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Summary of Contents for Fluke 7526A
- Page 1 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 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.
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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...
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Page 9: Introduction
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. The Product is an accurate, full-featured temperature, pressure, and dc calibrator. It is meant for research and development, manufacturing, and calibration laboratory procedures. -
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: Symbols
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... - 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...
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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...
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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... - 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.
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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
3.45 μV 15.000 mV 3.750 μV 3.90 μV 35.000 mv 4.250 μV 4.50 μV 55.000 mV 4.750 μV 5.10 μV 75.000 mV 7526A 8508A 7526A PRECISION PROCESS CALIBRATOR VOLTS RTD/ 100 mA MAX OUTPUT OUTPUT 100 V MAX INPUT/OUTPUT 20V PK... -
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
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). Set the 5522A to the mV values listed in Table 6. See Figure 5 for connections. 7526A Calibrator 5522A... -
Page 26: Ohms Output
Push to select the 400 Ω, then the 4000 Ω range. Note Ω The 8508A should be set to the 2 k range when you measure the 7526A Ω Ω range. After the 1000 measurement, the 8508A should be set to the Ω... -
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: Ohms Ratio Table
8508A in Table 8. Use the formula: (742A actual value/ratio indication x 100 = actual 5522A actual value). Start with the 7526A in the 400 Ω range. After the 400 Ω test, change the 7526A to the 4000 Ω range. - Page 29 Table 8. 6. Output the same nominal values and note the Product indication in the 7526A Reading column of Table 8. 7. Subtract the 5522A Actual Value from the 7526A Reading and ensure that it is within the specified tolerance. 7526A...
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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
0.0007 V 0.002 V 25 V 0.003 V 100.0 V 50 V 0.005 V 75 V 0.006 V 100 V 0.007 V Calibrator 7526A 5522A CALIBRATOR VOLTS/mA LOOP HART SW TEST Press for Switch Test VOLTS/mA Reset Press and Hold... -
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. -
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. -
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
Push ENTER on the PC when stable to go to the next calibration point. Step 16: 10 V Read Adjustment Connect 5522A V source jacks to 7526A isolated jacks. Use the 8508A DMM to monitor the voltage. Enter 16 on the PC. Source three 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.
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Page 42: User-Replaceable Parts
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...
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Page 44: Accessories
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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