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Fluke 7526A-156 Calibration Manual

Temperature, pressure and low dc voltage precision process calibrator
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
7526A
Precision Process Calibrator
Calibration Manual
March 2013
© 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.

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  • Page 1 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 TestEquipmentDepot.com 7526A Precision Process Calibrator Calibration Manual March 2013 © 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.

  • Page 3: Table Of Contents

    Table of Contents Title Page Introduction ......................1 Contact Fluke Calibration .................. 1 Safety Information ..................... 2 Specifications ..................... 4 Resistance Specifications, Output ..............6 RTD and Thermistor Specification, Output ..........8 Maintenance ....................... 10 Clean the Product ..................10 Replace a Line Fuse ..................
  • Page 4 7526A Calibration Manual Step 17: 100 V Read Adjustment ..............33 User-Replaceable Parts ..................34 Accessories ......................36...
  • Page 5 List of Tables Table Title Page Symbols ........................3 Replacement Fuses ....................10 Required Equipment ....................12 DC Voltage Verification ..................13 DC Current Verification ..................14 TC mV Test ......................15 Ohms Output Ranges ..................... 18 Ohms Ratio Table ....................20 Isolated DC Voltage ....................
  • Page 6 7526A Calibration Manual...
  • Page 7 List of Figures Figure Title Page Replace the Line Fuse .................... 11 DC Current Performance Test Connections ............14 Thermocouple Output Performance Test Connections .......... 15 CJC Performance Test Connections ............... 16 TC Input Performance Test Connections ............... 17 Resistance Output Performance Test Connections ..........18 Ohms Input Performance Test Connections ............
  • Page 8 7526A Calibration Manual...

  • Page 9: Introduction

    Introduction Warning To prevent possible electrical shock, fire, or personal injury, read all safety information before you use the Product. This manual contains the verification and calibration adjustment procedures for the 7526A Precision Process Calibrator (the Product). Please see the 7526A Users Manual for usage information.

  • Page 10: Safety Information

    7526A Calibration Manual Safety Information A Warning identifies conditions and procedures that are dangerous to the user. A Caution identifies conditions and procedures that can cause damage to the Product or the equipment under test. Warnings To prevent possible electrical shock, fire, or personal injury: •...
  • Page 11 WEEE Directive Annex I, this product is classed as category 9 "Monitoring and Control Instrumentation” product. Do not dispose of this product as unsorted municipal waste. Go to Fluke’s website for recycling information. Hazardous voltage. Risk of electric  ...

  • Page 12: Specifications

    7526A Calibration Manual Specifications General Specifications Warm-up Time ........Twice the time since last warmed up, to a maximum of 30 minutes Settling Time ......... Less than 5 seconds for all functions and ranges except as noted Standard Interfaces ......RS-232 IEEE-488 (GPIB) Temperature Performance Operating ........
  • Page 13 Precision Process Calibrator Specifications DC Voltage Specifications, Output Absolute Uncertainty, tcal ±5°C, Stability ±(ppm of output +µV) Maximum Ranges Resolution 24 hours, ±1 °C Burden 90 Days 1 Year ±(ppm of output +μV) 5 ppm + 2 μV 1 μV 0 mV to 100.000 mV 10 mA 4 ppm + 10 μV...

  • Page 14: Resistance Specifications, Output

    7526A Calibration Manual Resistance Specifications, Output Absolute Uncertainty, tcal ±5 °C, ± Ohms Ranges Resolution Nominal Current 90 Days 1 Year 5 Ω to 400.000 Ω 0.012 0.015 0.001 Ω 1 to 3 mA 5 Ω to 4.00000 kΩ 0.25 0.01 Ω...
  • Page 15 Precision Process Calibrator Specifications Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (°C) TC Type Output/Input Minimum Maximum 90 days 1 Year -50 °C -25 °C 0.54 °C 0.55 °C -25 °C 0 °C 0.44 °C 0.45 °C 0 °C 100 °C 0.38 °C 0.39 °C 100 °C...

  • Page 16: Rtd And Thermistor Specification, Output

    7526A Calibration Manual RTD and Thermistor Specification, Output Range °C Absolute Uncertainty, tcal ±5 °C ±(°C) RTD Types Minimum Maximum 90 Days 1 Year Pt 385, 100 Ω -200 °C 800 °C 0.04 °C 0.05 °C Pt 3926, 100 Ω -200 °C 630 °C 0.04 °C...
  • Page 17 Based on MINCO Application Aid No. 18. Pressure Measurement Specifications The Calibrator can accept the Fluke 700 or 525A-P Series pressure modules. Pressure modules connect directly into the front panel Lemo connector with the Calibrator firmware auto-detecting the type and value of the module you connect.

  • Page 18: Maintenance

    7526A Calibration Manual Maintenance This section explains typical maintenance and tasks necessary to keep the Product in service. Warnings To prevent possible electrical shock, fire, or personal injury: • Have an approved technician repair the Product. • Disconnect the mains power cord before you remove the Product covers.

  • Page 19: Change The Line Voltage

    Precision Process Calibrator Maintenance Changing Line Fuse gxm009.eps Figure 1. Replace the Line Fuse Change the Line Voltage The Product comes from the factory configured for the line voltage applicable for the country of purchase, or as specified when it is ordered. To verify the line voltage setting, examine the line voltage indicator on the power line fuse compartment cover.

  • Page 20: Performance Tests

    DC volts, dc current, resistance Thermistor probe Fluke5640-D TC CJC calibration Omega E-type thermocouple Thermocouple probe TC CJC calibration probe Pressure Module Any Fluke 700 Series Module Pressure Lead Set 5520A-525A/LEADS Leads Kit Necessary test cables Precision Thermistor Fluke 5640-D Temperature Thermometer Readout...

  • Page 21: Dc Voltage

    Precision Process Calibrator Performance Tests DC Voltage The dc voltage performance test verifies the accuracy of the Volts Source output from the front panel of the Product. Verify the measurements shown in Table 4 with a digital multimeter (DMM). Table 4. DC Voltage Verification 90-Day 1-Year Range...

  • Page 22: Dc Current

    7526A Calibration Manual DC Current The dc current performance test verifies the accuracy of the current output from the front panel of the Product. Use the 8508A and the precision shunt to measure the Product output. Divide the voltage indication from the 8508A by the 742A-1 actual value to determine the current output.

  • Page 23: Thermocouple Output

    Precision Process Calibrator Performance Tests Thermocouple Output The thermocouple (TC) output performance test verifies the accuracy of the TC output on the front panel of the Product. Thermocouple mV specifications will be used for this test. When this test is combined with the cold junction compensation (CJC) test, all functions of the TC output are checked.

  • Page 24: Cjc (Cold Junction Compensation)

    7526A Calibration Manual CJC (Cold Junction Compensation) The CJC performance test verifies the accuracy of the cold junction compensation of the Product. Connect a Type-E thermocouple to the TC terminals on the Product. Immerse the thermocouple and a precision thermometer in a mineral oil lag bath. See Figure 4 for connections.

  • Page 25: Thermocouple Input

    Precision Process Calibrator Performance Tests Thermocouple Input The TC input performance test verifies the accuracy of the TC input. Push  and then  on the Product to set the Product to TC input. All Product conditions will be the same as the Thermocouple Output test mode (CJC off, mV/ °C).

  • Page 26: Ohms Output

    7526A Calibration Manual Ohms Output The ohms output performance test verifies the accuracy of the ohms output from the front of the Product. Use the DMM to measure the ohms output. Apply the values shown in Table 7. See Figure 6 for connections. Note Make sure the sense wires from the 8508A are on the bottom of the stackable leads.

  • Page 27: Ohms Input

    Precision Process Calibrator Performance Tests Ohms Input The ohms input performance test verifies the ohms input on the front of the Product. Before an ohms input is measured, the ohms output of a 5522A must be “characterized”. To get the necessary accuracy, the 8508A is used as a transfer standard and the 742A is used as the reference standard.
  • Page 28 7526A Calibration Manual Use the 742A-1K for the 400 Ω range. Use the 742A-10K for the 4 KΩ range. For more information about how to use the ratio mode, see the 8508A Operators Manual. Note the ratio indication on the 8508A in Table 8. Use the formula: (742A actual value/ratio indication x 100 = actual 5522A actual value).
  • Page 29 Precision Process Calibrator Performance Tests To test the ohm input: 1. Apply a four-wire short to the Product 4W RTD/Ω input. 2. For the first test, set the Product to the 400 Ω range. 3. For the second test, connect the Product 4W RTD/Ω input to the output of the 5522A as shown in Figure 8.

  • Page 30: Pressure Modules

    The Fluke 700 and 525A-P series pressure modules are calibrated separately from the Product. Only a performance test is necessary. Connect any of the Fluke 700 and 525A-P series pressure modules to the pressure module connector. Make sure that the Product reads pressure.

  • Page 31: Isolated Dc Voltage

    Precision Process Calibrator Performance Tests Isolated DC Voltage The isolated dc voltage performance test verifies the accuracy of the isolated dc voltage source output from the front panel of the Product. Connect the 5522A Normal HI and LO to the Product Isolated input HI and LO jacks located on the right side of the Product. Verify the measurements listed in Table 9.

  • Page 32: Isolated Dc Current

    7526A Calibration Manual Isolated DC Current The isolated dc current performance test verifies the accuracy of the isolated dc current source output from the front panel of the Product. Connect 5522A Normal HI to the Product Isolated Input LO. Connect the Product Isolated input HI to 8508A input A. Connect 8508A Input LO to 5522A Normal LO.

  • Page 33: Calibration Adjustment

    Precision Process Calibrator Calibration Adjustment Calibration Adjustment The Product features electronic calibration adjustment. There are no mechanical adjustments. Calibration adjustment is done with the case closed through the serial communications port that sends and receives commands and readings with a RS232 interface.

  • Page 34: Adjustment Sequence

    Enter Selection: Adjustment Sequence Calibration adjustment is a menu-driven process. Fluke Calibration recommends that calibration be done in the order specified by the menu. However, each step is independent and can be performed separately if necessary, with the exception of the TC function. The TC calibration adjustment must be done in the order shown in the menu (steps 1-18).

  • Page 35: Step 5: 100 Ma Source - Dc Current Source Adjustment

    Precision Process Calibrator Calibration Adjustment 7526A 8508A 7526A PRECISION PROCESS CALIBRATOR VOLTS RTD/ 100 mA MAX OUTPUT OUTPUT 100 V MAX 20V PK 4 W RTD/ INPUT CURRENT SENSE 20 V PK gxm020.eps Figure 12. DC Volts Source Performance Test Connections Enter 2 on the PC to choose the 1 V source calibration.

  • Page 36: Steps 6 And 7: Hi Ohms Source And Low Ohms Source Adjustment

    7526A Calibration Manual Enter 5 on the PC. The calibration procedure for current output is similar to voltage output except there is only one range and the voltage is measured across a 10 Ω shunt resistor instead of a direct current measurement. Readings from the DMM must be converted to mA (multiplied by 100) before they can be entered on the PC.

  • Page 37: Steps 8 Through 11: 100 Ohms Measure, Resistance Measure Adjustment

    1000 Ω • 2000 Ω • 4000 Ω The subsequent procedure uses the Fluke 5522 for ohms source to adjust the Product reading. See Table 3 for the test equipment used for this procedure. See Figure 15 for connections. 7526A Calibrator...

  • Page 38: Step 12: Tc Source, Tc Mv Source Adjustment

    7526A Calibration Manual This adjustment procedure requests approximately: • 1000 Ω • 2000 Ω • 4000 Ω The actual value used must be entered. 1. For the 0 Ω connection, connect a short to the 4 terminals for 4W RTD/Ω. 2.

  • Page 39: Step 13: Tc Read, Tc Mv Measure Adjustment

    Precision Process Calibrator Calibration Adjustment Step 13: TC Read, TC mV Measure Adjustment The adjustment of the TC source output range is similar to the first part of the voltage source calibration. The Product outputs two adjustment points. After the output becomes stable, the values can be entered at the PC.

  • Page 40: Step 16: 10 V Read Adjustment

    7526A Calibration Manual 5522A 7526A 5522A CALIBRATOR VOLTS/mA LOOP HART SW TEST STBY Press for Switch Test VOLTS/mA Reset Press and Hold for Switch Test INPUT 20 V PK 8508A 742A gxm026.eps Figure 16. mA Read Adjustment Connections Enter 15 at the PC. Source five calibration points from the 5522A: •...
  • Page 41 Precision Process Calibrator Calibration Adjustment 7526A Calibrator 5522A CALIBRATOR VOLTS/mA LOOP HART SW TEST Press for Switch Test VOLTS/mA Reset Press and Hold for Switch Test INPUT 100 V PK 8508A gxm022.eps Figure 17. 10 V Read Adjustment Connections Step 17: 100 V Read Adjustment Use the test equipment shown in Table 3.
  • Page 42 7526A Calibration Manual User-Replaceable Parts User-replaceable parts are listed in Table 11 and shown in Figure 18. To get parts and accessories, see the “Contact Fluke Calibration” section. Table 11. User-Replaceable Parts Item Fluke Part Number Description Quantity Number ...
  • Page 43 Precision Process Calibrator User-Replaceable Parts 3 2x 9 4x 12 13 gxm027.eps Figure 18. User-Replaceable Parts...
  • Page 44 Accessories for the product are shown in Table 12. To get parts and accessories, see the “Contact Fluke Calibration” section. Table 12. Accessories Fluke Part Number Description 1622027 Fluke Y7526A Rack Mount Kit 946470 RS43, RS232 Null Modem Cable 7526A-CASE Carrying Case 1618621...

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