Connections After making the proper connections, type “3” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: Input 0 mA, Press Enter When Stable Input 24 mA, Press Enter When Stable...

  • Page 66: Calibrating Ma Output

    724/725/726 Calibration Manual Calibrating mA Output Connect the UUT as shown in Figure 27. aal12f.eps Figure 27. mA Output Calibration Connections After making the proper connections, type “4” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: First Calibration Point.

  • Page 67: Calibrating Voltage Input

    Calibrators Calibration Adjustment Calibrating Voltage Input Connect the UUT as shown in Figure 28. aal04.eps Figure 28. Voltage Input Calibration Connections After making the proper connections, type “5” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: Input 0 Volts, Press Enter When Stable Input 20 Volts, Press Enter When Stable...

  • Page 68: Calibrating Voltage Output

    724/725/726 Calibration Manual Calibrating Voltage Output Connect the UUT as shown in Figure 29. aal08f.eps Figure 29. Voltage Output Calibration Connections After making the proper connections, type “6” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: First Calibration Point.

  • Page 69: Calibrating Low Ohms Source

    Calibrators Calibration Adjustment Calibrating Low Ohms Source Connect the UUT as shown in Figure 30. aal13f.eps Figure 30. Low Ohms Source Calibration Connections After making the proper connections, type “7” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: First Calibration Point.

  • Page 70: Calibrating High Ohms Source

    724/725/726 Calibration Manual Calibrating High Ohms Source Connect the UUT as shown in Figure 31. aal13f.eps Figure 31. High Ohms Source Calibration Connections After making the proper connections, type “8” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: First Calibration Point.

  • Page 71: Calibrating Ohms Measure

    Calibrators Calibration Adjustment Calibrating Ohms Measure Connect the UUT as shown in Figure 32. aal09f.eps Figure 32. Ohms Measure Calibration Connections After making the proper connections, type “9” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: Input 15 Ohms, Press Enter When Stable Input 400 Ohms, Press Enter When Stable...

  • Page 72: Calibrating Thermocouple Mv Output

    724/725/726 Calibration Manual Calibrating Thermocouple mV Output Connect the UUT as shown in Figure 33. aal08f.eps Figure 33. Thermocouple mV Output Calibration Connections After making the proper connections, type “10” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: First Calibration Point.

  • Page 73: Calibrating Thermocouple Mv Input

    Calibrators Calibration Adjustment Calibrating Thermocouple mV Input Connect the UUT as shown in Figure 34. aal11f.eps Figure 34. Thermocouple mV Input Calibration Connections After making the proper connections, type “11” then press the Enter key on the PC keyboard. Input directions are displayed at the bottom of the calibration menu: Enter Selection: Input –10mV, Press Enter When Stable Input 90mV, Press Enter When Stable...

  • Page 74: Calibrating Thermocouple Cjc

    724/725/726 Calibration Manual Calibrating Thermocouple CJC: Connect the UUT as shown in Figure 35. For the lag bath setup, see Figure 36. aal11f.eps Figure 35. Thermocouple CJC Calibration Connections The calibration of the TC CJC (Cold Junction Compensation) is a critical part of the calibration process, it is important that the thermocouple junction be allowed to completely stabilize.

  • Page 75: Replaceable Parts

    802063 724 Input/output bracket 1549921 725 - 726 Input/output bracket 691391 LCD bracket 658390 Mounting screws 494641 Backlight 690336 724 - 725 LCD 690963 724 Keypad 1548126 725 Keypad 690955 726 Keypad 2461532 Case bottom 664235 AA alkaline batteries 376756...
  • Page 76 Item Description Fluke No. Quantity 724 Product Overview Manual 1547851 725 Product Overview Manual 1549644 726 Product Overview Manual 2441588 724 CD-ROM (contains Users Manual) 1547849 725/726 CD-ROM (contains Users 1549615 Manual) 700SC serial interface cable 667425 Optional Shown accessory aal02f.eps...

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